Reusing a static FCB for several file operations about cpm65 HOT 3 CLOSED

You do need to clear some. I don't know why they're not cleared for you. See F_OPEN here: https://www.seasip.info/Cpm/bdos.html EX, S1, S2, RC and CR are the ones specified in the documentation. S2 is cleared for you in the code but I forget why.

For clearing the whole structure... memset and fcb = {} should be equivalent in C. Really they should both produce a tiny embedded loop as that'd be more efficient than calling out to a function but I don't know whether llvm-mos does that or not.

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Thanks for the clarification, then it is just my poor knowledge of CP/M which is the issue. I assumed that cpm_file_close would set up the FCB used by fcb_file_open or fcb_file_create for a new file.

The fcb = {} syntax is more elegant for sure. I am still getting used to these 'modern' (i.e. anything not supported by Watcom ;) ) additions to C.

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Closed by #115

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