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 3 of the License, or
7 (at your option) any later version.
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, see <http://www.gnu.org/licenses/>. */
17 /* Written by Jim Meyering. */
21 #include "memcasecmp.h"
26 /* Like memcmp, but ignore differences in case.
27 Convert to upper case (not lower) before comparing so that
28 join -i works with sort -f. */
31 memcasecmp (const void *vs1, const void *vs2, size_t n)
36 for (i = 0; i < n; i++)
38 unsigned char u1 = s1[i];
39 unsigned char u2 = s2[i];
40 int U1 = toupper (u1);
41 int U2 = toupper (u2);
42 int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
43 : U1 < U2 ? -1 : U2 < U1);