Common page-code parsing extracted into a parse_page_code() helper. While at it, return real error values (-EINVAL, etc.) rather than -1, and rename retval to r throughout for consistency. The body of main is moved to new run. The closing of logging file descriptors is dropped. They will be closed automatically anyway. Not sure what the original purpose of that code was. The code is also modernized in various places… though more changes could be made. The return convention of help() and similar functions is changed to usual negative/0/1, where 0 means that the caller should quit. set_inq_values would return positive error values too, which was previously ignored. It's not entirely clear, but that doesn't seem to have been on purpose.
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