Mercurial > hg > octave-kai > gnulib-hg
annotate lib/mbscasecmp.c @ 10622:ac6f431cc95d
New module 'fclose'.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sat, 11 Oct 2008 14:18:29 +0200 |
| parents | bbbbbf4cd1c5 |
| children | a0bbe1a6f787 |
| rev | line source |
|---|---|
| 8089 | 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>, 2005, | |
| 4 based on earlier glibc code. | |
| 5 | |
|
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bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8091
diff
changeset
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6 This program is free software: you can redistribute it and/or modify |
| 8089 | 7 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:
8091
diff
changeset
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8 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:
8091
diff
changeset
|
9 (at your option) any later version. |
| 8089 | 10 |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 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:
8091
diff
changeset
|
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 8089 | 18 |
| 19 #include <config.h> | |
| 20 | |
| 21 /* Specification. */ | |
| 22 #include <string.h> | |
| 23 | |
| 24 #include <ctype.h> | |
| 25 #include <limits.h> | |
| 26 | |
| 27 #if HAVE_MBRTOWC | |
| 28 # include "mbuiter.h" | |
| 29 #endif | |
| 30 | |
| 31 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) | |
| 32 | |
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8091
ebf2b19b5684
New module 'mbscasecmp'. strcasecmp is not expected to work with multibyte
Bruno Haible <bruno@clisp.org>
parents:
8089
diff
changeset
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33 /* Compare the character strings S1 and S2, ignoring case, returning less than, |
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ebf2b19b5684
New module 'mbscasecmp'. strcasecmp is not expected to work with multibyte
Bruno Haible <bruno@clisp.org>
parents:
8089
diff
changeset
|
34 equal to or greater than zero if S1 is lexicographically less than, equal to |
|
ebf2b19b5684
New module 'mbscasecmp'. strcasecmp is not expected to work with multibyte
Bruno Haible <bruno@clisp.org>
parents:
8089
diff
changeset
|
35 or greater than S2. |
| 8089 | 36 Note: This function may, in multibyte locales, return 0 for strings of |
| 37 different lengths! */ | |
| 38 int | |
|
8091
ebf2b19b5684
New module 'mbscasecmp'. strcasecmp is not expected to work with multibyte
Bruno Haible <bruno@clisp.org>
parents:
8089
diff
changeset
|
39 mbscasecmp (const char *s1, const char *s2) |
| 8089 | 40 { |
| 41 if (s1 == s2) | |
| 42 return 0; | |
| 43 | |
| 44 /* Be careful not to look at the entire extent of s1 or s2 until needed. | |
| 45 This is useful because when two strings differ, the difference is | |
| 46 most often already in the very few first characters. */ | |
| 47 #if HAVE_MBRTOWC | |
| 48 if (MB_CUR_MAX > 1) | |
| 49 { | |
| 50 mbui_iterator_t iter1; | |
| 51 mbui_iterator_t iter2; | |
| 52 | |
| 53 mbui_init (iter1, s1); | |
| 54 mbui_init (iter2, s2); | |
| 55 | |
| 56 while (mbui_avail (iter1) && mbui_avail (iter2)) | |
| 57 { | |
| 58 int cmp = mb_casecmp (mbui_cur (iter1), mbui_cur (iter2)); | |
| 59 | |
| 60 if (cmp != 0) | |
| 61 return cmp; | |
| 62 | |
| 63 mbui_advance (iter1); | |
| 64 mbui_advance (iter2); | |
| 65 } | |
| 66 if (mbui_avail (iter1)) | |
| 67 /* s2 terminated before s1. */ | |
| 68 return 1; | |
| 69 if (mbui_avail (iter2)) | |
| 70 /* s1 terminated before s2. */ | |
| 71 return -1; | |
| 72 return 0; | |
| 73 } | |
| 74 else | |
| 75 #endif | |
| 76 { | |
| 77 const unsigned char *p1 = (const unsigned char *) s1; | |
| 78 const unsigned char *p2 = (const unsigned char *) s2; | |
| 79 unsigned char c1, c2; | |
| 80 | |
| 81 do | |
| 82 { | |
| 83 c1 = TOLOWER (*p1); | |
| 84 c2 = TOLOWER (*p2); | |
| 85 | |
| 86 if (c1 == '\0') | |
| 87 break; | |
| 88 | |
| 89 ++p1; | |
| 90 ++p2; | |
| 91 } | |
| 92 while (c1 == c2); | |
| 93 | |
| 94 if (UCHAR_MAX <= INT_MAX) | |
| 95 return c1 - c2; | |
| 96 else | |
| 97 /* On machines where 'char' and 'int' are types of the same size, the | |
| 98 difference of two 'unsigned char' values - including the sign bit - | |
| 99 doesn't fit in an 'int'. */ | |
| 100 return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); | |
| 101 } | |
| 102 } |