Re: [ft-devel] those OVERFLOW_* macros and Fontval b69 (Re: Freetype-devel Digest, Vol 149, Issue 5

[Werner LEMBERG]

>> However, the majority of input data in most formats are deltas, and
>> here you would have to check after every addition, subtraction, or
>> multiplication whether you get something `unreasonable'.
> 
> BTW are you aware of gcc's and clang's built-in functions that perform
> arithmetic with overflow checking?  Maybe they could help.
> https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html

Thanks, I know these functions.  They would help if I wanted to do
something in case of overflow.  However, I want to do *nothing*, so I
simply use casts.


    Werner