/************************************************* * Perl-Compatible Regular Expressions * *************************************************/ /* This is a library of functions to support regular expressions whose syntax and semantics are as close as possible to those of the Perl 5 language. See the file Tech.Notes for some information on the internals. Written by: Philip Hazel Copyright (c) 1997-2003 University of Cambridge ----------------------------------------------------------------------------- Permission is granted to anyone to use this software for any purpose on any computer system, and to redistribute it freely, subject to the following restrictions: 1. This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 2. The origin of this software must not be misrepresented, either by explicit claim or by omission. 3. Altered versions must be plainly marked as such, and must not be misrepresented as being the original software. 4. If PCRE is embedded in any software that is released under the GNU General Purpose Licence (GPL), then the terms of that licence shall supersede any condition above with which it is incompatible. ----------------------------------------------------------------------------- */ /* Define DEBUG to get debugging output on stdout. */ /* #define DEBUG */ /* Use a macro for debugging printing, 'cause that eliminates the use of #ifdef inline, and there are *still* stupid compilers about that don't like indented pre-processor statements. I suppose it's only been 10 years... */ #ifdef DEBUG #define DPRINTF(p) printf p #else #define DPRINTF(p) /*nothing*/ #endif /* Include the internals header, which itself includes Standard C headers plus the external pcre header. */ #include "internal.h" /* Allow compilation as C++ source code, should anybody want to do that. */ #ifdef __cplusplus #define class pcre_class #endif /* Maximum number of items on the nested bracket stacks at compile time. This applies to the nesting of all kinds of parentheses. It does not limit un-nested, non-capturing parentheses. This number can be made bigger if necessary - it is used to dimension one int and one unsigned char vector at compile time. */ #define BRASTACK_SIZE 200 /* Maximum number of ints of offset to save on the stack for recursive calls. If the offset vector is bigger, malloc is used. This should be a multiple of 3, because the offset vector is always a multiple of 3 long. */ #define REC_STACK_SAVE_MAX 30 /* The number of bytes in a literal character string above which we can't add any more is set at 250 in order to allow for UTF-8 characters. (In theory it could be 255 when UTF-8 support is excluded, but that means that some of the test output would be different, which just complicates things.) */ #define MAXLIT 250 /* The maximum remaining length of subject we are prepared to search for a req_byte match. */ #define REQ_BYTE_MAX 1000 /* Table of sizes for the fixed-length opcodes. It's defined in a macro so that the definition is next to the definition of the opcodes in internal.h. */ static uschar OP_lengths[] = { OP_LENGTHS }; /* Min and max values for the common repeats; for the maxima, 0 => infinity */ static const char rep_min[] = { 0, 0, 1, 1, 0, 0 }; static const char rep_max[] = { 0, 0, 0, 0, 1, 1 }; /* Table for handling escaped characters in the range '0'-'z'. Positive returns are simple data values; negative values are for special things like \d and so on. Zero means further processing is needed (for things like \x), or the escape is invalid. */ static const short int escapes[] = { 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - 7 */ 0, 0, ':', ';', '<', '=', '>', '?', /* 8 - ? */ '@', -ESC_A, -ESC_B, -ESC_C, -ESC_D, -ESC_E, 0, -ESC_G, /* @ - G */ 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */ 0, -ESC_Q, 0, -ESC_S, 0, 0, 0, -ESC_W, /* P - W */ 0, 0, -ESC_Z, '[', '\\', ']', '^', '_', /* X - _ */ '`', 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0, /* ` - g */ 0, 0, 0, 0, 0, 0, ESC_n, 0, /* h - o */ 0, 0, ESC_r, -ESC_s, ESC_t, 0, 0, -ESC_w, /* p - w */ 0, 0, -ESC_z /* x - z */ }; /* Tables of names of POSIX character classes and their lengths. The list is terminated by a zero length entry. The first three must be alpha, upper, lower, as this is assumed for handling case independence. */ static const char *posix_names[] = { "alpha", "lower", "upper", "alnum", "ascii", "blank", "cntrl", "digit", "graph", "print", "punct", "space", "word", "xdigit" }; static const uschar posix_name_lengths[] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 }; /* Table of class bit maps for each POSIX class; up to three may be combined to form the class. The table for [:blank:] is dynamically modified to remove the vertical space characters. */ static const int posix_class_maps[] = { cbit_lower, cbit_upper, -1, /* alpha */ cbit_lower, -1, -1, /* lower */ cbit_upper, -1, -1, /* upper */ cbit_digit, cbit_lower, cbit_upper, /* alnum */ cbit_print, cbit_cntrl, -1, /* ascii */ cbit_space, -1, -1, /* blank - a GNU extension */ cbit_cntrl, -1, -1, /* cntrl */ cbit_digit, -1, -1, /* digit */ cbit_graph, -1, -1, /* graph */ cbit_print, -1, -1, /* print */ cbit_punct, -1, -1, /* punct */ cbit_space, -1, -1, /* space */ cbit_word, -1, -1, /* word - a Perl extension */ cbit_xdigit,-1, -1 /* xdigit */ }; /* Definition to allow mutual recursion */ static BOOL compile_regex(int, int, int *, uschar **, const uschar **, const char **, BOOL, int, int *, int *, branch_chain *, compile_data *); /* Structure for building a chain of data that actually lives on the stack, for holding the values of the subject pointer at the start of each subpattern, so as to detect when an empty string has been matched by a subpattern - to break infinite loops. */ typedef struct eptrblock { struct eptrblock *prev; const uschar *saved_eptr; } eptrblock; /* Flag bits for the match() function */ #define match_condassert 0x01 /* Called to check a condition assertion */ #define match_isgroup 0x02 /* Set if start of bracketed group */ /* Non-error returns from the match() function. Error returns are externally defined PCRE_ERROR_xxx codes, which are all negative. */ #define MATCH_MATCH 1 #define MATCH_NOMATCH 0 /************************************************* * Global variables * *************************************************/ /* PCRE is thread-clean and doesn't use any global variables in the normal sense. However, it calls memory allocation and free functions via the two indirections below, and it can optionally do callouts. These values can be changed by the caller, but are shared between all threads. However, when compiling for Virtual Pascal, things are done differently (see pcre.in). */ #ifndef VPCOMPAT void *(*pcre_malloc)(size_t) = malloc; void (*pcre_free)(void *) = free; int (*pcre_callout)(pcre_callout_block *) = NULL; #endif /************************************************* * Macros and tables for character handling * *************************************************/ /* When UTF-8 encoding is being used, a character is no longer just a single byte. The macros for character handling generate simple sequences when used in byte-mode, and more complicated ones for UTF-8 characters. */ #ifndef SUPPORT_UTF8 #define GETCHAR(c, eptr) c = *eptr; #define GETCHARINC(c, eptr) c = *eptr++; #define GETCHARINCTEST(c, eptr) c = *eptr++; #define GETCHARLEN(c, eptr, len) c = *eptr; #define BACKCHAR(eptr) #else /* SUPPORT_UTF8 */ /* Get the next UTF-8 character, not advancing the pointer. This is called when we know we are in UTF-8 mode. */ #define GETCHAR(c, eptr) \ c = *eptr; \ if ((c & 0xc0) == 0xc0) \ { \ int gcii; \ int gcaa = utf8_table4[c & 0x3f]; /* Number of additional bytes */ \ int gcss = 6*gcaa; \ c = (c & utf8_table3[gcaa]) << gcss; \ for (gcii = 1; gcii <= gcaa; gcii++) \ { \ gcss -= 6; \ c |= (eptr[gcii] & 0x3f) << gcss; \ } \ } /* Get the next UTF-8 character, advancing the pointer. This is called when we know we are in UTF-8 mode. */ #define GETCHARINC(c, eptr) \ c = *eptr++; \ if ((c & 0xc0) == 0xc0) \ { \ int gcaa = utf8_table4[c & 0x3f]; /* Number of additional bytes */ \ int gcss = 6*gcaa; \ c = (c & utf8_table3[gcaa]) << gcss; \ while (gcaa-- > 0) \ { \ gcss -= 6; \ c |= (*eptr++ & 0x3f) << gcss; \ } \ } /* Get the next character, testing for UTF-8 mode, and advancing the pointer */ #define GETCHARINCTEST(c, eptr) \ c = *eptr++; \ if (md->utf8 && (c & 0xc0) == 0xc0) \ { \ int gcaa = utf8_table4[c & 0x3f]; /* Number of additional bytes */ \ int gcss = 6*gcaa; \ c = (c & utf8_table3[gcaa]) << gcss; \ while (gcaa-- > 0) \ { \ gcss -= 6; \ c |= (*eptr++ & 0x3f) << gcss; \ } \ } /* Get the next UTF-8 character, not advancing the pointer, incrementing length if there are extra bytes. This is called when we know we are in UTF-8 mode. */ #define GETCHARLEN(c, eptr, len) \ c = *eptr; \ if ((c & 0xc0) == 0xc0) \ { \ int gcii; \ int gcaa = utf8_table4[c & 0x3f]; /* Number of additional bytes */ \ int gcss = 6*gcaa; \ c = (c & utf8_table3[gcaa]) << gcss; \ for (gcii = 1; gcii <= gcaa; gcii++) \ { \ gcss -= 6; \ c |= (eptr[gcii] & 0x3f) << gcss; \ } \ len += gcaa; \ } /* If the pointer is not at the start of a character, move it back until it is. Called only in UTF-8 mode. */ #define BACKCHAR(eptr) while ((*eptr & 0xc0) == 0x80) eptr--; #endif /************************************************* * Default character tables * *************************************************/ /* A default set of character tables is included in the PCRE binary. Its source is built by the maketables auxiliary program, which uses the default C ctypes functions, and put in the file chartables.c. These tables are used by PCRE whenever the caller of pcre_compile() does not provide an alternate set of tables. */ #include "chartables.h" #ifdef SUPPORT_UTF8 /************************************************* * Tables for UTF-8 support * *************************************************/ /* These are the breakpoints for different numbers of bytes in a UTF-8 character. */ static int utf8_table1[] = { 0x7f, 0x7ff, 0xffff, 0x1fffff, 0x3ffffff, 0x7fffffff}; /* These are the indicator bits and the mask for the data bits to set in the first byte of a character, indexed by the number of additional bytes. */ static int utf8_table2[] = { 0, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc}; static int utf8_table3[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01}; /* Table of the number of extra characters, indexed by the first character masked with 0x3f. The highest number for a valid UTF-8 character is in fact 0x3d. */ static uschar utf8_table4[] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; /************************************************* * Convert character value to UTF-8 * *************************************************/ /* This function takes an integer value in the range 0 - 0x7fffffff and encodes it as a UTF-8 character in 0 to 6 bytes. Arguments: cvalue the character value buffer pointer to buffer for result - at least 6 bytes long Returns: number of characters placed in the buffer */ static int ord2utf8(int cvalue, uschar *buffer) { register int i, j; for (i = 0; i < sizeof(utf8_table1)/sizeof(int); i++) if (cvalue <= utf8_table1[i]) break; buffer += i; for (j = i; j > 0; j--) { *buffer-- = 0x80 | (cvalue & 0x3f); cvalue >>= 6; } *buffer = utf8_table2[i] | cvalue; return i + 1; } #endif /************************************************* * Print compiled regex * *************************************************/ /* The code for doing this is held in a separate file that is also included in pcretest.c. It defines a function called print_internals(). */ #ifdef DEBUG #include "printint.c" #endif /************************************************* * Return version string * *************************************************/ #define STRING(a) # a #define XSTRING(s) STRING(s) const char * pcre_version(void) { return XSTRING(PCRE_MAJOR) "." XSTRING(PCRE_MINOR) " " XSTRING(PCRE_DATE); } /************************************************* * (Obsolete) Return info about compiled pattern * *************************************************/ /* This is the original "info" function. It picks potentially useful data out of the private structure, but its interface was too rigid. It remains for backwards compatibility. The public options are passed back in an int - though the re->options field has been expanded to a long int, all the public options at the low end of it, and so even on 16-bit systems this will still be OK. Therefore, I haven't changed the API for pcre_info(). Arguments: external_re points to compiled code optptr where to pass back the options first_byte where to pass back the first character, or -1 if multiline and all branches start ^, or -2 otherwise Returns: number of capturing subpatterns or negative values on error */ int pcre_info(const pcre *external_re, int *optptr, int *first_byte) { const real_pcre *re = (const real_pcre *)external_re; if (re == NULL) return PCRE_ERROR_NULL; if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC; if (optptr != NULL) *optptr = (int)(re->options & PUBLIC_OPTIONS); if (first_byte != NULL) *first_byte = ((re->options & PCRE_FIRSTSET) != 0)? re->first_byte : ((re->options & PCRE_STARTLINE) != 0)? -1 : -2; return re->top_bracket; } /************************************************* * Return info about compiled pattern * *************************************************/ /* This is a newer "info" function which has an extensible interface so that additional items can be added compatibly. Arguments: external_re points to compiled code extra_data points extra data, or NULL what what information is required where where to put the information Returns: 0 if data returned, negative on error */ int pcre_fullinfo(const pcre *external_re, const pcre_extra *extra_data, int what, void *where) { const real_pcre *re = (const real_pcre *)external_re; const pcre_study_data *study = NULL; if (re == NULL || where == NULL) return PCRE_ERROR_NULL; if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC; if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0) study = (pcre_study_data *)extra_data->study_data; switch (what) { case PCRE_INFO_OPTIONS: *((unsigned long int *)where) = re->options & PUBLIC_OPTIONS; break; case PCRE_INFO_SIZE: *((size_t *)where) = re->size; break; case PCRE_INFO_STUDYSIZE: *((size_t *)where) = (study == NULL)? 0 : study->size; break; case PCRE_INFO_CAPTURECOUNT: *((int *)where) = re->top_bracket; break; case PCRE_INFO_BACKREFMAX: *((int *)where) = re->top_backref; break; case PCRE_INFO_FIRSTBYTE: *((int *)where) = ((re->options & PCRE_FIRSTSET) != 0)? re->first_byte : ((re->options & PCRE_STARTLINE) != 0)? -1 : -2; break; case PCRE_INFO_FIRSTTABLE: *((const uschar **)where) = (study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0)? study->start_bits : NULL; break; case PCRE_INFO_LASTLITERAL: *((int *)where) = ((re->options & PCRE_REQCHSET) != 0)? re->req_byte : -1; break; case PCRE_INFO_NAMEENTRYSIZE: *((int *)where) = re->name_entry_size; break; case PCRE_INFO_NAMECOUNT: *((int *)where) = re->name_count; break; case PCRE_INFO_NAMETABLE: *((const uschar **)where) = (const uschar *)re + sizeof(real_pcre); break; default: return PCRE_ERROR_BADOPTION; } return 0; } /************************************************* * Return info about what features are configured * *************************************************/ /* This is function which has an extensible interface so that additional items can be added compatibly. Arguments: what what information is required where where to put the information Returns: 0 if data returned, negative on error */ int pcre_config(int what, void *where) { switch (what) { case PCRE_CONFIG_UTF8: #ifdef SUPPORT_UTF8 *((int *)where) = 1; #else *((int *)where) = 0; #endif break; case PCRE_CONFIG_NEWLINE: *((int *)where) = NEWLINE; break; case PCRE_CONFIG_LINK_SIZE: *((int *)where) = LINK_SIZE; break; case PCRE_CONFIG_POSIX_MALLOC_THRESHOLD: *((int *)where) = POSIX_MALLOC_THRESHOLD; break; case PCRE_CONFIG_MATCH_LIMIT: *((unsigned int *)where) = MATCH_LIMIT; break; default: return PCRE_ERROR_BADOPTION; } return 0; } #ifdef DEBUG /************************************************* * Debugging function to print chars * *************************************************/ /* Print a sequence of chars in printable format, stopping at the end of the subject if the requested. Arguments: p points to characters length number to print is_subject TRUE if printing from within md->start_subject md pointer to matching data block, if is_subject is TRUE Returns: nothing */ static void pchars(const uschar *p, int length, BOOL is_subject, match_data *md) { int c; if (is_subject && length > md->end_subject - p) length = md->end_subject - p; while (length-- > 0) if (isprint(c = *(p++))) printf("%c", c); else printf("\\x%02x", c); } #endif /************************************************* * Handle escapes * *************************************************/ /* This function is called when a \ has been encountered. It either returns a positive value for a simple escape such as \n, or a negative value which encodes one of the more complicated things such as \d. When UTF-8 is enabled, a positive value greater than 255 may be returned. On entry, ptr is pointing at the \. On exit, it is on the final character of the escape sequence. Arguments: ptrptr points to the pattern position pointer errorptr points to the pointer to the error message bracount number of previous extracting brackets options the options bits isclass TRUE if inside a character class cd pointer to char tables block Returns: zero or positive => a data character negative => a special escape sequence on error, errorptr is set */ static int check_escape(const uschar **ptrptr, const char **errorptr, int bracount, int options, BOOL isclass, compile_data *cd) { const uschar *ptr = *ptrptr; int c, i; /* If backslash is at the end of the pattern, it's an error. */ c = *(++ptr); if (c == 0) *errorptr = ERR1; /* Digits or letters may have special meaning; all others are literals. */ else if (c < '0' || c > 'z') {} /* Do an initial lookup in a table. A non-zero result is something that can be returned immediately. Otherwise further processing may be required. */ else if ((i = escapes[c - '0']) != 0) c = i; /* Escapes that need further processing, or are illegal. */ else { const uschar *oldptr; switch (c) { /* A number of Perl escapes are not handled by PCRE. We give an explicit error. */ case 'l': case 'L': case 'N': case 'p': case 'P': case 'u': case 'U': case 'X': *errorptr = ERR37; break; /* The handling of escape sequences consisting of a string of digits starting with one that is not zero is not straightforward. By experiment, the way Perl works seems to be as follows: Outside a character class, the digits are read as a decimal number. If the number is less than 10, or if there are that many previous extracting left brackets, then it is a back reference. Otherwise, up to three octal digits are read to form an escaped byte. Thus \123 is likely to be octal 123 (cf \0123, which is octal 012 followed by the literal 3). If the octal value is greater than 377, the least significant 8 bits are taken. Inside a character class, \ followed by a digit is always an octal number. */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (!isclass) { oldptr = ptr; c -= '0'; while ((cd->ctypes[ptr[1]] & ctype_digit) != 0) c = c * 10 + *(++ptr) - '0'; if (c < 10 || c <= bracount) { c = -(ESC_REF + c); break; } ptr = oldptr; /* Put the pointer back and fall through */ } /* Handle an octal number following \. If the first digit is 8 or 9, Perl generates a binary zero byte and treats the digit as a following literal. Thus we have to pull back the pointer by one. */ if ((c = *ptr) >= '8') { ptr--; c = 0; break; } /* \0 always starts an octal number, but we may drop through to here with a larger first octal digit. */ case '0': c -= '0'; while (i++ < 2 && (cd->ctypes[ptr[1]] & ctype_digit) != 0 && ptr[1] != '8' && ptr[1] != '9') c = c * 8 + *(++ptr) - '0'; c &= 255; /* Take least significant 8 bits */ break; /* \x is complicated when UTF-8 is enabled. \x{ddd} is a character number which can be greater than 0xff, but only if the ddd are hex digits. */ case 'x': #ifdef SUPPORT_UTF8 if (ptr[1] == '{' && (options & PCRE_UTF8) != 0) { const uschar *pt = ptr + 2; register int count = 0; c = 0; while ((cd->ctypes[*pt] & ctype_xdigit) != 0) { count++; c = c * 16 + cd->lcc[*pt] - (((cd->ctypes[*pt] & ctype_digit) != 0)? '0' : 'W'); pt++; } if (*pt == '}') { if (c < 0 || count > 8) *errorptr = ERR34; ptr = pt; break; } /* If the sequence of hex digits does not end with '}', then we don't recognize this construct; fall through to the normal \x handling. */ } #endif /* Read just a single hex char */ c = 0; while (i++ < 2 && (cd->ctypes[ptr[1]] & ctype_xdigit) != 0) { ptr++; c = c * 16 + cd->lcc[*ptr] - (((cd->ctypes[*ptr] & ctype_digit) != 0)? '0' : 'W'); } break; /* Other special escapes not starting with a digit are straightforward */ case 'c': c = *(++ptr); if (c == 0) { *errorptr = ERR2; return 0; } /* A letter is upper-cased; then the 0x40 bit is flipped */ if (c >= 'a' && c <= 'z') c = cd->fcc[c]; c ^= 0x40; break; /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any other alphameric following \ is an error if PCRE_EXTRA was set; otherwise, for Perl compatibility, it is a literal. This code looks a bit odd, but there used to be some cases other than the default, and there may be again in future, so I haven't "optimized" it. */ default: if ((options & PCRE_EXTRA) != 0) switch(c) { default: *errorptr = ERR3; break; } break; } } *ptrptr = ptr; return c; } /************************************************* * Check for counted repeat * *************************************************/ /* This function is called when a '{' is encountered in a place where it might start a quantifier. It looks ahead to see if it really is a quantifier or not. It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd} where the ddds are digits. Arguments: p pointer to the first char after '{' cd pointer to char tables block Returns: TRUE or FALSE */ static BOOL is_counted_repeat(const uschar *p, compile_data *cd) { if ((cd->ctypes[*p++] & ctype_digit) == 0) return FALSE; while ((cd->ctypes[*p] & ctype_digit) != 0) p++; if (*p == '}') return TRUE; if (*p++ != ',') return FALSE; if (*p == '}') return TRUE; if ((cd->ctypes[*p++] & ctype_digit) == 0) return FALSE; while ((cd->ctypes[*p] & ctype_digit) != 