[Octave-bug-tracker] [bug #57644] fseek fread fail for files >4GB 5.1.0 on Windows10 64-bit x64 proc

[Markus Mützel]

Follow-up Comment #16, bug #57644 (project octave):

The offset argument for _lseek is of type long (see the link John provided).
Contrary to what one might expect, long has 32 bit on 64 bit Windows systems,
see e.g. [1].
So I think _lseeki64 must be used for files > 4 GiB no matter if Windows is 32
bit or 64 bit.

[1]:
https://docs.microsoft.com/en-us/cpp/build/common-visual-cpp-64-bit-migration-issues?redirectedfrom=MSDN&view=vs-2019

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