external/bsd/mdocml/dist/compat_strcasestr.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #ifdef HAVE_STRCASESTR
   6
   7 int dummy;
   8
   9 #else
  10
  11 /*      ($)NetBSD: strcasestr.c,v 1.2 2005/02/09 21:35:47 kleink Exp $ */
  12
  13 /*-
  14  * Copyright (c) 1990, 1993
  15  *      The Regents of the University of California.  All rights reserved.
  16  *
  17  * This code is derived from software contributed to Berkeley by
  18  * Chris Torek.
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions and the following disclaimer in the
  27  *    documentation and/or other materials provided with the distribution.
  28  * 3. Neither the name of the University nor the names of its contributors
  29  *    may be used to endorse or promote products derived from this software
  30  *    without specific prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  42  * SUCH DAMAGE.
  43  */
  44
  45 #include <sys/types.h>
  46 #include <ctype.h>
  47 #include <string.h>
  48
  49 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  50
  51 /*
  52  * Find the first occurrence of find in s, ignore case.
  53  */
  54 char *
  55 strcasestr(const char *s, const char *find)
  56 {
  57         char c, sc;
  58         size_t len;
  59
  60         if ((c = *find++) != 0) {
  61                 c = tolower((unsigned char)c);
  62                 len = strlen(find);
  63                 do {
  64                         do {
  65                                 if ((sc = *s++) == 0)
  66                                         return (NULL);
  67                         } while ((char)tolower((unsigned char)sc) != c);
  68                 } while (strncasecmp(s, find, len) != 0);
  69                 s--;
  70         }
  71         return __UNCONST(s);
  72 }
  73
  74 #endif