Re: Troubles with C strings

[Victor Porton <porton@narod.ru>]

Peter Chapin wrote:

> On 2014-07-26 11:15, Shark8 wrote:
> 
>> On 26-Jul-14 08:13, Victor Porton wrote:
>>> Also: It seems that in Interfaces.C.Strings there is no function which
>>> creates an Ada string of specified length from a chars_ptr (without
>>> checking for NUL).
>> 
>> Such a function cannot exist: to determine the length of a C-style
>> string you *must* scan through it for the terminating NULL. What you
>> describe would be a "substring" method that can read beyond the
>> string-bounds without raising an error... and I see no way that would
>> end well.
> 
> Well the function could exist; it would just require an additional
> parameter to specify how much should be copied. While such an approach
> might be contrary to the sensibilities of Ada programmers, I don't think
> C programmers would find it shocking.
> 
> Of course we are talking about an Ada interface here so adding a
> function that by its nature could easily lead to undefined behave...
> er... erroneous execution probably wouldn't be great.

Jut call this function *_Unchecked or *_Unsafe and it would turn it safe. 
:-)

-- 
Victor Porton - http://portonvictor.org