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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/* Copyright (C) 1991 Free Software Foundation, Inc.
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Contributed by Torbjorn Granlund (tege@sics.se).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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#include <memcopy.h>
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/* Set N bytes of S to 0. */
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void
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DEFUN(bzero, (s, n), PTR s AND size_t len)
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{
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long int dstp = (long int) s;
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CONST op_t zero = 0;
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if (len >= 8)
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{
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size_t xlen;
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/* There are at least some bytes to zero. No need to test
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for LEN == 0 in this alignment loop. */
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while (dstp % OPSIZ != 0)
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{
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((byte *) dstp)[0] = 0;
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dstp += 1;
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len -= 1;
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}
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/* Write 8 op_t per iteration until less than 8 op_t remain. */
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xlen = len / (OPSIZ * 8);
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while (xlen != 0)
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{
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((op_t *) dstp)[0] = zero;
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((op_t *) dstp)[1] = zero;
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((op_t *) dstp)[2] = zero;
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((op_t *) dstp)[3] = zero;
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((op_t *) dstp)[4] = zero;
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((op_t *) dstp)[5] = zero;
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((op_t *) dstp)[6] = zero;
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((op_t *) dstp)[7] = zero;
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dstp += 8 * OPSIZ;
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xlen -= 1;
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}
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len %= OPSIZ * 8;
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/* Write 1 op_t per iteration until less than op_t remain. */
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xlen = len / OPSIZ;
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while (xlen != 0)
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{
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((op_t *) dstp)[0] = zero;
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dstp += OPSIZ;
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xlen -= 1;
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}
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len %= OPSIZ;
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}
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/* Write the last few bytes. */
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while (len != 0)
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{
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((byte *) dstp)[0] = 0;
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dstp += 1;
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len -= 1;
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}
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}
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