Mercurial > hg > octave-shane > gnulib-hg
annotate lib/wcsxfrm-impl.h @ 17480:f40b3156a43e
selinux-at: omit unnecessary include
* lib/selinux-at.c: Don't include dosname.h; not needed, since
this source file doesn't use its macros, and subsidiary files that
use the macros already include it.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 23 Aug 2013 13:53:46 -0700 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
| 14294 | 1 /* Transform wide string for comparison using the current locale. |
|
17249
e542fd46ad6f
maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
parents:
16201
diff
changeset
|
2 Copyright (C) 2011-2013 Free Software Foundation, Inc. |
| 14294 | 3 Written by Bruno Haible <bruno@clisp.org>, 2011. |
| 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 size_t | |
| 19 wcsxfrm (wchar_t *s1, const wchar_t *s2, size_t n) | |
| 20 { | |
| 21 char mbbuf2[1024]; | |
| 22 char *mbs2; | |
| 23 | |
| 24 { | |
| 25 int saved_errno = errno; | |
| 26 size_t result; | |
| 27 | |
| 28 /* Convert s2 to a multibyte string, trying to avoid malloc(). */ | |
| 29 { | |
| 30 size_t ret; | |
| 31 | |
| 32 ret = wcstombs (mbbuf2, s2, sizeof (mbbuf2)); | |
| 33 if (ret == (size_t)-1) | |
| 34 goto failed; | |
| 35 if (ret < sizeof (mbbuf2)) | |
| 36 mbs2 = mbbuf2; | |
| 37 else | |
| 38 { | |
| 39 size_t need = wcstombs (NULL, s2, 0); | |
| 40 if (need == (size_t)-1) | |
| 41 goto failed; | |
| 42 mbs2 = (char *) malloc (need + 1); | |
| 43 if (mbs2 == NULL) | |
| 44 goto out_of_memory; | |
| 45 ret = wcstombs (mbs2, s2, need + 1); | |
| 46 if (ret != need) | |
| 47 abort (); | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 /* Transform the multibyte string. */ | |
| 52 errno = 0; | |
| 53 result = strxfrm ((char *)s1, mbs2, n); | |
| 54 if (errno != 0) | |
| 55 { | |
| 56 /* An error occurred. */ | |
| 57 if (mbs2 != mbbuf2) | |
| 58 { | |
| 59 saved_errno = errno; | |
| 60 free (mbs2); | |
| 61 errno = saved_errno; | |
| 62 } | |
| 63 return 0; | |
| 64 } | |
| 65 | |
| 66 if (result < n) | |
| 67 { | |
| 68 /* Convert the result by mapping char[] -> wchar_t[]. | |
| 69 Since strcmp() compares the elements as 'unsigned char' values, | |
| 70 whereas wcscmp() compares the elements as 'wchar_t' values, we need | |
| 71 to map 1 'unsigned char' to 1 'wchar_t'. (We could also map 2 | |
| 72 consecutive 'unsigned char' values to 1 'wchar_t' value, but this is | |
| 73 not needed. */ | |
| 74 wchar_t *wcp = s1 + n; | |
| 75 char *cp = (char *)s1 + n; | |
| 76 | |
| 77 while (wcp > s1) | |
| 78 *--wcp = (wchar_t) (unsigned char) *--cp; | |
| 79 } | |
| 80 | |
| 81 if (mbs2 != mbbuf2) | |
| 82 free (mbs2); | |
| 83 | |
| 84 /* No error. */ | |
| 85 errno = saved_errno; | |
| 86 return result; | |
| 87 } | |
| 88 | |
| 89 out_of_memory: | |
| 90 errno = ENOMEM; | |
| 91 return 0; | |
| 92 | |
| 93 failed: | |
| 94 errno = EILSEQ; | |
| 95 return 0; | |
| 96 } |