#include <stdio.h>

int
main (void)
{
  char *bp;
  size_t size;
  off_t end;
  FILE *stream;

  stream = open_memstream (&bp, &size);
  fprintf (stream, "hello");
  fflush (stream);
  printf ("buf = `%s', size = %ld\n", bp, size);
  
  fprintf (stream, ", world");
  fflush (stream);
  printf ("buf = `%s', size = %ld\n", bp, size);
  
  end = ftell (stream);
  fseek (stream, 0, SEEK_SET);
  fprintf (stream, "heyho");
  fflush (stream);
  printf ("buf = `%s', size = %ld\n", bp, size);
  
  fseek (stream, end, SEEK_SET);
  fclose (stream);
  printf ("buf = `%s', size = %ld\n", bp, size);
  
  return 0;
}