/* Case-insensitive buffer comparator.
- Copyright (C) 1996 Free Software Foundation, Inc.
+ Copyright (C) 1996-1997, 2000, 2003, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-/* Jim Meyering (meyering@na-net.ornl.gov) */
+/* Written by Jim Meyering. */
-#ifdef 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(c) 1
-#else
-#define IN_CTYPE_DOMAIN(c) isascii(c)
-#endif
-#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
-
-#if _LIBC || STDC_HEADERS
-# define TOLOWER(c) tolower (c)
-#else
-# define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
-#endif
+#include <config.h>
#include "memcasecmp.h"
-/* Like memcmp, but ignore differences in case. */
+#include <ctype.h>
+#include <limits.h>
+
+/* 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 (vs1, vs2, n)
- const void *vs1;
- const void *vs2;
- size_t n;
+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;
+ size_t i;
+ char const *s1 = vs1;
+ char const *s2 = 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);
+ unsigned char u1 = s1[i];
+ unsigned char u2 = s2[i];
+ int U1 = toupper (u1);
+ int U2 = toupper (u2);
+ int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
+ : U1 < U2 ? -1 : U2 < U1);
+ if (diff)
+ return diff;
}
return 0;
}