1 /* Case-insensitive buffer comparator.
2 Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Jim Meyering. */
24 #include <sys/types.h>
27 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
28 # define IN_CTYPE_DOMAIN(Char) 1
30 # define IN_CTYPE_DOMAIN(Char) isascii(Char)
32 #define ISLOWER(Char) (IN_CTYPE_DOMAIN (Char) && islower (Char))
34 #if _LIBC || STDC_HEADERS
35 # define TOUPPER(Char) toupper (Char)
37 # define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
40 #include "memcasecmp.h"
42 /* Like memcmp, but ignore differences in case.
43 Convert to upper case (not lower) before comparing so that
44 join -i works with sort -f. */
47 memcasecmp (const void *vs1, const void *vs2, size_t n)
50 unsigned char const *s1 = (unsigned char const *) vs1;
51 unsigned char const *s2 = (unsigned char const *) vs2;
52 for (i = 0; i < n; i++)
54 unsigned char u1 = *s1++;
55 unsigned char u2 = *s2++;
56 if (TOUPPER (u1) != TOUPPER (u2))
57 return TOUPPER (u1) - TOUPPER (u2);