0) p++; return (*p == '}'); } /************************************************* * Read repeat counts * *************************************************/ /* Read an item of the form {n,m} and return the values. This is called only after is_counted_repeat() has confirmed that a repeat-count quantifier exists, so the syntax is guaranteed to be correct, but we need to check the values. Arguments: p pointer to first char after '{' minp pointer to int for min maxp pointer to int for max returned as -1 if no max errorptr points to pointer to error message cd pointer to character tables clock Returns: pointer to '}' on success; current ptr on error, with errorptr set */ static const uschar * read_repeat_counts(const uschar *p, int *minp, int *maxp, const char **errorptr, compile_data *cd) { int min = 0; int max = -1; while ((cd->ctypes[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0'; if (*p == '}') max = min; else { if (*(++p) != '}') { max = 0; while ((cd->ctypes[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0'; if (max < min) { *errorptr = ERR4; return p; } } } /* Do paranoid checks, then fill in the required variables, and pass back the pointer to the terminating '}'. */ if (min > 65535 || max > 65535) *errorptr = ERR5; else { *minp = min; *maxp = max; } return p; } /************************************************* * Find first significant op code * *************************************************/ /* This is called by several functions that scan a compiled expression looking for a fixed first character, or an anchoring op code etc. It skips over things that do not influence this. For some calls, a change of option is important. Arguments: code pointer to the start of the group options pointer to external options optbit the option bit whose changing is significant, or zero if none are Returns: pointer to the first significant opcode */ static const uschar* first_significant_code(const uschar *code, int *options, int optbit) { for (;;) { switch ((int)*code) { case OP_OPT: if (optbit > 0 && ((int)code[1] & optbit) != (*options & optbit)) *options = (int)code[1]; code += 2; break; case OP_ASSERT_NOT: case OP_ASSERTBACK: case OP_ASSERTBACK_NOT: do code += GET(code, 1); while (*code == OP_ALT); /* Fall through */ case OP_CALLOUT: case OP_CREF: case OP_BRANUMBER: case OP_WORD_BOUNDARY: case OP_NOT_WORD_BOUNDARY: code += OP_lengths[*code]; break; default: return code; } } /* Control never reaches here */ } /************************************************* * Find the fixed length of a pattern * *************************************************/ /* Scan a pattern and compute the fixed length of subject that will match it, if the length is fixed. This is needed for dealing with backward assertions. In UTF8 mode, the result is in characters rather than bytes. Arguments: code points to the start of the pattern (the bracket) options the compiling options Returns: the fixed length, or -1 if there is no fixed length, or -2 if \C was encountered */ static int find_fixedlength(uschar *code, int options) { int length = -1; register int branchlength = 0; register uschar *cc = code + 1 + LINK_SIZE; /* Scan along the opcodes for this branch. If we get to the end of the branch, check the length against that of the other branches. */ for (;;) { int d; register int op = *cc; if (op >= OP_BRA) op = OP_BRA; switch (op) { case OP_BRA: case OP_ONCE: case OP_COND: d = find_fixedlength(cc, options); if (d < 0) return d; branchlength += d; do cc += GET(cc, 1); while (*cc == OP_ALT); cc += 1 + LINK_SIZE; break; /* Reached end of a branch; if it's a ket it is the end of a nested call. If it's ALT it is an alternation in a nested call. If it is END it's the end of the outer call. All can be handled by the same code. */ case OP_ALT: case OP_KET: case OP_KETRMAX: case OP_KETRMIN: case OP_END: if (length < 0) length = branchlength; else if (length != branchlength) return -1; if (*cc != OP_ALT) return length; cc += 1 + LINK_SIZE; branchlength = 0; break; /* Skip over assertive subpatterns */ case OP_ASSERT: case OP_ASSERT_NOT: case OP_ASSERTBACK: case OP_ASSERTBACK_NOT: do cc += GET(cc, 1); while (*cc == OP_ALT); /* Fall through */ /* Skip over things that don't match chars */ case OP_REVERSE: case OP_BRANUMBER: case OP_CREF: case OP_OPT: case OP_CALLOUT: case OP_SOD: case OP_SOM: case OP_EOD: case OP_EODN: case OP_CIRC: case OP_DOLL: case OP_NOT_WORD_BOUNDARY: case OP_WORD_BOUNDARY: cc += OP_lengths[*cc]; break; /* Handle char strings. In UTF-8 mode we must count characters, not bytes. This requires a scan of the string, unfortunately. We assume valid UTF-8 strings, so all we do is reduce the length by one for every byte whose bits are 10xxxxxx. */ case OP_CHARS: branchlength += *(++cc); #ifdef SUPPORT_UTF8 if ((options & PCRE_UTF8) != 0) for (d = 1; d <= *cc; d++) if ((cc[d] & 0xc0) == 0x80) branchlength--; #endif cc += *cc + 1; break; /* Handle exact repetitions. The count is already in characters, but we need to skip over a multibyte character in UTF8 mode. */ case OP_EXACT: branchlength += GET2(cc,1); cc += 4; #ifdef SUPPORT_UTF8 if ((options & PCRE_UTF8) != 0) { while ((*cc & 0x80) == 0x80) cc++; } #endif break; case OP_TYPEEXACT: branchlength += GET2(cc,1); cc += 4; break; /* Handle single-char matchers */ case OP_NOT_DIGIT: case OP_DIGIT: case OP_NOT_WHITESPACE: case OP_WHITESPACE: case OP_NOT_WORDCHAR: case OP_WORDCHAR: case OP_ANY: branchlength++; cc++; break; /* The single-byte matcher isn't allowed */ case OP_ANYBYTE: return -2; /* Check a class for variable quantification */ #ifdef SUPPORT_UTF8 case OP_XCLASS: cc += GET(cc, 1) - 33; /* Fall through */ #endif case OP_CLASS: case OP_NCLASS: cc += 33; switch (*cc) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRQUERY: case OP_CRMINQUERY: return -1; case OP_CRRANGE: case OP_CRMINRANGE: if (GET2(cc,1) != GET2(cc,3)) return -1; branchlength += GET2(cc,1); cc += 5; break; default: branchlength++; } break; /* Anything else is variable length */ default: return -1; } } /* Control never gets here */ } /************************************************* * Scan compiled regex for numbered bracket * *************************************************/ /* This little function scans through a compiled pattern until it finds a capturing bracket with the given number. Arguments: code points to start of expression utf8 TRUE in UTF-8 mode number the required bracket number Returns: pointer to the opcode for the bracket, or NULL if not found */ static const uschar * find_bracket(const uschar *code, BOOL utf8, int number) { #ifndef SUPPORT_UTF8 utf8 = utf8; /* Stop pedantic compilers complaining */ #endif for (;;) { register int c = *code; if (c == OP_END) return NULL; else if (c == OP_CHARS) code += code[1] + OP_lengths[c]; else if (c > OP_BRA) { int n = c - OP_BRA; if (n > EXTRACT_BASIC_MAX) n = GET2(code, 2+LINK_SIZE); if (n == number) return (const uschar *)code; code += OP_lengths[OP_BRA]; } else { code += OP_lengths[c]; /* In UTF-8 mode, opcodes that are followed by a character may be followed by a multi-byte character. The length in the table is a minimum, so we have to scan along to skip the extra characters. All opcodes are less than 128, so we can use relatively efficient code. */ #ifdef SUPPORT_UTF8 if (utf8) switch(c) { case OP_EXACT: case OP_UPTO: case OP_MINUPTO: case OP_STAR: case OP_MINSTAR: case OP_PLUS: case OP_MINPLUS: case OP_QUERY: case OP_MINQUERY: while ((*code & 0xc0) == 0x80) code++; break; } #endif } } } /************************************************* * Scan compiled branch for non-emptiness * *************************************************/ /* This function scans through a branch of a compiled pattern to see whether it can match the empty string or not. It is called only from could_be_empty() below. Note that first_significant_code() skips over assertions. If we hit an unclosed bracket, we return "empty" - this means we've struck an inner bracket whose current branch will already have been scanned. Arguments: code points to start of search endcode points to where to stop utf8 TRUE if in UTF8 mode Returns: TRUE if what is matched could be empty */ static BOOL could_be_empty_branch(const uschar *code, const uschar *endcode, BOOL utf8) { register int c; for (code = first_significant_code(code + 1 + LINK_SIZE, NULL, 0); code < endcode; code = first_significant_code(code + OP_lengths[c], NULL, 0)) { const uschar *ccode; c = *code; if (c >= OP_BRA) { BOOL empty_branch; if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */ /* Scan a closed bracket */ empty_branch = FALSE; do { if (!empty_branch && could_be_empty_branch(code, endcode, utf8)) empty_branch = TRUE; code += GET(code, 1); } while (*code == OP_ALT); if (!empty_branch) return FALSE; /* All branches are non-empty */ code += 1 + LINK_SIZE; c = *code; } else switch (c) { /* Check for quantifiers after a class */ #ifdef SUPPORT_UTF8 case OP_XCLASS: ccode = code + GET(code, 1); goto CHECK_CLASS_REPEAT; #endif case OP_CLASS: case OP_NCLASS: ccode = code + 33; #ifdef SUPPORT_UTF8 CHECK_CLASS_REPEAT: #endif switch (*ccode) { case OP_CRSTAR: /* These could be empty; continue */ case OP_CRMINSTAR: case OP_CRQUERY: case OP_CRMINQUERY: break; default: /* Non-repeat => class must match */ case OP_CRPLUS: /* These repeats aren't empty */ case OP_CRMINPLUS: return FALSE; case OP_CRRANGE: case OP_CRMINRANGE: if (GET2(ccode, 1) > 0) return FALSE; /* Minimum > 0 */ break; } break; /* Opcodes that must match a character */ case OP_NOT_DIGIT: case OP_DIGIT: case OP_NOT_WHITESPACE: case OP_WHITESPACE: case OP_NOT_WORDCHAR: case OP_WORDCHAR: case OP_ANY: case OP_ANYBYTE: case OP_CHARS: case OP_NOT: case OP_PLUS: case OP_MINPLUS: case OP_EXACT: case OP_NOTPLUS: case OP_NOTMINPLUS: case OP_NOTEXACT: case OP_TYPEPLUS: case OP_TYPEMINPLUS: case OP_TYPEEXACT: return FALSE; /* End of branch */ case OP_KET: case OP_KETRMAX: case OP_KETRMIN: case OP_ALT: return TRUE; /* In UTF-8 mode, STAR, MINSTAR, QUERY, MINQUERY, UPTO, and MINUPTO may be followed by a multibyte character */ #ifdef SUPPORT_UTF8 case OP_STAR: case OP_MINSTAR: case OP_QUERY: case OP_MINQUERY: case OP_UPTO: case OP_MINUPTO: if (utf8) while ((code[2] & 0xc0) == 0x80) code++; break; #endif } } return TRUE; } /************************************************* * Scan compiled regex for non-emptiness * *************************************************/ /* This function is called to check for left recursive calls. We want to check the current branch of the current pattern to see if it could match the empty string. If it could, we must look outwards for branches at other levels, stopping when we pass beyond the bracket which is the subject of the recursion. Arguments: code points to start of the recursion endcode points to where to stop (current RECURSE item) bcptr points to the chain of current (unclosed) branch starts utf8 TRUE if in UTF-8 mode Returns: TRUE if what is matched could be empty */ static BOOL could_be_empty(const uschar *code, const uschar *endcode, branch_chain *bcptr, BOOL utf8) { while (bcptr != NULL && bcptr->current >= code) { if (!could_be_empty_branch(bcptr->current, endcode, utf8)) return FALSE; bcptr = bcptr->outer; } return TRUE; } /************************************************* * Check for POSIX class syntax * *************************************************/ /* This function is called when the sequence "[:" or "[." or "[=" is encountered in a character class. It checks whether this is followed by an optional ^ and then a sequence of letters, terminated by a matching ":]" or ".]" or "=]". Argument: ptr pointer to the initial [ endptr where to return the end pointer cd pointer to compile data Returns: TRUE or FALSE */ static BOOL check_posix_syntax(const uschar *ptr, const uschar **endptr, compile_data *cd) { int terminator; /* Don't combine these lines; the Solaris cc */ terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */ if (*(++ptr) == '^') ptr++; while ((cd->ctypes[*ptr] & ctype_letter) != 0) ptr++; if (*ptr == terminator && ptr[1] == ']') { *endptr = ptr; return TRUE; } return FALSE; } /************************************************* * Check POSIX class name * *************************************************/ /* This function is called to check the name given in a POSIX-style class entry such as [:alnum:]. Arguments: ptr points to the first letter len the length of the name Returns: a value representing the name, or -1 if unknown */ static int check_posix_name(const uschar *ptr, int len) { register int yield = 0; while (posix_name_lengths[yield] != 0) { if (len == posix_name_lengths[yield] && strncmp((const char *)ptr, posix_names[yield], len) == 0) return yield; yield++; } return -1; } /************************************************* * Compile one branch * *************************************************/ /* Scan the pattern, compiling it into the code vector. If the options are changed during the branch, the pointer is used to change the external options bits. Arguments: optionsptr pointer to the option bits brackets points to number of extracting brackets used code points to the pointer to the current code point ptrptr points to the current pattern pointer errorptr points to pointer to error message firstbyteptr set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE) reqbyteptr set to the last literal character required, else < 0 bcptr points to current branch chain cd contains pointers to tables etc. Returns: TRUE on success FALSE, with *errorptr set on error */ static BOOL compile_branch(int *optionsptr, int *brackets, uschar **codeptr, const uschar **ptrptr, const char **errorptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd) { int repeat_type, op_type; int repeat_min = 0, repeat_max = 0; /* To please picky compilers */ int bravalue = 0; int length; int greedy_default, greedy_non_default; int firstbyte, reqbyte; int zeroreqbyte, zerofirstbyte; int req_caseopt, reqvary, tempreqvary; int condcount = 0; int options = *optionsptr; register int c; register uschar *code = *codeptr; uschar *tempcode; BOOL inescq = FALSE; BOOL groupsetfirstbyte = FALSE; const uschar *ptr = *ptrptr; const uschar *tempptr; uschar *previous = NULL; uschar class[32]; #ifdef SUPPORT_UTF8 BOOL class_utf8; BOOL utf8 = (options & PCRE_UTF8) != 0; uschar *class_utf8data; uschar utf8_char[6]; #else BOOL utf8 = FALSE; #endif /* Set up the default and non-default settings for greediness */ greedy_default = ((options & PCRE_UNGREEDY) != 0); greedy_non_default = greedy_default ^ 1; /* Initialize no first char, no required char. REQ_UNSET means "no char matching encountered yet". It gets changed to REQ_NONE if we hit something that matches a non-fixed char first char; reqbyte just remains unset if we never find one. When we hit a repeat whose minimum is zero, we may have to adjust these values to take the zero repeat into account. This is implemented by setting them to zerofirstbyte and zeroreqbyte when such a repeat is encountered. The individual item types that can be repeated set these backoff variables appropriately. */ firstbyte = reqbyte = zerofirstbyte = zeroreqbyte = REQ_UNSET; /* The variable req_caseopt contains either the REQ_CASELESS value or zero, according to the current setting of the caseless flag. REQ_CASELESS is a bit value > 255. It is added into the firstbyte or reqbyte variables to record the case status of the value. */ req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0; /* Switch on next character until the end of the branch */ for (;; ptr++) { BOOL negate_class; BOOL possessive_quantifier; int class_charcount; int class_lastchar; int newoptions; int recno; int skipbytes; int subreqbyte; int subfirstbyte; c = *ptr; if (inescq && c != 0) goto NORMAL_CHAR; if ((options & PCRE_EXTENDED) != 0) { if ((cd->ctypes[c] & ctype_space) != 0) continue; if (c == '#') { /* The space before the ; is to avoid a warning on a silly compiler on the Macintosh. */ while ((c = *(++ptr)) != 0 && c != NEWLINE) ; if (c != 0) continue; /* Else fall through to handle end of string */ } } switch(c) { /* The branch terminates at end of string, |, or ). */ case 0: case '|': case ')': *firstbyteptr = firstbyte; *reqbyteptr = reqbyte; *codeptr = code; *ptrptr = ptr; return TRUE; /* Handle single-character metacharacters. In multiline mode, ^ disables the setting of any following char as a first character. */ case '^': if ((options & PCRE_MULTILINE) != 0) { if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; } previous = NULL; *code++ = OP_CIRC; break; case '$': previous = NULL; *code++ = OP_DOLL; break; /* There can never be a first char if '.' is first, whatever happens about repeats. The value of reqbyte doesn't change either. */ case '.': if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; zerofirstbyte = firstbyte; zeroreqbyte = reqbyte; previous = code; *code++ = OP_ANY; break; /* Character classes. If the included characters are all < 255 in value, we build a 32-byte bitmap of the permitted characters, except in the special case where there is only one such character. For negated classes, we build the map as usual, then invert it at the end. However, we use a different opcode so that data characters > 255 can be handled correctly. If the class contains characters outside the 0-255 range, a different opcode is compiled. It may optionally have a bit map for characters < 256, but those above are are explicitly listed afterwards. A flag byte tells whether the bitmap is present, and whether this is a negated class or not. */ case '[': previous = code; /* PCRE supports POSIX class stuff inside a class. Perl gives an error if they are encountered at the top level, so we'll do that too. */ if ((ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') && check_posix_syntax(ptr, &tempptr, cd)) { *errorptr = (ptr[1] == ':')? ERR13 : ERR31; goto FAILED; } /* If the first character is '^', set the negation flag and skip it. */ if ((c = *(++ptr)) == '^') { negate_class = TRUE; c = *(++ptr); } else { negate_class = FALSE; } /* Keep a count of chars with values < 256 so that we can optimize the case of just a single character (as long as it's < 256). For higher valued UTF-8 characters, we don't yet do any optimization. */ class_charcount = 0; class_lastchar = -1; #ifdef SUPPORT_UTF8 class_utf8 = FALSE; /* No chars >= 256 */ class_utf8data = code + LINK_SIZE + 34; /* For UTF-8 items */ #endif /* Initialize the 32-char bit map to all zeros. We have to build the map in a temporary bit of store, in case the class contains only 1 character (< 256), because in that case the compiled code doesn't use the bit map. */ memset(class, 0, 32 * sizeof(uschar)); /* Process characters until ] is reached. By writing this as a "do" it means that an initial ] is taken as a data character. The first pass through the regex checked the overall syntax, so we don't need to be very strict here. At the start of the loop, c contains the first byte of the character. */ do { #ifdef SUPPORT_UTF8 if (utf8 && c > 127) { /* Braces are required because the */ GETCHARLEN(c, ptr, ptr); /* macro generates multiple statements */ } #endif /* Inside \Q...\E everything is literal except \E */ if (inescq) { if (c == '\\' && ptr[1] == 'E') { inescq = FALSE; ptr++; continue; } else goto LONE_SINGLE_CHARACTER; } /* Handle POSIX class names. Perl allows a negation extension of the form [:^name:]. A square bracket that doesn't match the syntax is treated as a literal. We also recognize the POSIX constructions [.ch.] and [=ch=] ("collating elements") and fault them, as Perl 5.6 and 5.8 do. */ if (c == '[' && (ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') && check_posix_syntax(ptr, &tempptr, cd)) { BOOL local_negate = FALSE; int posix_class, i; register const uschar *cbits = cd->cbits; if (ptr[1] != ':') { *errorptr = ERR31; goto FAILED; } ptr += 2; if (*ptr == '^') { local_negate = TRUE; ptr++; } posix_class = check_posix_name(ptr, tempptr - ptr); if (posix_class < 0) { *errorptr = ERR30; goto FAILED; } /* If matching is caseless, upper and lower are converted to alpha. This relies on the fact that the class table starts with alpha, lower, upper as the first 3 entries. */ if ((options & PCRE_CASELESS) != 0 && posix_class <= 2) posix_class = 0; /* Or into the map we are building up to 3 of the static class tables, or their negations. The [:blank:] class sets up the same chars as the [:space:] class (all white space). We remove the vertical white space chars afterwards. */ posix_class *= 3; for (i = 0; i < 3; i++) { BOOL isblank = strncmp((const char *)ptr, "blank", 5) == 0; int taboffset = posix_class_maps[posix_class + i]; if (taboffset < 0) break; if (local_negate) { for (c = 0; c < 32; c++) class[c] |= ~cbits[c+taboffset]; if (isblank) class[1] |= 0x3c; } else { for (c = 0; c < 32; c++) class[c] |= cbits[c+taboffset]; if (isblank) class[1] &= ~0x3c; } } ptr = tempptr + 1; class_charcount = 10; /* Set > 1; assumes more than 1 per class */ continue; /* End of POSIX syntax handling */ } /* Backslash may introduce a single character, or it may introduce one of the specials, which just set a flag. Escaped items are checked for validity in the pre-compiling pass. The sequence \b is a special case. Inside a class (and only there) it is treated as backspace. Elsewhere it marks a word boundary. Other escapes have preset maps ready to or into the one we are building. We assume they have more than one character in them, so set class_charcount bigger than one. */ if (c == '\\') { c = check_escape(&ptr, errorptr, *brackets, options, TRUE, cd); if (-c == ESC_b) c = '\b'; /* \b is backslash in a class */ if (-c == ESC_Q) /* Handle start of quoted string */ { if (ptr[1] == '\\' && ptr[2] == 'E') { ptr += 2; /* avoid empty string */ } else inescq = TRUE; continue; } else if (c < 0) { register const uschar *cbits = cd->cbits; class_charcount = 10; /* Greater than 1 is what matters */ switch (-c) { case ESC_d: for (c = 0; c < 32; c++) class[c] |= cbits[c+cbit_digit]; continue; case ESC_D: for (c = 0; c < 32; c++) class[c] |= ~cbits[c+cbit_digit]; continue; case ESC_w: for (c = 0; c < 32; c++) class[c] |= cbits[c+cbit_word]; continue; case ESC_W: for (c = 0; c < 32; c++) class[c] |= ~cbits[c+cbit_word]; continue; case ESC_s: for (c = 0; c < 32; c++) class[c] |= cbits[c+cbit_space]; class[1] &= ~0x08; /* Perl 5.004 onwards omits VT from \s */ continue; case ESC_S: for (c = 0; c < 32; c++) class[c] |= ~cbits[c+cbit_space]; class[1] |= 0x08; /* Perl 5.004 onwards omits VT from \s */ continue; /* Unrecognized escapes are