compat_strcasestr.c

   1 #include "config.h"
   2
   3 #if HAVE_STRCASESTR
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      $Id: compat_strcasestr.c,v 1.4 2014/12/11 09:19:32 schwarze Exp $       */
  10 /*      $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $  */
  11
  12 /*-
  13  * Copyright (c) 1990, 1993
  14  *      The Regents of the University of California.  All rights reserved.
  15  *
  16  * This code is derived from software contributed to Berkeley by
  17  * Chris Torek.
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in the
  26  *    documentation and/or other materials provided with the distribution.
  27  * 3. Neither the name of the University nor the names of its contributors
  28  *    may be used to endorse or promote products derived from this software
  29  *    without specific prior written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  41  * SUCH DAMAGE.
  42  */
  43
  44 #include <sys/types.h>
  45 #include <ctype.h>
  46 #include <string.h>
  47
  48 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  49
  50 /*
  51  * Find the first occurrence of find in s, ignore case.
  52  */
  53 char *
  54 strcasestr(const char *s, const char *find)
  55 {
  56         char c, sc;
  57         size_t len;
  58
  59         if ((c = *find++) != 0) {
  60                 c = tolower((unsigned char)c);
  61                 len = strlen(find);
  62                 do {
  63                         do {
  64                                 if ((sc = *s++) == 0)
  65                                         return (NULL);
  66                         } while ((char)tolower((unsigned char)sc) != c);
  67                 } while (strncasecmp(s, find, len) != 0);
  68                 s--;
  69         }
  70         return __UNCONST(s);
  71 }
  72
  73 #endif