mirror of
git://git.sv.gnu.org/coreutils.git
synced 2026-02-19 22:02:21 +02:00
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* Locale-specific memory comparison.
|
|
Copyright 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* Contributed by Paul Eggert <eggert@twinsun.com>. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#ifndef __GNUC__
|
|
# ifdef HAVE_ALLOCA_H
|
|
# include <alloca.h>
|
|
# else
|
|
# ifdef _AIX
|
|
# pragma alloca
|
|
# else
|
|
# ifdef _WIN32
|
|
# include <malloc.h>
|
|
# include <io.h>
|
|
# else
|
|
# ifndef alloca
|
|
char *alloca ();
|
|
# endif
|
|
# endif
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#if HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
|
|
/* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
|
|
to the LC_COLLATE locale. S1 and S2 do not overlap, but may be
|
|
adjacent. Temporarily modify the bytes after S1 and S2, but
|
|
restore their original contents before returning. */
|
|
int
|
|
memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
|
|
{
|
|
int diff;
|
|
char n1;
|
|
char n2;
|
|
|
|
/* We will temporarily set the bytes after S1 and S2 to zero, so if
|
|
S1 and S2 are adjacent, compare to a temporary copy of the
|
|
earlier, to avoid temporarily stomping on the later. */
|
|
|
|
if (s1 + s1len == s2)
|
|
{
|
|
char *s2copy = alloca (s2len + 1);
|
|
memcpy (s2copy, s2, s2len);
|
|
s2 = s2copy;
|
|
}
|
|
|
|
if (s2 + s2len == s1)
|
|
{
|
|
char *s1copy = alloca (s1len + 1);
|
|
memcpy (s1copy, s1, s1len);
|
|
s1 = s1copy;
|
|
}
|
|
|
|
n1 = s1[s1len]; s1[s1len++] = '\0';
|
|
n2 = s2[s2len]; s2[s2len++] = '\0';
|
|
|
|
while (! (diff = strcoll (s1, s2)))
|
|
{
|
|
/* 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;
|
|
|
|
return diff;
|
|
}
|