[Plplot-devel] X20C.C bug fixed - problem with "plAlloc2dGrid"

[Andrew R. <ar...@ge...>]

I finally found the error in X20C that was causing SIGFP errors. The error
was being tripped by a floating point exception in "plMinMax2dGrid", which
in turn was being caused by a miss-allocation in "plAlloc2dGrid".
"plAlloc2dGrid" has always worked in the past with DJGPP so why it stopped
working now, and only with X20C.C, I don't know. Any clues ? 

I changed the memory allocation from malloc to calloc, ensuring the buffer
was zeroed, and at the same time put in a quick memory checking routine.
That should not effect "plAlloc2dGrid" at all by my reading, but it does
somehow, at least for DJGPP. So all now seems fine on the DJGPP front... I
hope I have not upset anything for you linux guys with my change. If so, I
am sure you will let me know ;-)

- Andrew