faulted if PCRE is running in its strict mode. By default, for compatibility with Perl, they are treated as literals. */ default: if ((options & PCRE_EXTRA) != 0) { *errorptr = ERR7; goto FAILED; } c = *ptr; /* The final character */ } } /* Fall through if we have a single character (c >= 0). This may be > 256 in UTF-8 mode. */ } /* End of backslash handling */ /* A single character may be followed by '-' to form a range. However, Perl does not permit ']' to be the end of the range. A '-' character here is treated as a literal. */ if (ptr[1] == '-' && ptr[2] != ']') { int d; ptr += 2; #ifdef SUPPORT_UTF8 if (utf8) { /* Braces are required because the */ GETCHARLEN(d, ptr, ptr); /* macro generates multiple statements */ } else #endif d = *ptr; /* The second part of a range can be a single-character escape, but not any of the other escapes. Perl 5.6 treats a hyphen as a literal in such circumstances. */ if (d == '\\') { const uschar *oldptr = ptr; d = check_escape(&ptr, errorptr, *brackets, options, TRUE, cd); /* \b is backslash; any other special means the '-' was literal */ if (d < 0) { if (d == -ESC_b) d = '\b'; else { ptr = oldptr - 2; goto LONE_SINGLE_CHARACTER; /* A few lines below */ } } } /* Check that the two values are in the correct order */ if (d < c) { *errorptr = ERR8; goto FAILED; } /* If d is greater than 255, we can't just use the bit map, so set up for the UTF-8 supporting class type. If we are not caseless, we can just set up a single range. If we are caseless, the characters < 256 are handled with a bitmap, in order to get the case-insensitive handling. */ #ifdef SUPPORT_UTF8 if (d > 255) { class_utf8 = TRUE; *class_utf8data++ = XCL_RANGE; if ((options & PCRE_CASELESS) == 0) { class_utf8data += ord2utf8(c, class_utf8data); class_utf8data += ord2utf8(d, class_utf8data); continue; /* Go get the next char in the class */ } class_utf8data += ord2utf8(256, class_utf8data); class_utf8data += ord2utf8(d, class_utf8data); d = 255; /* Fall through */ } #endif /* We use the bit map if the range is entirely < 255, or if part of it is < 255 and matching is caseless. */ for (; c <= d; c++) { class[c/8] |= (1 << (c&7)); if ((options & PCRE_CASELESS) != 0) { int uc = cd->fcc[c]; /* flip case */ class[uc/8] |= (1 << (uc&7)); } class_charcount++; /* in case a one-char range */ class_lastchar = c; } continue; /* Go get the next char in the class */ } /* Handle a lone single character - we can get here for a normal non-escape char, or after \ that introduces a single character. */ LONE_SINGLE_CHARACTER: /* Handle a multibyte character */ #ifdef SUPPORT_UTF8 if (utf8 && c > 255) { class_utf8 = TRUE; *class_utf8data++ = XCL_SINGLE; class_utf8data += ord2utf8(c, class_utf8data); } else #endif /* Handle a single-byte character */ { class [c/8] |= (1 << (c&7)); if ((options & PCRE_CASELESS) != 0) { c = cd->fcc[c]; /* flip case */ class[c/8] |= (1 << (c&7)); } class_charcount++; class_lastchar = c; } } /* Loop until ']' reached; the check for end of string happens inside the loop. This "while" is the end of the "do" above. */ while ((c = *(++ptr)) != ']' || inescq); /* If class_charcount is 1, we saw precisely one character with a value < 256. In UTF-8 mode, we can optimize if there were no characters >= 256 and the one character is < 128. In non-UTF-8 mode we can always optimize. The optimization throws away the bit map. We turn the item into a 1-character OP_CHARS if it's positive, or OP_NOT if it's negative. Note that OP_NOT does not support multibyte characters. In the positive case, it can cause firstbyte to be set. Otherwise, there can be no first char if this item is first, whatever repeat count may follow. In the case of reqbyte, save the previous value for reinstating. */ #ifdef SUPPORT_UTF8 if (class_charcount == 1 && (!utf8 || (!class_utf8 && class_lastchar < 128))) #else if (class_charcount == 1) #endif { zeroreqbyte = reqbyte; if (negate_class) { if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; zerofirstbyte = firstbyte; *code++ = OP_NOT; } else { if (firstbyte == REQ_UNSET) { zerofirstbyte = REQ_NONE; firstbyte = class_lastchar | req_caseopt; } else { zerofirstbyte = firstbyte; reqbyte = class_lastchar | req_caseopt | cd->req_varyopt; } *code++ = OP_CHARS; *code++ = 1; } *code++ = class_lastchar; break; /* End of class handling */ } /* End of 1-byte optimization */ /* Otherwise, if this is the first thing in the branch, there can be no first char setting, whatever the repeat count. Any reqbyte setting must remain unchanged after any kind of repeat. */ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; zerofirstbyte = firstbyte; zeroreqbyte = reqbyte; /* If there are characters with values > 255, we have to compile an extended class, with its own opcode. If there are no characters < 256, we can omit the bitmap. */ #ifdef SUPPORT_UTF8 if (class_utf8) { *class_utf8data++ = XCL_END; /* Marks the end of extra data */ *code++ = OP_XCLASS; code += LINK_SIZE; *code = negate_class? XCL_NOT : 0; /* If the map is required, install it, and move on to the end of the extra data */ if (class_charcount > 0) { *code++ |= XCL_MAP; memcpy(code, class, 32); code = class_utf8data; } /* If the map is not required, slide down the extra data. */ else { int len = class_utf8data - (code + 33); memmove(code + 1, code + 33, len); code += len + 1; } /* Now fill in the complete length of the item */ PUT(previous, 1, code - previous); break; /* End of class handling */ } #endif /* If there are no characters > 255, negate the 32-byte map if necessary, and copy it into the code vector. If this is the first thing in the branch, there can be no first char setting, whatever the repeat count. Any reqbyte setting must remain unchanged after any kind of repeat. */ if (negate_class) { *code++ = OP_NCLASS; for (c = 0; c < 32; c++) code[c] = ~class[c]; } else { *code++ = OP_CLASS; memcpy(code, class, 32); } code += 32; break; /* Various kinds of repeat */ case '{': if (!is_counted_repeat(ptr+1, cd)) goto NORMAL_CHAR; ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorptr, cd); if (*errorptr != NULL) goto FAILED; goto REPEAT; case '*': repeat_min = 0; repeat_max = -1; goto REPEAT; case '+': repeat_min = 1; repeat_max = -1; goto REPEAT; case '?': repeat_min = 0; repeat_max = 1; REPEAT: if (previous == NULL) { *errorptr = ERR9; goto FAILED; } if (repeat_min == 0) { firstbyte = zerofirstbyte; /* Adjust for zero repeat */ reqbyte = zeroreqbyte; /* Ditto */ } /* Remember whether this is a variable length repeat */ reqvary = (repeat_min == repeat_max)? 0 : REQ_VARY; op_type = 0; /* Default single-char op codes */ possessive_quantifier = FALSE; /* Default not possessive quantifier */ /* Save start of previous item, in case we have to move it up to make space for an inserted OP_ONCE for the additional '+' extension. */ tempcode = previous; /* If the next character is '+', we have a possessive quantifier. This implies greediness, whatever the setting of the PCRE_UNGREEDY option. If the next character is '?' this is a minimizing repeat, by default, but if PCRE_UNGREEDY is set, it works the other way round. We change the repeat type to the non-default. */ if (ptr[1] == '+') { repeat_type = 0; /* Force greedy */ possessive_quantifier = TRUE; ptr++; } else if (ptr[1] == '?') { repeat_type = greedy_non_default; ptr++; } else repeat_type = greedy_default; /* If previous was a recursion, we need to wrap it inside brackets so that it can be replicated if necessary. */ if (*previous == OP_RECURSE) { memmove(previous + 1 + LINK_SIZE, previous, 1 + LINK_SIZE); code += 1 + LINK_SIZE; *previous = OP_BRA; PUT(previous, 1, code - previous); *code = OP_KET; PUT(code, 1, code - previous); code += 1 + LINK_SIZE; } /* If previous was a string of characters, chop off the last one and use it as the subject of the repeat. If there was only one character, we can abolish the previous item altogether. If a one-char item has a minumum of more than one, ensure that it is set in reqbyte - it might not be if a sequence such as x{3} is the first thing in a branch because the x will have gone into firstbyte instead. */ if (*previous == OP_CHARS) { /* Deal with UTF-8 characters that take up more than one byte. It's easier to write this out separately than try to macrify it. Use c to hold the length of the character in bytes, plus 0x80 to flag that it's a length rather than a small character. */ #ifdef SUPPORT_UTF8 if (utf8 && (code[-1] & 0x80) != 0) { uschar *lastchar = code - 1; while ((*lastchar & 0xc0) == 0x80) lastchar--; c = code - lastchar; /* Length of UTF-8 character */ memcpy(utf8_char, lastchar, c); /* Save the char */ if (lastchar == previous + 2) /* There was only one character */ { code = previous; /* Abolish the previous item */ } else { previous[1] -= c; /* Adjust length of previous */ code = lastchar; /* Lost char off the end */ tempcode = code; /* Adjust position to be moved for '+' */ } c |= 0x80; /* Flag c as a length */ } else #endif /* Handle the case of a single byte - either with no UTF8 support, or with UTF-8 disabled, or for a UTF-8 character < 128. */ { c = *(--code); if (code == previous + 2) /* There was only one character */ { code = previous; /* Abolish the previous item */ if (repeat_min > 1) reqbyte = c | req_caseopt | cd->req_varyopt; } else { previous[1]--; /* adjust length */ tempcode = code; /* Adjust position to be moved for '+' */ } } goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */ } /* If previous was a single negated character ([^a] or similar), we use one of the special opcodes, replacing it. The code is shared with single- character repeats by setting opt_type to add a suitable offset into repeat_type. OP_NOT is currently used only for single-byte chars. */ else if (*previous == OP_NOT) { op_type = OP_NOTSTAR - OP_STAR; /* Use "not" opcodes */ c = previous[1]; code = previous; goto OUTPUT_SINGLE_REPEAT; } /* If previous was a character type match (\d or similar), abolish it and create a suitable repeat item. The code is shared with single-character repeats by setting op_type to add a suitable offset into repeat_type. */ else if (*previous < OP_EODN) { op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */ c = *previous; code = previous; OUTPUT_SINGLE_REPEAT: /* If the maximum is zero then the minimum must also be zero; Perl allows this case, so we do too - by simply omitting the item altogether. */ if (repeat_max == 0) goto END_REPEAT; /* Combine the op_type with the repeat_type */ repeat_type += op_type; /* A minimum of zero is handled either as the special case * or ?, or as an UPTO, with the maximum given. */ if (repeat_min == 0) { if (repeat_max == -1) *code++ = OP_STAR + repeat_type; else if (repeat_max == 1) *code++ = OP_QUERY + repeat_type; else { *code++ = OP_UPTO + repeat_type; PUT2INC(code, 0, repeat_max); } } /* The case {1,} is handled as the special case + */ else if (repeat_min == 1 && repeat_max == -1) *code++ = OP_PLUS + repeat_type; /* The case {n,n} is just an EXACT, while the general case {n,m} is handled as an EXACT followed by an UPTO. An EXACT of 1 is optimized. */ else { if (repeat_min != 1) { *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */ PUT2INC(code, 0, repeat_min); } /* If the mininum is 1 and the previous item was a character string, we either have to put back the item that got cancelled if the string length was 1, or add the character back onto the end of a longer string. For a character type nothing need be done; it will just get put back naturally. Note that the final character is always going to get added below, so we leave code ready for its insertion. */ else if (*previous == OP_CHARS) { if (code == previous) code += 2; else /* In UTF-8 mode, a multibyte char has its length in c, with the 0x80 bit set as a flag. The length will always be between 2 and 6. */ #ifdef SUPPORT_UTF8 if (utf8 && c >= 128) previous[1] += c & 7; else #endif previous[1]++; } /* For a single negated character we also have to put back the item that got cancelled. At present this applies only to single byte characters in any mode. */ else if (*previous == OP_NOT) code++; /* If the maximum is unlimited, insert an OP_STAR. Before doing so, we have to insert the character for the previous code. In UTF-8 mode, long characters have their length in c, with the 0x80 bit as a flag. */ if (repeat_max < 0) { #ifdef SUPPORT_UTF8 if (utf8 && c >= 128) { memcpy(code, utf8_char, c & 7); code += c & 7; } else #endif *code++ = c; *code++ = OP_STAR + repeat_type; } /* Else insert an UPTO if the max is greater than the min, again preceded by the character, for the previously inserted code. */ else if (repeat_max != repeat_min) { #ifdef SUPPORT_UTF8 if (utf8 && c >= 128) { memcpy(code, utf8_char, c & 7); code += c & 7; } else #endif *code++ = c; repeat_max -= repeat_min; *code++ = OP_UPTO + repeat_type; PUT2INC(code, 0, repeat_max); } } /* The character or character type itself comes last in all cases. */ #ifdef SUPPORT_UTF8 if (utf8 && c >= 128) { memcpy(code, utf8_char, c & 7); code += c & 7; } else #endif *code++ = c; } /* If previous was a character class or a back reference, we put the repeat stuff after it, but just skip the item if the repeat was {0,0}. */ else if (*previous == OP_CLASS || *previous == OP_NCLASS || #ifdef SUPPORT_UTF8 *previous == OP_XCLASS || #endif *previous == OP_REF) { if (repeat_max == 0) { code = previous; goto END_REPEAT; } if (repeat_min == 0 && repeat_max == -1) *code++ = OP_CRSTAR + repeat_type; else if (repeat_min == 1 && repeat_max == -1) *code++ = OP_CRPLUS + repeat_type; else if (repeat_min == 0 && repeat_max == 1) *code++ = OP_CRQUERY + repeat_type; else { *code++ = OP_CRRANGE + repeat_type; PUT2INC(code, 0, repeat_min); if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */ PUT2INC(code, 0, repeat_max); } } /* If previous was a bracket group, we may have to replicate it in certain cases. */ else if (*previous >= OP_BRA || *previous == OP_ONCE || *previous == OP_COND) { register int i; int ketoffset = 0; int len = code - previous; uschar *bralink = NULL; /* If the maximum repeat count is unlimited, find the end of the bracket by scanning through from the start, and compute the offset back to it from the current code pointer. There may be an OP_OPT setting following the final KET, so we can't find the end just by going back from the code pointer. */ if (repeat_max == -1) { register uschar *ket = previous; do ket += GET(ket, 1); while (*ket != OP_KET); ketoffset = code - ket; } /* The case of a zero minimum is special because of the need to stick OP_BRAZERO in front of it, and because the group appears once in the data, whereas in other cases it appears the minimum number of times. For this reason, it is simplest to treat this case separately, as otherwise the code gets far too messy. There are several special subcases when the minimum is zero. */ if (repeat_min == 0) { /* If the maximum is also zero, we just omit the group from the output altogether. */ if (repeat_max == 0) { code = previous; goto END_REPEAT; } /* If the maximum is 1 or unlimited, we just have to stick in the BRAZERO and do no more at this point. */ if (repeat_max <= 1) { memmove(previous+1, previous, len); code++; *previous++ = OP_BRAZERO + repeat_type; } /* If the maximum is greater than 1 and limited, we have to replicate in a nested fashion, sticking OP_BRAZERO before each set of brackets. The first one has to be handled carefully because it's the original copy, which has to be moved up. The remainder can be handled by code that is common with the non-zero minimum case below. We just have to adjust the value or repeat_max, since one less copy is required. */ else { int offset; memmove(previous + 2 + LINK_SIZE, previous, len); code += 2 + LINK_SIZE; *previous++ = OP_BRAZERO + repeat_type; *previous++ = OP_BRA; /* We chain together the bracket offset fields that have to be filled in later when the ends of the brackets are reached. */ offset = (bralink == NULL)? 0 : previous - bralink; bralink = previous; PUTINC(previous, 0, offset); } repeat_max--; } /* If the minimum is greater than zero, replicate the group as many times as necessary, and adjust the maximum to the number of subsequent copies that we need. If we set a first char from the group, and didn't set a required char, copy the latter from the former. */ else { if (repeat_min > 1) { if (groupsetfirstbyte && reqbyte < 0) reqbyte = firstbyte; for (i = 1; i < repeat_min; i++) { memcpy(code, previous, len); code += len; } } if (repeat_max > 0) repeat_max -= repeat_min; } /* This code is common to both the zero and non-zero minimum cases. If the maximum is limited, it replicates the group in a nested fashion, remembering the bracket starts on a stack. In the case of a zero minimum, the first one was set up above. In all cases the repeat_max now specifies the number of additional copies needed. */ if (repeat_max >= 0) { for (i = repeat_max - 1; i >= 0; i--) { *code++ = OP_BRAZERO + repeat_type; /* All but the final copy start a new nesting, maintaining the chain of brackets outstanding. */ if (i != 0) { int offset; *code++ = OP_BRA; offset = (bralink == NULL)? 0 : code - bralink; bralink = code; PUTINC(code, 0, offset); } memcpy(code, previous, len); code += len; } /* Now chain through the pending brackets, and fill in their length fields (which are holding the chain links pro tem). */ while (bralink != NULL) { int oldlinkoffset; int offset = code - bralink + 1; uschar *bra = code - offset; oldlinkoffset = GET(bra, 1); bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset; *code++ = OP_KET; PUTINC(code, 0, offset); PUT(bra, 1, offset); } } /* If the maximum is unlimited, set a repeater in the final copy. We can't just offset backwards from the current code point, because we don't know if there's been an options resetting after the ket. The correct offset was computed above. */ else code[-ketoffset] = OP_KETRMAX + repeat_type; } /* Else there's some kind of shambles */ else { *errorptr = ERR11; goto FAILED; } /* If the character following a repeat is '+', we wrap the entire repeated item inside OP_ONCE brackets. This is just syntactic sugar, taken from Sun's Java package. The repeated item starts at tempcode, not at previous, which might be the first part of a string whose (former) last char we repeated. However, we don't support '+' after a greediness '?'. */ if (possessive_quantifier) { int len = code - tempcode; memmove(tempcode + 1+LINK_SIZE, tempcode, len); code += 1 + LINK_SIZE; len += 1 + LINK_SIZE; tempcode[0] = OP_ONCE; *code++ = OP_KET; PUTINC(code, 0, len); PUT(tempcode, 1, len); } /* In all case we no longer have a previous item. We also set the "follows varying string" flag for subsequently encountered reqbytes if it isn't already set and we have just passed a varying length item. */ END_REPEAT: previous = NULL; cd->req_varyopt |= reqvary; break; /* Start of nested bracket sub-expression, or comment or lookahead or lookbehind or option setting or condition. First deal with special things that can come after a bracket; all are introduced by ?, and the appearance of any of them means that this is not a referencing group. They were checked for validity in the first pass over the string, so we don't have to check for syntax errors here. */ case '(': newoptions = options; skipbytes = 0; if (*(++ptr) == '?') { int set, unset; int *optset; switch (*(++ptr)) { case '#': /* Comment; skip to ket */ ptr++; while (*ptr != ')') ptr++; continue; case ':': /* Non-extracting bracket */ bravalue = OP_BRA; ptr++; break; case '(': bravalue = OP_COND; /* Conditional group */ /* Condition to test for recursion */ if (ptr[1] == 'R') { code[1+LINK_SIZE] = OP_CREF; PUT2(code, 2+LINK_SIZE, CREF_RECURSE); skipbytes = 3; ptr += 3; } /* Condition to test for a numbered subpattern match */ else if ((cd->ctypes[ptr[1]] & ctype_digit) != 0) { int condref; /* Don't amalgamate; some compilers */ condref = *(++ptr) - '0'; /* grumble at autoincrement in declaration */ while (*(++ptr) != ')') condref = condref*10 + *ptr - '0'; if (condref == 0) { *errorptr = ERR35; goto FAILED; } ptr++; code[1+LINK_SIZE] = OP_CREF; PUT2(code, 2+LINK_SIZE, condref); skipbytes = 3; } /* For conditions that are assertions, we just fall through, having set bravalue above. */ break; case '=': /* Positive lookahead */ bravalue = OP_ASSERT; ptr++; break; case '!': /* Negative lookahead */ bravalue = OP_ASSERT_NOT; ptr++; break; case '<': /* Lookbehinds */ switch (*(++ptr)) { case '=': /* Positive lookbehind */ bravalue = OP_ASSERTBACK; ptr++; break; case '!': /* Negative lookbehind */ bravalue = OP_ASSERTBACK_NOT; ptr++; break; } break; case '>': /* One-time brackets */ bravalue = OP_ONCE; ptr++; break; case 'C': /* Callout - may be followed by digits */ *code++ = OP_CALLOUT; { int n = 0; while ((cd->ctypes[*(++ptr)] & ctype_digit) != 0) n = n * 10 + *ptr - '0'; if (n > 255) { *errorptr = ERR38; goto FAILED; } *code++ = n; } previous = NULL; continue; case 'P': /* Named subpattern handling */ if (*(++ptr) == '<') /* Definition */ { int i, namelen; uschar *slot = cd->name_table; const uschar *name; /* Don't amalgamate; some compilers */ name = ++ptr; /* grumble at autoincrement in declaration */ while (*ptr++ != '>'); namelen = ptr - name - 1; for (i = 0; i < cd->names_found; i++) { int crc = memcmp(name, slot+2, namelen); if (crc == 0) { if (slot[2+namelen] == 0) { *errorptr = ERR43; goto FAILED; } crc = -1; /* Current name is substring */ } if (crc < 0) { memmove(slot + cd->name_entry_size, slot, (cd->names_found - i) * cd->name_entry_size); break; } slot += cd->name_entry_size; } PUT2(slot, 0, *brackets + 1); memcpy(slot + 2, name, namelen); slot[2+namelen] = 0; cd->names_found++; goto NUMBERED_GROUP; } if (*ptr == '=' || *ptr == '>') /* Reference or recursion */ { int i, namelen; int type = *ptr++; const uschar *name = ptr; uschar *slot = cd->name_table; while (*ptr != ')') ptr++; namelen = ptr - name; for (i = 0; i < cd->names_found; i++) { if (strncmp((const char *)name, (const char *)slot+2, namelen) == 0) break; slot += cd->name_entry_size; } if (i >= cd->names_found) { *errorptr = ERR15; goto FAILED; } recno = GET2(slot, 0); if (type == '>') goto HANDLE_RECURSION; /* A few lines below */ /* Back reference */ previous = code; *code++ = OP_REF; PUT2INC(code, 0, recno); cd->backref_map |= (recno < 32)? (1 << recno) : 1; if (recno > cd->top_backref) cd->top_backref = recno; continue; } /* Should never happen */ break; case 'R': /* Pattern recursion */ ptr++; /* Same as (?0) */ /* Fall through */ /* Recursion or "subroutine" call */ case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { const uschar *called; recno = 0; while ((cd->ctypes[*ptr] & ctype_digit) != 0) recno = recno * 10 + *ptr++ - '0'; /* Come here from code above that handles a named recursion */ HANDLE_RECURSION: previous = code; /* Find the bracket that is being referenced. Temporarily end the regex in case it doesn't exist. */ *code = OP_END; called = (recno == 0)? cd->start_code : find_bracket(cd->start_code, utf8, recno); if (called == NULL) { *errorptr = ERR15; goto FAILED; } /* If the subpattern is still open, this is a recursive call. We check to see if this is a left recursion that could loop for ever, and diagnose that case. */ if (GET(called, 1) == 0 && could_be_empty(called, code, bcptr, utf8)) { *errorptr = ERR40; goto FAILED; } /* Insert the recursion/subroutine item */ *code = OP_RECURSE; PUT(code, 1, called - cd->start_code); code += 1 + LINK_SIZE; } continue; /* Character after (? not specially recognized */ default: /* Option setting */ set = unset = 0; optset = &set; while (*ptr != ')' && *ptr != ':') { switch (*ptr++) { case '-': optset = &unset; break; case 'i': *optset |= PCRE_CASELESS; break; case 'm': *optset |= PCRE_MULTILINE; break; case 's': *optset |= PCRE_DOTALL; break; case 'x': *optset |= PCRE_EXTENDED; break; case 'U': *optset |= PCRE_UNGREEDY; break; case 'X': *optset |= PCRE_EXTRA; break; } } /* Set up the changed option bits, but don't change anything yet. */ newoptions = (options | set) & (~unset); /* If the options ended with ')' this is not the start of a nested group with option changes, so the options change at this level. Compile code to change the ims options if this setting actually changes any of them. We also pass the new setting back so that it can be put at the start of any following branches, and when this group ends (if we are in a group), a resetting item can be compiled. Note that if this item is right at the start of the pattern, the options will have been abstracted and made global, so there will be no change to compile. */ if (*ptr == ')') { if ((options & PCRE_IMS) != (newoptions & PCRE_IMS)) { *code++ = OP_OPT; *code++ = newoptions & PCRE_IMS; } /* Change options at this level, and pass them back for use in subsequent branches. Reset the greedy defaults and the case value for firstbyte and reqbyte. */ *optionsptr = options = newoptions; greedy_default = ((newoptions & PCRE_UNGREEDY) != 0); greedy_non_default = greedy_default ^ 1; req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0; previous = NULL; /* This item can't be repeated */ continue; /* It is complete */ } /* If the options ended with ':' we are heading into a nested group with possible change of options. Such groups are non-capturing and are not assertions of any kind. All we need to do is skip over the ':'; the newoptions value is handled below. */ bravalue = OP_BRA; ptr++; } } /* If PCRE_NO_AUTO_CAPTURE is set, all unadorned brackets become non-capturing and behave like (?:...) brackets */ else if ((options & PCRE_NO_AUTO_CAPTURE) != 0) { bravalue = OP_BRA; } /* Else we have a referencing group; adjust the opcode. If the bracket number is greater than EXTRACT_BASIC_MAX, we set the opcode one higher, and arrange for the true number to follow later, in an OP_BRANUMBER item. */ else { NUMBERED_GROUP: if (++(*brackets) > EXTRACT_BASIC_MAX) { bravalue = OP_BRA + EXTRACT_BASIC_MAX + 1; code[1+LINK_SIZE] = OP_BRANUMBER; PUT2(code, 2+LINK_SIZE, *brackets); skipbytes = 3; } else bravalue = OP_BRA + *brackets; } /* Process nested bracketed re. Assertions may not be repeated, but other kinds can be. We copy code into a non-register variable in order to be able to pass its address because some compilers complain otherwise. Pass in a new setting for the ims options if they have changed. */ previous = (bravalue >= OP_ONCE)? code : NULL; *code = bravalue; tempcode = code; tempreqvary = cd->req_varyopt; /* Save value before bracket */ if (!compile_regex( newoptions, /* The complete new option state */ options & PCRE_IMS, /* The previous ims option state */ brackets, /* Extracting bracket count */ &tempcode, /* Where to put code (updated) */ &ptr, /* Input pointer (updated) */ errorptr, /* Where to put an error message */ (bravalue == OP_ASSERTBACK || bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */ skipbytes, /* Skip over OP_COND/OP_BRANUMBER */ &subfirstbyte, /* For possible first char */ &subreqbyte, /* For possible last char */ bcptr, /* Current branch chain */ cd)) /* Tables block */ goto FAILED; /* At the end of compiling, code is still pointing to the start of the group, while tempcode has been updated to point past the end of the group and any option resetting that may follow it. The pattern pointer (ptr) is on the bracket. */ /* If this is a conditional bracket, check that there are no more than two branches in the group. */ else if (bravalue == OP_COND) { uschar *tc = code; condcount = 0; do { condcount++; tc += GET(tc,1); } while (*tc != OP_KET); if (condcount > 2) { *errorptr = ERR27; goto FAILED; } /* If there is just one branch, we must not make use of its firstbyte or reqbyte, because this is equivalent to an empty second branch. */ if (condcount == 1) subfirstbyte = subreqbyte = REQ_NONE; } /* Handle updating of the required and first characters. Update for normal brackets of all kinds, and conditions with two branches (see code above). If the bracket is followed by a quantifier with zero repeat, we have to back off. Hence the definition of zeroreqbyte and zerofirstbyte outside the main loop so that they can be accessed for the back off. */ zeroreqbyte = reqbyte; zerofirstbyte = firstbyte; groupsetfirstbyte = FALSE; if (bravalue >= OP_BRA || bravalue == OP_ONCE || bravalue == OP_COND) { /* If we have not yet set a firstbyte in this branch, take it from the subpattern, remembering that it was set here so that a repeat of more than one can replicate it as reqbyte if necessary. If the subpattern has no firstbyte, set "none" for the whole branch. In both cases, a zero repeat forces firstbyte to "none". */ if (firstbyte == REQ_UNSET) { if (subfirstbyte >= 0) { firstbyte = subfirstbyte; groupsetfirstbyte = TRUE; } else firstbyte = REQ_NONE; zerofirstbyte = REQ_NONE; } /* If firstbyte was previously set, convert the subpattern's firstbyte into reqbyte if there wasn't one, using the vary flag that was in existence beforehand. */ else if (subfirstbyte >= 0 && subreqbyte < 0) subreqbyte = subfirstbyte | tempreqvary; /* If the subpattern set a required byte (or set a first byte that isn't really the first byte - see above), set it. */ if (subreqbyte >= 0) reqbyte = subreqbyte; } /* For a forward assertion, we take the reqbyte, if set. This can be helpful if the pattern that follows the assertion doesn't set a different char. For example, it's useful for /(?=abcde).+/. We can't set firstbyte for an assertion, however because it leads to incorrect effect for patterns such as /(?=a)a.+/ when the "real" "a" would then become a reqbyte instead of a firstbyte. This is overcome by a scan at the end if there's no firstbyte, looking for an asserted first char. */ else if (bravalue == OP_ASSERT && subreqbyte >= 0) reqbyte = subreqbyte; /* Now update the main code pointer to the end of the group. */ code = tempcode; /* Error if hit end of pattern */ if (*ptr != ')') { *errorptr = ERR14; goto FAILED; } break; /* Check \ for being a real metacharacter; if not, fall through and handle it as a data character at the start of a string. Escape items are checked for validity in the pre-compiling pass. */ case '\\': tempptr = ptr; c = check_escape(&ptr, errorptr, *brackets, options, FALSE, cd); /* Handle metacharacters introduced by \. For ones like \d, the ESC_ values are arranged to be the negation of the corresponding OP_values. For the back references, the values are ESC_REF plus the reference number. Only back references and those types that consume a character may be repeated. We can test for values between ESC_b and ESC_Z for the latter; this may have to change if any new ones are ever created. */ if (c < 0) { if (-c == ESC_Q) /* Handle start of quoted string */ { if (ptr[1] == '\\' && ptr[2] == 'E') ptr += 2; /* avoid empty string */ else inescq = TRUE; continue; } /* For metasequences that actually match a character, we disable the setting of a first character if it hasn't already been set. */ if (firstbyte == REQ_UNSET && -c > ESC_b && -c < ESC_Z) firstbyte = REQ_NONE; /* Set values to reset to if this is followed by a zero repeat. */ zerofirstbyte = firstbyte; zeroreqbyte = reqbyte; /* Back references are handled specially */ if (-c >= ESC_REF) { int number = -c - ESC_REF; previous = code; *code++ = OP_REF; PUT2INC(code, 0, number); } else { previous = (-c > ESC_b && -c < ESC_Z)? code : NULL; *code++ = -c; } continue; } /* Data character: reset and fall through */ ptr = tempptr; c = '\\'; /* Handle a run of data characters until a metacharacter is encountered. The first character is guaranteed not to be whitespace or # when the extended flag is set. */ NORMAL_CHAR: default: previous = code; *code = OP_CHARS; code += 2; length = 0; do { /* If in \Q...\E, check for the end; if not, we always have a literal */ if (inescq) { if (c == '\\' && ptr[1] == 'E') { inescq = FALSE; ptr++; } else { *code++ = c; length++; } continue; } /* Skip white space and comments for /x patterns */ if ((options & PCRE_EXTENDED) != 0) { if ((cd->ctypes[c] & ctype_space) != 0) continue; if (c == '#') { /* The space before the ; is to avoid a warning on a silly compiler on the Macintosh. */ while ((c = *(++ptr)) != 0 && c != NEWLINE) ; if (c == 0) break; continue; } } /* Backslash may introduce a data char or a metacharacter. Escaped items are checked for validity in the pre-compiling pass. Stop the string before a metaitem. */ if (c == '\\') { tempptr = ptr; c = check_escape(&ptr, errorptr, *brackets, options, FALSE, cd); if (c < 0) { ptr = tempptr; break; } /* If a character is > 127 in UTF-8 mode, we have to turn it into two or more characters in the UTF-8 encoding. */ #ifdef SUPPORT_UTF8 if (utf8 && c > 127) { uschar buffer[8]; int len = ord2utf8(c, buffer); for (c = 0; c < len; c++) *code++ = buffer[c]; length += len; continue; } #endif } /* Ordinary character or single-char escape */ *code++ = c; length++; } /* This "while" is the end of the "do" above. */ while (length < MAXLIT && (cd->ctypes[c = *(++ptr)] & ctype_meta) == 0); /* Update the first and last requirements. These are always bytes, even in UTF-8 mode. However, there is a special case to be considered when there are only one or two characters. Because this gets messy in UTF-8 mode, the code is kept separate. When we get here "length" contains the number of bytes. */ #ifdef SUPPORT_UTF8 if (utf8 && length > 1) { uschar *t = previous + 3; /* After this code, t */ while (t < code && (*t & 0xc0) == 0x80) t++; /* follows the 1st char */ /* Handle the case when there is only one multibyte character. It must have at least two bytes because of the "length > 1" test above. */ if (t == code) { /* If no previous first byte, set it from this character, but revert to none on a zero repeat. */ if (firstbyte == REQ_UNSET) { zerofirstbyte = REQ_NONE; firstbyte = previous[2]; } /* Otherwise, leave the first byte value alone, and don't change it on a zero repeat */ else zerofirstbyte = firstbyte; /* In both cases, a zero repeat resets the previous required byte */ zeroreqbyte = reqbyte; } /* Handle the case when there is more than one character. These may be single-byte or multibyte characters */ else { t = code - 1; /* After this code, t is at the */ while ((*t & 0xc0) == 0x80) t--; /* start of the last character */ /* If no previous first byte, set it from the first character, and retain it on a zero repeat (of the last character). The required byte is reset on a zero repeat, either to the byte before the last character, unless this is the first byte of the string. In that case, it reverts to its previous value. */ if (firstbyte == REQ_UNSET) { zerofirstbyte = firstbyte = previous[2] | req_caseopt; zeroreqbyte = (t - 1 == previous + 2)? reqbyte : t[-1] | req_caseopt | cd->req_varyopt; } /* If there was a previous first byte, leave it alone, and don't change it on a zero repeat. The required byte is reset on a zero repeat to the byte before the last character. */ else { zerofirstbyte = firstbyte; zeroreqbyte = t[-1] | req_caseopt | cd->req_varyopt; } } /* In all cases (we know length > 1), the new required byte is the last byte of the string. */ reqbyte = code[-1] | req_caseopt | cd->req_varyopt; } else /* End of UTF-8 coding */ #endif /* This is the code for non-UTF-8 operation, either without UTF-8 support, or when UTF-8 is not enabled. */ { /* firstbyte was not previously set; take it from this string */ if (firstbyte == REQ_UNSET) { if (length == 1) { zerofirstbyte = REQ_NONE; firstbyte = previous[2] | req_caseopt; zeroreqbyte = reqbyte; } else { zerofirstbyte = firstbyte = previous[2] | req_caseopt; zeroreqbyte = (length > 2)? (code[-2] | req_caseopt | cd->req_varyopt) : reqbyte; reqbyte = code[-1] | req_caseopt | cd->req_varyopt; } } /* firstbyte was previously set */ else { zerofirstbyte = firstbyte; zeroreqbyte = (length == 1)? reqbyte : code[-2] | req_caseopt | cd->req_varyopt; reqbyte = code[-1] | req_caseopt | cd->req_varyopt; } } /* Set the length in the data vector, and advance to the next state. */ previous[1] = length; if (length < MAXLIT) ptr--; break; } } /* end of big loop */ /* Control never reaches here by falling through, only by a goto for all the error states. Pass back the position in the pattern so that it can be displayed to the user for diagnosing the error. */ FAILED: *ptrptr = ptr; return FALSE; } /************************************************* * Compile sequence of alternatives * *************************************************/ /* On entry, ptr is pointing past the bracket character, but on return it points to the closing bracket, or vertical bar, or end of string. The code variable is pointing at the byte into which the BRA operator has been stored. If the ims options are changed at the start (for a (?ims: group) or during any branch, we need to insert an OP_OPT item at the start of every following branch to ensure they get set correctly at run time, and also pass the new options into every subsequent branch compile. Argument: options option bits, including any changes for this subpattern oldims previous settings of ims option bits brackets -> int containing the number of extracting brackets used codeptr -> the address of the current code pointer ptrptr -> the address of the current pattern pointer errorptr -> pointer to error message lookbehind TRUE if this is a lookbehind assertion skipbytes skip this many bytes at start (for OP_COND, OP_BRANUMBER) firstbyteptr place to put the first required character, or a negative number reqbyteptr place to put the last required character, or a negative number bcptr pointer to the chain of currently open branches cd points to the data block with tables pointers etc. Returns: TRUE on success */ static BOOL compile_regex(int options, int oldims, int *brackets, uschar **codeptr, const uschar **ptrptr, const char **errorptr, BOOL lookbehind, int skipbytes, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd) { const uschar *ptr = *ptrptr; uschar *code = *codeptr; uschar *last_branch = code; uschar *start_bracket = code; uschar *reverse_count = NULL; int firstbyte, reqbyte; int branchfirstbyte, branchreqbyte; branch_chain bc; bc.outer = bcptr; bc.current = code; firstbyte = reqbyte = REQ_UNSET; /* Offset is set zero to mark that this bracket is still open */ PUT(code, 1, 0); code += 1 + LINK_SIZE + skipbytes; /* Loop for each alternative branch */ for (;;) { /* Handle a change of ims options at the start of the branch */ if ((options & PCRE_IMS) != oldims) { *code++ = OP_OPT; *code++ = options & PCRE_IMS; } /* Set up dummy OP_REVERSE if lookbehind assertion */ if (lookbehind) { *code++ = OP_REVERSE; reverse_count = code; PUTINC(code, 0, 0); } /* Now compile the branch */ if (!compile_branch(&options, brackets, &code, &ptr, errorptr, &branchfirstbyte, &branchreqbyte, &bc, cd)) { *ptrptr = ptr; return FALSE; } /* If this is the first branch, the firstbyte and reqbyte values for the branch become the values for the regex. */ if (*last_branch != OP_ALT) { firstbyte = branchfirstbyte; reqbyte = branchreqbyte; } /* If this is not the first branch, the first char and reqbyte have to match the values from all the previous branches, except that if the previous value for reqbyte didn't have REQ_VARY set, it can still match, and we set REQ_VARY for the regex. */ else { /* If we previously had a firstbyte, but it doesn't match the new branch, we have to abandon the firstbyte for the regex, but if there was previously no reqbyte, it takes on the value of the old firstbyte. */ if (firstbyte >= 0 && firstbyte != branchfirstbyte) { if (reqbyte < 0) reqbyte = firstbyte; firstbyte = REQ_NONE; } /* If we (now or from before) have no firstbyte, a firstbyte from the branch becomes a reqbyte if there isn't a branch reqbyte. */ if (firstbyte < 0 && branchfirstbyte >= 0 && branchreqbyte < 0) branchreqbyte = branchfirstbyte; /* Now ensure that the reqbytes match */ if ((reqbyte & ~REQ_VARY) != (branchreqbyte & ~REQ_VARY)) reqbyte = REQ_NONE; else reqbyte |= branchreqbyte; /* To "or" REQ_VARY */ } /* If lookbehind, check that this branch matches a fixed-length string, and put the length into the OP_REVERSE item. Temporarily mark the end of the branch with OP_END. */ if (lookbehind) { int length; *code = OP_END; length = find_fixedlength(last_branch, options); DPRINTF(("fixed length = %d\n", length)); if (length < 0) { *errorptr = (length == -2)? ERR36 : ERR25; *ptrptr = ptr; return FALSE; } PUT(reverse_count, 0, length); } /* Reached end of expression, either ')' or end of pattern. Go back through the alternative branches and reverse the chain of offsets, with the field in the BRA item now becoming an offset to the first alternative. If there are no alternatives, it points to the end of the group. The length in the terminating ket is always the length of the whole bracketed item. If any of the ims options were changed inside the group, compile a resetting op-code following, except at the very end of the pattern. Return leaving the pointer at the terminating char. */ if (*ptr != '|') { int length = code - last_branch; do { int prev_length = GET(last_branch, 1); PUT(last_branch, 1, length); length = prev_length; last_branch -= length; } while (length > 0); /* Fill in the ket */ *code = OP_KET; PUT(code, 1, code - start_bracket); code += 1 + LINK_SIZE; /* Resetting option if needed */ if ((options & PCRE_IMS) != oldims && *ptr == ')') { *code++ = OP_OPT; *code++ = oldims; } /* Set values to pass back */ *codeptr = code; *ptrptr = ptr; *firstbyteptr = firstbyte; *reqbyteptr = reqbyte; return TRUE; } /* Another branch follows; insert an "or" node. Its length field points back to the previous branch while the bracket remains open. At the end the chain is reversed. It's done like this so that the start of the bracket has a zero offset until it is closed, making it possible to detect recursion. */ *code = OP_ALT; PUT(code, 1, code - last_branch); bc.current = last_branch = code; code += 1 + LINK_SIZE; ptr++; } /* Control never reaches here */ } /************************************************* * Check for anchored expression * *************************************************/ /* Try to find out if this is an anchored regular expression. Consider each alternative branch. If they all start with OP_SOD or OP_CIRC, or with a bracket all of whose alternatives start with OP_SOD or OP_CIRC (recurse ad lib), then it's anchored. However, if this is a multiline pattern, then only OP_SOD counts, since OP_CIRC can match in the middle. We can also consider a regex to be anchored if OP_SOM starts all its branches. This is the code for \G, which means "match at start of match position, taking into account the match offset". A branch is also implicitly anchored if it starts with .* and DOTALL is set, because that will try the rest of the pattern at all possible matching points, so there is no point trying again.... er .... .... except when the .* appears inside capturing parentheses, and there is a subsequent back reference to those parentheses. We haven't enough information to catch that case precisely. At first, the best we could do was to detect when .* was in capturing brackets and the highest back reference was greater than or equal to that level. However, by keeping a bitmap of the first 31 back references, we can catch some of the more common cases more precisely. Arguments: code points to start of expression (the bracket) options points to the options setting bracket_map a bitmap of which brackets we are inside while testing; this handles up to substring 31; after that we just have to take the less precise approach backref_map the back reference bitmap Returns: TRUE or FALSE */ static BOOL is_anchored(register const uschar *code, int *options, unsigned int bracket_map, unsigned int backref_map) { do { const uschar *scode = first_significant_code(code + 1+LINK_SIZE, options, PCRE_MULTILINE); register int op = *scode; /* Capturing brackets */ if (op > OP_BRA) { int new_map; op -= OP_BRA; if (op > EXTRACT_BASIC_MAX) op = GET2(scode, 2+LINK_SIZE); new_map = bracket_map | ((op < 32)? (1 << op) : 1); if (!is_anchored(scode, options, new_map, backref_map)) return FALSE; } /* Other brackets */ else if (op == OP_BRA || op == OP_ASSERT || op == OP_ONCE || op == OP_COND) { if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE; } /* .* is not anchored unless DOTALL is set and it isn't in brackets that are or may be referenced. */ else if ((op == OP_TYPESTAR || op == OP_TYPEMINSTAR) && (*options & PCRE_DOTALL) != 0) { if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE; } /* Check for explicit anchoring */ else if (op != OP_SOD && op != OP_SOM && ((*options & PCRE_MULTILINE) != 0 || op != OP_CIRC)) return FALSE; code += GET(code, 1); } while (*code == OP_ALT); /* Loop for each alternative */ return TRUE; } /************************************************* * Check for starting with ^ or .* * *************************************************/ /* This is called to find out if every branch starts with ^ or .* so that "first char" processing can be done to speed things up in multiline matching and for non-DOTALL patterns that start with .