util.c File Reference

You will modify this file and implement the util.h interface. More...

#include <strings.h>
#include <stdlib.h>
#include <ctype.h>
#include "util.h"

Functions
name_val_t *	util_bin_search (name_val_t map[], int numNames, const char *name)
opcode_t	util_get_opcode (const char *name)
bool	util_is_valid_label (const char *s)
int	util_get_reg (const char *regStr)
int	util_parse_cond (const char *condCodeStr)
bool	util_get_int (const char *token, int *value)

Variables
static name_val_t	lc3_instruction_map []
static int	numOps = 0
static name_val_t	register_map []
static int	numRegisters = sizeof(register_map) / sizeof(register_map[0])

Detailed Description

This is a implementation of the interface that you will write for the assignment.

Author

your name here

Function Documentation

name_val_t* util_bin_search	(	name_val_t	map[],
		int	numNames,
		const char *	name
	)

Todo:

implement this function

bool util_get_int	(	const char *	token,
		int *	value
	)

Todo:

implement this function

opcode_t util_get_opcode

(

const char *

name

)

Todo:

implement this function

int util_get_reg

(

const char *

regStr

)

This is an example of how to use the binary search routine

bool util_is_valid_label

(

const char *

s

)

Todo:

implement this function

int util_parse_cond

(

const char *

condCodeStr

)

Todo:

implement this function

Variable Documentation

name_val_t lc3_instruction_map[]

static

Initial value:

= {
  { ".BLKW",    OP_BLKW },
  { "TRAP",     OP_TRAP }
}

Todo:

complete the initializtion of this data structure A sorted list of all the opcode names the assembler might see. There are more entries than there are opcodes because some LC3 instructions have multiple forms. These include JSR/JSRR, RET/JMP, the eight BR instructions and various pseudo-ops. In other implementations, this might be a hash table or a BST.

int numOps = 0

static

Todo:

initialize this value

int numRegisters = sizeof(register_map) / sizeof(register_map[0])

static

This is an example of how to let the compiler figure out how many entries there are.

name_val_t register_map[]

static

Initial value:

= {
  { "R0", 0},
  { "R1", 1},
  { "R2", 2},
  { "R3", 3},
  { "R4", 4},
  { "R5", 5},
  { "R6", 6},
  { "R7", 7},
}

This is an example of how to initialize an array of structs