#include <time.h>
#include <stdio.h>

#include "datasource.h"

static unsigned char last_rd_char[1024];

static unsigned char last_wt_char[1024];

int sopen_rd( )
{
  static int last_rd_id = 0;

  last_rd_char[last_rd_id] = 0;

  return last_rd_id++;
}

int sread( void* buf, int n, int fd )
{
  int i;

  if( n <= 0 )
	return -1;

  for( i = 0; i < n; i++ )
	((unsigned char*)buf)[i] = last_rd_char[fd]++;

  return n;
}

int sopen_wt( )
{
  static int last_wt_id = 0;

  last_wt_char[last_wt_id] = 0;

  return last_wt_id++;
}

int swrite( void* buf, int n, int fd )
{
  int i;
  int r = 0;

  if ( n <= 0 )
	return -1;
  
  for( i = 0; i < n; i++ )
	if( ((unsigned char*)buf)[i] != last_wt_char[fd]++ )
		r = -1;

  if( r == -1 )
	fprintf( stderr, "Data Error!\n");

  return n;
}