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>. */
28 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
29 to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
30 adjacent. Perhaps temporarily modify the bytes after S1 and S2,
31 but restore their original contents before returning. Set errno to an
32 error number if there is an error, and to zero otherwise. */
34 memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
40 /* strcoll is slow on many platforms, so check for the common case
41 where the arguments are bytewise equal. Otherwise, walk through
42 the buffers using strcoll on each substring. */
44 if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
57 while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
59 /* strcoll found no difference, but perhaps it was fooled by NUL
60 characters in the data. Work around this problem by advancing
61 past the NUL chars. */
62 size_t size1 = strlen (s1) + 1;
63 size_t size2 = strlen (s2) + 1;
88 diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
90 diff = s1len < s2len ? -1 : s1len != s2len;