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Modify strnstr.c.

This commit is contained in:
Sichen Zhao 2017-08-30 11:03:56 +08:00 committed by Corinna Vinschen
parent cdbec10e79
commit f22054c94d
1 changed files with 10 additions and 55 deletions
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65
newlib/libc/string/strnstr.c
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@ -1,42 +1,5 @@
/*- #undef __STRICT_ANSI__
* Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org> #include <_ansi.h>
* 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. 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strstr.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/lib/libc/string/strnstr.c 251069 2013-05-28 20:57:40Z emaste $");
#include <string.h> #include <string.h>
/* /*
@ -44,22 +7,14 @@ __FBSDID("$FreeBSD: head/lib/libc/string/strnstr.c 251069 2013-05-28 20:57:40Z e
* first slen characters of s. * first slen characters of s.
*/ */
char * char *
strnstr(const char *s, const char *find, size_t slen) strnstr(const char *haystack, const char *needle, size_t haystack_len)
{ {
char c, sc; size_t needle_len = strnlen(needle, haystack_len);
size_t len;
if ((c = *find++) != '\0') { if (needle_len < haystack_len || !needle[needle_len]) {
len = strlen(find); char *x = memmem(haystack, haystack_len, needle, needle_len);
do { if (x && !memchr(haystack, 0, x - haystack))
do { return x;
if (slen-- < 1 || (sc = *s++) == '\0') }
return (NULL); return NULL;
} while (sc != c);
if (len > slen)
return (NULL);
} while (strncmp(s, find, len) != 0);
s--;
}
return ((char *)s);
} }