-/* strcasecmp.c -- case insensitive string comparator
- Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+/* Case-insensitive string comparison function.
+ Copyright (C) 1998-1999, 2005-2007, 2009-2011 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
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-#ifdef LENGTH_LIMIT
-# define STRXCASECMP_FUNCTION strncasecmp
-# define STRXCASECMP_DECLARE_N , size_t n
-# define LENGTH_LIMIT_EXPR(Expr) Expr
-#else
-# define STRXCASECMP_FUNCTION strcasecmp
-# define STRXCASECMP_DECLARE_N /* empty */
-# define LENGTH_LIMIT_EXPR(Expr) 0
-#endif
+/* Specification. */
+#include <string.h>
-#include <stddef.h>
#include <ctype.h>
+#include <limits.h>
#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
-/* Compare {{no more than N characters of }}strings S1 and S2,
- ignoring case, returning less than, equal to or
- greater than zero if S1 is lexicographically less
- than, equal to or greater than S2. */
+/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
+ greater than zero if S1 is lexicographically less than, equal to or greater
+ than S2.
+ Note: This function does not work with multibyte strings! */
int
-STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_N)
+strcasecmp (const char *s1, const char *s2)
{
- register const unsigned char *p1 = (const unsigned char *) s1;
- register const unsigned char *p2 = (const unsigned char *) s2;
+ const unsigned char *p1 = (const unsigned char *) s1;
+ const unsigned char *p2 = (const unsigned char *) s2;
unsigned char c1, c2;
- if (p1 == p2 || LENGTH_LIMIT_EXPR (n == 0))
+ if (p1 == p2)
return 0;
do
c1 = TOLOWER (*p1);
c2 = TOLOWER (*p2);
- if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
- break;
+ if (c1 == '\0')
+ break;
++p1;
++p2;
}
while (c1 == c2);
- return c1 - c2;
+ if (UCHAR_MAX <= INT_MAX)
+ return c1 - c2;
+ else
+ /* On machines where 'char' and 'int' are types of the same size, the
+ difference of two 'unsigned char' values - including the sign bit -
+ doesn't fit in an 'int'. */
+ return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
}