1 /* Case-insensitive buffer comparator.
2 Copyright (C) 1996, 1997, 2000, 2003, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Jim Meyering. */
24 #include "memcasecmp.h"
29 /* Like memcmp, but ignore differences in case.
30 Convert to upper case (not lower) before comparing so that
31 join -i works with sort -f. */
34 memcasecmp (const void *vs1, const void *vs2, size_t n)
39 for (i = 0; i < n; i++)
41 unsigned char u1 = s1[i];
42 unsigned char u2 = s2[i];
43 int U1 = toupper (u1);
44 int U2 = toupper (u2);
45 int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
46 : U1 < U2 ? -1 : U2 < U1);