41 lines
772 B
C
41 lines
772 B
C
/* $NetBSD: tsftomsu.c,v 1.2 2003/12/04 16:23:37 drochner Exp $ */
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/*
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* tsftomsu - convert from a time stamp fraction to milliseconds
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*/
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#include "ntp_fp.h"
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#include "ntp_stdlib.h"
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int
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tsftomsu(
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u_long tsf,
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int round
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)
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{
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register long val_ui, val_uf;
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register long tmp_ui, tmp_uf;
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register int i;
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/*
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* Essentially, multiply by 10 three times in l_fp form.
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* The integral part is the milliseconds.
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*/
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val_ui = 0;
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val_uf = tsf;
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for (i = 3; i > 0; i--) {
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M_LSHIFT(val_ui, val_uf);
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tmp_ui = val_ui;
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tmp_uf = val_uf;
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M_LSHIFT(val_ui, val_uf);
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M_LSHIFT(val_ui, val_uf);
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M_ADD(val_ui, val_uf, tmp_ui, tmp_uf);
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}
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/*
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* Round the value if need be, then return it.
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*/
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if (round && (val_uf & 0x80000000))
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val_ui++;
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return (int)val_ui;
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}
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