Re: Lost information converting decoded value to in32_t

[Richard Frith-Macdonald]

> On 25 May 2020, at 22:57, Riccardo Mottola <address@hidden> wrote:

> Looking up on the internet, I found the explanation is that the literal is 
> only the number part without signed, regarless if it is a signed or unsigned 
> decimal. Then the - operator is performed. For this reason it is usually 
> written as (-2147483647 -1) in the limits header files.
> With that explanation, it is promoted to the "unsinged" type and then the "-" 
> operation fails and underflows.
> 
> For that reason I propose to change the lower bounds check to an equivalent 
> easy to read
>            if (big > 2147483647 || big + 2147483648 < 0

Great ...  I copied that t NSPortCoder.m