freebsd-dev/lib/libc/string/strnstr.c
Mike Barcroft 41036d782d Add a new libc function, strnstr(3), which allows one to limit the
number of characters that are searched.  This is especially useful
with file operations and non-NUL terminated strings.

Silence from:	-audit, -hackers
MFC after:	5 days
2001-10-09 01:29:56 +00:00

71 lines
2.5 KiB
C

/*-
* Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("@(#)strstr.c 8.1 (Berkeley) 6/4/93");
__FBSDID("$FreeBSD$");
#include <string.h>
/*
* Find the first occurrence of find in s, where the search is limited to the
* first slen characters of s.
*/
char *
strnstr(s, find, slen)
const char *s;
const char *find;
size_t slen;
{
char c, sc;
size_t len;
if ((c = *find++) != '\0') {
len = strlen(find);
do {
do {
if ((sc = *s++) == '\0' || slen-- < 1)
return (NULL);
} while (sc != c);
if (len > slen)
return (NULL);
} while (strncmp(s, find, len) != 0);
s--;
}
return ((char *)s);
}