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Provide memchr() in the libkern.

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This is required by libfdt and will be compiled in conditionally only for
FDT-enabled platforms.

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Rafal Jaworowski 2010-06-02 17:27:23 +00:00
parent 21d30ec18d
commit 1b1270176e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=208751
2 changed files with 52 additions and 0 deletions
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51
sys/libkern/memchr.c Normal file
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@ -0,0 +1,51 @@
/*-
* 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.
* 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>
__FBSDID("$FreeBSD$");
#include <sys/libkern.h>
#include <sys/param.h>
void *
memchr(const void *s, int c, size_t n)
{
if (n != 0) {
const unsigned char *p = s;
do {
if (*p++ == (unsigned char)c)
return ((void *)(uintptr_t)(p - 1));
} while (--n != 0);
}
return (NULL);
}

1
sys/sys/libkern.h
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@ -92,6 +92,7 @@ int flsl(long);
int fnmatch(const char *, const char *, int);
void gets(char *, size_t, int);
int locc(int, char *, u_int);
void *memchr(const void *s, int c, size_t n);
int memcmp(const void *b1, const void *b2, size_t len);
void qsort(void *base, size_t nmemb, size_t size,
int (*compar)(const void *, const void *));