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This closes #250, which was a duplicated/simplified version of the original issue #234. Here we've updated the RC calculation, and applied it consistently, and switched to only updating the modified fields in the FCB stored by the caller in RAM - instead of blurting the whole structure back into place. This covers the case where the read/write overlaps with the actual FCB area, which is .. possible and horrid in equal measure. With this pull-request there are now zero known flaws in our file-handling.
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This closes #250, which was a duplicated/simplified version of the original issue #234.
Here we've updated the RC calculation, and applied it consistently, and switched to only updating the modified fields in the FCB stored by the caller in RAM - instead of blurting the whole structure back into place.
This covers the case where the read/write overlaps with the actual FCB area, which is .. possible and horrid in equal measure.
With this pull-request there are now zero known flaws in our file-handling.