* (which must start at the beginning or after \n). As in the case of is_anchored() (see above), we have to take account of back references to capturing brackets that contain .* because in that case we can't make the assumption. Arguments: code points to start of expression (the bracket) bracket_map a bitmap of which brackets we are inside while testing; this handles up to substring 31; after that we just have to take the less precise approach backref_map the back reference bitmap Returns: TRUE or FALSE */ static BOOL is_startline(const uschar *code, unsigned int bracket_map, unsigned int backref_map) { do { const uschar *scode = first_significant_code(code + 1+LINK_SIZE, NULL, 0); register int op = *scode; /* Capturing brackets */ if (op > OP_BRA) { int new_map; op -= OP_BRA; if (op > EXTRACT_BASIC_MAX) op = GET2(scode, 2+LINK_SIZE); new_map = bracket_map | ((op < 32)? (1 << op) : 1); if (!is_startline(scode, new_map, backref_map)) return FALSE; } /* Other brackets */ else if (op == OP_BRA || op == OP_ASSERT || op == OP_ONCE || op == OP_COND) { if (!is_startline(scode, bracket_map, backref_map)) return FALSE; } /* .* is not anchored unless DOTALL is set and it isn't in brackets that may be referenced. */ else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR) { if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE; } /* Check for explicit circumflex */ else if (op != OP_CIRC) return FALSE; code += GET(code, 1); } while (*code == OP_ALT); /* Loop for each alternative */ return TRUE; } /************************************************* * Check for asserted fixed first char * *************************************************/ /* During compilation, the "first char" settings from forward assertions are discarded, because they can cause conflicts with actual literals that follow. However, if we end up without a first char setting for an unanchored pattern, it is worth scanning the regex to see if there is an initial asserted first char. If all branches start with the same asserted char, or with a bracket all of whose alternatives start with the same asserted char (recurse ad lib), then we return that char, otherwise -1. Arguments: code points to start of expression (the bracket) options pointer to the options (used to check casing changes) inassert TRUE if in an assertion Returns: -1 or the fixed first char */ static int find_firstassertedchar(const uschar *code, int *options, BOOL inassert) { register int c = -1; do { int d; const uschar *scode = first_significant_code(code + 1+LINK_SIZE, options, PCRE_CASELESS); register int op = *scode; if (op >= OP_BRA) op = OP_BRA; switch(op) { default: return -1; case OP_BRA: case OP_ASSERT: case OP_ONCE: case OP_COND: if ((d = find_firstassertedchar(scode, options, op == OP_ASSERT)) < 0) return -1; if (c < 0) c = d; else if (c != d) return -1; break; case OP_EXACT: /* Fall through */ scode++; case OP_CHARS: /* Fall through */ scode++; case OP_PLUS: case OP_MINPLUS: if (!inassert) return -1; if (c < 0) { c = scode[1]; if ((*options & PCRE_CASELESS) != 0) c |= REQ_CASELESS; } else if (c != scode[1]) return -1; break; } code += GET(code, 1); } while (*code == OP_ALT); return c; } /************************************************* * Compile a Regular Expression * *************************************************/ /* This function takes a string and returns a pointer to a block of store holding a compiled version of the expression. Arguments: pattern the regular expression options various option bits errorptr pointer to pointer to error text erroroffset ptr offset in pattern where error was detected tables pointer to character tables or NULL Returns: pointer to compiled data block, or NULL on error, with errorptr and erroroffset set */ pcre * pcre_compile(const char *pattern, int options, const char **errorptr, int *erroroffset, const unsigned char *tables) { real_pcre *re; int length = 1 + LINK_SIZE; /* For initial BRA plus length */ int runlength; int c, firstbyte, reqbyte; int bracount = 0; int branch_extra = 0; int branch_newextra; int item_count = -1; int name_count = 0; int max_name_size = 0; #ifdef SUPPORT_UTF8 int lastcharlength = 0; BOOL utf8; BOOL class_utf8; #endif BOOL inescq = FALSE; unsigned int brastackptr = 0; size_t size; uschar *code; uschar *codestart; const uschar *ptr; compile_data compile_block; int brastack[BRASTACK_SIZE]; uschar bralenstack[BRASTACK_SIZE]; /* We can't pass back an error message if errorptr is NULL; I guess the best we can do is just return NULL. */ if (errorptr == NULL) return NULL; *errorptr = NULL; /* However, we can give a message for this error */ if (erroroffset == NULL) { *errorptr = ERR16; return NULL; } *erroroffset = 0; /* Can't support UTF8 unless PCRE has been compiled to include the code. */ #ifdef SUPPORT_UTF8 utf8 = (options & PCRE_UTF8) != 0; #else if ((options & PCRE_UTF8) != 0) { *errorptr = ERR32; return NULL; } #endif if ((options & ~PUBLIC_OPTIONS) != 0) { *errorptr = ERR17; return NULL; } /* Set up pointers to the individual character tables */ if (tables == NULL) tables = pcre_default_tables; compile_block.lcc = tables + lcc_offset; compile_block.fcc = tables + fcc_offset; compile_block.cbits = tables + cbits_offset; compile_block.ctypes = tables + ctypes_offset; /* Maximum back reference and backref bitmap. This is updated for numeric references during the first pass, but for named references during the actual compile pass. The bitmap records up to 31 back references to help in deciding whether (.*) can be treated as anchored or not. */ compile_block.top_backref = 0; compile_block.backref_map = 0; /* Reflect pattern for debugging output */ DPRINTF(("------------------------------------------------------------------\n")); DPRINTF(("%s\n", pattern)); /* The first thing to do is to make a pass over the pattern to compute the amount of store required to hold the compiled code. This does not have to be perfect as long as errors are overestimates. At the same time we can detect any flag settings right at the start, and extract them. Make an attempt to correct for any counted white space if an "extended" flag setting appears late in the pattern. We can't be so clever for #-comments. */ ptr = (const uschar *)(pattern - 1); while ((c = *(++ptr)) != 0) { int min, max; int class_optcount; int bracket_length; int duplength; /* If we are inside a \Q...\E sequence, all chars are literal */ if (inescq) goto NORMAL_CHAR; /* Otherwise, first check for ignored whitespace and comments */ if ((options & PCRE_EXTENDED) != 0) { if ((compile_block.ctypes[c] & ctype_space) != 0) continue; if (c == '#') { /* The space before the ; is to avoid a warning on a silly compiler on the Macintosh. */ while ((c = *(++ptr)) != 0 && c != NEWLINE) ; if (c == 0) break; continue; } } item_count++; /* Is zero for the first non-comment item */ switch(c) { /* A backslashed item may be an escaped "normal" character or a character type. For a "normal" character, put the pointers and character back so that tests for whitespace etc. in the input are done correctly. */ case '\\': { const uschar *save_ptr = ptr; c = check_escape(&ptr, errorptr, bracount, options, FALSE, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; if (c >= 0) { ptr = save_ptr; c = '\\'; goto NORMAL_CHAR; } } /* If \Q, enter "literal" mode */ if (-c == ESC_Q) { inescq = TRUE; continue; } /* Other escapes need one byte, and are of length one for repeats */ length++; #ifdef SUPPORT_UTF8 lastcharlength = 1; #endif /* A back reference needs an additional 2 bytes, plus either one or 5 bytes for a repeat. We also need to keep the value of the highest back reference. */ if (c <= -ESC_REF) { int refnum = -c - ESC_REF; compile_block.backref_map |= (refnum < 32)? (1 << refnum) : 1; if (refnum > compile_block.top_backref) compile_block.top_backref = refnum; length += 2; /* For single back reference */ if (ptr[1] == '{' && is_counted_repeat(ptr+2, &compile_block)) { ptr = read_repeat_counts(ptr+2, &min, &max, errorptr, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; if ((min == 0 && (max == 1 || max == -1)) || (min == 1 && max == -1)) length++; else length += 5; if (ptr[1] == '?') ptr++; } } continue; case '^': /* Single-byte metacharacters */ case '.': case '$': length++; #ifdef SUPPORT_UTF8 lastcharlength = 1; #endif continue; case '*': /* These repeats won't be after brackets; */ case '+': /* those are handled separately */ case '?': length++; goto POSESSIVE; /* A few lines below */ /* This covers the cases of braced repeats after a single char, metachar, class, or back reference. */ case '{': if (!is_counted_repeat(ptr+1, &compile_block)) goto NORMAL_CHAR; ptr = read_repeat_counts(ptr+1, &min, &max, errorptr, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; /* These special cases just insert one extra opcode */ if ((min == 0 && (max == 1 || max == -1)) || (min == 1 && max == -1)) length++; /* These cases might insert additional copies of a preceding character. */ else { #ifdef SUPPORT_UTF8 /* In UTF-8 mode, we should find the length in lastcharlength */ if (utf8) { if (min != 1) { length -= lastcharlength; /* Uncount the original char or metachar */ if (min > 0) length += 3 + lastcharlength; } length += lastcharlength + ((max > 0)? 3 : 1); } else #endif /* Not UTF-8 mode: all characters are one byte */ { if (min != 1) { length--; /* Uncount the original char or metachar */ if (min > 0) length += 4; } length += (max > 0)? 4 : 2; } } if (ptr[1] == '?') ptr++; /* Needs no extra length */ POSESSIVE: /* Test for possessive quantifier */ if (ptr[1] == '+') { ptr++; length += 2 + 2*LINK_SIZE; /* Allow for atomic brackets */ } continue; /* An alternation contains an offset to the next branch or ket. If any ims options changed in the previous branch(es), and/or if we are in a lookbehind assertion, extra space will be needed at the start of the branch. This is handled by branch_extra. */ case '|': length += 1 + LINK_SIZE + branch_extra; continue; /* A character class uses 33 characters provided that all the character values are less than 256. Otherwise, it uses a bit map for low valued characters, and individual items for others. Don't worry about character types that aren't allowed in classes - they'll get picked up during the compile. A character class that contains only one single-byte character uses 2 or 3 bytes, depending on whether it is negated or not. Notice this where we can. (In UTF-8 mode we can do this only for chars < 128.) */ case '[': class_optcount = 0; #ifdef SUPPORT_UTF8 class_utf8 = FALSE; #endif if (*(++ptr) == '^') ptr++; /* Written as a "do" so that an initial ']' is taken as data */ if (*ptr != 0) do { /* Inside \Q...\E everything is literal except \E */ if (inescq) { if (*ptr != '\\' || ptr[1] != 'E') goto NON_SPECIAL_CHARACTER; inescq = FALSE; ptr += 1; continue; } /* Outside \Q...\E, check for escapes */ if (*ptr == '\\') { #ifdef SUPPORT_UTF8 int prevchar = ptr[-1]; #endif int ch = check_escape(&ptr, errorptr, bracount, options, TRUE, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; /* \b is backspace inside a class */ if (-ch == ESC_b) ch = '\b'; /* \Q enters quoting mode */ if (-ch == ESC_Q) { inescq = TRUE; continue; } /* Handle escapes that turn into characters */ if (ch >= 0) { #ifdef SUPPORT_UTF8 if (utf8) { if (ch > 127) class_optcount = 10; /* Ensure > 1 */ if (ch > 255) { uschar buffer[6]; if (!class_utf8) { class_utf8 = TRUE; length += LINK_SIZE + 1 + 1; } length += 1 + ord2utf8(ch, buffer); /* If this wide character is preceded by '-', add an extra 2 to the length in case the previous character was < 128, because in this case the whole range will be put into the list. */ if (prevchar == '-') length += 2; } } #endif class_optcount++; /* for possible optimization */ } else class_optcount = 10; /* \d, \s etc; make sure > 1 */ } /* Check the syntax for POSIX stuff. The bits we actually handle are checked during the real compile phase. */ else if (*ptr == '[' && check_posix_syntax(ptr, &ptr, &compile_block)) { ptr++; class_optcount = 10; /* Make sure > 1 */ } /* Anything else just increments the possible optimization count. If there are wide characters, we are going to have to use an XCLASS. */ else { NON_SPECIAL_CHARACTER: class_optcount++; #ifdef SUPPORT_UTF8 if (utf8) { int ch; int extra = 0; GETCHARLEN(ch, ptr, extra); if (ch > 127) class_optcount = 10; /* No optimization possible */ if (ch > 255) { if (!class_utf8) { class_utf8 = TRUE; length += LINK_SIZE + 1 + 1; } length += 2 + extra; /* If this wide character is preceded by '-', add an extra 2 to the length in case the previous character was < 128, because in this case the whole range will be put into the list. */ if (ptr[-1] == '-') length += 2; /* Advance to the end of this character */ ptr += extra; } } #endif } } while (*(++ptr) != 0 && (inescq || *ptr != ']')); /* Concludes "do" above */ if (*ptr == 0) /* Missing terminating ']' */ { *errorptr = ERR6; goto PCRE_ERROR_RETURN; } /* We can optimize when there was only one optimizable character. Repeats for positive and negated single one-byte chars are handled by the general code. Here, we handle repeats for the class opcodes. */ if (class_optcount == 1) length += 3; else { length += 33; /* A repeat needs either 1 or 5 bytes. */ if (*ptr != 0 && ptr[1] == '{' && is_counted_repeat(ptr+2, &compile_block)) { ptr = read_repeat_counts(ptr+2, &min, &max, errorptr, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; if ((min == 0 && (max == 1 || max == -1)) || (min == 1 && max == -1)) length++; else length += 5; if (ptr[1] == '?') ptr++; } } continue; /* Brackets may be genuine groups or special things */ case '(': branch_newextra = 0; bracket_length = 1 + LINK_SIZE; /* Handle special forms of bracket, which all start (? */ if (ptr[1] == '?') { int set, unset; int *optset; switch (c = ptr[2]) { /* Skip over comments entirely */ case '#': ptr += 3; while (*ptr != 0 && *ptr != ')') ptr++; if (*ptr == 0) { *errorptr = ERR18; goto PCRE_ERROR_RETURN; } continue; /* Non-referencing groups and lookaheads just move the pointer on, and then behave like a non-special bracket, except that they don't increment the count of extracting brackets. Ditto for the "once only" bracket, which is in Perl from version 5.005. */ case ':': case '=': case '!': case '>': ptr += 2; break; /* (?R) specifies a recursive call to the regex, which is an extension to provide the facility which can be obtained by (?p{perl-code}) in Perl 5.6. In Perl 5.8 this has become (??{perl-code}). From PCRE 4.00, items such as (?3) specify subroutine-like "calls" to the appropriate numbered brackets. This includes both recursive and non-recursive calls. (?R) is now synonymous with (?0). */ case 'R': ptr++; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': ptr += 2; if (c != 'R') while ((compile_block.ctypes[*(++ptr)] & ctype_digit) != 0); if (*ptr != ')') { *errorptr = ERR29; goto PCRE_ERROR_RETURN; } length += 1 + LINK_SIZE; /* If this item is quantified, it will get wrapped inside brackets so as to use the code for quantified brackets. We jump down and use the code that handles this for real brackets. */ if (ptr[1] == '+' || ptr[1] == '*' || ptr[1] == '?' || ptr[1] == '{') { length += 2 + 2 * LINK_SIZE; /* to make bracketed */ duplength = 5 + 3 * LINK_SIZE; goto HANDLE_QUANTIFIED_BRACKETS; } continue; /* (?C) is an extension which provides "callout" - to provide a bit of the functionality of the Perl (?{...}) feature. An optional number may follow (default is zero). */ case 'C': ptr += 2; while ((compile_block.ctypes[*(++ptr)] & ctype_digit) != 0); if (*ptr != ')') { *errorptr = ERR39; goto PCRE_ERROR_RETURN; } length += 2; continue; /* Named subpatterns are an extension copied from Python */ case 'P': ptr += 3; if (*ptr == '<') { const uschar *p; /* Don't amalgamate; some compilers */ p = ++ptr; /* grumble at autoincrement in declaration */ while ((compile_block.ctypes[*ptr] & ctype_word) != 0) ptr++; if (*ptr != '>') { *errorptr = ERR42; goto PCRE_ERROR_RETURN; } name_count++; if (ptr - p > max_name_size) max_name_size = (ptr - p); break; } if (*ptr == '=' || *ptr == '>') { while ((compile_block.ctypes[*(++ptr)] & ctype_word) != 0); if (*ptr != ')') { *errorptr = ERR42; goto PCRE_ERROR_RETURN; } break; } /* Unknown character after (?P */ *errorptr = ERR41; goto PCRE_ERROR_RETURN; /* Lookbehinds are in Perl from version 5.005 */ case '<': ptr += 3; if (*ptr == '=' || *ptr == '!') { branch_newextra = 1 + LINK_SIZE; length += 1 + LINK_SIZE; /* For the first branch */ break; } *errorptr = ERR24; goto PCRE_ERROR_RETURN; /* Conditionals are in Perl from version 5.005. The bracket must either be followed by a number (for bracket reference) or by an assertion group, or (a PCRE extension) by 'R' for a recursion test. */ case '(': if (ptr[3] == 'R' && ptr[4] == ')') { ptr += 4; length += 3; } else if ((compile_block.ctypes[ptr[3]] & ctype_digit) != 0) { ptr += 4; length += 3; while ((compile_block.ctypes[*ptr] & ctype_digit) != 0) ptr++; if (*ptr != ')') { *errorptr = ERR26; goto PCRE_ERROR_RETURN; } } else /* An assertion must follow */ { ptr++; /* Can treat like ':' as far as spacing is concerned */ if (ptr[2] != '?' || (ptr[3] != '=' && ptr[3] != '!' && ptr[3] != '<') ) { ptr += 2; /* To get right offset in message */ *errorptr = ERR28; goto PCRE_ERROR_RETURN; } } break; /* Else loop checking valid options until ) is met. Anything else is an error. If we are without any brackets, i.e. at top level, the settings act as if specified in the options, so massage the options immediately. This is for backward compatibility with Perl 5.004. */ default: set = unset = 0; optset = &set; ptr += 2; for (;; ptr++) { c = *ptr; switch (c) { case 'i': *optset |= PCRE_CASELESS; continue; case 'm': *optset |= PCRE_MULTILINE; continue; case 's': *optset |= PCRE_DOTALL; continue; case 'x': *optset |= PCRE_EXTENDED; continue; case 'X': *optset |= PCRE_EXTRA; continue; case 'U': *optset |= PCRE_UNGREEDY; continue; case '-': optset = &unset; continue; /* A termination by ')' indicates an options-setting-only item; if this is at the very start of the pattern (indicated by item_count being zero), we use it to set the global options. This is helpful when analyzing the pattern for first characters, etc. Otherwise nothing is done here and it is handled during the compiling process. [Historical note: Up to Perl 5.8, options settings at top level were always global settings, wherever they appeared in the pattern. That is, they were equivalent to an external setting. From 5.8 onwards, they apply only to what follows (which is what you might expect).] */ case ')': if (item_count == 0) { options = (options | set) & (~unset); set = unset = 0; /* To save length */ item_count--; /* To allow for several */ } /* Fall through */ /* A termination by ':' indicates the start of a nested group with the given options set. This is again handled at compile time, but we must allow for compiled space if any of the ims options are set. We also have to allow for resetting space at the end of the group, which is why 4 is added to the length and not just 2. If there are several changes of options within the same group, this will lead to an over-estimate on the length, but this shouldn't matter very much. We also have to allow for resetting options at the start of any alternations, which we do by setting branch_newextra to 2. Finally, we record whether the case-dependent flag ever changes within the regex. This is used by the "required character" code. */ case ':': if (((set|unset) & PCRE_IMS) != 0) { length += 4; branch_newextra = 2; if (((set|unset) & PCRE_CASELESS) != 0) options |= PCRE_ICHANGED; } goto END_OPTIONS; /* Unrecognized option character */ default: *errorptr = ERR12; goto PCRE_ERROR_RETURN; } } /* If we hit a closing bracket, that's it - this is a freestanding option-setting. We need to ensure that branch_extra is updated if necessary. The only values branch_newextra can have here are 0 or 2. If the value is 2, then branch_extra must either be 2 or 5, depending on whether this is a lookbehind group or not. */ END_OPTIONS: if (c == ')') { if (branch_newextra == 2 && (branch_extra == 0 || branch_extra == 1+LINK_SIZE)) branch_extra += branch_newextra; continue; } /* If options were terminated by ':' control comes here. Fall through to handle the group below. */ } } /* Extracting brackets must be counted so we can process escapes in a Perlish way. If the number exceeds EXTRACT_BASIC_MAX we are going to need an additional 3 bytes of store per extracting bracket. However, if PCRE_NO_AUTO)CAPTURE is set, unadorned brackets become non-capturing, so we must leave the count alone (it will aways be zero). */ else if ((options & PCRE_NO_AUTO_CAPTURE) == 0) { bracount++; if (bracount > EXTRACT_BASIC_MAX) bracket_length += 3; } /* Save length for computing whole length at end if there's a repeat that requires duplication of the group. Also save the current value of branch_extra, and start the new group with the new value. If non-zero, this will either be 2 for a (?imsx: group, or 3 for a lookbehind assertion. */ if (brastackptr >= sizeof(brastack)/sizeof(int)) { *errorptr = ERR19; goto PCRE_ERROR_RETURN; } bralenstack[brastackptr] = branch_extra; branch_extra = branch_newextra; brastack[brastackptr++] = length; length += bracket_length; continue; /* Handle ket. Look for subsequent max/min; for certain sets of values we have to replicate this bracket up to that many times. If brastackptr is 0 this is an unmatched bracket which will generate an error, but take care not to try to access brastack[-1] when computing the length and restoring the branch_extra value. */ case ')': length += 1 + LINK_SIZE; if (brastackptr > 0) { duplength = length - brastack[--brastackptr]; branch_extra = bralenstack[brastackptr]; } else duplength = 0; /* The following code is also used when a recursion such as (?3) is followed by a quantifier, because in that case, it has to be wrapped inside brackets so that the quantifier works. The value of duplength must be set before arrival. */ HANDLE_QUANTIFIED_BRACKETS: /* Leave ptr at the final char; for read_repeat_counts this happens automatically; for the others we need an increment. */ if ((c = ptr[1]) == '{' && is_counted_repeat(ptr+2, &compile_block)) { ptr = read_repeat_counts(ptr+2, &min, &max, errorptr, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; } else if (c == '*') { min = 0; max = -1; ptr++; } else if (c == '+') { min = 1; max = -1; ptr++; } else if (c == '?') { min = 0; max = 1; ptr++; } else { min = 1; max = 1; } /* If the minimum is zero, we have to allow for an OP_BRAZERO before the group, and if the maximum is greater than zero, we have to replicate maxval-1 times; each replication acquires an OP_BRAZERO plus a nesting bracket set. */ if (min == 0) { length++; if (max > 0) length += (max - 1) * (duplength + 3 + 2*LINK_SIZE); } /* When the minimum is greater than zero, we have to replicate up to minval-1 times, with no additions required in the copies. Then, if there is a limited maximum we have to replicate up to maxval-1 times allowing for a BRAZERO item before each optional copy and nesting brackets for all but one of the optional copies. */ else { length += (min - 1) * duplength; if (max > min) /* Need this test as max=-1 means no limit */ length += (max - min) * (duplength + 3 + 2*LINK_SIZE) - (2 + 2*LINK_SIZE); } /* Allow space for once brackets for "possessive quantifier" */ if (ptr[1] == '+') { ptr++; length += 2 + 2*LINK_SIZE; } continue; /* Non-special character. For a run of such characters the length required is the number of characters + 2, except that the maximum run length is MAXLIT. We won't get a skipped space or a non-data escape or the start of a # comment as the first character, so the length can't be zero. */ NORMAL_CHAR: default: length += 2; runlength = 0; do { #ifdef SUPPORT_UTF8 lastcharlength = 1; /* Need length of last char for UTF-8 repeats */ #endif /* If in a \Q...