/* Locale-specific memory comparison.
- Copyright (C) 1999, 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2002-2004, 2006, 2009-2013 Free Software Foundation,
+ Inc.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ the Free Software Foundation; either version 3 of the License, 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
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Contributed by Paul Eggert <eggert@twinsun.com>. */
#include "memcoll.h"
#include <errno.h>
+#include <stdlib.h>
#include <string.h>
+/* Compare S1 (with size S1SIZE) and S2 (with length S2SIZE) according
+ to the LC_COLLATE locale. S1 and S2 are both blocks of memory with
+ nonzero sizes, and the last byte in each block must be a null byte.
+ Set errno to an error number if there is an error, and to zero
+ otherwise. */
+static int
+strcoll_loop (char const *s1, size_t s1size, char const *s2, size_t s2size)
+{
+ int diff;
+
+ 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;
+ s1size -= size1;
+ s2size -= size2;
+
+ if (s1size == 0)
+ return - (s2size != 0);
+ if (s2size == 0)
+ return 1;
+ }
+
+ return diff;
+}
+
/* 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,
{
int diff;
-#if HAVE_STRCOLL
-
/* strcoll is slow on many platforms, so check for the common case
where the arguments are bytewise equal. Otherwise, walk through
the buffers using strcoll on each substring. */
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;
- }
+ s1[s1len] = '\0';
+ s2[s2len] = '\0';
-#else
+ diff = strcoll_loop (s1, s1len + 1, s2, s2len + 1);
- diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
- if (! diff)
- diff = s1len < s2len ? -1 : s1len != s2len;
- errno = 0;
-
-#endif
+ s1[s1len] = n1;
+ s2[s2len] = n2;
+ }
return diff;
}
+
+/* Compare S1 (a memory block of size S1SIZE, with a NUL as last byte)
+ and S2 (a memory block of size S2SIZE, with a NUL as last byte)
+ according to the LC_COLLATE locale. S1SIZE and S2SIZE must be > 0.
+ Set errno to an error number if there is an error, and to zero
+ otherwise. */
+int
+memcoll0 (char const *s1, size_t s1size, char const *s2, size_t s2size)
+{
+ if (s1size == s2size && memcmp (s1, s2, s1size) == 0)
+ {
+ errno = 0;
+ return 0;
+ }
+ else
+ return strcoll_loop (s1, s1size, s2, s2size);
+}