1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25 
  26 /*
  27  * Compare strings ignoring case difference.
  28  *      returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
  29  * All letters are converted to the lowercase and compared.
  30  */
  31 
  32 #pragma weak _wsncasecmp = wsncasecmp
  33 
  34 #include "lint.h"
  35 #include <stdlib.h>
  36 #include <widec.h>
  37 #include "libc.h"
  38 
  39 int
  40 wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  41 {
  42         if (s1 == s2)
  43                 return (0);
  44 
  45         n++;
  46         while (--n > 0 && towlower(*s1) == towlower(*s2++))
  47                 if (*s1++ == 0)
  48                         return (0);
  49         return ((n == 0) ? 0 : (towlower(*s1) - towlower(*(s2 - 1))));
  50 }
  51 
  52 int
  53 wsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  54 {
  55         return (wcsncasecmp(s1, s2, n));
  56 }