external/ibm-public/postfix/dist/src/util/strcasecmp.c

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