strcasecmp.c revision 706f2543 
1/*
2 * Copyright (c) 1987, 1993
3 *      The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifdef HAVE_DIX_CONFIG_H
31#include <dix-config.h>
32#endif
33
34#include <ctype.h>
35#include "dix.h"
36
37#ifdef NEED_STRCASECMP
38int
39xstrcasecmp(const char *str1, const char *str2)
40{
41    const u_char *us1 = (const u_char *)str1, *us2 = (const u_char *)str2;
42
43    while (tolower(*us1) == tolower(*us2)) {
44        if (*us1++ == '\0')
45            return 0;
46        us2++;
47    }
48
49    return (tolower(*us1) - tolower(*us2));
50}
51#endif
52
53#ifdef NEED_STRNCASECMP
54int
55xstrncasecmp(const char *s1, const char *s2, size_t n)
56{
57    if (n != 0) {
58        const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
59
60        do {
61            if (tolower(*us1) != tolower(*us2++))
62                return (tolower(*us1) - tolower(*--us2));
63            if (*us1++ == '\0')
64                break;
65        } while (--n != 0);
66    }
67
68    return 0;
69}
70#endif
71