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author | raj <raj@FreeBSD.org> | 2010-06-02 17:27:23 +0000 |
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committer | raj <raj@FreeBSD.org> | 2010-06-02 17:27:23 +0000 |
commit | 6840cdea0c707d950ac0a2eb39fba080bfbaaebf (patch) | |
tree | 22c1dfabbb49c030ec83dd0cf00ccee6a35e1c10 /sys/libkern/memchr.c | |
parent | 425b04623b930a86b902765da5190dabff5ff8ba (diff) | |
download | FreeBSD-src-6840cdea0c707d950ac0a2eb39fba080bfbaaebf.zip FreeBSD-src-6840cdea0c707d950ac0a2eb39fba080bfbaaebf.tar.gz |
Provide memchr() in the libkern.
This is required by libfdt and will be compiled in conditionally only for
FDT-enabled platforms.
Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'sys/libkern/memchr.c')
-rw-r--r-- | sys/libkern/memchr.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/sys/libkern/memchr.c b/sys/libkern/memchr.c new file mode 100644 index 0000000..a00ea6d --- /dev/null +++ b/sys/libkern/memchr.c @@ -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); +} |