\E sequence, check for end; otherwise it's a literal */ if (inescq) { if (c == '\\' && ptr[1] == 'E') { inescq = FALSE; ptr++; } else runlength++; continue; } /* Skip whitespace and comments for /x */ if ((options & PCRE_EXTENDED) != 0) { if ((compile_block.ctypes[c] & ctype_space) != 0) continue; if (c == '#') { /* The space before the ; is to avoid a warning on a silly compiler on the Macintosh. */ while ((c = *(++ptr)) != 0 && c != NEWLINE) ; continue; } } /* Backslash may introduce a data char or a metacharacter; stop the string before the latter. */ if (c == '\\') { const uschar *saveptr = ptr; c = check_escape(&ptr, errorptr, bracount, options, FALSE, &compile_block); if (*errorptr != NULL) goto PCRE_ERROR_RETURN; if (c < 0) { ptr = saveptr; break; } /* In UTF-8 mode, add on the number of additional bytes needed to encode this character, and save the total length in case this is a final char that is repeated. */ #ifdef SUPPORT_UTF8 if (utf8 && c > 127) { int i; for (i = 0; i < sizeof(utf8_table1)/sizeof(int); i++) if (c <= utf8_table1[i]) break; runlength += i; lastcharlength += i; } #endif } /* Ordinary character or single-char escape */ runlength++; } /* This "while" is the end of the "do" above. */ while (runlength < MAXLIT && (compile_block.ctypes[c = *(++ptr)] & ctype_meta) == 0); /* If we hit a meta-character, back off to point to it */ if (runlength < MAXLIT) ptr--; /* If the last char in the string is a UTF-8 multibyte character, we must set lastcharlength correctly. If it was specified as an escape, this will already have been done above. However, we also have to support in-line UTF-8 characters, so check backwards from where we are. */ #ifdef SUPPORT_UTF8 if (utf8) { const uschar *lastptr = ptr - 1; if ((*lastptr & 0x80) != 0) { while ((*lastptr & 0xc0) == 0x80) lastptr--; lastcharlength = ptr - lastptr; } } #endif length += runlength; continue; } } length += 2 + LINK_SIZE; /* For final KET and END */ if (length > MAX_PATTERN_SIZE) { *errorptr = ERR20; return NULL; } /* Compute the size of data block needed and get it, either from malloc or externally provided function. */ size = length + sizeof(real_pcre) + name_count * (max_name_size + 3); re = (real_pcre *)(pcre_malloc)(size); if (re == NULL) { *errorptr = ERR21; return NULL; } /* Put in the magic number, and save the size, options, and table pointer */ re->magic_number = MAGIC_NUMBER; re->size = size; re->options = options; re->tables = tables; re->name_entry_size = max_name_size + 3; re->name_count = name_count; /* The starting points of the name/number translation table and of the code are passed around in the compile data block. */ compile_block.names_found = 0; compile_block.name_entry_size = max_name_size + 3; compile_block.name_table = (uschar *)re + sizeof(real_pcre); codestart = compile_block.name_table + re->name_entry_size * re->name_count; compile_block.start_code = codestart; compile_block.req_varyopt = 0; /* Set up a starting, non-extracting bracket, then compile the expression. On error, *errorptr will be set non-NULL, so we don't need to look at the result of the function here. */ ptr = (const uschar *)pattern; code = (uschar *)codestart; *code = OP_BRA; bracount = 0; (void)compile_regex(options, options & PCRE_IMS, &bracount, &code, &ptr, errorptr, FALSE, 0, &firstbyte, &reqbyte, NULL, &compile_block); re->top_bracket = bracount; re->top_backref = compile_block.top_backref; /* If not reached end of pattern on success, there's an excess bracket. */ if (*errorptr == NULL && *ptr != 0) *errorptr = ERR22; /* Fill in the terminating state and check for disastrous overflow, but if debugging, leave the test till after things are printed out. */ *code++ = OP_END; #ifndef DEBUG if (code - codestart > length) *errorptr = ERR23; #endif /* Give an error if there's back reference to a non-existent capturing subpattern. */ if (re->top_backref > re->top_bracket) *errorptr = ERR15; /* Failed to compile, or error while post-processing */ if (*errorptr != NULL) { (pcre_free)(re); PCRE_ERROR_RETURN: *erroroffset = ptr - (const uschar *)pattern; return NULL; } /* If the anchored option was not passed, set the flag if we can determine that the pattern is anchored by virtue of ^ characters or \A or anything else (such as starting with .* when DOTALL is set). Otherwise, if we know what the first character has to be, save it, because that speeds up unanchored matches no end. If not, see if we can set the PCRE_STARTLINE flag. This is helpful for multiline matches when all branches start with ^. and also when all branches start with .* for non-DOTALL matches. */ if ((options & PCRE_ANCHORED) == 0) { int temp_options = options; if (is_anchored(codestart, &temp_options, 0, compile_block.backref_map)) re->options |= PCRE_ANCHORED; else { if (firstbyte < 0) firstbyte = find_firstassertedchar(codestart, &temp_options, FALSE); if (firstbyte >= 0) /* Remove caseless flag for non-caseable chars */ { int ch = firstbyte & 255; re->first_byte = ((firstbyte & REQ_CASELESS) != 0 && compile_block.fcc[ch] == ch)? ch : firstbyte; re->options |= PCRE_FIRSTSET; } else if (is_startline(codestart, 0, compile_block.backref_map)) re->options |= PCRE_STARTLINE; } } /* For an anchored pattern, we use the "required byte" only if it follows a variable length item in the regex. Remove the caseless flag for non-caseable chars. */ if (reqbyte >= 0 && ((re->options & PCRE_ANCHORED) == 0 || (reqbyte & REQ_VARY) != 0)) { int ch = reqbyte & 255; re->req_byte = ((reqbyte & REQ_CASELESS) != 0 && compile_block.fcc[ch] == ch)? (reqbyte & ~REQ_CASELESS) : reqbyte; re->options |= PCRE_REQCHSET; } /* Print out the compiled data for debugging */ #ifdef DEBUG printf("Length = %d top_bracket = %d top_backref = %d\n", length, re->top_bracket, re->top_backref); if (re->options != 0) { printf("%s%s%s%s%s%s%s%s%s\n", ((re->options & PCRE_ANCHORED) != 0)? "anchored " : "", ((re->options & PCRE_CASELESS) != 0)? "caseless " : "", ((re->options & PCRE_ICHANGED) != 0)? "case state changed " : "", ((re->options & PCRE_EXTENDED) != 0)? "extended " : "", ((re->options & PCRE_MULTILINE) != 0)? "multiline " : "", ((re->options & PCRE_DOTALL) != 0)? "dotall " : "", ((re->options & PCRE_DOLLAR_ENDONLY) != 0)? "endonly " : "", ((re->options & PCRE_EXTRA) != 0)? "extra " : "", ((re->options & PCRE_UNGREEDY) != 0)? "ungreedy " : ""); } if ((re->options & PCRE_FIRSTSET) != 0) { int ch = re->first_byte & 255; char *caseless = ((re->first_byte & REQ_CASELESS) == 0)? "" : " (caseless)"; if (isprint(ch)) printf("First char = %c%s\n", ch, caseless); else printf("First char = \\x%02x%s\n", ch, caseless); } if ((re->options & PCRE_REQCHSET) != 0) { int ch = re->req_byte & 255; char *caseless = ((re->req_byte & REQ_CASELESS) == 0)? "" : " (caseless)"; if (isprint(ch)) printf("Req char = %c%s\n", ch, caseless); else printf("Req char = \\x%02x%s\n", ch, caseless); } print_internals(re, stdout); /* This check is done here in the debugging case so that the code that was compiled can be seen. */ if (code - codestart > length) { *errorptr = ERR23; (pcre_free)(re); *erroroffset = ptr - (uschar *)pattern; return NULL; } #endif return (pcre *)re; } /************************************************* * Match a back-reference * *************************************************/ /* If a back reference hasn't been set, the length that is passed is greater than the number of characters left in the string, so the match fails. Arguments: offset index into the offset vector eptr points into the subject length length to be matched md points to match data block ims the ims flags Returns: TRUE if matched */ static BOOL match_ref(int offset, register const uschar *eptr, int length, match_data *md, unsigned long int ims) { const uschar *p = md->start_subject + md->offset_vector[offset]; #ifdef DEBUG if (eptr >= md->end_subject) printf("matching subject "); else { printf("matching subject "); pchars(eptr, length, TRUE, md); } printf(" against backref "); pchars(p, length, FALSE, md); printf("\n"); #endif /* Always fail if not enough characters left */ if (length > md->end_subject - eptr) return FALSE; /* Separate the caselesss case for speed */ if ((ims & PCRE_CASELESS) != 0) { while (length-- > 0) if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE; } else { while (length-- > 0) if (*p++ != *eptr++) return FALSE; } return TRUE; } #ifdef SUPPORT_UTF8 /************************************************* * Match character against an XCLASS * *************************************************/ /* This function is called from within the XCLASS code below, to match a character against an extended class which might match values > 255. Arguments: c the character data points to the flag byte of the XCLASS data Returns: TRUE if character matches, else FALSE */ static BOOL match_xclass(int c, const uschar *data) { int t; BOOL negated = (*data & XCL_NOT) != 0; /* Character values < 256 are matched against a bitmap, if one is present. If not, we still carry on, because there may be ranges that start below 256 in the additional data. */ if (c < 256) { if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0) return !negated; /* char found */ } /* Now match against the list of large chars or ranges that end with a large char. First skip the bit map if present. */ if ((*data++ & XCL_MAP) != 0) data += 32; while ((t = *data++) != XCL_END) { int x, y; GETCHARINC(x, data); if (t == XCL_SINGLE) { if (c == x) return !negated; } else { GETCHARINC(y, data); if (c >= x && c <= y) return !negated; } } return negated; /* char was not found */ } #endif /************************************************* * Match from current position * *************************************************/ /* On entry ecode points to the first opcode, and eptr to the first character in the subject string, while eptrb holds the value of eptr at the start of the last bracketed group - used for breaking infinite loops matching zero-length strings. This function is called recursively in many circumstances. Whenever it returns a negative (error) response, the outer incarnation must also return the same response. Performance note: It might be tempting to extract commonly used fields from the md structure (e.g. utf8, end_subject) into individual variables to improve performance. Tests using gcc on a SPARC disproved this; in the first case, it made performance worse. Arguments: eptr pointer in subject ecode position in code offset_top current top pointer md pointer to "static" info for the match ims current /i, /m, and /s options eptrb pointer to chain of blocks containing eptr at start of brackets - for testing for empty matches flags can contain match_condassert - this is an assertion condition match_isgroup - this is the start of a bracketed group Returns: MATCH_MATCH if matched ) these values are >= 0 MATCH_NOMATCH if failed to match ) a negative PCRE_ERROR_xxx value if aborted by an error condition (e.g. stopped by recursion limit) */ static int match(register const uschar *eptr, register const uschar *ecode, int offset_top, match_data *md, unsigned long int ims, eptrblock *eptrb, int flags) { unsigned long int original_ims = ims; /* Save for resetting on ')' */ register int rrc; eptrblock newptrb; if (md->match_call_count++ >= md->match_limit) return PCRE_ERROR_MATCHLIMIT; /* At the start of a bracketed group, add the current subject pointer to the stack of such pointers, to be re-instated at the end of the group when we hit the closing ket. When match() is called in other circumstances, we don't add to the stack. */ if ((flags & match_isgroup) != 0) { newptrb.prev = eptrb; newptrb.saved_eptr = eptr; eptrb = &newptrb; } /* Now start processing the operations. */ for (;;) { int op = (int)*ecode; int min, max, ctype; register int i; register int c; BOOL minimize = FALSE; /* Opening capturing bracket. If there is space in the offset vector, save the current subject position in the working slot at the top of the vector. We mustn't change the current values of the data slot, because they may be set from a previous iteration of this group, and be referred to by a reference inside the group. If the bracket fails to match, we need to restore this value and also the values of the final offsets, in case they were set by a previous iteration of the same bracket. If there isn't enough space in the offset vector, treat this as if it were a non-capturing bracket. Don't worry about setting the flag for the error case here; that is handled in the code for KET. */ if (op > OP_BRA) { int offset; int number = op - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (number > EXTRACT_BASIC_MAX) number = GET2(ecode, 2+LINK_SIZE); offset = number << 1; #ifdef DEBUG printf("start bracket %d subject=", number); pchars(eptr, 16, TRUE, md); printf("\n"); #endif if (offset < md->offset_max) { int save_offset1 = md->offset_vector[offset]; int save_offset2 = md->offset_vector[offset+1]; int save_offset3 = md->offset_vector[md->offset_end - number]; int save_capture_last = md->capture_last; DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3)); md->offset_vector[md->offset_end - number] = eptr - md->start_subject; do { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; md->capture_last = save_capture_last; ecode += GET(ecode, 1); } while (*ecode == OP_ALT); DPRINTF(("bracket %d failed\n", number)); md->offset_vector[offset] = save_offset1; md->offset_vector[offset+1] = save_offset2; md->offset_vector[md->offset_end - number] = save_offset3; return MATCH_NOMATCH; } /* Insufficient room for saving captured contents */ else op = OP_BRA; } /* Other types of node can be handled by a switch */ switch(op) { case OP_BRA: /* Non-capturing bracket: optimized */ DPRINTF(("start bracket 0\n")); do { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; ecode += GET(ecode, 1); } while (*ecode == OP_ALT); DPRINTF(("bracket 0 failed\n")); return MATCH_NOMATCH; /* Conditional group: compilation checked that there are no more than two branches. If the condition is false, skipping the first branch takes us past the end if there is only one branch, but that's OK because that is exactly what going to the ket would do. */ case OP_COND: if (ecode[LINK_SIZE+1] == OP_CREF) /* Condition extract or recurse test */ { int offset = GET2(ecode, LINK_SIZE+2) << 1; /* Doubled ref number */ BOOL condition = (offset == CREF_RECURSE * 2)? (md->recursive != NULL) : (offset < offset_top && md->offset_vector[offset] >= 0); return match(eptr, ecode + (condition? (LINK_SIZE + 4) : (LINK_SIZE + 1 + GET(ecode, 1))), offset_top, md, ims, eptrb, match_isgroup); } /* The condition is an assertion. Call match() to evaluate it - setting the final argument TRUE causes it to stop at the end of an assertion. */ else { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_condassert | match_isgroup)) == MATCH_MATCH) { ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE+2); while (*ecode == OP_ALT) ecode += GET(ecode, 1); } else if (rrc != MATCH_NOMATCH) return rrc; else ecode += GET(ecode, 1); return match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); } /* Control never reaches here */ /* Skip over conditional reference or large extraction number data if encountered. */ case OP_CREF: case OP_BRANUMBER: ecode += 3; break; /* End of the pattern. If we are in a recursion, we should restore the offsets appropriately and continue from after the call. */ case OP_END: if (md->recursive != NULL && md->recursive->group_num == 0) { recursion_info *rec = md->recursive; DPRINTF(("Hit the end in a (?0) recursion\n")); md->recursive = rec->prev; memmove(md->offset_vector, rec->offset_save, rec->saved_max * sizeof(int)); md->start_match = rec->save_start; ims = original_ims; ecode = rec->after_call; break; } /* Otherwise, if PCRE_NOTEMPTY is set, fail if we have matched an empty string - backtracking will then try other alternatives, if any. */ if (md->notempty && eptr == md->start_match) return MATCH_NOMATCH; md->end_match_ptr = eptr; /* Record where we ended */ md->end_offset_top = offset_top; /* and how many extracts were taken */ return MATCH_MATCH; /* Change option settings */ case OP_OPT: ims = ecode[1]; ecode += 2; DPRINTF(("ims set to %02lx\n", ims)); break; /* Assertion brackets. Check the alternative branches in turn - the matching won't pass the KET for an assertion. If any one branch matches, the assertion is true. Lookbehind assertions have an OP_REVERSE item at the start of each branch to move the current point backwards, so the code at this level is identical to the lookahead case. */ case OP_ASSERT: case OP_ASSERTBACK: do { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_isgroup)) == MATCH_MATCH) break; if (rrc != MATCH_NOMATCH) return rrc; ecode += GET(ecode, 1); } while (*ecode == OP_ALT); if (*ecode == OP_KET) return MATCH_NOMATCH; /* If checking an assertion for a condition, return MATCH_MATCH. */ if ((flags & match_condassert) != 0) return MATCH_MATCH; /* Continue from after the assertion, updating the offsets high water mark, since extracts may have been taken during the assertion. */ do ecode += GET(ecode,1); while (*ecode == OP_ALT); ecode += 1 + LINK_SIZE; offset_top = md->end_offset_top; continue; /* Negative assertion: all branches must fail to match */ case OP_ASSERT_NOT: case OP_ASSERTBACK_NOT: do { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_isgroup)) == MATCH_MATCH) return MATCH_NOMATCH; if (rrc != MATCH_NOMATCH) return rrc; ecode += GET(ecode,1); } while (*ecode == OP_ALT); if ((flags & match_condassert) != 0) return MATCH_MATCH; ecode += 1 + LINK_SIZE; continue; /* Move the subject pointer back. This occurs only at the start of each branch of a lookbehind assertion. If we are too close to the start to move back, this match function fails. When working with UTF-8 we move back a number of characters, not bytes. */ case OP_REVERSE: #ifdef SUPPORT_UTF8 c = GET(ecode,1); for (i = 0; i < c; i++) { eptr--; BACKCHAR(eptr) } #else eptr -= GET(ecode,1); #endif if (eptr < md->start_subject) return MATCH_NOMATCH; ecode += 1 + LINK_SIZE; break; /* The callout item calls an external function, if one is provided, passing details of the match so far. This is mainly for debugging, though the function is able to force a failure. */ case OP_CALLOUT: if (pcre_callout != NULL) { pcre_callout_block cb; cb.version = 0; /* Version 0 of the callout block */ cb.callout_number = ecode[1]; cb.offset_vector = md->offset_vector; cb.subject = (const char *)md->start_subject; cb.subject_length = md->end_subject - md->start_subject; cb.start_match = md->start_match - md->start_subject; cb.current_position = eptr - md->start_subject; cb.capture_top = offset_top/2; cb.capture_last = md->capture_last; cb.callout_data = md->callout_data; if ((rrc = (*pcre_callout)(&cb)) > 0) return MATCH_NOMATCH; if (rrc < 0) return rrc; } ecode += 2; break; /* Recursion either matches the current regex, or some subexpression. The offset data is the offset to the starting bracket from the start of the whole pattern. However, it is possible that a BRAZERO was inserted before this bracket after we took the offset - we just skip it if encountered. If there are any capturing brackets started but not finished, we have to save their starting points and reinstate them after the recursion. However, we don't know how many such there are (offset_top records the completed total) so we just have to save all the potential data. There may be up to 65535 such values, which is too large to put on the stack, but using malloc for small numbers seems expensive. As a compromise, the stack is used when there are no more than REC_STACK_SAVE_MAX values to store; otherwise malloc is used. A problem is what to do if the malloc fails ... there is no way of returning to the top level with an error. Save the top REC_STACK_SAVE_MAX values on the stack, and accept that the rest may be wrong. There are also other values that have to be saved. We use a chained sequence of blocks that actually live on the stack. Thanks to Robin Houston for the original version of this logic. */ case OP_RECURSE: { int stacksave[REC_STACK_SAVE_MAX]; recursion_info new_recursive; const uschar *callpat = md->start_code + GET(ecode, 1); if (*callpat == OP_BRAZERO) callpat++; new_recursive.group_num = *callpat - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (new_recursive.group_num > EXTRACT_BASIC_MAX) new_recursive.group_num = GET2(callpat, 2+LINK_SIZE); /* Add to "recursing stack" */ new_recursive.prev = md->recursive; md->recursive = &new_recursive; /* Find where to continue from afterwards */ ecode += 1 + LINK_SIZE; new_recursive.after_call = ecode; /* Now save the offset data. */ new_recursive.saved_max = md->offset_end; if (new_recursive.saved_max <= REC_STACK_SAVE_MAX) new_recursive.offset_save = stacksave; else { new_recursive.offset_save = (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int)); if (new_recursive.offset_save == NULL) return PCRE_ERROR_NOMEMORY; } memcpy(new_recursive.offset_save, md->offset_vector, new_recursive.saved_max * sizeof(int)); new_recursive.save_start = md->start_match; md->start_match = eptr; /* OK, now