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