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101 lines
3 KiB
C
101 lines
3 KiB
C
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/*
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* Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
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* All rights reserved
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*
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* "THE BEER-WARE LICENSE" (Revision 42):
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* Sergey Lyubka wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return.
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*/
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/*
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* Downloaded Sat Nov 5 17:42:08 CET 2011 at
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* http://slre.sourceforge.net/1.0/slre.h
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*/
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/*
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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.sourceforge.net for detailed description.
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*
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* Usage example (parsing HTTP request):
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*
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* struct slre slre;
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* struct cap captures[4 + 1]; // Number of braket pairs + 1
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* ...
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*
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* slre_compile(&slre,"^(GET|POST) (\S+) HTTP/(\S+?)\r\n");
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*
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* if (slre_match(&slre, buf, len, captures)) {
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* printf("Request line length: %d\n", captures[0].len);
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* printf("Method: %.*s\n", captures[1].len, captures[1].ptr);
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* printf("URI: %.*s\n", captures[2].len, captures[2].ptr);
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* }
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*
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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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*/
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#ifndef SLRE_HEADER_DEFINED
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#define SLRE_HEADER_DEFINED
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/*
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* Compiled regular expression
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*/
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struct slre {
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unsigned char code[256];
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unsigned char data[256];
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int code_size;
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int data_size;
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int num_caps; /* Number of bracket pairs */
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int anchored; /* Must match from string start */
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const char *err_str; /* Error string */
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};
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/*
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* Captured substring
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*/
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struct cap {
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const char *ptr; /* Pointer to the substring */
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int len; /* Substring length */
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};
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/*
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* Compile regular expression. If success, 1 is returned.
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* If error, 0 is returned and slre.err_str points to the error message.
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*/
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int slre_compile(struct slre *, const char *re);
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/*
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* Return 1 if match, 0 if no match.
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* If `captured_substrings' array is not NULL, then it is filled with the
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* values of captured substrings. captured_substrings[0] element is always
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* a full matched substring. The round bracket captures start from
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* captured_substrings[1].
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* It is assumed that the size of captured_substrings array is enough to
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* hold all captures. The caller function must make sure it is! So, the
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* array_size = number_of_round_bracket_pairs + 1
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*/
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int slre_match(const struct slre *, const char *buf, int buf_len,
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struct cap *captured_substrings);
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#ifdef SLRE_TEST
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void slre_dump(const struct slre *r, FILE *fp);
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#endif /* SLRE_TEST */
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#endif /* SLRE_HEADER_DEFINED */
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