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D64-Disk-Image-0.02
River stage one • 1 direct dependent • 1 total dependent
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Changes for version 0.02 - 2013-01-12

  • Fixed "Segmentation fault" exception on OpenBSD and alikes, which was originally caused by closing an opened file without having written any data into it. Such operation had resulted in creating a new diskfile with track and sector values both initialized to $00. When trying to open such a saved file in OpenBSD environment by getting a pointer to block data (with "get_ts_addr" function) an illegal address had actually been retrieved, which was causing "Segmentation fault" exception while attempted to be read from. The reason why this bug has manifested itself on OpenBSD systems lays in the memory management specifics of OpenBSD. Apparently reading from an invalid address on Linux and alikes results in retrieving a "(nil)" value, which then gets successfully assigned to a char variable. The final fix was very simple and included an attempt to write a single byte of data into each file that was opened for writing and closed before any actual data has been actually written into it, and thus making sure that both track and sector values will get correctly initialized on a new disk directory item creation. Of course the ultimate fix would be to implement proper file save operation in the "diskimage.c" library, however creation of an empty file with no single byte of data is not only very unlikely, but also quite useless for any practical purpose (since the entire 254-bytes sector will always get allocated anyway).

Modules

D64::Disk::Image
Perl interface to Per Olofsson's "diskimage.c", an ANSI C library for manipulating Commodore disk images
D64::Disk::Image::File
File I/O portion of Perl interface to Per Olofsson's "diskimage.c", an ANSI C library for manipulating Commodore disk images

Other files