[stdlib] Fix input() segfaults on EOF
#3919
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Signed-off-by: Raysan Alawami <[email protected]>
Signed-off-by: Raysan Alawami <[email protected]>
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input() segfaults on EOF
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pressing
ctrl-dwith no input wheninput()is called causes mojo to crash becauseread_until_delimiter()doesn't check the return value of the C functiongetdelim(). it assumesgetdelim()always succeeds and so, in the case of an error, it blindly creates aStringRefwith its length set to the return value - 1 (so the length is -2 in this case). thisStringRefis then passed toString()which in turn passes theStringReftomemcpy()with a count of -2 and ultimately crashing mojo.this pr adds a check in
read_until_delimiter()to check ifgetdelim()failed and raise an error if it does, along with a test to ensureread_until_delimiter()continues to behave as it should.related issue: #3908
closes: #3908