#include <stdio.h>
#include <string.h>
#include "input.h"
#include "output.h"


#define MAX_HASHTABLE_SIZE              64


//global variable definitions
char *infile_name;
Table_T symbol_table;
struct section *text;
struct section *data;
struct section *bss;

int mycmp (const void *x, const void *y)
{
  return (strcmp ((char *)x, (char *)y));
}

unsigned myhash (const void *key)
{
  int i;
  unsigned int sum;

  sum = 0;
  for (i = 0; i < strlen ((char*) key); i++)
  {
    sum += *((char *)key + i);
  }
 
  return (sum % (MAX_HASHTABLE_SIZE-1));
}

int main (int argc, char *argv[])
{
  /***************************
  (1) process the command line
  ***************************/
  if (argc != 2)
  {
    fprintf (stderr, "Command format: myas <Input File Name>\n");
    return (-1);
  }
  infile_name = argv[1];
  if ((infile_name[strlen(infile_name)-2] != '.') ||
      (infile_name[strlen(infile_name)-1] != 's')
     )
  {
    fprintf (stderr, "Input file must be .s file\n");
    return (-1);
  }

  /***************************************************
  (2) parse the input file into a list of instructions
  ***************************************************/
  first = NULL;
  input ();

  /*************
  (3) two passes 
  *************/
  symbol_table = Table_new (0, mycmp, myhash);
  text = NULL;
  data = NULL;
  bss = NULL;
  pass1 (); //please implement this function
  /* print_passes(); */
  pass2 (); //please implement this function
  /* print_passes(); */

  /**********************************************************
  (4) write the output file in Executable and Linkable Format 
  **********************************************************/
  output (); 

  /**************
  (5) free memory
  **************/
  free_input ();
  free_output ();

  return (0);
}