Monty Language Interpreter

Monty 0.98 is a scripting language that is compiled into bytecodes. It relies on a stack with instructions to manipulate it. This program is an interpreter for Monty bytecode files.

Usage

All files should be compiled with gcc -Wall -Werror -Wextra -pedantic *.c -o monty.

Usage: monty file

Example:

Structure of a Monty bytecode file:

push 1
push 2
push 3
pall
pint

Output

Monty Bytecode Commands

push <int> - pushes an integer onto the top of the stack
pop - removes the top element of the stack
swap - swaps the top two elements of the stack
nop - does nothing
pall - prints all values on the stack
pint - prints the value at the top of the stack
pchar - prints the char at the top of the stack
pstr - prints the string starting at the top of the stack
add - adds the top two elements of the stack
sub - subtracts the top element of the stack from the second element of the stack
mul - multiplies the top two elements of the stack
div - divides the second element of the stack by the top element of the stack
mod - returns the remainder of dividing the second element of the stack by the top element of the stack

Project Requirements

Formatted with Betty style standards
Compiled with gcc 4.8.4 (C90) using the flags -Wall -Werror -Wextra and -pedantic
Maximum of one global variable
No more than 5 functions per file
Function prototypes should be included in a header file called monty.h
Header files should be include guarded

Project Data Structure

/**
 * struct stack_s - doubly linked list representation of a stack (or queue)
 * @n: integer
 * @prev: points to the previous element of the stack (or queue)
 * @next: points to the next element of the stack (or queue)
 *
 * Description: doubly linked list node structure
 * for stack, queues, LIFO, FIFO Holberton project
 */
typedef struct stack_s
{
        int n;
        struct stack_s *prev;
        struct stack_s *next;
} stack_t;



/**
 * struct instruction_s - opcoode and its function
 * @opcode: the opcode
 * @f: function to handle the opcode
 *
 * Description: opcode and its function
 * for stack, queues, LIFO, FIFO Holberton project
 */
typedef struct instruction_s
{
        char *opcode;
        void (*f)(stack_t **stack, unsigned int line_number);
} instruction_t;

File Descriptions

monty.h - function declarations
structs.h - struct declarations
monty.c - main function and loop
opcode_struct.c - function that searches through struct of function pointers
print_functions.c - functions that print values from stack
stack_functions.c - functions that manipulate the stack
calc_functions.c - math functions performed on values on the stack
util_functions.c - utility functions

Authors

Carrie Ybay - GitHub | Twitter

Elaine Yeung - GitHub | Twitter

yeungegs/monty