1 /* Locale-specific memory comparison.
2 Copyright 1999 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Contributed by Paul Eggert <eggert@twinsun.com>. */
47 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
48 to the LC_COLLATE locale. S1 and S2 do not overlap, but may be
49 adjacent. Temporarily modify the bytes after S1 and S2, but
50 restore their original contents before returning. */
52 memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
58 /* We will temporarily set the bytes after S1 and S2 to zero, so if
59 S1 and S2 are adjacent, compare to a temporary copy of the
60 earlier, to avoid temporarily stomping on the later. */
64 char *s2copy = alloca (s2len + 1);
65 memcpy (s2copy, s2, s2len);
71 char *s1copy = alloca (s1len + 1);
72 memcpy (s1copy, s1, s1len);
76 n1 = s1[s1len]; s1[s1len++] = '\0';
77 n2 = s2[s2len]; s2[s2len++] = '\0';
79 while (! (diff = strcoll (s1, s2)))
81 /* strcoll found no difference, but perhaps it was fooled by NUL
82 characters in the data. Work around this problem by advancing
83 past the NUL chars. */
84 size_t size1 = strlen (s1) + 1;
85 size_t size2 = strlen (s2) + 1;