Besides making sure you are using the right interger size when using interoperable files, this week we 'rediscovered' the dangers of the NULL pointer in x84_64.
When using a c function with ellipses, the compiler does not 'know' the size of the null pointer and convers the appareance on 'NULL' into a 0(zero). Thus, making some functions not work correctly unless the NULL pointer is casted to an 'appropiate pointer'. (Why this? this is already a pointer..)
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