+/* Case-insensitive buffer comparator.
+ Copyright (C) 1996, 1997 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. */
+
+/* Jim Meyering (meyering@na-net.ornl.gov) */
+
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <ctype.h>
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
-#define ISASCII(c) 1
+# define IN_CTYPE_DOMAIN(c) 1
#else
-#define ISASCII(c) isascii(c)
+# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
-#define ISUPPER(c) (ISASCII (c) && isupper (c))
+#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
#if _LIBC || STDC_HEADERS
-# define TOLOWER(c) tolower (c)
+# define TOUPPER(c) toupper (c)
#else
-# define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
+# define TOUPPER(c) (ISLOWER (c) ? toupper (c) : (c))
#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 (vs1, vs2, n)
{
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;
}