usr/src/lib/libc/port/i18n/wscasecmp.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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Compare strings ignoring case difference.
  31  *      returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
  32  * All letters are converted to the lowercase and compared.
  33  */
  34
  35 #pragma weak _wscasecmp = wscasecmp
  36
  37 #include "lint.h"
  38 #include <stdlib.h>
  39 #include <widec.h>
  40 #include "libc.h"
  41
  42 int
  43 wscasecmp(const wchar_t *s1, const wchar_t *s2)
  44 {
  45         if (s1 == s2)
  46                 return (0);
  47
  48         while (towlower(*s1) == towlower(*s2++))
  49                 if (*s1++ == 0)
  50                         return (0);
  51         return (towlower(*s1) - towlower(*(s2 - 1)));
  52 }