string/memset_pattern.c

   1 /*
   2  * Copyright (c) 2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #include <stdio.h>
  26
  27 void
  28 bcopy(const void *src0, void *dst0, size_t length);
  29
  30 void
  31 memset_pattern4(void *b, const void *pattern4, size_t len)
  32 {
  33         char * start = (char *)b;
  34         char * p = (char *)b;
  35         while ((start + len) - p >= 4) {
  36                 bcopy(pattern4, p, 4);
  37                 p += 4;
  38         }
  39         if ((start + len) - p != 0) {
  40                 bcopy(pattern4, p, (start + len) - p);
  41         }
  42 }
  43
  44 void
  45 memset_pattern8(void *b, const void *pattern8, size_t len)
  46 {
  47         char * start = (char *)b;
  48         char * p = (char *)b;
  49         while ((start + len) - p >= 8) {
  50                 bcopy(pattern8, p, 8);
  51                 p += 8;
  52         }
  53         if ((start + len) - p != 0) {
  54                 bcopy(pattern8, p, (start + len) - p);
  55         }
  56
  57 }
  58
  59 void
  60 memset_pattern16(void *b, const void *pattern16, size_t len)
  61 {
  62         char * start = (char *)b;
  63         char * p = (char *)b;
  64         while ((start + len) - p >= 16) {
  65                 bcopy(pattern16, p, 16);
  66                 p += 16;
  67         }
  68         if ((start + len) - p != 0) {
  69                 bcopy(pattern16, p, (start + len) - p);
  70         }
  71 }