we can do the recursion. For each top-level alternative we restore the offset and recursion data. */ DPRINTF(("Recursing into group %d\n", new_recursive.group_num)); do { if ((rrc = match(eptr, callpat + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup)) == MATCH_MATCH) { md->recursive = new_recursive.prev; if (new_recursive.offset_save != stacksave) (pcre_free)(new_recursive.offset_save); return MATCH_MATCH; } else if (rrc != MATCH_NOMATCH) return rrc; md->recursive = &new_recursive; memcpy(md->offset_vector, new_recursive.offset_save, new_recursive.saved_max * sizeof(int)); callpat += GET(callpat, 1); } while (*callpat == OP_ALT); DPRINTF(("Recursion didn't match\n")); md->recursive = new_recursive.prev; if (new_recursive.offset_save != stacksave) (pcre_free)(new_recursive.offset_save); return MATCH_NOMATCH; } /* Control never reaches here */ /* "Once" brackets are like assertion brackets except that after a match, the point in the subject string is not moved back. Thus there can never be a move back into the brackets. Friedl calls these "atomic" subpatterns. Check the alternative branches in turn - the matching won't pass the KET for this kind of subpattern. If any one branch matches, we carry on as at the end of a normal bracket, leaving the subject pointer. */ case OP_ONCE: { const uschar *prev = ecode; const uschar *saved_eptr = eptr; do { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup)) == MATCH_MATCH) break; if (rrc != MATCH_NOMATCH) return rrc; ecode += GET(ecode,1); } while (*ecode == OP_ALT); /* If hit the end of the group (which could be repeated), fail */ if (*ecode != OP_ONCE && *ecode != OP_ALT) return MATCH_NOMATCH; /* Continue as from after the assertion, updating the offsets high water mark, since extracts may have been taken. */ do ecode += GET(ecode,1); while (*ecode == OP_ALT); offset_top = md->end_offset_top; eptr = md->end_match_ptr; /* For a non-repeating ket, just continue at this level. This also happens for a repeating ket if no characters were matched in the group. This is the forcible breaking of infinite loops as implemented in Perl 5.005. If there is an options reset, it will get obeyed in the normal course of events. */ if (*ecode == OP_KET || eptr == saved_eptr) { ecode += 1+LINK_SIZE; break; } /* The repeating kets try the rest of the pattern or restart from the preceding bracket, in the appropriate order. We need to reset any options that changed within the bracket before re-running it, so check the next opcode. */ if (ecode[1+LINK_SIZE] == OP_OPT) { ims = (ims & ~PCRE_IMS) | ecode[4]; DPRINTF(("ims set to %02lx at group repeat\n", ims)); } if (*ecode == OP_KETRMIN) { if ((rrc = match(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if ((rrc = match(eptr, prev, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; } else /* OP_KETRMAX */ { if ((rrc = match(eptr, prev, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; if ((rrc = match(eptr, ecode + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; } } return MATCH_NOMATCH; /* An alternation is the end of a branch; scan along to find the end of the bracketed group and go to there. */ case OP_ALT: do ecode += GET(ecode,1); while (*ecode == OP_ALT); break; /* BRAZERO and BRAMINZERO occur just before a bracket group, indicating that it may occur zero times. It may repeat infinitely, or not at all - i.e. it could be ()* or ()? in the pattern. Brackets with fixed upper repeat limits are compiled as a number of copies, with the optional ones preceded by BRAZERO or BRAMINZERO. */ case OP_BRAZERO: { const uschar *next = ecode+1; if ((rrc = match(eptr, next, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; do next += GET(next,1); while (*next == OP_ALT); ecode = next + 1+LINK_SIZE; } break; case OP_BRAMINZERO: { const uschar *next = ecode+1; do next += GET(next,1); while (*next == OP_ALT); if ((rrc = match(eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; ecode++; } break; /* End of a group, repeated or non-repeating. If we are at the end of an assertion "group", stop matching and return MATCH_MATCH, but record the current high water mark for use by positive assertions. Do this also for the "once" (not-backup up) groups. */ case OP_KET: case OP_KETRMIN: case OP_KETRMAX: { const uschar *prev = ecode - GET(ecode, 1); const uschar *saved_eptr = eptrb->saved_eptr; eptrb = eptrb->prev; /* Back up the stack of bracket start pointers */ if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT || *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT || *prev == OP_ONCE) { md->end_match_ptr = eptr; /* For ONCE */ md->end_offset_top = offset_top; return MATCH_MATCH; } /* In all other cases except a conditional group we have to check the group number back at the start and if necessary complete handling an extraction by setting the offsets and bumping the high water mark. */ if (*prev != OP_COND) { int offset; int number = *prev - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (number > EXTRACT_BASIC_MAX) number = GET2(prev, 2+LINK_SIZE); offset = number << 1; #ifdef DEBUG printf("end bracket %d", number); printf("\n"); #endif /* Test for a numbered group. This includes groups called as a result of recursion. Note that whole-pattern recursion is coded as a recurse into group 0, so it won't be picked up here. Instead, we catch it when the OP_END is reached. */ if (number > 0) { md->capture_last = number; if (offset >= md->offset_max) md->offset_overflow = TRUE; else { md->offset_vector[offset] = md->offset_vector[md->offset_end - number]; md->offset_vector[offset+1] = eptr - md->start_subject; if (offset_top <= offset) offset_top = offset + 2; } /* Handle a recursively called group. Restore the offsets appropriately and continue from after the call. */ if (md->recursive != NULL && md->recursive->group_num == number) { recursion_info *rec = md->recursive; DPRINTF(("Recursion (%d) succeeded - continuing\n", number)); md->recursive = rec->prev; md->start_match = rec->save_start; memcpy(md->offset_vector, rec->offset_save, rec->saved_max * sizeof(int)); ecode = rec->after_call; ims = original_ims; break; } } } /* Reset the value of the ims flags, in case they got changed during the group. */ ims = original_ims; DPRINTF(("ims reset to %02lx\n", ims)); /* For a non-repeating ket, just continue at this level. This also happens for a repeating ket if no characters were matched in the group. This is the forcible breaking of infinite loops as implemented in Perl 5.005. If there is an options reset, it will get obeyed in the normal course of events. */ if (*ecode == OP_KET || eptr == saved_eptr) { ecode += 1 + LINK_SIZE; break; } /* The repeating kets try the rest of the pattern or restart from the preceding bracket, in the appropriate order. */ if (*ecode == OP_KETRMIN) { if ((rrc = match(eptr, ecode + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if ((rrc = match(eptr, prev, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; } else /* OP_KETRMAX */ { if ((rrc = match(eptr, prev, offset_top, md, ims, eptrb, match_isgroup)) != MATCH_NOMATCH) return rrc; if ((rrc = match(eptr, ecode + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; } } return MATCH_NOMATCH; /* Start of subject unless notbol, or after internal newline if multiline */ case OP_CIRC: if (md->notbol && eptr == md->start_subject) return MATCH_NOMATCH; if ((ims & PCRE_MULTILINE) != 0) { if (eptr != md->start_subject && eptr[-1] != NEWLINE) return MATCH_NOMATCH; ecode++; break; } /* ... else fall through */ /* Start of subject assertion */ case OP_SOD: if (eptr != md->start_subject) return MATCH_NOMATCH; ecode++; break; /* Start of match assertion */ case OP_SOM: if (eptr != md->start_subject + md->start_offset) return MATCH_NOMATCH; ecode++; break; /* Assert before internal newline if multiline, or before a terminating newline unless endonly is set, else end of subject unless noteol is set. */ case OP_DOLL: if ((ims & PCRE_MULTILINE) != 0) { if (eptr < md->end_subject) { if (*eptr != NEWLINE) return MATCH_NOMATCH; } else { if (md->noteol) return MATCH_NOMATCH; } ecode++; break; } else { if (md->noteol) return MATCH_NOMATCH; if (!md->endonly) { if (eptr < md->end_subject - 1 || (eptr == md->end_subject - 1 && *eptr != NEWLINE)) return MATCH_NOMATCH; ecode++; break; } } /* ... else fall through */ /* End of subject assertion (\z) */ case OP_EOD: if (eptr < md->end_subject) return MATCH_NOMATCH; ecode++; break; /* End of subject or ending \n assertion (\Z) */ case OP_EODN: if (eptr < md->end_subject - 1 || (eptr == md->end_subject - 1 && *eptr != NEWLINE)) return MATCH_NOMATCH; ecode++; break; /* Word boundary assertions */ case OP_NOT_WORD_BOUNDARY: case OP_WORD_BOUNDARY: { BOOL prev_is_word, cur_is_word; /* Find out if the previous and current characters are "word" characters. It takes a bit more work in UTF-8 mode. Characters > 255 are assumed to be "non-word" characters. */ #ifdef SUPPORT_UTF8 if (md->utf8) { if (eptr == md->start_subject) prev_is_word = FALSE; else { const uschar *lastptr = eptr - 1; while ((*lastptr & 0xc0) == 0x80) lastptr--; GETCHAR(c, lastptr); prev_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0; } if (eptr >= md->end_subject) cur_is_word = FALSE; else { GETCHAR(c, eptr); cur_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0; } } else #endif /* More streamlined when not in UTF-8 mode */ { prev_is_word = (eptr != md->start_subject) && ((md->ctypes[eptr[-1]] & ctype_word) != 0); cur_is_word = (eptr < md->end_subject) && ((md->ctypes[*eptr] & ctype_word) != 0); } /* Now see if the situation is what we want */ if ((*ecode++ == OP_WORD_BOUNDARY)? cur_is_word == prev_is_word : cur_is_word != prev_is_word) return MATCH_NOMATCH; } break; /* Match a single character type; inline for speed */ case OP_ANY: if ((ims & PCRE_DOTALL) == 0 && eptr < md->end_subject && *eptr == NEWLINE) return MATCH_NOMATCH; if (eptr++ >= md->end_subject) return MATCH_NOMATCH; #ifdef SUPPORT_UTF8 if (md->utf8) while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; #endif ecode++; break; /* Match a single byte, even in UTF-8 mode. This opcode really does match any byte, even newline, independent of the setting of PCRE_DOTALL. */ case OP_ANYBYTE: if (eptr++ >= md->end_subject) return MATCH_NOMATCH; ecode++; break; case OP_NOT_DIGIT: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_digit) != 0 ) return MATCH_NOMATCH; ecode++; break; case OP_DIGIT: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_digit) == 0 ) return MATCH_NOMATCH; ecode++; break; case OP_NOT_WHITESPACE: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_space) != 0 ) return MATCH_NOMATCH; ecode++; break; case OP_WHITESPACE: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_space) == 0 ) return MATCH_NOMATCH; ecode++; break; case OP_NOT_WORDCHAR: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_word) != 0 ) return MATCH_NOMATCH; ecode++; break; case OP_WORDCHAR: if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_word) == 0 ) return MATCH_NOMATCH; ecode++; break; /* Match a back reference, possibly repeatedly. Look past the end of the item to see if there is repeat information following. The code is similar to that for character classes, but repeated for efficiency. Then obey similar code to character type repeats - written out again for speed. However, if the referenced string is the empty string, always treat it as matched, any number of times (otherwise there could be infinite loops). */ case OP_REF: { int length; int offset = GET2(ecode, 1) << 1; /* Doubled ref number */ ecode += 3; /* Advance past item */ /* If the reference is unset, set the length to be longer than the amount of subject left; this ensures that every attempt at a match fails. We can't just fail here, because of the possibility of quantifiers with zero minima. */ length = (offset >= offset_top || md->offset_vector[offset] < 0)? md->end_subject - eptr + 1 : md->offset_vector[offset+1] - md->offset_vector[offset]; /* Set up for repetition, or handle the non-repeated case */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ if (!match_ref(offset, eptr, length, md, ims)) return MATCH_NOMATCH; eptr += length; continue; /* With the main loop */ } /* If the length of the reference is zero, just continue with the main loop. */ if (length == 0) continue; /* First, ensure the minimum number of matches are present. We get back the length of the reference string explicitly rather than passing the address of eptr, so that eptr can be a register variable. */ for (i = 1; i <= min; i++) { if (!match_ref(offset, eptr, length, md, ims)) return MATCH_NOMATCH; eptr += length; } /* If min = max, continue at the same level without recursion. They are not both allowed to be zero. */ if (min == max) continue; /* If minimizing, keep trying and advancing the pointer */ if (minimize) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || !match_ref(offset, eptr, length, md, ims)) return MATCH_NOMATCH; eptr += length; } /* Control never gets here */ } /* If maximizing, find the longest string and work backwards */ else { const uschar *pp = eptr; for (i = min; i < max; i++) { if (!match_ref(offset, eptr, length, md, ims)) break; eptr += length; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr -= length; } return MATCH_NOMATCH; } } /* Control never gets here */ /* Match a bit-mapped character class, possibly repeatedly. This op code is used when all the characters in the class have values in the range 0-255. The only difference between OP_CLASS and OP_NCLASS occurs when a data character outside the range is encountered. First, look past the end of the item to see if there is repeat information following. Then obey similar code to character type repeats - written out again for speed. */ case OP_NCLASS: case OP_CLASS: { const uschar *data = ecode + 1; /* Save for matching */ ecode += 33; /* Advance past the item */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ min = max = 1; break; } /* First, ensure the minimum number of matches are present. */ #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); if (c > 255) { if (op == OP_CLASS) return MATCH_NOMATCH; } else { if ((data[c/8] & (1 << (c&7))) == 0) return MATCH_NOMATCH; } } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) return MATCH_NOMATCH; c = *eptr++; if ((data[c/8] & (1 << (c&7))) == 0) return MATCH_NOMATCH; } } /* If max == min we can continue with the main loop without the need to recurse. */ if (min == max) continue; /* If minimizing, keep testing the rest of the expression and advancing the pointer while it matches the class. */ if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); if (c > 255) { if (op == OP_CLASS) return MATCH_NOMATCH; } else { if ((data[c/8] & (1 << (c&7))) == 0) return MATCH_NOMATCH; } } } else #endif /* Not UTF-8 mode */ { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject) return MATCH_NOMATCH; c = *eptr++; if ((data[c/8] & (1 << (c&7))) == 0) return MATCH_NOMATCH; } } /* Control never gets here */ } /* If maximizing, find the longest possible run, then work backwards. */ else { const uschar *pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c > 255) { if (op == OP_CLASS) break; } else { if ((data[c/8] & (1 << (c&7))) == 0) break; } eptr += len; } while (eptr >= pp) { if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; BACKCHAR(eptr) } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject) break; c = *eptr; if ((data[c/8] & (1 << (c&7))) == 0) break; eptr++; } while (eptr >= pp) { if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; } } return MATCH_NOMATCH; } } /* Control never gets here */ /* Match an extended character class. This opcode is encountered only in UTF-8 mode, because that's the only time it is compiled. */ #ifdef SUPPORT_UTF8 case OP_XCLASS: { const uschar *data = ecode + 1 + LINK_SIZE; /* Save for matching */ ecode += GET(ecode, 1); /* Advance past the item */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ min = max = 1; break; } /* First, ensure the minimum number of matches are present. */ for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); if (!match_xclass(c, data)) return MATCH_NOMATCH; } /* If max == min we can continue with the main loop without the need to recurse. */ if (min == max) continue; /* If minimizing, keep testing the rest of the expression and advancing the pointer while it matches the class. */ if (minimize) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); if (!match_xclass(c, data)) return MATCH_NOMATCH; } /* Control never gets here */ } /* If maximizing, find the longest possible run, then work backwards. */ else { const uschar *pp = eptr; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (!match_xclass(c, data)) break; eptr += len; } while (eptr >= pp) { if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; BACKCHAR(eptr) } return MATCH_NOMATCH; } /* Control never gets here */ } #endif /* End of XCLASS */ /* Match a run of characters */ case OP_CHARS: { register int length = ecode[1]; ecode += 2; #ifdef DEBUG /* Sigh. Some compilers never learn. */ if (eptr >= md->end_subject) printf("matching subject against pattern "); else { printf("matching subject "); pchars(eptr, length, TRUE, md); printf(" against pattern "); } pchars(ecode, length, FALSE, md); printf("\n"); #endif if (length > md->end_subject - eptr) return MATCH_NOMATCH; if ((ims & PCRE_CASELESS) != 0) { while (length-- > 0) if (md->lcc[*ecode++] != md->lcc[*eptr++]) return MATCH_NOMATCH; } else { while (length-- > 0) if (*ecode++ != *eptr++) return MATCH_NOMATCH; } } break; /* Match a single character repeatedly; different opcodes share code. */ case OP_EXACT: min = max = GET2(ecode, 1); ecode += 3; goto REPEATCHAR; case OP_UPTO: case OP_MINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_MINUPTO; ecode += 3; goto REPEATCHAR; case OP_STAR: case OP_MINSTAR: case OP_PLUS: case OP_MINPLUS: case OP_QUERY: case OP_MINQUERY: c = *ecode++ - OP_STAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single-character matches. We can give up quickly if there are fewer than the minimum number of characters left in the subject. */ REPEATCHAR: #ifdef SUPPORT_UTF8 if (md->utf8) { int len = 1; const uschar *charptr = ecode; GETCHARLEN(c, ecode, len); if (min * len > md->end_subject - eptr) return MATCH_NOMATCH; ecode += len; /* Handle multibyte character matching specially here. There is no support for any kind of casing for multibyte characters. */ if (len > 1) { for (i = 1; i <= min; i++) { if (memcmp(eptr, charptr, len) != 0) return MATCH_NOMATCH; eptr += len; } if (min == max) continue; if (minimize) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject || memcmp(eptr, charptr, len) != 0) return MATCH_NOMATCH; eptr += len; } /* Control never gets here */ } else { const uschar *pp = eptr; for (i = min; i < max; i++) { if (eptr > md->end_subject - len || memcmp(eptr, charptr, len) != 0) break; eptr += len; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr -= len; } return MATCH_NOMATCH; } /* Control never gets here */ } /* If the length of a UTF-8 character is 1, we fall through here, and obey the code as for non-UTF-8 characters below, though in this case the value of c will always be < 128. */ } else #endif /* When not in UTF-8 mode, load a single-byte character. */ { if (min > md->end_subject - eptr) return MATCH_NOMATCH; c = *ecode++; } /* The value of c at this point is always less than 256, though we may or may not be in UTF-8 mode. The code is duplicated for the caseless and caseful cases, for speed, since matching characters is likely to be quite common. First, ensure the minimum number of matches are present. If min = max, continue at the same level without recursing. Otherwise, if minimizing, keep trying the rest of the expression and advancing one matching character if failing, up to the maximum. Alternatively, if maximizing, find the maximum number of characters and work backwards. */ DPRINTF(("matching %c{%d,%d} against subject %.*s\n", c, min, max, max, eptr)); if ((ims & PCRE_CASELESS) != 0) { c = md->lcc[c]; for (i = 1; i <= min; i++) if (c != md->lcc[*eptr++]) return MATCH_NOMATCH; if (min == max) continue; if (minimize) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject || c != md->lcc[*eptr++]) return MATCH_NOMATCH; } /* Control never gets here */ } else { const uschar *pp = eptr; for (i = min; i < max; i++) { if (eptr >= md->end_subject || c != md->lcc[*eptr]) break; eptr++; } while (eptr >= pp) if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; return MATCH_NOMATCH; } /* Control never gets here */ } /* Caseful comparisons (includes all multi-byte characters) */ else { for (i = 1; i <= min; i++) if (c != *eptr++) return MATCH_NOMATCH; if (min == max) continue; if (minimize) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject || c != *eptr++) return MATCH_NOMATCH; } /* Control never gets here */ } else { const uschar *pp = eptr; for (i = min; i < max; i++) { if (eptr >= md->end_subject || c != *eptr) break; eptr++; } while (eptr >= pp) if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; return MATCH_NOMATCH; } } /* Control never gets here */ /* Match a negated single one-byte character. The character we are checking can be multibyte. */ case OP_NOT: if (eptr >= md->end_subject) return MATCH_NOMATCH; ecode++; GETCHARINCTEST(c, eptr); if ((ims & PCRE_CASELESS) != 0) { #ifdef SUPPORT_UTF8 if (c < 256) #endif c = md->lcc[c]; if (md->lcc[*ecode++] == c) return MATCH_NOMATCH; } else { if (*ecode++ == c) return MATCH_NOMATCH; } break; /* Match a negated single one-byte character repeatedly. This is almost a repeat of the code for a repeated single character, but I haven't found a nice way of commoning these up that doesn't require a test of the positive/negative option for each character match. Maybe that wouldn't add very much to the time taken, but character matching *is* what this is all about... */ case OP_NOTEXACT: min = max = GET2(ecode, 1); ecode += 3; goto REPEATNOTCHAR; case OP_NOTUPTO: case OP_NOTMINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_NOTMINUPTO; ecode += 3; goto REPEATNOTCHAR; case OP_NOTSTAR: case OP_NOTMINSTAR: case OP_NOTPLUS: case OP_NOTMINPLUS: case OP_NOTQUERY: case OP_NOTMINQUERY: c = *ecode++ - OP_NOTSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single-character (less than 255) matches. We can give up quickly if there are fewer than the minimum number of characters left in the subject. */ REPEATNOTCHAR: if (min > md->end_subject - eptr) return MATCH_NOMATCH; c = *ecode++; /* The code is duplicated for the caseless and caseful cases, for speed, since matching characters is likely to be quite common. First, ensure the minimum number of matches are present. If min = max, continue at the same level without recursing. Otherwise, if minimizing, keep trying the rest of the expression and advancing one matching character if failing, up to the maximum. Alternatively, if maximizing, find the maximum number of characters and work backwards. */ DPRINTF(("negative matching %c{%d,%d} against subject %.