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![Wolfgang Denk](/assets/img/avatar_default.png)
Downloaded from http://slre.sourceforge.net/ and adapted for U-Boot environment. Used to implement regex operations on environment variables. Code size is ~ 3.5 KiB on PPC. To enable this code, define the CONFIG_REGEX option in your board config file. Note: There are more recent versions of the SLRE library available at http://slre.googlecode.com ; unfortunately, the new code has a heavily reorked API which makes it less usable for our purposes: - the return code is strings, which are more difficult to process - we don't get any information any more which sub-string of the data was matched by the given regex - it is much more cumbersome to work with arbitrary expressions, where for example the number of substrings for capturing are not known at compile time Also, there does not seem to be any real changes or improvements of the functionality. Because of this, we deliberately stick with the older code. Note 2: the test code (built when SLRE_TEST is defined) was modified to allow for more extensive testing; now we can test the regexp matching on all lines on a text file (instead of the whole data in the file as a single block). Signed-off-by: Wolfgang Denk <wd@denx.de>
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/*
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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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