2 * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <sys/types.h>
22 __unused static const char rcsid[] = "$Sudo: strcasecmp.c,v 1.3.4.2 2007/06/12 16:19:15 millert Exp $";
26 * Case insensitive string compare routines, same semantics as str[n]cmp()
28 * Derived from a public domain implementation included with the pdksh shell.
30 static const char ichars[256] = {
31 0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
32 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
33 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
34 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
35 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
36 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
37 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
38 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
39 0x40, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
40 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
41 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
42 'x', 'y', 'z', 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
43 0x60, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
44 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
45 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
46 'x', 'y', 'z', 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
47 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
48 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
49 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
50 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
51 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
52 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
53 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
54 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
55 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
56 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
57 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
58 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
59 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
60 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
61 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
62 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
70 const unsigned char *us1 = (const unsigned char *) s1;
71 const unsigned char *us2 = (const unsigned char *) s2;
73 while (ichars[*us1] == ichars[*us2++]) {
77 return ichars[*us1] - ichars[*--us2];
81 strncasecmp(s1, s2, n)
86 const unsigned char *us1 = (const unsigned char *) s1;
87 const unsigned char *us2 = (const unsigned char *) s2;
89 while (n != 0 && ichars[*us1] == ichars[*us2++]) {
94 return n ? ichars[*us1] - ichars[*--us2] : 0;