Mercurial > hg > octave-shane > gnulib-hg
annotate lib/regex-quote.c @ 14409:ee532a615968
regex-quote: Fix creation of POSIX extended regular expressions.
* lib/regex-quote.c (ere_special): Add grouping and alternation
operators.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 06 Mar 2011 14:25:49 +0100 |
| parents | 97fc9a21a8fb |
| children | 0a972f366396 |
| rev | line source |
|---|---|
| 13728 | 1 /* Construct a regular expression from a literal string. |
|
14079
97fc9a21a8fb
maint: update almost all copyright ranges to include 2011
Jim Meyering <meyering@redhat.com>
parents:
13728
diff
changeset
|
2 Copyright (C) 1995, 2010-2011 Free Software Foundation, Inc. |
| 13728 | 3 Written by Bruno Haible <haible@clisp.cons.org>, 2010. |
| 4 | |
| 5 This program is free software: you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 3 of the License, or | |
| 8 (at your option) any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 17 | |
| 18 #include <config.h> | |
| 19 | |
| 20 /* Specification. */ | |
| 21 #include "regex-quote.h" | |
| 22 | |
| 23 #include <string.h> | |
| 24 | |
| 25 #include "mbuiter.h" | |
| 26 #include "xalloc.h" | |
| 27 | |
| 28 /* Characters that are special in a BRE. */ | |
| 29 static const char bre_special[] = "$^.*[]\\"; | |
| 30 | |
| 31 /* Characters that are special in an ERE. */ | |
|
14409
ee532a615968
regex-quote: Fix creation of POSIX extended regular expressions.
Bruno Haible <bruno@clisp.org>
parents:
14079
diff
changeset
|
32 static const char ere_special[] = "$^.*[]\\+?{}()|"; |
| 13728 | 33 |
| 34 size_t | |
| 35 regex_quote_length (const char *string, int cflags) | |
| 36 { | |
| 37 const char *special = (cflags != 0 ? ere_special : bre_special); | |
| 38 size_t length; | |
| 39 mbui_iterator_t iter; | |
| 40 | |
| 41 length = 0; | |
| 42 for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter)) | |
| 43 { | |
| 44 /* We know that special contains only ASCII characters. */ | |
| 45 if (mb_len (mbui_cur (iter)) == 1 | |
| 46 && strchr (special, * mbui_cur_ptr (iter))) | |
| 47 length += 1; | |
| 48 length += mb_len (mbui_cur (iter)); | |
| 49 } | |
| 50 return length; | |
| 51 } | |
| 52 | |
| 53 /* Copies the quoted string to p and returns the incremented p. | |
| 54 There must be room for regex_quote_length (string, cflags) + 1 bytes at p. | |
| 55 */ | |
| 56 char * | |
| 57 regex_quote_copy (char *p, const char *string, int cflags) | |
| 58 { | |
| 59 const char *special = (cflags != 0 ? ere_special : bre_special); | |
| 60 mbui_iterator_t iter; | |
| 61 | |
| 62 for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter)) | |
| 63 { | |
| 64 /* We know that special contains only ASCII characters. */ | |
| 65 if (mb_len (mbui_cur (iter)) == 1 | |
| 66 && strchr (special, * mbui_cur_ptr (iter))) | |
| 67 *p++ = '\\'; | |
| 68 memcpy (p, mbui_cur_ptr (iter), mb_len (mbui_cur (iter))); | |
| 69 p += mb_len (mbui_cur (iter)); | |
| 70 } | |
| 71 return p; | |
| 72 } | |
| 73 | |
| 74 /* Returns the freshly allocated quoted string. */ | |
| 75 char * | |
| 76 regex_quote (const char *string, int cflags) | |
| 77 { | |
| 78 size_t length = regex_quote_length (string, cflags); | |
| 79 char *result = XNMALLOC (length + 1, char); | |
| 80 char *p; | |
| 81 | |
| 82 p = result; | |
| 83 p = regex_quote_copy (p, string, cflags); | |
| 84 *p = '\0'; | |
| 85 return result; | |
| 86 } |