calling c from gprolog

[Pedro Salgueiro]

Hi.
I'm trying to call c from gprolog and I have some
problems when I use the foreign type "-string" to
obtain the result of the c function.

This the file teste.c:

#include "gprolog.h"

Bool test(char *in, char *out){

  //out = (char *) malloc(1024*sizeof(char));
  //out = (char *) alloca(1024);

  sprintf(out, "teste");
  printf("IN:%s\n", in);
 
  return TRUE;          /* succeed */
};


And this is the file test.pl

:- foreign(test(+string,-string)).

when I compile both of them with:
gplc test.c test.pl
I get an executable file.
When I run this file and enter "test(xpto, X)."
gprolog 
just crahs, with the folowing error:

Fatal Error: Segmentation Violation

Anyone knows how to put this little exmaple working.

Thank's.
Pedro Salgueiro
./test

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