lib/libc/string/wcsncasecmp.c

   1 /*      $NetBSD: wcsncasecmp.c,v 1.4 2013/05/17 12:55:57 joerg Exp $    */
   2
   3 /*
   4  * Copyright (C) 2006 Aleksey Cheusov
   5  *
   6  * This material is provided "as is", with absolutely no warranty expressed
   7  * or implied. Any use is at your own risk.
   8  *
   9  * Permission to use or copy this software for any purpose is hereby granted
  10  * without fee. Permission to modify the code and to distribute modified
  11  * code is also granted without any restrictions.
  12  */
  13
  14 #include <sys/cdefs.h>
  15 #if defined(LIBC_SCCS) && !defined(lint)
  16 __RCSID("$NetBSD: wcsncasecmp.c,v 1.4 2013/05/17 12:55:57 joerg Exp $");
  17 #endif /* LIBC_SCCS and not lint */
  18
  19 #include "namespace.h"
  20 #include <assert.h>
  21 #include <wchar.h>
  22 #include <wctype.h>
  23 #include <locale.h>
  24 #include "setlocale_local.h"
  25
  26 __weak_alias(wcsncasecmp,_wcsncasecmp)
  27 __weak_alias(wcsncasecmp_l,_wcsncasecmp_l)
  28
  29 int
  30 wcsncasecmp_l(const wchar_t *s1, const wchar_t *s2, size_t n, locale_t loc)
  31 {
  32         int lc1  = 0;
  33         int lc2  = 0;
  34         int diff = 0;
  35
  36         _DIAGASSERT(s1);
  37         _DIAGASSERT(s2);
  38
  39         while (n--) {
  40                 lc1 = towlower_l(*s1, loc);
  41                 lc2 = towlower_l(*s2, loc);
  42
  43                 diff = lc1 - lc2;
  44                 if (diff)
  45                         return diff;
  46
  47                 if (!lc1)
  48                         return 0;
  49
  50                 ++s1;
  51                 ++s2;
  52         }
  53
  54         return 0;
  55 }
  56
  57 int
  58 wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  59 {
  60         return wcsncasecmp_l(s1, s2, n, _current_locale());
  61 }