usr/src/common/util/memccpy.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #ifndef _KMDB
  33 #pragma weak _memccpy = memccpy
  34
  35 #include "lint.h"
  36 #endif /* !_KMDB */
  37 #include <sys/types.h>
  38 #include <string.h>
  39 #include <stddef.h>
  40 #include <memory.h>
  41
  42 /*
  43  * Copy s0 to s, stopping if character c is copied. Copy no more than n bytes.
  44  * Return a pointer to the byte after character c in the copy,
  45  * or NULL if c is not found in the first n bytes.
  46  */
  47 void *
  48 memccpy(void *s, const void *s0, int c, size_t n)
  49 {
  50         if (n != 0) {
  51                 unsigned char *s1 = s;
  52                 const unsigned char *s2 = s0;
  53                 do {
  54                         if ((*s1++ = *s2++) == (unsigned char)c)
  55                                 return (s1);
  56                 } while (--n != 0);
  57         }
  58         return (NULL);
  59 }