86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/* Copyright (c) 2004-2012 Sergey Lyubka <valenok@gmail.com>
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All rights reserved
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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This is a regular expression library that implements a subset of Perl RE.
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Please refer to http://slre.googlecode.com for detailed description.
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Supported syntax:
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^ Match beginning of a buffer
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$ Match end of a buffer
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() Grouping and substring capturing
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[...] Match any character from set
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[^...] Match any character but ones from set
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\s Match whitespace
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\S Match non-whitespace
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\d Match decimal digit
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\r Match carriage return
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\n Match newline
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+ Match one or more times (greedy)
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+? Match one or more times (non-greedy)
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* Match zero or more times (greedy)
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*? Match zero or more times (non-greedy)
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? Match zero or once
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\xDD Match byte with hex value 0xDD
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\meta Match one of the meta character: ^$().[*+\?
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Match string buffer "buf" of length "buf_len" against "regexp", which should
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conform the syntax outlined above. "options" could be either 0 or
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SLRE_CASE_INSENSITIVE for case-insensitive match. If regular expression
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"regexp" contains brackets, slre_match() will capture the respective
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substring into the passed placeholder. Thus, each opening parenthesis
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should correspond to three arguments passed:
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placeholder_type, placeholder_size, placeholder_address
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Usage example: parsing HTTP request line.
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char method[10], uri[100];
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int http_version_minor, http_version_major;
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const char *error;
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const char *request = " \tGET /index.html HTTP/1.0\r\n\r\n";
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error = slre_match(0, "^\\s*(GET|POST)\\s+(\\S+)\\s+HTTP/(\\d)\\.(\\d)",
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request, strlen(request),
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SLRE_STRING, sizeof(method), method,
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SLRE_STRING, sizeof(uri), uri,
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SLRE_INT,sizeof(http_version_major),&http_version_major,
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SLRE_INT,sizeof(http_version_minor),&http_version_minor);
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if (error != NULL) {
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printf("Error parsing HTTP request: %s\n", error);
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} else {
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printf("Requested URI: %s\n", uri);
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}
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Return:
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NULL: string matched and all captures successfully made
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non-NULL: in this case, the return value is an error string */
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#ifndef SLRE_H
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#define SLRE_H
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enum slre_option {SLRE_CASE_INSENSITIVE = 1};
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enum slre_capture {SLRE_STRING, SLRE_INT, SLRE_FLOAT};
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const char *slre_match(enum slre_option options, const char *regexp,
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const char *buf, int buf_len, ...);
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#endif /* SLRE_H */
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