Home | History | Annotate | Line # | Download | only in string
strcasestr.c revision 1.1.2.2 
      1  1.1.2.2  he /*	$NetBSD: strcasestr.c,v 1.1.2.2 2004/07/12 20:53:40 he Exp $	*/
      2  1.1.2.2  he 
      3  1.1.2.2  he /*-
      4  1.1.2.2  he  * Copyright (c) 1990, 1993
      5  1.1.2.2  he  *	The Regents of the University of California.  All rights reserved.
      6  1.1.2.2  he  *
      7  1.1.2.2  he  * This code is derived from software contributed to Berkeley by
      8  1.1.2.2  he  * Chris Torek.
      9  1.1.2.2  he  *
     10  1.1.2.2  he  * Redistribution and use in source and binary forms, with or without
     11  1.1.2.2  he  * modification, are permitted provided that the following conditions
     12  1.1.2.2  he  * are met:
     13  1.1.2.2  he  * 1. Redistributions of source code must retain the above copyright
     14  1.1.2.2  he  *    notice, this list of conditions and the following disclaimer.
     15  1.1.2.2  he  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1.2.2  he  *    notice, this list of conditions and the following disclaimer in the
     17  1.1.2.2  he  *    documentation and/or other materials provided with the distribution.
     18  1.1.2.2  he  * 3. Neither the name of the University nor the names of its contributors
     19  1.1.2.2  he  *    may be used to endorse or promote products derived from this software
     20  1.1.2.2  he  *    without specific prior written permission.
     21  1.1.2.2  he  *
     22  1.1.2.2  he  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  1.1.2.2  he  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  1.1.2.2  he  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  1.1.2.2  he  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  1.1.2.2  he  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  1.1.2.2  he  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  1.1.2.2  he  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  1.1.2.2  he  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  1.1.2.2  he  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  1.1.2.2  he  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  1.1.2.2  he  * SUCH DAMAGE.
     33  1.1.2.2  he  */
     34  1.1.2.2  he 
     35  1.1.2.2  he #include <sys/cdefs.h>
     36  1.1.2.2  he #if defined(LIBC_SCCS) && !defined(lint)
     37  1.1.2.2  he __RCSID("$NetBSD: strcasestr.c,v 1.1.2.2 2004/07/12 20:53:40 he Exp $");
     38  1.1.2.2  he #endif /* LIBC_SCCS and not lint */
     39  1.1.2.2  he 
     40  1.1.2.2  he #include <assert.h>
     41  1.1.2.2  he #include <ctype.h>
     42  1.1.2.2  he #include <string.h>
     43  1.1.2.2  he 
     44  1.1.2.2  he /*
     45  1.1.2.2  he  * Find the first occurrence of find in s, ignore case.
     46  1.1.2.2  he  */
     47  1.1.2.2  he char *
     48  1.1.2.2  he strcasestr(const char *s, const char *find)
     49  1.1.2.2  he {
     50  1.1.2.2  he 	char c, sc;
     51  1.1.2.2  he 	size_t len;
     52  1.1.2.2  he 
     53  1.1.2.2  he 	_DIAGASSERT(s != NULL);
     54  1.1.2.2  he 	_DIAGASSERT(find != NULL);
     55  1.1.2.2  he 
     56  1.1.2.2  he 	if ((c = *find++) != 0) {
     57  1.1.2.2  he 		c = tolower((unsigned char)c);
     58  1.1.2.2  he 		len = strlen(find);
     59  1.1.2.2  he 		do {
     60  1.1.2.2  he 			do {
     61  1.1.2.2  he 				if ((sc = *s++) == 0)
     62  1.1.2.2  he 					return (NULL);
     63  1.1.2.2  he 			} while ((char)tolower((unsigned char)sc) != c);
     64  1.1.2.2  he 		} while (strncasecmp(s, find, len) != 0);
     65  1.1.2.2  he 		s--;
     66  1.1.2.2  he 	}
     67  1.1.2.2  he 	/* LINTED interface specification */
     68  1.1.2.2  he 	return ((char *)s);
     69  1.1.2.2  he }
     70