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Better check for rollover.

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This commit is contained in:
William McBrine
2007-01-01 21:04:27 +00:00
parent 314585a105
commit 72b61c1b0e
1 changed files with 9 additions and 4 deletions
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13
dos/pdcutil.c
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@@ -19,7 +19,7 @@
#include <time.h>
RCSID("$Id: pdcutil.c,v 1.18 2007/01/01 20:40:24 wmcbrine Exp $");
RCSID("$Id: pdcutil.c,v 1.19 2007/01/01 21:04:27 wmcbrine Exp $");
void PDC_beep(void)
{
@@ -43,7 +43,7 @@ void PDC_beep(void)
void PDC_napms(int ms)
{
PDCREGS regs;
PDCCLOCK_T goal;
PDCCLOCK_T goal, start, current;
PDC_LOG(("PDC_napms() - called: ms=%d\n", ms));
@@ -55,10 +55,15 @@ void PDC_napms(int ms)
if (!goal)
goal++;
goal += PDCCLOCK();
start = PDCCLOCK();
while (goal > PDCCLOCK())
goal += start;
while (goal > (current = PDCCLOCK()))
{
if (current < start) /* in case of midnight reset */
return;
regs.W.ax = 0x1680;
PDCINT(0x2f, regs);
PDCINT(0x28, regs);