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…vention This avoids warnings from compilers.
Old test was *p && isdigit(*p) && *p != '/' - this didn't detect and handle buffer underrun - *p should never be '\0' - if isdigit(*p) then *p cannot be '/' What should be done when the remainder of the name is empty? It would be good to explain why a suffix <digit>p is treated specially.
GCC thinks that "part" might be used (dereferenced) without initialization. It looks to me as if GCC's warning is correct. I initialize part to NULL to make sure such a use segfaults rather than do something random. What is the correct fix? GCC thinks that "disk" might be used without initialization. GCC's warning is wrong; initialize "disk" to silence GCC.
It could be that the correct fix would have been to conditionally set draw_this_time to 0.
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I have fixed a few bugs and made some code clearer.
I have NOT done sufficient testing.
I've tried to make each commit small and clear.
There are a few places where I added comments with "???".
These are at points where something should be done but I don't know what that is.