[task #16114] Print warning where integer overflow happens

[Siyang He]

Follow-up Comment #5, task #16114 (project gnuastro):

I took a look at this.

Initially I tried to check errno's value against ERANGE, but never found a
match. From googling I get the sense that it's on the C function's part to set
errno (as opposed to having the OS set it automatically).

If this is true then I'd have to write overflow checks for each operator.

...so I wrote an overflow checker for addition. Right now I am calling the
checker from arithmetic_binary() within lib/arithmetic.c. Specifically,
arithmetic_binary() calls the checker before calling arithmetic_plus(). If
this is a good place to call the checker then I can go ahead and write
checkers for other operators.

As an aside, while testing my checker I found the following :


>$ astarithmetic 4 -128 int8 +
-128


I don't think I see this on the task list.


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