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BZERO.C
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C/C++ Source or Header
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1984-12-31
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768b
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36 lines
/* File : bzero.c
Author : Richard A. O'Keefe.
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,
but the MOVC5 instruction will only move 65535 characters. The asm
code is presented for your interest and amusement.
*/
#include "strings.h"
#if VaxAsm
void bzero(dst, len)
char *dst;
int len;
{
asm("movc5 $0,*4(ap),$0,8(ap),*4(ap)");
}
#else ~VaxAsm
void bzero(dst, len)
register char *dst;
register int len;
{
while (--len >= 0) *dst++ = 0;
}
#endif VaxAsm