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c84142e8 UD |
1 | /* Compare at most N characters of two strings without taking care for |
2 | the case. | |
688903eb | 3 | Copyright (C) 1992-2018 Free Software Foundation, Inc. |
c84142e8 UD |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
c84142e8 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
c84142e8 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 19 | |
0501d603 UD |
20 | #ifdef HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
23 | ||
28f540f4 RM |
24 | #include <string.h> |
25 | #include <ctype.h> | |
26 | ||
c84142e8 UD |
27 | #ifndef weak_alias |
28 | # define __strncasecmp strncasecmp | |
0501d603 UD |
29 | # define TOLOWER(Ch) tolower (Ch) |
30 | #else | |
3bc9b83f | 31 | # include <locale/localeinfo.h> |
0501d603 UD |
32 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL |
33 | # define __strncasecmp __strncasecmp_l | |
0501d603 | 34 | # endif |
3bc9b83f | 35 | # define TOLOWER(Ch) __tolower_l ((Ch), loc) |
0501d603 UD |
36 | #endif |
37 | ||
38 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL | |
af85385f | 39 | # define LOCALE_PARAM , locale_t loc |
0501d603 UD |
40 | #else |
41 | # define LOCALE_PARAM | |
c84142e8 UD |
42 | #endif |
43 | ||
28f540f4 RM |
44 | /* Compare no more than N characters of S1 and S2, |
45 | ignoring case, returning less than, equal to or | |
46 | greater than zero if S1 is lexicographically less | |
47 | than, equal to or greater than S2. */ | |
48 | int | |
80d9be81 | 49 | __strncasecmp (const char *s1, const char *s2, size_t n LOCALE_PARAM) |
28f540f4 | 50 | { |
3bc9b83f | 51 | #if defined _LIBC && !defined USE_IN_EXTENDED_LOCALE_MODEL |
af85385f | 52 | locale_t loc = _NL_CURRENT_LOCALE; |
3bc9b83f | 53 | #endif |
c84142e8 UD |
54 | const unsigned char *p1 = (const unsigned char *) s1; |
55 | const unsigned char *p2 = (const unsigned char *) s2; | |
f5e6e2ee | 56 | int result; |
28f540f4 RM |
57 | |
58 | if (p1 == p2 || n == 0) | |
59 | return 0; | |
60 | ||
f5e6e2ee UD |
61 | while ((result = TOLOWER (*p1) - TOLOWER (*p2++)) == 0) |
62 | if (*p1++ == '\0' || --n == 0) | |
63 | break; | |
28f540f4 | 64 | |
f5e6e2ee | 65 | return result; |
28f540f4 | 66 | } |
0501d603 | 67 | #ifndef __strncasecmp |
bba7bb78 | 68 | weak_alias (__strncasecmp, strncasecmp) |
c84142e8 | 69 | #endif |