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Don't compute SAC if total gas use is unknown

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If we breathe from a cylinder with invalid start or
end pressures, we cannot reliably compute the total gas
use and thus the SAC. So we should not pretend to do so.

A better fix would compute the total SAC for only those
segements that have valid start and end pressures.

Reported-by: Stefan Fuchs <sfuchs@gmx.de>
Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2018-05-17 21:25:57 +02:00
parent eb52f36cb6
commit fb09784060
1 changed files with 10 additions and 2 deletions
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12
core/divelist.c
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@ -374,8 +374,16 @@ static double calculate_airuse(struct dive *dive)
start = cyl->start.mbar ? cyl->start : cyl->sample_start;
end = cyl->end.mbar ? cyl->end : cyl->sample_end;
if (!end.mbar || start.mbar <= end.mbar)
continue;
if (!end.mbar || start.mbar <= end.mbar) {
// If a cylinder is used but we do not have info on amout of gas used
// better not pretend we know the total gas use.
// Eventually, logic should be fixed to compute average depth and total time
// for those segments where cylinders with known pressure drop are breathed from.
if (is_cylinder_used(dive, i))
return 0.0;
else
continue;
}
airuse += gas_volume(cyl, start) - gas_volume(cyl, end);
}