usr/src/lib/libc/port/i18n/wsncmp.c

   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 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1986 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * Compare strings (at most n characters)
  34  *      returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
  35  */
  36
  37 #pragma weak _wcsncmp = wcsncmp
  38 #pragma weak _wsncmp = wsncmp
  39
  40 #include "lint.h"
  41 #include <stdlib.h>
  42 #include <wchar.h>
  43
  44 int
  45 wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  46 {
  47         if (s1 == s2)
  48                 return (0);
  49
  50         n++;
  51         while (--n > 0 && *s1 == *s2++)
  52                 if (*s1++ == 0)
  53                         return (0);
  54         return ((n == 0) ? 0 : (*s1 - *(s2 - 1)));
  55 }
  56
  57 int
  58 wsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  59 {
  60         return (wcsncmp(s1, s2, n));
  61 }