memcpy.c
上传用户:tany51
上传日期:2013-06-12
资源大小:1397k
文件大小:2k
- /*
- * Copyright (C) 2000 Ross Combs (rocombs@cs.nmsu.edu)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- #include "common/setup_before.h"
- #ifndef HAVE_MEMCPY
- #ifdef HAVE_STDDEF_H
- # include <stddef.h>
- #else
- # ifndef NULL
- # define NULL ((void *)0)
- # endif
- #endif
- #ifdef HAVE_BCOPY
- # ifdef HAVE_STRING_H
- # include <string.h>
- # endif
- # ifdef HAVE_MEMORY_H
- # include <memory.h>
- # endif
- #endif
- #include "memcpy.h"
- #include "common/setup_after.h"
- extern void * memcpy(void * dest, void const * src, unsigned long n)
- {
- #ifdef HAVE_BCOPY
- bcopy(src,dest,n);
- return dest;
- #else
- /* very slow, but we don't care */
- unsigned char * td=dest;
- unsigned char * ts=src;
- unsigned long i;
-
- if (!td || !ts)
- return NULL;
-
- for (i=0; i<n; i++)
- td[i] = ts[i];
- return dest;
- #endif
- }
- #else
- typedef int filenotempty; /* make ISO standard happy */
- #endif