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Newsgroups: comp.lang.ada
Date: Fri, 7 Jul 2017 16:14:13 -0700 (PDT)
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Subject: Re: Convert chars_ptr to Ada String
From: Anh Vo <anhvofrcaus@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:47327
Date: 2017-07-07T16:14:13-07:00
List-Id: <comp.lang.ada>

On Friday, July 7, 2017 at 3:49:20 PM UTC-7, Victor Porton wrote:
> Anh Vo wrote:
> 
> > On Friday, July 7, 2017 at 2:03:32 PM UTC-7, Victor Porton wrote:
> >> Remind me how to convert a pair of Ptr: chars_ptr and Size: size_t to an
> >> Ada string.
> >> 
> >> Ptr may contain NULs and this should not influence the length of the
> >> resulting string.
> > 
> > Look at APIs defined in package Interfaces.C.Strings.
> 
> I've done it:
> 
> https://github.com/vporton/redland-bindings/blob/ada2012/ada/src/rdf-auxiliary-convert.adb
> 
> It requires not only Interfaces.C.Strings but also Interfaces.C.Pointers
> to make things more confusing.

Why make it more confusing while it is actually simpler as shown below.

with Interfaces.C.Strings; use Interfaces.C.Strings;

package body RDF.Auxiliary.Convert is

   function Value_With_Possible_NULs (Item: RDF.Auxiliary.C_Pointers.Pointer; Length: size_t) return String is
   begin
      return To_Ada(Item, Length);
   end;

end RDF.Auxiliary.Convert;