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comparison lib/strcasecmp.c @ 265:68fbca173508 2.6

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author lost
date Tue, 22 Dec 2009 05:31:23 +0000
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264:61d1db1dfe2a 265:68fbca173508
1 /* Case-insensitive string comparison function.
2 Copyright (C) 1998-1999, 2005-2007 Free Software Foundation, Inc.
3
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)
7 any later version.
8
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.
13
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. */
17
18 #include <config.h>
19
20 /* Specification. */
21 #include <string.h>
22
23 #include <ctype.h>
24 #include <limits.h>
25
26 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
27
28 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
29 greater than zero if S1 is lexicographically less than, equal to or greater
30 than S2.
31 Note: This function does not work with multibyte strings! */
32
33 int
34 strcasecmp (const char *s1, const char *s2)
35 {
36 const unsigned char *p1 = (const unsigned char *) s1;
37 const unsigned char *p2 = (const unsigned char *) s2;
38 unsigned char c1, c2;
39
40 if (p1 == p2)
41 return 0;
42
43 do
44 {
45 c1 = TOLOWER (*p1);
46 c2 = TOLOWER (*p2);
47
48 if (c1 == '\0')
49 break;
50
51 ++p1;
52 ++p2;
53 }
54 while (c1 == c2);
55
56 if (UCHAR_MAX <= INT_MAX)
57 return c1 - c2;
58 else
59 /* On machines where 'char' and 'int' are types of the same size, the
60 difference of two 'unsigned char' values - including the sign bit -
61 doesn't fit in an 'int'. */
62 return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
63 }