compat_strcasestr.c

   1 #include "config.h"
   2
   3 #if HAVE_STRCASESTR
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      ($)NetBSD: strcasestr.c,v 1.2 2005/02/09 21:35:47 kleink Exp $ */
  10
  11 /*-
  12  * Copyright (c) 1990, 1993
  13  *      The Regents of the University of California.  All rights reserved.
  14  *
  15  * This code is derived from software contributed to Berkeley by
  16  * Chris Torek.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  * 3. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  */
  42
  43 #include <sys/types.h>
  44 #include <ctype.h>
  45 #include <string.h>
  46
  47 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  48
  49 /*
  50  * Find the first occurrence of find in s, ignore case.
  51  */
  52 char *
  53 strcasestr(const char *s, const char *find)
  54 {
  55         char c, sc;
  56         size_t len;
  57
  58         if ((c = *find++) != 0) {
  59                 c = tolower((unsigned char)c);
  60                 len = strlen(find);
  61                 do {
  62                         do {
  63                                 if ((sc = *s++) == 0)
  64                                         return (NULL);
  65                         } while ((char)tolower((unsigned char)sc) != c);
  66                 } while (strncasecmp(s, find, len) != 0);
  67                 s--;
  68         }
  69         return __UNCONST(s);
  70 }
  71
  72 #endif