lib/libc/string/wcsncasecmp.c

   1 /*      $NetBSD: wcsncasecmp.c,v 1.2 2006/08/26 22:45:52 christos 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 1.2 2006/08/26 22:45:52 christos 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
  24 __weak_alias(wcsncasecmp,_wcsncasecmp)
  25
  26 int
  27 wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  28 {
  29         int lc1  = 0;
  30         int lc2  = 0;
  31         int diff = 0;
  32
  33         _DIAGASSERT(s1);
  34         _DIAGASSERT(s2);
  35
  36         while (n--) {
  37                 lc1 = towlower (*s1);
  38                 lc2 = towlower (*s2);
  39
  40                 diff = lc1 - lc2;
  41                 if (diff)
  42                         return diff;
  43
  44                 if (!lc1)
  45                         return 0;
  46
  47                 ++s1;
  48                 ++s2;
  49         }
  50
  51         return 0;
  52 }