*s\n", c, min, max, max, eptr)); if ((ims & PCRE_CASELESS) != 0) { c = md->lcc[c]; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = 1; i <= min; i++) { GETCHARINC(d, eptr); if (d < 256) d = md->lcc[d]; if (c == d) return MATCH_NOMATCH; } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) if (c == md->lcc[*eptr++]) return MATCH_NOMATCH; } if (min == max) continue; if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; GETCHARINC(d, eptr); if (d < 256) d = md->lcc[d]; if (i >= max || eptr >= md->end_subject || c == d) return MATCH_NOMATCH; } } else #endif /* Not UTF-8 mode */ { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject || c == md->lcc[*eptr++]) return MATCH_NOMATCH; } } /* Control never gets here */ } /* Maximize case */ else { const uschar *pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(d, eptr, len); if (d < 256) d = md->lcc[d]; if (c == d) break; eptr += len; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr--; BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject || c == md->lcc[*eptr]) break; eptr++; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr--; } } return MATCH_NOMATCH; } /* Control never gets here */ } /* Caseful comparisons */ else { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = 1; i <= min; i++) { GETCHARINC(d, eptr); if (c == d) return MATCH_NOMATCH; } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) if (c == *eptr++) return MATCH_NOMATCH; } if (min == max) continue; if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; GETCHARINC(d, eptr); if (i >= max || eptr >= md->end_subject || c == d) return MATCH_NOMATCH; } } else #endif /* Not UTF-8 mode */ { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject || c == *eptr++) return MATCH_NOMATCH; } } /* Control never gets here */ } /* Maximize case */ else { const uschar *pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { register int d; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(d, eptr, len); if (c == d) break; eptr += len; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr--; BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject || c == *eptr) break; eptr++; } while (eptr >= pp) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; eptr--; } } return MATCH_NOMATCH; } } /* Control never gets here */ /* Match a single character type repeatedly; several different opcodes share code. This is very similar to the code for single characters, but we repeat it in the interests of efficiency. */ case OP_TYPEEXACT: min = max = GET2(ecode, 1); minimize = TRUE; ecode += 3; goto REPEATTYPE; case OP_TYPEUPTO: case OP_TYPEMINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_TYPEMINUPTO; ecode += 3; goto REPEATTYPE; case OP_TYPESTAR: case OP_TYPEMINSTAR: case OP_TYPEPLUS: case OP_TYPEMINPLUS: case OP_TYPEQUERY: case OP_TYPEMINQUERY: c = *ecode++ - OP_TYPESTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single character type matches. Note that in UTF-8 mode, '.' matches a character of any length, but for the other character types, the valid characters are all one-byte long. */ REPEATTYPE: ctype = *ecode++; /* Code for the character type */ /* First, ensure the minimum number of matches are present. Use inline code for maximizing the speed, and do the type test once at the start (i.e. keep it out of the loop). Also we can test that there are at least the minimum number of bytes before we start. This isn't as effective in UTF-8 mode, but it does no harm. Separate the UTF-8 code completely as that is tidier. */ if (min > md->end_subject - eptr) return MATCH_NOMATCH; if (min > 0) { #ifdef SUPPORT_UTF8 if (md->utf8) switch(ctype) { case OP_ANY: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || (*eptr++ == NEWLINE && (ims & PCRE_DOTALL) == 0)) return MATCH_NOMATCH; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_ANYBYTE: eptr += min; break; case OP_NOT_DIGIT: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) return MATCH_NOMATCH; } break; case OP_DIGIT: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_digit) == 0) return MATCH_NOMATCH; /* No need to skip more bytes - we know it's a 1-byte character */ } break; case OP_NOT_WHITESPACE: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || (*eptr < 128 && (md->ctypes[*eptr++] & ctype_space) != 0)) return MATCH_NOMATCH; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_WHITESPACE: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_space) == 0) return MATCH_NOMATCH; /* No need to skip more bytes - we know it's a 1-byte character */ } break; case OP_NOT_WORDCHAR: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || (*eptr < 128 && (md->ctypes[*eptr++] & ctype_word) != 0)) return MATCH_NOMATCH; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_WORDCHAR: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_word) == 0) return MATCH_NOMATCH; /* No need to skip more bytes - we know it's a 1-byte character */ } break; } else #endif /* Code for the non-UTF-8 case for minimum matching */ switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0) { for (i = 1; i <= min; i++) if (*eptr++ == NEWLINE) return MATCH_NOMATCH; } else eptr += min; break; case OP_ANYBYTE: eptr += min; break; case OP_NOT_DIGIT: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_digit) != 0) return MATCH_NOMATCH; break; case OP_DIGIT: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_digit) == 0) return MATCH_NOMATCH; break; case OP_NOT_WHITESPACE: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_space) != 0) return MATCH_NOMATCH; break; case OP_WHITESPACE: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_space) == 0) return MATCH_NOMATCH; break; case OP_NOT_WORDCHAR: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_word) != 0) return MATCH_NOMATCH; break; case OP_WORDCHAR: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_word) == 0) return MATCH_NOMATCH; break; } } /* If min = max, continue at the same level without recursing */ if (min == max) continue; /* If minimizing, we have to test the rest of the pattern before each subsequent match. Again, separate the UTF-8 case for speed. */ if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject) return MATCH_NOMATCH; GETCHARINC(c, eptr); switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0 && c == NEWLINE) return MATCH_NOMATCH; break; case OP_ANYBYTE: break; case OP_NOT_DIGIT: if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) return MATCH_NOMATCH; break; case OP_DIGIT: if (c >= 256 || (md->ctypes[c] & ctype_digit) == 0) return MATCH_NOMATCH; break; case OP_NOT_WHITESPACE: if (c < 256 && (md->ctypes[c] & ctype_space) != 0) return MATCH_NOMATCH; break; case OP_WHITESPACE: if (c >= 256 || (md->ctypes[c] & ctype_space) == 0) return MATCH_NOMATCH; break; case OP_NOT_WORDCHAR: if (c < 256 && (md->ctypes[c] & ctype_word) != 0) return MATCH_NOMATCH; break; case OP_WORDCHAR: if (c >= 256 && (md->ctypes[c] & ctype_word) == 0) return MATCH_NOMATCH; break; } } } else #endif /* Not UTF-8 mode */ { for (i = min;; i++) { if ((rrc = match(eptr, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; if (i >= max || eptr >= md->end_subject) return MATCH_NOMATCH; c = *eptr++; switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0 && c == NEWLINE) return MATCH_NOMATCH; break; case OP_ANYBYTE: break; case OP_NOT_DIGIT: if ((md->ctypes[c] & ctype_digit) != 0) return MATCH_NOMATCH; break; case OP_DIGIT: if ((md->ctypes[c] & ctype_digit) == 0) return MATCH_NOMATCH; break; case OP_NOT_WHITESPACE: if ((md->ctypes[c] & ctype_space) != 0) return MATCH_NOMATCH; break; case OP_WHITESPACE: if ((md->ctypes[c] & ctype_space) == 0) return MATCH_NOMATCH; break; case OP_NOT_WORDCHAR: if ((md->ctypes[c] & ctype_word) != 0) return MATCH_NOMATCH; break; case OP_WORDCHAR: if ((md->ctypes[c] & ctype_word) == 0) return MATCH_NOMATCH; break; } } } /* Control never gets here */ } /* If maximizing it is worth using inline code for speed, doing the type test once at the start (i.e. keep it out of the loop). Again, keep the UTF-8 stuff separate. */ else { const uschar *pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (md->utf8) { switch(ctype) { case OP_ANY: /* Special code is required for UTF8, but when the maximum is unlimited we don't need it, so we repeat the non-UTF8 code. This is probably worth it, because .* is quite a common idiom. */ if (max < INT_MAX) { if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || *eptr == NEWLINE) break; eptr++; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } } else { for (i = min; i < max; i++) { eptr++; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } } } /* Handle unlimited UTF-8 repeat */ else { if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || *eptr == NEWLINE) break; eptr++; } break; } else { c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; } } break; /* The byte case is the same as non-UTF8 */ case OP_ANYBYTE: c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; break; case OP_NOT_DIGIT: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) break; eptr+= len; } break; case OP_DIGIT: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 ||(md->ctypes[c] & ctype_digit) == 0) break; eptr+= len; } break; case OP_NOT_WHITESPACE: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_space) != 0) break; eptr+= len; } break; case OP_WHITESPACE: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 ||(md->ctypes[c] & ctype_space) == 0) break; eptr+= len; } break; case OP_NOT_WORDCHAR: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_word) != 0) break; eptr+= len; } break; case OP_WORDCHAR: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 || (md->ctypes[c] & ctype_word) == 0) break; eptr+= len; } break; } /* eptr is now past the end of the maximum run */ while (eptr >= pp) { if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || *eptr == NEWLINE) break; eptr++; } break; } /* For DOTALL case, fall through and treat as \C */ case OP_ANYBYTE: c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; break; case OP_NOT_DIGIT: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) != 0) break; eptr++; } break; case OP_DIGIT: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) == 0) break; eptr++; } break; case OP_NOT_WHITESPACE: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) != 0) break; eptr++; } break; case OP_WHITESPACE: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) == 0) break; eptr++; } break; case OP_NOT_WORDCHAR: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) != 0) break; eptr++; } break; case OP_WORDCHAR: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) == 0) break; eptr++; } break; } /* eptr is now past the end of the maximum run */ while (eptr >= pp) { if ((rrc = match(eptr--, ecode, offset_top, md, ims, eptrb, 0)) != MATCH_NOMATCH) return rrc; } } /* Get here if we can't make it match with any permitted repetitions */ return MATCH_NOMATCH; } /* Control never gets here */ /* There's been some horrible disaster. Since all codes > OP_BRA are for capturing brackets, and there shouldn't be any gaps between 0 and OP_BRA, arrival here can only mean there is something seriously wrong in the code above or the OP_xxx definitions. */ default: DPRINTF(("Unknown opcode %d\n", *ecode)); return PCRE_ERROR_UNKNOWN_NODE; } /* Do not stick any code in here without much thought; it is assumed that "continue" in the code above comes out to here to repeat the main loop. */ } /* End of main loop */ /* Control never reaches here */ } /************************************************* * Execute a Regular Expression * *************************************************/ /* This function applies a compiled re to a subject string and picks out portions of the string if it matches. Two elements in the vector are set for each substring: the offsets to the start and end of the substring. Arguments: external_re points to the compiled expression extra_data points to extra data or is NULL subject points to the subject string length length of subject string (may contain binary zeros) start_offset where to start in the subject string options option bits offsets points to a vector of ints to be filled in with offsets offsetcount the number of elements in the vector Returns: > 0 => success; value is the number of elements filled in = 0 => success, but offsets is not big enough -1 => failed to match < -1 => some kind of unexpected problem */ int pcre_exec(const pcre *external_re, const pcre_extra *extra_data, const char *subject, int length, int start_offset, int options, int *offsets, int offsetcount) { int rc, resetcount, ocount; int first_byte = -1; int req_byte = -1; int req_byte2 = -1; unsigned long int ims = 0; BOOL using_temporary_offsets = FALSE; BOOL anchored; BOOL startline; BOOL first_byte_caseless = FALSE; BOOL req_byte_caseless = FALSE; match_data match_block; const uschar *start_bits = NULL; const uschar *start_match = (const uschar *)subject + start_offset; const uschar *end_subject; const uschar *req_byte_ptr = start_match - 1; const pcre_study_data *study; const real_pcre *re = (const real_pcre *)external_re; /* Plausibility checks */ if ((options & ~PUBLIC_EXEC_OPTIONS) != 0) return PCRE_ERROR_BADOPTION; if (re == NULL || subject == NULL || (offsets == NULL && offsetcount > 0)) return PCRE_ERROR_NULL; /* Fish out the optional data from the extra_data structure, first setting the default values. */ study = NULL; match_block.match_limit = MATCH_LIMIT; match_block.callout_data = NULL; if (extra_data != NULL) { register unsigned int flags = extra_data->flags; if ((flags & PCRE_EXTRA_STUDY_DATA) != 0) study = (pcre_study_data*)extra_data->study_data; if ((flags & PCRE_EXTRA_MATCH_LIMIT) != 0) match_block.match_limit = extra_data->match_limit; if ((flags & PCRE_EXTRA_CALLOUT_DATA) != 0) match_block.callout_data = extra_data->callout_data; } /* Now we have re supposedly pointing to the regex */ if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC; anchored = ((re->options | options) & PCRE_ANCHORED) != 0; startline = (re->options & PCRE_STARTLINE) != 0; match_block.start_code = (const uschar *)re + sizeof(real_pcre) + re->name_count * re->name_entry_size; match_block.start_subject = (const uschar *)subject; match_block.start_offset = start_offset; match_block.end_subject = match_block.start_subject + length; end_subject = match_block.end_subject; match_block.endonly = (re->options & PCRE_DOLLAR_ENDONLY) != 0; match_block.utf8 = (re->options & PCRE_UTF8) != 0; match_block.notbol = (options & PCRE_NOTBOL) != 0; match_block.noteol = (options & PCRE_NOTEOL) != 0; match_block.notempty = (options & PCRE_NOTEMPTY) != 0; match_block.recursive = NULL; /* No recursion at top level */ match_block.lcc = re->tables + lcc_offset; match_block.ctypes = re->tables + ctypes_offset; /* The ims options can vary during the matching as a result of the presence of (?ims) items in the pattern. They are kept in a local variable so that restoring at the exit of a group is easy. */ ims = re->options & (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL); /* If the expression has got more back references than the offsets supplied can hold, we get a temporary bit of working store to use during the matching. Otherwise, we can use the vector supplied, rounding down its size to a multiple of 3. */ ocount = offsetcount - (offsetcount % 3); if (re->top_backref > 0 && re->top_backref >= ocount/3) { ocount = re->top_backref * 3 + 3; match_block.offset_vector = (int *)(pcre_malloc)(ocount * sizeof(int)); if (match_block.offset_vector == NULL) return PCRE_ERROR_NOMEMORY; using_temporary_offsets = TRUE; DPRINTF(("Got memory to hold back references\n")); } else match_block.offset_vector = offsets; match_block.offset_end = ocount; match_block.offset_max = (2*ocount)/3; match_block.offset_overflow = FALSE; match_block.capture_last = -1; /* Compute the minimum number of offsets that we need to reset each time. Doing this makes a huge difference to execution time when there aren't many brackets in the pattern. */ resetcount = 2 + re->top_bracket * 2; if (resetcount > offsetcount) resetcount = ocount; /* Reset the working variable associated with each extraction. These should never be used unless previously set, but they get saved and restored, and so we initialize them to avoid reading uninitialized locations. */ if (match_block.offset_vector != NULL) { register int *iptr = match_block.offset_vector + ocount; register int *iend = iptr - resetcount/2 + 1; while (--iptr >= iend) *iptr = -1; } /* Set up the first character to match, if available. The first_byte value is never set for an anchored regular expression, but the anchoring may be forced at run time, so we have to test for anchoring. The first char may be unset for an unanchored pattern, of course. If there's no first char and the pattern was studied, there may be a bitmap of possible first characters. */ if (!anchored) { if ((re->options & PCRE_FIRSTSET) != 0) { first_byte = re->first_byte & 255; if ((first_byte_caseless = ((re->first_byte & REQ_CASELESS) != 0)) == TRUE) first_byte = match_block.lcc[first_byte]; } else if (!startline && study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0) start_bits = study->start_bits; } /* For anchored or unanchored matches, there may be a "last known required character" set. */ if ((re->options & PCRE_REQCHSET) != 0) { req_byte = re->req_byte & 255; req_byte_caseless = (re->req_byte & REQ_CASELESS) != 0; req_byte2 = (re->tables + fcc_offset)[req_byte]; /* case flipped */ } /* Loop for handling unanchored repeated matching attempts; for anchored regexs the loop runs just once. */ do { register int *iptr = match_block.offset_vector; register int *iend = iptr + resetcount; /* Reset the maximum number of extractions we might see. */ while (iptr < iend) *iptr++ = -1; /* Advance to a unique first char if possible */ if (first_byte >= 0) { if (first_byte_caseless) while (start_match < end_subject && match_block.lcc[*start_match] != first_byte) start_match++; else while (start_match < end_subject && *start_match != first_byte) start_match++; } /* Or to just after \n for a multiline match if possible */ else if (startline) { if (start_match > match_block.start_subject + start_offset) { while (start_match < end_subject && start_match[-1] != NEWLINE) start_match++; } } /* Or to a non-unique first char after study */ else if (start_bits != NULL) { while (start_match < end_subject) { register int c = *start_match; if ((start_bits[c/8] & (1 << (c&7))) == 0) start_match++; else break; } } #ifdef DEBUG /* Sigh. Some compilers never learn. */ printf(">>>> Match against: "); pchars(start_match, end_subject - start_match, TRUE, &match_block); printf("\n"); #endif /* If req_byte is set, we know that that character must appear in the subject for the match to succeed. If the first character is set, req_byte must be later in the subject; otherwise the test starts at the match point. This optimization can save a huge amount of backtracking in patterns with nested unlimited repeats that aren't going to match. Writing separate code for cased/caseless versions makes it go faster, as does using an autoincrement and backing off on a match. HOWEVER: when the subject string is very, very long, searching to its end can take a long time, and give bad performance on quite ordinary patterns. This showed up when somebody was matching /^C/ on a 32-megabyte string... so we don't do this when the string is sufficiently long. */ if (req_byte >= 0 && end_subject - start_match < REQ_BYTE_MAX) { register const uschar *p = start_match + ((first_byte >= 0)? 1 : 0); /* We don't need to repeat the search if we haven't yet reached the place we found it at last time. */ if (p > req_byte_ptr) { if (req_byte_caseless) { while (p < end_subject) { register int pp = *p++; if (pp == req_byte || pp == req_byte2) { p--; break; } } } else { while (p < end_subject) { if (*p++ == req_byte) { p--; break; } } } /* If we can't find the required character, break the matching loop */ if (p >= end_subject) break; /* If we have found the required character, save the point where we found it, so that we don't search again next time round the loop if the start hasn't passed this character yet. */ req_byte_ptr = p; } } /* When a match occurs, substrings will be set for all internal extractions; we just need to set up the whole thing as substring 0 before returning. If there were too many extractions, set the return code to zero. In the case where we had to get some local store to hold offsets for backreferences, copy those back references that we can. In this case there need not be overflow if certain parts of the pattern were not used. */ match_block.start_match = start_match; match_block.match_call_count = 0; rc = match(start_match, match_block.start_code, 2, &match_block, ims, NULL, match_isgroup); if (rc == MATCH_NOMATCH) { start_match++; #ifdef SUPPORT_UTF8 if (match_block.utf8) while ((*start_match & 0xc0) == 0x80) start_match++; #endif continue; } if (rc != MATCH_MATCH) { DPRINTF((">>>> error: returning %d\n", rc)); return rc; } /* We have a match! Copy the offset information from temporary store if necessary */ if (using_temporary_offsets) { if (offsetcount >= 4) { memcpy(offsets + 2, match_block.offset_vector + 2, (offsetcount - 2) * sizeof(int)); DPRINTF(("Copied offsets from temporary memory\n")); } if (match_block.end_offset_top > offsetcount) match_block.offset_overflow = TRUE; DPRINTF(("Freeing temporary memory\n")); (pcre_free)(match_block.offset_vector); } rc = match_block.offset_overflow? 0 : match_block.end_offset_top/2; if (offsetcount < 2) rc = 0; else { offsets[0] = start_match - match_block.start_subject; offsets[1] = match_block.end_match_ptr - match_block.start_subject; } DPRINTF((">>>> returning %d\n", rc)); return rc; } /* This "while" is the end of the "do" above */ while (!anchored && start_match <= end_subject); if (using_temporary_offsets) { DPRINTF(("Freeing temporary memory\n")); (pcre_free)(match_block.offset_vector); } DPRINTF((">>>> returning PCRE_ERROR_NOMATCH\n")); return PCRE_ERROR_NOMATCH; } /* End of pcre.c */