141 lines
2.3 KiB
C++
141 lines
2.3 KiB
C++
// 21 may 2018
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#ifdef _WIN32
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#define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES 1
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#define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT 1
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#include <io.h>
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#include <sys/stat.h>
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#define openfunc _open
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#define openflags (_O_RDONLY | _O_BINARY)
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#define openmode (_S_IREAD)
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#define readfunc _read
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#define readtype int
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#define closefunc _close
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#else
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#endif
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#include <typeinfo>
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#include "lib.hpp"
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class eofError : public Error {
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public:
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virtual ~eofError(void);
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virtual const char *String(void) const;
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};
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virtual ~eofError::eofError(void)
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{
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// do nothing
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}
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virtual const char *eofError::String(void) const
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{
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return "EOF";
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}
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class shortWriteError : public Error {
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public:
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virtual ~shortWriteError(void);
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virtual const char *String(void) const;
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};
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virtual ~shortWriteError::shortWriteError(void)
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{
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// do nothing
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}
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virtual const char *shortWriteError::String(void) const
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{
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return "short write";
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}
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Error *NewEOF(void)
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{
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return new eofError;
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}
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Error *NewErrShortWrite(void)
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{
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return new shortWriteError;
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}
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bool IsEOF(Error *e)
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{
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return typeid (e) == typeid (eofError *);
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}
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#define nbuf 1024
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Scanner::Scanner(ReadCloser *r)
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{
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this->r = r;
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this->buf = new char[nbuf];
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this->p = this->buf;
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this->n = 0;
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this->line = new std::vector<char>;
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this->error = NULL;
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}
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Scanner::~Scanner(void)
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{
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if (this->err != NULL)
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delete this->err;
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delete this->line;
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delete[] this->buf;
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}
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bool Scanner::Scan(void)
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{
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readtype n;
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if (this->err != NULL)
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return false;
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this->line->clear();
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for (;;) {
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if (this->n > 0) {
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size_t j;
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bool haveline;
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haveline = false;
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for (j = 0; j < this->n; j++)
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if (this->p[j] == '\n') {
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haveline = true;
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break;
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}
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this->line->insert(this->line->end(), this->p, this->p + j);
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this->p += j;
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this->n -= j;
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if (haveline) {
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// swallow the \n for the next time through
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this->p++;
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this->n--;
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return true;
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}
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// otherwise, the buffer was exhausted in the middle of a line, so fall through
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}
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// need to refill the buffer
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this->err = this->r->Read(this->buf, nbuf * sizeof (char), &n);
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if (this->err != NULL)
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return false;
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this->p = this->buf;
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this->n = n;
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}
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}
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const char *Scanner::Bytes(void) const
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{
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return this->line->data();
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}
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size_t Scanner::Len(void) const
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{
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return this->line->size();
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}
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int Scanner::Err(void) const
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{
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if (!IsEOF(this->err))
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return this->err;
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return NULL;
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}
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