-#ifdef HAVE_CONFIG_H
+/* Case-insensitive buffer comparator.
+ Copyright (C) 1996, 1997, 2000 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. */
+
+/* Written by Jim Meyering. */
+
+#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#include <ctype.h>
+#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
+# define IN_CTYPE_DOMAIN(Char) 1
+#else
+# define IN_CTYPE_DOMAIN(Char) isascii(Char)
+#endif
+#define ISLOWER(Char) (IN_CTYPE_DOMAIN (Char) && islower (Char))
+
#if _LIBC || STDC_HEADERS
-# define TOLOWER(c) tolower (c)
+# define TOUPPER(Char) toupper (Char)
#else
-# define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
+# define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
#endif
#include "memcasecmp.h"
-/* Like memcmp, but ignore differences in case. */
+/* Like memcmp, but ignore differences in case.
+ Convert to upper case (not lower) before comparing so that
+ join -i works with sort -f. */
int
memcasecmp (const void *vs1, const void *vs2, size_t n)
{
unsigned int i;
- unsigned char *s1 = (unsigned char *) vs1;
- unsigned char *s2 = (unsigned char *) vs2;
+ unsigned char const *s1 = (unsigned char const *) vs1;
+ unsigned char const *s2 = (unsigned char const *) vs2;
for (i = 0; i < n; i++)
{
unsigned char u1 = *s1++;
unsigned char u2 = *s2++;
- if (TOLOWER (u1) != TOLOWER (u2))
- return TOLOWER (u1) - TOLOWER (u2);
+ if (TOUPPER (u1) != TOUPPER (u2))
+ return TOUPPER (u1) - TOUPPER (u2);
}
return 0;
}