src/string/generic/memset_pattern.c

   1 /*
   2  * Copyright (c) 2013 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 #include <platform/string.h>
  25
  26 #if !_PLATFORM_OPTIMIZED_MEMSET_PATTERN4
  27
  28 void
  29 _platform_memset_pattern4(void *b, const void *pattern4, size_t len)
  30 {
  31         char * start = (char *)b;
  32         char * p = (char *)b;
  33         while ((start + len) - p >= 4) {
  34                 _platform_memmove(p, pattern4, 4);
  35                 p += 4;
  36         }
  37         if ((start + len) - p != 0) {
  38                 _platform_memmove(p, pattern4, (start + len) - p);
  39         }
  40 }
  41
  42 #if VARIANT_STATIC
  43 void
  44 memset_pattern4(void *b, const void *pattern4, size_t len)
  45 {
  46         return _platform_memset_pattern4(b, pattern4, len);
  47 }
  48 #endif
  49
  50 #endif
  51
  52
  53 #if !_PLATFORM_OPTIMIZED_MEMSET_PATTERN8
  54
  55 void
  56 _platform_memset_pattern8(void *b, const void *pattern8, size_t len)
  57 {
  58         char * start = (char *)b;
  59         char * p = (char *)b;
  60         while ((start + len) - p >= 8) {
  61                 _platform_memmove(p, pattern8, 8);
  62                 p += 8;
  63         }
  64         if ((start + len) - p != 0) {
  65                 _platform_memmove(p, pattern8, (start + len) - p);
  66         }
  67 }
  68
  69 #if VARIANT_STATIC
  70 void
  71 memset_pattern8(void *b, const void *pattern8, size_t len)
  72 {
  73         return _platform_memset_pattern8(b, pattern8, len);
  74 }
  75 #endif
  76
  77 #endif
  78
  79
  80 #if !_PLATFORM_OPTIMIZED_MEMSET_PATTERN16
  81
  82 void
  83 _platform_memset_pattern16(void *b, const void *pattern16, size_t len)
  84 {
  85         char * start = (char *)b;
  86         char * p = (char *)b;
  87         while ((start + len) - p >= 16) {
  88                 _platform_memmove(p, pattern16, 16);
  89                 p += 16;
  90         }
  91         if ((start + len) - p != 0) {
  92                 _platform_memmove(p, pattern16, (start + len) - p);
  93         }
  94 }
  95
  96 #if VARIANT_STATIC
  97 void
  98 memset_pattern16(void *b, const void *pattern16, size_t len)
  99 {
 100         return _platform_memset_pattern16(b, pattern16, len);
 101 }
 102 #endif
 103
 104 #endif