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Fixed crash in rand (#7103)

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Yuriy Glukhov 2018-01-18 20:47:58 +03:00 • committed by Andreas Rumpf
commit 1b3f640188
1 changed files with 5 additions and 0 deletions
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5
lib/pure/random.nim
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@ -115,6 +115,7 @@ proc rand*(r: var Rand; max: int): int {.benign.} =
## random number is always the same, unless `randomize` is called ## random number is always the same, unless `randomize` is called
## which initializes the random number generator with a "random" ## which initializes the random number generator with a "random"
## number, i.e. a tickcount. ## number, i.e. a tickcount.
if max == 0: return
while true: while true:
let x = next(r) let x = next(r)
if x <= randMax - (randMax mod ui(max)): if x <= randMax - (randMax mod ui(max)):
@ -213,4 +214,8 @@ when isMainModule:
shuffle(a) shuffle(a)
doAssert a[0] == 1 doAssert a[0] == 1
doAssert a[1] == 0 doAssert a[1] == 0
doAssert rand(0) == 0
doAssert rand("a") == 'a'
main() main()