mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-13 08:40:07 +00:00
67a87b936e
* sysdeps/mach/pagecopy.h: New file. * sysdeps/generic/pagecopy.h: New file. * sysdeps/generic/memcpy.c: Include pagecopy.h; call PAGE_COPY_FWD_MAYBE first when word aligned. * sysdeps/generic/memmove.c: Likewise.
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* memcpy -- copy memory to memory until the specified number of bytes
|
|
has been copied. Overlap is NOT handled correctly.
|
|
Copyright (C) 1991 Free Software Foundation, Inc.
|
|
Contributed by Torbjorn Granlund (tege@sics.se).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <string.h>
|
|
#include <memcopy.h>
|
|
#include <pagecopy.h>
|
|
|
|
PTR
|
|
DEFUN(memcpy, (dstpp, srcpp, len),
|
|
PTR dstpp AND CONST PTR srcpp AND size_t len)
|
|
{
|
|
unsigned long int dstp = (long int) dstpp;
|
|
unsigned long int srcp = (long int) srcpp;
|
|
|
|
/* Copy from the beginning to the end. */
|
|
|
|
/* If there not too few bytes to copy, use word copy. */
|
|
if (len >= OP_T_THRES)
|
|
{
|
|
/* Copy just a few bytes to make DSTP aligned. */
|
|
len -= (-dstp) % OPSIZ;
|
|
BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
|
|
|
|
/* Copy whole pages from SRCP to DSTP by virtual address manipulation,
|
|
as much as possible. */
|
|
|
|
PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len);
|
|
|
|
/* Copy from SRCP to DSTP taking advantage of the known alignment of
|
|
DSTP. Number of bytes remaining is put in the third argument,
|
|
i.e. in LEN. This number may vary from machine to machine. */
|
|
|
|
WORD_COPY_FWD (dstp, srcp, len, len);
|
|
|
|
/* Fall out and copy the tail. */
|
|
}
|
|
|
|
/* There are just a few bytes to copy. Use byte memory operations. */
|
|
BYTE_COPY_FWD (dstp, srcp, len);
|
|
|
|
return dstpp;
|
|
}
|