1/* Copyright (C) 1991-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <wctype.h>
23#include <wchar.h>
24
25#ifndef weak_alias
26# define __wcscasecmp wcscasecmp
27# define TOLOWER(Ch) towlower (Ch)
28#else
29# ifdef USE_IN_EXTENDED_LOCALE_MODEL
30# define __wcscasecmp __wcscasecmp_l
31# define TOLOWER(Ch) __towlower_l ((Ch), loc)
32# else
33# define TOLOWER(Ch) towlower (Ch)
34# endif
35#endif
36
37#ifdef USE_IN_EXTENDED_LOCALE_MODEL
38# define LOCALE_PARAM , locale_t loc
39#else
40# define LOCALE_PARAM
41#endif
42
43/* Compare S1 and S2, ignoring case, returning less than, equal to or
44 greater than zero if S1 is lexicographically less than,
45 equal to or greater than S2. */
46int
47__wcscasecmp (const wchar_t *s1, const wchar_t *s2 LOCALE_PARAM)
48{
49 wint_t c1, c2;
50
51 if (s1 == s2)
52 return 0;
53
54 do
55 {
56 c1 = TOLOWER (*s1++);
57 c2 = TOLOWER (*s2++);
58 if (c1 == L'\0')
59 break;
60 }
61 while (c1 == c2);
62
63 return c1 - c2;
64}
65#ifndef __wcscasecmp
66weak_alias (__wcscasecmp, wcscasecmp)
67#endif
68