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memccpy.c revision 1.3 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
     34  * --------------------         -----   ----------------------
     35  * CURRENT PATCH LEVEL:         1       00109
     36  * --------------------         -----   ----------------------
     37  *
     38  * 01 Mar 93    Tor Egge		Fix bogus return value from memccpy()
     39  *
     40  */
     41 
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 /*static char sccsid[] = "from: @(#)memccpy.c	5.8 (Berkeley) 5/30/91";*/
     44 static char rcsid[] = "$Id: memccpy.c,v 1.3 1993/08/01 18:36:34 mycroft Exp $";
     45 #endif /* LIBC_SCCS and not lint */
     46 
     47 #include <sys/cdefs.h>
     48 #include <string.h>
     49 
     50 void *
     51 memccpy(t, f, c, n)
     52 	void *t;
     53 	const void *f;
     54 	int c;
     55 	register size_t n;
     56 {
     57 
     58 	if (n) {
     59 		register unsigned char *tp = t;
     60 		register const unsigned char *fp = f;
     61 		register unsigned char uc = c;
     62 		do {
     63 			if ((*tp++ = *fp++) == uc)
     64 				return (tp);
     65 		} while (--n != 0);
     66 	}
     67 	return (0);
     68 }
     69