/* Case-insensitive buffer comparator.
- Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1996-1997, 2000, 2003, 2006, 2009-2010 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/>. */
/* Written by Jim Meyering. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#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 TOUPPER(Char) toupper (Char)
-#else
-# define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
-#endif
+#include <config.h>
#include "memcasecmp.h"
+#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. */
{
unsigned char u1 = s1[i];
unsigned char u2 = s2[i];
- int diff = TOUPPER (u1) - TOUPPER (u2);
+ 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 diff;
}
return 0;
}