gen/libsa/memcpy.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * more string operations
  27  *
  28  */
  29
  30 #import "libsa.h"
  31
  32 #if defined(NX_CURRENT_COMPILER_RELEASE) && (NX_CURRENT_COMPILER_RELEASE < 320)
  33 #define SIREG "e"
  34 #else
  35 #define SIREG "S"
  36 #endif
  37
  38 #if i386 && !defined(DONT_USE_ASM)
  39 /* Simple forward character copy */
  40 void *memcpy(void *dst, const void *src, size_t len)
  41 {
  42     asm("rep; movsb"
  43         : /* no outputs */
  44         : "&c" (len), "D" (dst), SIREG (src)
  45         : "ecx", "esi", "edi");
  46     return (void *)src;
  47 }
  48 #else
  49 void *memcpy(
  50     void *dst,
  51     const void *src,
  52     size_t len
  53 )
  54 {
  55         register char *src_c, *dst_c;
  56
  57         src_c = (char *)src;
  58         dst_c = (char *)dst;
  59
  60         while (len-- > 0)
  61                 *dst_c++ = *src_c++;
  62         return src;
  63 }
  64 #endif
  65
  66 /*
  67  * copy n bytes from src to dst. Both src and dst are virtual addresses.
  68  */
  69 char *bcopy(char *src, char *dst, int n)
  70 {
  71         memcpy(dst, src, n);
  72         return 0;
  73 }
  74
  75