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Aren't ftell, ftello, and fgetpos supposed to diagnose EOVERFLOW? (A program could fopen, fread pieces totalling >4GB, and then call ftell.) Right now these functions all just truncate the result of _IO_seekoff to 32 bits (and treat 4294967295 as an error). Unless someone tells me why I'm wrong about thinking this is a bug, I will fix them to detect overflow.
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