Re: problems with interfacing c

[Stoik <staszek.goldstein@gmail.com>]

On Jan 20, 9:56 pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Thu, 20 Jan 2011 12:21:08 -0800 (PST), Stoik wrote:
> > I need your help in finding a proper Ada code to simulate the behaviour of the
> > following lines in C:
> > char *bufor = (char*)malloc(100000);
> > fread(bufor, 1, 100000, stdin);
>
> That depends on what are going to achieve. Translating the above literally:
>
> [ with Ada.Text_IO.Text_Streams;
>   use Ada.Text_IO, Ada.Text_IO.Text_Streams; ]
>
>    Buffer : String (1..100_000);
> begin
>    String'Read (Stream (Standard_Input), Buffer);
>
> [ Which certainly nobody would do, but you didn't provide any information
> about the actual problem. ]
>
> > I need to do it from inside of the Ada code. I tried to import fread, use the package
> > interfaces.c.strings etc, but in the end I always get the same message:
> > raised PROGRAM_ERROR : EXCEPTION_ACCESS_VIOLATION
> > Any ideas?
>
> You are using C bindings improperly and you need not C bindings in order to
> read the standard input.
>
> --
> Regards,
> Dmitry A. Kazakovhttp://www.dmitry-kazakov.de

Thanks for your suggestions and comments. The point is that I am
sending
a solution to a problem to a site managing programming contests, and
the stdin
is in fact redirected to some text file with data. I do not know how
big the data file
will be, I know only the upper limit. Quick reading of the data is the
key to success,
and the two lines of C work very well for the purpose. I have not
tried your solution,
is it not going to cause constraint_error when it meets the end of the
file?
The other question is - how to use the C bindings properly in such a
case?

Regards,
Staszek Goldstein