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> Where did you gather the impression that NULL was a valid input for atoi()?

Yes, probably because of speed and simplicity C string functions doesn't check NULL pointers. When I program some higher-level function operating with pointers I usualy check for NULL at the beginning and return with error code.

This topic was many discused, e.g. here:
http://bytes.com/topic/c/answers/946249-passing-null-atoi-function-results-segmentation-fault
and here
http://stackoverflow.com/questions/8972247/what-if-null-is-passed-in-strchr
I compiled and run test program and it didn't crashed under WXP (DJGPP and MINGW binary) but it doesn't proof it's OK.

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