gen/libsa/memcpy.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * more string operations
  26  *
  27  */
  28
  29 #import "libsa.h"
  30
  31 #if defined(NX_CURRENT_COMPILER_RELEASE) && (NX_CURRENT_COMPILER_RELEASE < 320)
  32 #define SIREG "e"
  33 #else
  34 #define SIREG "S"
  35 #endif
  36
  37 #if i386 && !defined(DONT_USE_ASM)
  38 /* Simple forward character copy */
  39 void *memcpy(void *dst, const void *src, size_t len)
  40 {
  41     asm("rep; movsb"
  42         : /* no outputs */
  43         : "&c" (len), "D" (dst), SIREG (src)
  44         : "ecx", "esi", "edi");
  45     return (void *)src;
  46 }
  47 #else
  48 void *memcpy(
  49     void *dst,
  50     const void *src,
  51     size_t len
  52 )
  53 {
  54         register char *src_c, *dst_c;
  55
  56         src_c = (char *)src;
  57         dst_c = (char *)dst;
  58
  59         while (len-- > 0)
  60                 *dst_c++ = *src_c++;
  61         return src;
  62 }
  63 #endif
  64
  65 /*
  66  * copy n bytes from src to dst. Both src and dst are virtual addresses.
  67  */
  68 char *bcopy(char *src, char *dst, int n)
  69 {
  70         memcpy(dst, src, n);
  71         return 0;
  72 }
  73
  74