src/string/generic/bzero.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 !VARIANT_STATIC
  27 // to satisfy compiler-generated memset inside libplatform (e.g. makecontext)
  28 __attribute__((visibility("hidden")))
  29 void *
  30 memset(void *b, int c, size_t len)
  31 {
  32         return _platform_memset(b, c, len);
  33 }
  34 #endif
  35
  36 #if !_PLATFORM_OPTIMIZED_MEMSET
  37
  38 void *
  39 _platform_memset(void *b, int c, size_t len) {
  40         unsigned char pattern[4];
  41
  42         pattern[0] = (unsigned char)c;
  43         pattern[1] = (unsigned char)c;
  44         pattern[2] = (unsigned char)c;
  45         pattern[3] = (unsigned char)c;
  46
  47         _platform_memset_pattern4(b, pattern, len);
  48         return b;
  49 }
  50
  51 #if VARIANT_STATIC
  52 void *
  53 memset(void *b, int c, size_t len) {
  54         return _platform_memset(b, c, len);
  55 }
  56 #endif
  57
  58 #endif
  59
  60
  61 #if !_PLATFORM_OPTIMIZED_BZERO
  62
  63 void
  64 _platform_bzero(void *s, size_t n)
  65 {
  66         _platform_memset(s, 0, n);
  67 }
  68
  69 #if VARIANT_STATIC
  70 void
  71 bzero(void *s, size_t n) {
  72         _platform_bzero(s, n);
  73 }
  74
  75 void
  76 __bzero(void *s, size_t n) {
  77         _platform_bzero(s, n);
  78 }
  79 #endif
  80
  81 #endif