string/strcasecmp-fbsd.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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)strcasecmp.c        8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/string/strcasecmp.c,v 1.6 2002/08/30 15:40:01 robert Exp $");
  39
  40 #include "xlocale_private.h"
  41
  42 #include <strings.h>
  43 #include <ctype.h>
  44
  45 typedef unsigned char u_char;
  46
  47 int
  48 strcasecmp_l(s1, s2, loc)
  49         const char *s1, *s2;
  50         locale_t loc;
  51 {
  52         const u_char
  53                         *us1 = (const u_char *)s1,
  54                         *us2 = (const u_char *)s2;
  55
  56         NORMALIZE_LOCALE(loc);
  57         while (tolower_l(*us1, loc) == tolower_l(*us2++, loc))
  58                 if (*us1++ == '\0')
  59                         return (0);
  60         return (tolower_l(*us1, loc) - tolower_l(*--us2, loc));
  61 }
  62
  63 int
  64 strcasecmp(s1, s2)
  65         const char *s1, *s2;
  66 {
  67         return strcasecmp_l(s1, s2, __current_locale());
  68 }
  69
  70 int
  71 strncasecmp_l(s1, s2, n, loc)
  72         const char *s1, *s2;
  73         size_t n;
  74         locale_t loc;
  75 {
  76         NORMALIZE_LOCALE(loc);
  77         if (n != 0) {
  78                 const u_char
  79                                 *us1 = (const u_char *)s1,
  80                                 *us2 = (const u_char *)s2;
  81
  82                 do {
  83                         if (tolower_l(*us1, loc) != tolower_l(*us2++, loc))
  84                                 return (tolower_l(*us1, loc) - tolower_l(*--us2, loc));
  85                         if (*us1++ == '\0')
  86                                 break;
  87                 } while (--n != 0);
  88         }
  89         return (0);
  90 }
  91
  92 int
  93 strncasecmp(s1, s2, n)
  94         const char *s1, *s2;
  95         size_t n;
  96 {
  97         return strncasecmp_l(s1, s2, n, __current_locale());
  98 }