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Warning on GetRandomValue range limit (#2800)

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Added a comment explaining the range limitations of GetRandomValue.
Added a run-time warning TRACELOG when GetRandomValue is called with an invalid range.
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Pere001 2022-11-15 12:29:19 +01:00 committed by GitHub
parent 2604b9f72b
commit c8fd93d356
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1 changed files with 7 additions and 0 deletions
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src/rcore.c
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@ -2816,6 +2816,13 @@ int GetRandomValue(int min, int max)
max = min; max = min;
min = tmp; min = tmp;
} }
// WARNING: Ranges higher than RAND_MAX will return invalid results. More specifically, if (max - min) > INT_MAX there will
// be an overflow, and otherwise if (max - min) > RAND_MAX the random value will incorrectly never exceed a certain threshold.
if ((unsigned int)(max - min) > (unsigned int)RAND_MAX)
{
TRACELOG(LOG_WARNING, "Invalid GetRandomValue arguments. Range should not be higher than %i.", RAND_MAX);
}
return (rand()%(abs(max - min) + 1) + min); return (rand()%(abs(max - min) + 1) + min);
} }