mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <memcopy.h>
|
|
|
|
#undef __bzero
|
|
|
|
/* Set N bytes of S to 0. */
|
|
void
|
|
__bzero (s, len)
|
|
void *s;
|
|
size_t len;
|
|
{
|
|
long int dstp = (long int) s;
|
|
const op_t zero = 0;
|
|
|
|
if (len >= 8)
|
|
{
|
|
size_t xlen;
|
|
|
|
/* There are at least some bytes to zero. No need to test
|
|
for LEN == 0 in this alignment loop. */
|
|
while (dstp % OPSIZ != 0)
|
|
{
|
|
((byte *) dstp)[0] = 0;
|
|
dstp += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
/* Write 8 op_t per iteration until less than 8 op_t remain. */
|
|
xlen = len / (OPSIZ * 8);
|
|
while (xlen != 0)
|
|
{
|
|
((op_t *) dstp)[0] = zero;
|
|
((op_t *) dstp)[1] = zero;
|
|
((op_t *) dstp)[2] = zero;
|
|
((op_t *) dstp)[3] = zero;
|
|
((op_t *) dstp)[4] = zero;
|
|
((op_t *) dstp)[5] = zero;
|
|
((op_t *) dstp)[6] = zero;
|
|
((op_t *) dstp)[7] = zero;
|
|
dstp += 8 * OPSIZ;
|
|
xlen -= 1;
|
|
}
|
|
len %= OPSIZ * 8;
|
|
|
|
/* Write 1 op_t per iteration until less than op_t remain. */
|
|
xlen = len / OPSIZ;
|
|
while (xlen != 0)
|
|
{
|
|
((op_t *) dstp)[0] = zero;
|
|
dstp += OPSIZ;
|
|
xlen -= 1;
|
|
}
|
|
len %= OPSIZ;
|
|
}
|
|
|
|
/* Write the last few bytes. */
|
|
while (len != 0)
|
|
{
|
|
((byte *) dstp)[0] = 0;
|
|
dstp += 1;
|
|
len -= 1;
|
|
}
|
|
}
|
|
weak_alias (__bzero, bzero)
|