Re: Converting pointers to non nul-terminated C "strings" to Ada string

["Hibou57 (Yannick Duchêne)" <yannick_duchene@yahoo.fr>]

xorquew...@googlemail.com a écrit :
> Hello.
Hi, :-)

A dirty thing which comes into my mind : when you write

procedure memory_data
      (data   : out CS.chars_ptr;
       size   : out C.int);

you may doing some assumption about the the compiler's generated code.
In my humble opinion, pointers in C declarations should be mapped to
access types in Ada. There is nothing I know which assert that an Ada
implementation must use access types to implement out parameters.

> ... results in a String as long as the position of the first nul in
> the
> C string (the position is inevitably less than the length of the
> string).
 > Is it possible to properly convert unterminated C strings or do I
> need to start messing about with raw System.Address types?

If the returned string may have null characters before its last index,
this means it is a string which contains null characters as its
character datas, so it is not C string.

By the way, what does the null character stands for within these
strings ? Is it interpreted as a graphical character or as command
character ? What is supposed to be the string encoding ? ANSI ?
Windows CP ? UTF-8 ?

To know how to properly handle this, the first requirements is to
exactly know what does datas stands for.

Have a nice sunday

Y.D.