memchr.c

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    1 /*      $NetBSD: memchr.c,v 1.6 2003/08/07 16:32:09 agc Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Chris Torek.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 #if defined(LIBC_SCCS) && !defined(lint)
   37 #if 0
   38 static char sccsid[] = "@(#)memchr.c    8.1 (Berkeley) 6/4/93";
   39 #else
   40 __RCSID("$NetBSD: memchr.c,v 1.6 2003/08/07 16:32:09 agc Exp $");
   41 #endif
   42 #endif /* LIBC_SCCS and not lint */
   43 
   44 #if !defined(_KERNEL) && !defined(_STANDALONE)
   45 #include <string.h>
   46 #else
   47 #include <lib/libkern/libkern.h>
   48 #define NULL    ((char *)0)
   49 #endif
   50 
   51 void *
   52 memchr(s, c, n)
   53         const void *s;
   54         unsigned char c;
   55         size_t n;
   56 {
   57         if (n != 0) {
   58                 const unsigned char *p = s;
   59 
   60                 do {
   61                         if (*p++ == c)
   62                                 return ((void *)(p - 1));
   63                 } while (--n != 0);
   64         }
   65         return (NULL);
   66 }

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/memchr.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/memchr.c