gen/libsa/string2.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
  33 #if i386 && !defined(DONT_USE_ASM)
  34 void *memset(void *dst, int val, size_t len)
  35 {
  36     asm("rep; stosb"
  37         : /* no outputs */
  38         : "&c" (len), "D" (dst), "a" (val)
  39         : "ecx", "esi", "eax");
  40     return dst;
  41 }
  42 /* Simple forward character copy */
  43 void *memcpy(void *dst, const void *src, size_t len)
  44 {
  45     asm("rep; movsb"
  46         : /* no outputs */
  47         : "&c" (len), "D" (dst), "e" (src)
  48         : "ecx", "esi", "edi");
  49     return src;
  50 }
  51 #else
  52 void *memset(void *p, int val, size_t len)
  53 {
  54         register char *ptr = (char *)p;
  55         while (len-- > 0) *ptr++ = val;
  56         return p;
  57 }
  58
  59 void *memcpy(
  60     void *dst,
  61     const void *src,
  62     size_t len
  63 )
  64 {
  65         register char *src_c, *dst_c;
  66
  67         src_c = (char *)src;
  68         dst_c = (char *)dst;
  69
  70         while (len-- > 0)
  71                 *dst_c++ = *src_c++;
  72         return src;
  73 }
  74 #endif
  75