1 /*-

     2  * Copyright (c) 1990, 1993

     3  *	The Regents of the University of California.  All rights reserved.

     4  *

     5  * This code is derived from software contributed to Berkeley by

     6  * Chris Torek.

     7  *

     8  * Redistribution and use in source and binary forms, with or without

     9  * modification, are permitted provided that the following conditions

    10  * are met:

    11  * 1. Redistributions of source code must retain the above copyright

    12  *    notice, this list of conditions and the following disclaimer.

    13  * 2. Redistributions in binary form must reproduce the above copyright

    14  *    notice, this list of conditions and the following disclaimer in the

    15  *    documentation and/or other materials provided with the distribution.

    16  * 4. Neither the name of the University nor the names of its contributors

    17  *    may be used to endorse or promote products derived from this software

    18  *    without specific prior written permission.

    19  *

    20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

    21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

    24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    30  * SUCH DAMAGE.

    31  * © Portions copyright (c) 2005-2006  Nokia Corporation.  All rights reserved.

    32  */

    33 

    34 #include <sys/cdefs.h>

    35 #ifndef __SYMBIAN32__

    36 __FBSDID("$FreeBSD: src/lib/libc/string/strcasestr.c,v 1.3 2002/03/21 18:44:54 obrien Exp $");

    37 #endif

    38 

    39 

    40 #include <ctype.h>

    41 #include <string.h>

    42 

    43 /*

    44  * Find the first occurrence of find in s, ignore case.

    45  */

    46 EXPORT_C 

    47 char *

    48 strcasestr(const char *s, const char *find)

    49 	

    50 {

    51 	char c, sc;

    52 	size_t len;

    53 

    54 	if ((c = *find++) != 0) {

    55 		c = tolower((unsigned char)c);

    56 		len = strlen(find);

    57 		do {

    58 			do {

    59 				if ((sc = *s++) == 0)

    60 					return (NULL);

    61 			} while ((char)tolower((unsigned char)sc) != c);

    62 		} while (strncasecmp(s, find, len) != 0);

    63 		s--;

    64 	}

    65 	return ((char *)s);

    66 }