Annotation of sys/lib/libkern/strncasecmp.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: strncasecmp.c,v 1.4 2004/08/07 00:38:33 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 1994 Christian E. Hopps
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by Christian E. Hopps.
18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32: #if defined(LIBC_SCCS) && !defined(lint)
33: static char *rcsid = "$Id: strncasecmp.c,v 1.4 2004/08/07 00:38:33 deraadt Exp $";
34: #endif /* LIBC_SCCS and not lint */
35:
36: #if !defined(_KERNEL) && !defined(_STANDALONE)
37: #include <string.h>
38: #else
39: #include <lib/libkern/libkern.h>
40: #endif
41:
42: int
43: strncasecmp(const char *s1, const char *s2, size_t n)
44: {
45: if (n == 0)
46: return 0;
47:
48: do {
49: unsigned char c1 = (unsigned char) *s1++;
50: unsigned char c2 = (unsigned char) *s2++;
51:
52: if (c1 != c2) {
53: if (c1 >= 'A' && c1 <= 'Z' &&
54: c2 >= 'a' && c2 <= 'z')
55: c1 += 'a' - 'A';
56: else if (c1 >= 'a' && c1 <= 'z' &&
57: c2 >= 'A' && c2 <= 'Z')
58: c2 += 'a' - 'A';
59: if (c1 != c2)
60: return c1 - c2;
61: }
62: if (c1 == 0)
63: break;
64: } while (--n != 0);
65:
66: return 0;
67: }
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