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[glibc/history.git] / wcsmbs / wcsncase.c
blob5056e9c1cb5434ec352c2c17f4fe2e2ba5f4116d
1 /* Compare at most N wide characters of two strings without taking care
2 for the case.
3 Copyright (C) 1992, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
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.
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
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #ifdef HAVE_CONFIG_H
22 # include <config.h>
23 #endif
25 #include <wchar.h>
26 #include <wctype.h>
28 #ifndef weak_alias
29 # define __wcsncasecmp wcsncasecmp
30 # define TOLOWER(Ch) towlower (Ch)
31 #else
32 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
33 # define __wcsncasecmp __wcsncasecmp_l
34 # define TOLOWER(Ch) __towlower_l ((Ch), loc)
35 # else
36 # define TOLOWER(Ch) towlower (Ch)
37 # endif
38 #endif
40 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
41 # define LOCALE_PARAM , loc
42 # define LOCALE_PARAM_DECL __locale_t loc;
43 #else
44 # define LOCALE_PARAM
45 # define LOCALE_PARAM_DECL
46 #endif
48 /* Compare no more than N wide characters of S1 and S2,
49 ignoring case, returning less than, equal to or
50 greater than zero if S1 is lexicographically less
51 than, equal to or greater than S2. */
52 int
53 __wcsncasecmp (s1, s2, n LOCALE_PARAM)
54 const wchar_t *s1;
55 const wchar_t *s2;
56 size_t n;
57 LOCALE_PARAM_DECL
59 wint_t c1, c2;
61 if (s1 == s2 || n == 0)
62 return 0;
66 c1 = (wint_t) TOLOWER (*s1++);
67 c2 = (wint_t) TOLOWER (*s2++);
68 if (c1 == L'\0' || c1 != c2)
69 return c1 - c2;
70 } while (--n > 0);
72 return c1 - c2;
74 #ifndef __wcsncasecmp
75 weak_alias (__wcsncasecmp, wcsncasecmp)
76 #endif