string/FreeBSD/strcasecmp.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)strcasecmp.c        8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/string/strcasecmp.c,v 1.8 2009/02/03 17:58:20 danger Exp $");
  35
  36 #include "xlocale_private.h"
  37
  38 #include <strings.h>
  39 #include <ctype.h>
  40
  41 typedef unsigned char u_char;
  42
  43 int
  44 strcasecmp_l(s1, s2, loc)
  45         const char *s1, *s2;
  46         locale_t loc;
  47 {
  48         const u_char
  49                         *us1 = (const u_char *)s1,
  50                         *us2 = (const u_char *)s2;
  51
  52         NORMALIZE_LOCALE(loc);
  53         while (tolower_l(*us1, loc) == tolower_l(*us2++, loc))
  54                 if (*us1++ == '\0')
  55                         return (0);
  56         return (tolower_l(*us1, loc) - tolower_l(*--us2, loc));
  57 }
  58
  59 int
  60 strcasecmp(const char *s1, const char *s2)
  61 {
  62         return strcasecmp_l(s1, s2, __current_locale());
  63 }
  64
  65 int
  66 strncasecmp_l(s1, s2, n, loc)
  67         const char *s1, *s2;
  68         size_t n;
  69         locale_t loc;
  70 {
  71         NORMALIZE_LOCALE(loc);
  72         if (n != 0) {
  73                 const u_char
  74                                 *us1 = (const u_char *)s1,
  75                                 *us2 = (const u_char *)s2;
  76
  77                 do {
  78                         if (tolower_l(*us1, loc) != tolower_l(*us2++, loc))
  79                                 return (tolower_l(*us1, loc) - tolower_l(*--us2, loc));
  80                         if (*us1++ == '\0')
  81                                 break;
  82                 } while (--n != 0);
  83         }
  84         return (0);
  85 }
  86
  87 int
  88 strncasecmp(const char *s1, const char *s2, size_t n)
  89 {
  90         return strncasecmp_l(s1, s2, n, __current_locale());
  91 }