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67 lines
1.1 KiB
C
67 lines
1.1 KiB
C
/* File : bzero.c
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Author : Richard A. O'Keefe.
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Michael Widenius; ifdef MC68000
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Updated: 23 April 1984
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Defines: bzero()
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bzero(dst, len) moves "len" 0 bytes to "dst".
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Thus to clear a disc buffer to 0s do bzero(buffer, BUFSIZ).
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Note: the "b" routines are there to exploit certain VAX order codes,
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The asm code is presented for your interest and amusement.
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*/
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#ifndef BSD_FUNCS
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#include "strings.h"
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#ifdef bzero
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#undef bzero /* remove macro */
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#endif
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#if VaxAsm
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static void _bzero64 _A((char *dst,int len));
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void bzero(dst, len)
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char *dst;
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uint len;
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{
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while ((int) len >= 64*K)
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{
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_bzero64(dst, 64*K-1);
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dst += 64*K-1;
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len -= 64*K-1;
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}
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_bzero64(dst, len);
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}
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_bzero64(dst, len)
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char *dst;
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int len;
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{
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asm("movc5 $0,*4(ap),$0,8(ap),*4(ap)");
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}
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#else
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#if defined(MC68000) && defined(DS90)
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void bzero(dst, len)
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char *dst;
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uint len;
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{
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bfill(dst,len,0); /* This is very optimized ! */
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} /* bzero */
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#else
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void bzero(dst, len)
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register char *dst;
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register uint len;
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{
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while (len-- != 0) *dst++ = 0;
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} /* bzero */
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#endif
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#endif
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#endif /* BSD_FUNCS */
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