lib/libc/string/strcasecmp.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#)strcasecmp.c     8.1 (Berkeley) 6/4/93
  35  * $FreeBSD: head/lib/libc/string/strcasecmp.c 251069 2013-05-28 20:57:40Z emaste $
  36  */
  37
  38 #include <strings.h>
  39 #include <ctype.h>
  40 #include "xlocale_private.h"
  41
  42 int
  43 strcasecmp_l(const char *s1, const char *s2, locale_t locale)
  44 {
  45         const u_char
  46                         *us1 = (const u_char *)s1,
  47                         *us2 = (const u_char *)s2;
  48         FIX_LOCALE(locale);
  49
  50         while (tolower_l(*us1, locale) == tolower_l(*us2++, locale))
  51                 if (*us1++ == '\0')
  52                         return (0);
  53         return (tolower_l(*us1, locale) - tolower_l(*--us2, locale));
  54 }
  55 int
  56 strcasecmp(const char *s1, const char *s2)
  57 {
  58         return strcasecmp_l(s1, s2, __get_locale());
  59 }
  60
  61 int
  62 strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t locale)
  63 {
  64         FIX_LOCALE(locale);
  65         if (n != 0) {
  66                 const u_char
  67                                 *us1 = (const u_char *)s1,
  68                                 *us2 = (const u_char *)s2;
  69
  70                 do {
  71                         if (tolower_l(*us1, locale) != tolower_l(*us2++, locale))
  72                                 return (tolower_l(*us1, locale) - tolower_l(*--us2, locale));
  73                         if (*us1++ == '\0')
  74                                 break;
  75                 } while (--n != 0);
  76         }
  77         return (0);
  78 }
  79
  80 int
  81 strncasecmp(const char *s1, const char *s2, size_t n)
  82 {
  83         return strncasecmp_l(s1, s2, n, __get_locale());
  84 }