mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-03 06:53:31 +08:00
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Locale-specific memory comparison.
|
|
Copyright (C) 1999, 2002, 2003, 2004 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* Contributed by Paul Eggert <eggert@twinsun.com>. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include "memcoll.h"
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
/* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
|
|
to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
|
|
adjacent. Perhaps temporarily modify the bytes after S1 and S2,
|
|
but restore their original contents before returning. Set errno to an
|
|
error number if there is an error, and to zero otherwise. */
|
|
int
|
|
memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
|
|
{
|
|
int diff;
|
|
|
|
#if HAVE_STRCOLL
|
|
|
|
char n1 = s1[s1len];
|
|
char n2 = s2[s2len];
|
|
|
|
s1[s1len++] = '\0';
|
|
s2[s2len++] = '\0';
|
|
|
|
while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
|
|
{
|
|
/* strcoll found no difference, but perhaps it was fooled by NUL
|
|
characters in the data. Work around this problem by advancing
|
|
past the NUL chars. */
|
|
size_t size1 = strlen (s1) + 1;
|
|
size_t size2 = strlen (s2) + 1;
|
|
s1 += size1;
|
|
s2 += size2;
|
|
s1len -= size1;
|
|
s2len -= size2;
|
|
|
|
if (s1len == 0)
|
|
{
|
|
if (s2len != 0)
|
|
diff = -1;
|
|
break;
|
|
}
|
|
else if (s2len == 0)
|
|
{
|
|
diff = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
s1[s1len - 1] = n1;
|
|
s2[s2len - 1] = n2;
|
|
|
|
#else
|
|
|
|
diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
|
|
if (! diff)
|
|
diff = s1len < s2len ? -1 : s1len != s2len;
|
|
errno = 0;
|
|
|
|
#endif
|
|
|
|
return diff;
|
|
}
|