1 /* Case-insensitive string comparison functions in C locale.
2 Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2023 Free Software
3 Foundation, Inc.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #ifndef C_STRCASE_H
19 #define C_STRCASE_H
20
21 /* This file uses _GL_ATTRIBUTE_PURE. */
22 #if !_GL_CONFIG_H_INCLUDED
23 #error "Please include config.h first."
24 #endif
25
26 #include <stddef.h>
27
28
29 /* The functions defined in this file assume the "C" locale and a character
30 set without diacritics (ASCII-US or EBCDIC-US or something like that).
31 Even if the "C" locale on a particular system is an extension of the ASCII
32 character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
33 is ISO-8859-1), the functions in this file recognize only the ASCII
34 characters. More precisely, one of the string arguments must be an ASCII
35 string; the other one can also contain non-ASCII characters (but then
36 the comparison result will be nonzero). */
37
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43
44 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
45 greater than zero if S1 is lexicographically less than, equal to or greater
46 than S2. */
47 extern int c_strcasecmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
48
49 /* Compare no more than N characters of strings S1 and S2, ignoring case,
50 returning less than, equal to or greater than zero if S1 is
51 lexicographically less than, equal to or greater than S2. */
52 extern int c_strncasecmp (const char *s1, const char *s2, size_t n)
53 _GL_ATTRIBUTE_PURE;
54
55
56 #ifdef __cplusplus
57 }
58 #endif
59
60
61 #endif /* C_STRCASE_H */