usr/src/lib/libc/port/locale/wcscasecmp.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 (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
  25  * Copyright 2016 Joyent, Inc.
  26  */
  27
  28 /*
  29  * Compare strings ignoring case difference.
  30  *      returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
  31  * All letters are converted to the lowercase and compared.
  32  */
  33
  34 #include "lint.h"
  35 #include <stdlib.h>
  36 #include <wchar.h>
  37 #include <locale.h>
  38 #include "libc.h"
  39
  40 /* Legacy Sun interfaces */
  41 #pragma weak wscasecmp = wcscasecmp
  42 #pragma weak wsncasecmp = wcsncasecmp
  43
  44 int
  45 wcscasecmp_l(const wchar_t *s1, const wchar_t *s2, locale_t loc)
  46 {
  47         if (s1 == s2)
  48                 return (0);
  49
  50         while (towlower_l(*s1, loc) == towlower_l(*s2, loc)) {
  51                 if (*s1 == 0)
  52                         return (0);
  53                 s1++;
  54                 s2++;
  55         }
  56         return (towlower_l(*s1, loc) - towlower_l(*s2, loc));
  57 }
  58
  59 int
  60 wcscasecmp(const wchar_t *s1, const wchar_t *s2)
  61 {
  62         return (wcscasecmp_l(s1, s2, uselocale(NULL)));
  63 }
  64
  65 int
  66 wcsncasecmp_l(const wchar_t *s1, const wchar_t *s2, size_t n, locale_t loc)
  67 {
  68         if (s1 == s2 || n == 0)
  69                 return (0);
  70
  71         while ((towlower_l(*s1, loc) == towlower_l(*s2, loc)) && --n) {
  72                 if (*s1 == 0)
  73                         return (0);
  74                 s1++;
  75                 s2++;
  76         }
  77         return (towlower_l(*s1, loc) - towlower_l(*s2, loc));
  78 }
  79
  80 int
  81 wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
  82 {
  83         return (wcsncasecmp_l(s1, s2, n, uselocale(NULL)));
  84 }