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24d56127 | 1 | /* c-strncasecmp.c -- case insensitive string comparator in C locale |
5e69ceb7 | 2 | Copyright (C) 1998-1999, 2005-2006, 2009-2014 Free Software Foundation, Inc. |
24d56127 LC |
3 | |
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU Lesser 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 Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public License | |
005de2e8 | 15 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
24d56127 LC |
16 | |
17 | #include <config.h> | |
18 | ||
19 | /* Specification. */ | |
20 | #include "c-strcase.h" | |
21 | ||
22 | #include <limits.h> | |
23 | ||
24 | #include "c-ctype.h" | |
25 | ||
26 | int | |
27 | c_strncasecmp (const char *s1, const char *s2, size_t n) | |
28 | { | |
29 | register const unsigned char *p1 = (const unsigned char *) s1; | |
30 | register const unsigned char *p2 = (const unsigned char *) s2; | |
31 | unsigned char c1, c2; | |
32 | ||
33 | if (p1 == p2 || n == 0) | |
34 | return 0; | |
35 | ||
36 | do | |
37 | { | |
38 | c1 = c_tolower (*p1); | |
39 | c2 = c_tolower (*p2); | |
40 | ||
41 | if (--n == 0 || c1 == '\0') | |
1cd4fffc | 42 | break; |
24d56127 LC |
43 | |
44 | ++p1; | |
45 | ++p2; | |
46 | } | |
47 | while (c1 == c2); | |
48 | ||
49 | if (UCHAR_MAX <= INT_MAX) | |
50 | return c1 - c2; | |
51 | else | |
52 | /* On machines where 'char' and 'int' are types of the same size, the | |
53 | difference of two 'unsigned char' values - including the sign bit - | |
54 | doesn't fit in an 'int'. */ | |
55 | return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); | |
56 | } |