libc/string/memcpy.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <string.h> /* size_t */
  21
  22 void *memcpy (void *dst_ptr, const void *src_ptr, size_t count)
  23 {
  24         void *ret_val = dst_ptr;
  25         const char *src = (const char *)src_ptr;
  26         char *dst = (char *)dst_ptr;
  27
  28 /* copy up */
  29         for(; count != 0; count--) {
  30                 /*asm volatile (
  31                         "pushl %eax;"
  32                         "pushl %ebx;"
  33                         "pushl %ecx;"
  34                         "pushl %edx;");*/
  35                 *dst++ = *src++;
  36                 /*asm volatile (
  37                         "popl %edx;"
  38                         "popl %ecx;"
  39                         "popl %ebx;"
  40                         "popl %eax;");*/
  41         }
  42
  43         return ret_val;
  44 }