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Some locales (e.g. fr_FR.UTF-8 on ArchLinux) don't split the string stream on a space. As such, when extracted formatted data from te stream, it will return the two numbers as one for the first call, effectively overflowing the u32 variable, then will do an out-of-bounds read for the second call. Forcing the use of the C locale on the streams where it would cause a problem allows to workaround this behavior.