1 /* Locale-specific memory comparison.
3 Copyright (C) 1999, 2002-2004, 2006, 2009-2010 Free Software Foundation,
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Contributed by Paul Eggert <eggert@twinsun.com>. */
29 /* Ensure strcoll operates on the entire input strings, in case they contain
33 strcoll_loop (const char *s1, size_t s1len, const char *s2, size_t s2len)
36 while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
38 /* strcoll found no difference, but perhaps it was fooled by NUL
39 characters in the data. Work around this problem by advancing
40 past the NUL chars. */
41 size_t size1 = strlen (s1) + 1;
42 size_t size2 = strlen (s2) + 1;
63 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
64 to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
65 adjacent. Perhaps temporarily modify the bytes after S1 and S2,
66 but restore their original contents before returning. Set errno to an
67 error number if there is an error, and to zero otherwise. */
70 memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
74 /* strcoll is slow on many platforms, so check for the common case
75 where the arguments are bytewise equal. Otherwise, walk through
76 the buffers using strcoll on each substring. */
78 if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
91 diff = strcoll_loop (s1, s1len, s2, s2len);
100 /* Like memcoll, but S1 and S2 are known to be NUL delimited, thus no
101 modification to S1 or S2 are needed. */
103 memcoll0 (const char *s1, size_t s1len, const char *s2, size_t s2len)
106 if (!(s1len > 0 && s1[s1len] == '\0'))
108 if (!(s2len > 0 && s2[s2len] == '\0'))
111 if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
117 diff = strcoll_loop (s1, s1len, s2, s2len);