#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define MAXBYTEADDR 65535
static unsigned char mem[MAXBYTEADDR];

/*
 *	Return the numeric value represented by the hex digit c.
 */
struct assoc {
  char c;
  int  v;
};

struct assoc hexval[] = {{'0',0},{'1',1},{'2',2},{'3',3},{'4',4},
			 {'5',5},{'6',6},{'7',7},{'8',8},{'9',9},
			 {'a',10},{'b',11},{'c',12},{'d',13},{'e',14},{'f',15},
			 {'A',10},{'B',11},{'C',12},{'D',13},{'E',14},{'F',15}};
int getval (char c) {
  int i;
  for (i=0; i < sizeof(hexval); i++) 
    if (hexval[i].c == c) return hexval[i].v;
  return 0;
}

/*
 *	Return the integer representation of the four-character string of hex digits.
 */
int toInt (char in[]) {
  int k, val;
  for (val=0, k=0; k<4; k++) val = val*16 + getval(in[k]);
  return val;
}

int getop(unsigned int inst) {
  return (inst >> 12) & 0xF;
}

char *opcodes[] = {"add","or","xor","and","addi","rotr","st","ld","ldi",
		   "uu","bneg","bz","jr","uu","uu","jmp"};

int main (int argc, char* argv[]) {
  FILE *in;
  char line[256];
  int addr = 0;
  unsigned int inst;
  if (argc != 2) {
    fprintf (stderr, "wrong number of arguments (one expected)\n");
    exit (1);
  }
  in = fopen (argv[1], "r");
  if (in == NULL) {
    fprintf (stderr, "can't open %s\n", argv[1]);
    exit (1);
  }
  while (fgets(line, 256, in)) {
    inst = toInt(line);
    printf("%4x: %4X %s\n", addr,inst, opcodes[getop(inst)]);
    addr = addr+2;
  }
}