Abuse: Ticket #41: Design away kludge in file opening code
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In order to determine whether get_filename_prefix()/spec_prefix should be prepended to the requested filename, both open_FILE() in game.cpp and jFILE::open_external() in imlib/specs.cpp currently use a kludge that bases the decision on whether or not the requested filename begins with a forward slash.
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This is problematic for porting because some platforms require absolute paths that begin with something other than a slash (e.g., a device name), but it's also an odd design in general that requires the caller to know about and prepend the save path prefix but not the data path prefix.
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I'm pretty sure that there are only two classes of files that the game should be attempting to open via these functions:
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<ol><li>Game data files, which should have get_filename_prefix() prepended, and
</li><li>Game save files, which should have get_save_filename_prefix() prepended.
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As a result, it seems to me that a better design would be to either force the caller to prepend the prefixes ahead of time, or else parameterize(*) the functions to force the caller to specify which prefix should be prepended.
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<em>* - the parameter could be optional, defaulting to whichever prefix makes more sense.</em>
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Additionally, open_FILE() prepends a space between get_filename_prefix() and the filename, which might be a bug.
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