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Gracefully handle infinite MND for oxygen

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When breathing pure oxygen and considering it not
narcotic, there is not maximal narcotic depth and
the formula divides by zero. So better, handle this
case separately.

Fixes #3080

Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2020-11-13 09:38:08 +01:00 • committed by Dirk Hohndel
parent 78da1869ce
commit 10bedf02d0
2 changed files with 6 additions and 1 deletions
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1
CHANGELOG.md
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@ -1,3 +1,4 @@
- core: Gracefully handle infinte MND for oxygen
- mobile: add location service warning as required by Google Play
- mobile: fix manually adding dives in the past [#2971]

6
core/dive.c
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@ -3253,7 +3253,11 @@ depth_t gas_mnd(struct gasmix mix, depth_t end, const struct dive *dive, int rou
int maxambient = prefs.o2narcotic ?
(int)lrint(ppo2n2.mbar / (1 - get_he(mix) / 1000.0))
:
(int)lrint(ppo2n2.mbar * N2_IN_AIR / get_n2(mix));
get_n2(mix) > 0 ?
(int)lrint(ppo2n2.mbar * N2_IN_AIR / get_n2(mix))
:
// Actually: Infinity
1000000;
rounded_depth.mm = (int)lrint(((double)mbar_to_depth(maxambient, dive)) / roundto) * roundto;
return rounded_depth;
}