/* Locale-specific memory comparison.
- Copyright (C) 1999, 2002-2004, 2006, 2009 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2002-2004, 2006, 2009-2010 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
#include "memcoll.h"
#include <errno.h>
+#include <stdlib.h>
#include <string.h>
+/* Ensure strcoll operates on the entire input strings, in case they contain
+ NUL bytes. */
+
+static inline int
+strcoll_loop (const char *s1, size_t s1len, const char *s2, size_t s2len)
+{
+ 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;
+ s1len -= size1;
+ s2len -= size2;
+
+ if (s1len == 0)
+ {
+ if (s2len != 0)
+ diff = -1;
+ break;
+ }
+ else if (s2len == 0)
+ {
+ diff = 1;
+ break;
+ }
+ }
+ 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,
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
-
/* 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. */
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;
- }
- }
+ diff = strcoll_loop (s1, s1len, s2, s2len);
s1[s1len - 1] = n1;
s2[s2len - 1] = n2;
}
-#else
+ return diff;
+}
- diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
- if (! diff)
- diff = s1len < s2len ? -1 : s1len != s2len;
- errno = 0;
+/* Like memcoll, but S1 and S2 are known to be NUL delimited, thus no
+ modification to S1 or S2 are needed. */
+int
+memcoll0 (const char *s1, size_t s1len, const char *s2, size_t s2len)
+{
+ int diff;
+ if (!(s1len > 0 && s1[s1len] == '\0'))
+ abort ();
+ if (!(s2len > 0 && s2[s2len] == '\0'))
+ abort ();
-#endif
+ if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
+ {
+ errno = 0;
+ diff = 0;
+ }
+ else
+ diff = strcoll_loop (s1, s1len, s2, s2len);
return diff;
}