1) In main.c the vals array is statically sized at 256 entries, but entries are put into it mod terminal width, with no guarantee that the terminal is <= 256 ch

1) In main.c the vals array is statically sized at 256 entries, but entries are put into it mod terminal width, with no guarantee that the terminal is <= 256 characters wide. That will lead to a buffer overflow. 2) INT_MIN cannot be negated -- you should check for that and just use INT_MAX instead.