mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 04:22:27 +01:00
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/* Copyright (C) 2000 MySQL AB
|
|
|
|
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; version 2 of the License.
|
|
|
|
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 */
|
|
|
|
/* File : bzero.c
|
|
Author : Richard A. O'Keefe.
|
|
Michael Widenius; ifdef MC68000
|
|
Updated: 23 April 1984
|
|
Defines: bzero()
|
|
|
|
bzero(dst, len) moves "len" 0 bytes to "dst".
|
|
Thus to clear a disc buffer to 0s do bzero(buffer, BUFSIZ).
|
|
|
|
Note: the "b" routines are there to exploit certain VAX order codes,
|
|
The asm code is presented for your interest and amusement.
|
|
*/
|
|
|
|
#ifndef BSD_FUNCS
|
|
#include "strings.h"
|
|
|
|
#ifdef bzero
|
|
#undef bzero /* remove macro */
|
|
#endif
|
|
|
|
#if VaxAsm
|
|
|
|
static void _bzero64 _A((char *dst,int len));
|
|
|
|
void bzero(dst, len)
|
|
char *dst;
|
|
uint len;
|
|
{
|
|
while ((int) len >= 64*K)
|
|
{
|
|
_bzero64(dst, 64*K-1);
|
|
dst += 64*K-1;
|
|
len -= 64*K-1;
|
|
}
|
|
_bzero64(dst, len);
|
|
}
|
|
|
|
_bzero64(dst, len)
|
|
char *dst;
|
|
int len;
|
|
{
|
|
asm("movc5 $0,*4(ap),$0,8(ap),*4(ap)");
|
|
}
|
|
|
|
#else
|
|
|
|
#if defined(MC68000) && defined(DS90)
|
|
|
|
void bzero(dst, len)
|
|
char *dst;
|
|
uint len;
|
|
{
|
|
bfill(dst,len,0); /* This is very optimized ! */
|
|
} /* bzero */
|
|
|
|
#else
|
|
|
|
void bzero(dst, len)
|
|
register char *dst;
|
|
register uint len;
|
|
{
|
|
while (len-- != 0) *dst++ = 0;
|
|
} /* bzero */
|
|
|
|
#endif
|
|
#endif
|
|
#endif /* BSD_FUNCS */
|