Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/mbspcasecmp.c @ 10001:facc928673d7
Declare rpmatch.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Tue, 29 Apr 2008 02:55:59 +0200 |
| parents | bbbbbf4cd1c5 |
| children | a0bbe1a6f787 |
| rev | line source |
|---|---|
| 8159 | 1 /* Case-insensitive string comparison function. |
| 2 Copyright (C) 1998-1999, 2005-2007 Free Software Foundation, Inc. | |
| 3 Written by Bruno Haible <bruno@clisp.org>, 2007. | |
| 4 | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8159
diff
changeset
|
5 This program is free software: you can redistribute it and/or modify |
| 8159 | 6 it under the terms of the GNU General Public License as published by |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8159
diff
changeset
|
7 the Free Software Foundation; either version 3 of the License, or |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8159
diff
changeset
|
8 (at your option) any later version. |
| 8159 | 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 | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8159
diff
changeset
|
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 8159 | 17 |
| 18 #include <config.h> | |
| 19 | |
| 20 /* Specification. */ | |
| 21 #include <string.h> | |
| 22 | |
| 23 #include <ctype.h> | |
| 24 | |
| 25 #if HAVE_MBRTOWC | |
| 26 # include "mbuiter.h" | |
| 27 #endif | |
| 28 | |
| 29 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) | |
| 30 | |
| 31 /* Compare the initial segment of the character string STRING consisting of | |
| 32 at most mbslen (PREFIX) characters with the character string PREFIX, | |
| 33 ignoring case, returning less than, equal to or greater than zero if this | |
| 34 initial segment is lexicographically less than, equal to or greater than | |
| 35 PREFIX. | |
| 36 Note: This function may, in multibyte locales, return 0 if STRING is of | |
| 37 smaller length than PREFIX! */ | |
| 38 char * | |
| 39 mbspcasecmp (const char *string, const char *prefix) | |
| 40 { | |
| 41 /* This is essentially the same as | |
| 42 mbsncasecmp (string, prefix, mbslen (prefix)) | |
| 43 just with small optimizations. */ | |
| 44 if (string == prefix) | |
| 45 return (char *) (string + strlen (string)); | |
| 46 | |
| 47 /* Be careful not to look at the entire extent of STRING or PREFIX until | |
| 48 needed. This is useful because when two strings differ, the difference is | |
| 49 most often already in the very few first characters. */ | |
| 50 #if HAVE_MBRTOWC | |
| 51 if (MB_CUR_MAX > 1) | |
| 52 { | |
| 53 mbui_iterator_t iter1; | |
| 54 mbui_iterator_t iter2; | |
| 55 | |
| 56 mbui_init (iter1, string); | |
| 57 mbui_init (iter2, prefix); | |
| 58 | |
| 59 while (mbui_avail (iter1) && mbui_avail (iter2)) | |
| 60 { | |
| 61 int cmp = mb_casecmp (mbui_cur (iter1), mbui_cur (iter2)); | |
| 62 | |
| 63 if (cmp != 0) | |
| 64 return NULL; | |
| 65 | |
| 66 mbui_advance (iter1); | |
| 67 mbui_advance (iter2); | |
| 68 } | |
| 69 if (!mbui_avail (iter2)) | |
| 70 /* PREFIX equals STRING or is terminated before STRING. */ | |
| 71 return (char *) mbui_cur_ptr (iter1); | |
| 72 else | |
| 73 /* STRING terminated before PREFIX. */ | |
| 74 return NULL; | |
| 75 } | |
| 76 else | |
| 77 #endif | |
| 78 { | |
| 79 const unsigned char *p1 = (const unsigned char *) string; | |
| 80 const unsigned char *p2 = (const unsigned char *) prefix; | |
| 81 unsigned char c1, c2; | |
| 82 | |
| 83 for (; ; p1++, p2++) | |
| 84 { | |
| 85 c1 = TOLOWER (*p1); | |
| 86 c2 = TOLOWER (*p2); | |
| 87 | |
| 88 if (c2 == '\0' || c1 != c2) | |
| 89 break; | |
| 90 } | |
| 91 | |
| 92 if (c2 == '\0') | |
| 93 /* PREFIX equals STRING or is terminated before STRING. */ | |
| 94 return (char *) p1; | |
| 95 else | |
| 96 /* STRING terminated before PREFIX. */ | |
| 97 return NULL; | |
| 98 } | |
| 99 } |