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.

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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

3
2
1
3

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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

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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;

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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

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Authors

Carrie Ybay - GitHub | Twitter

Elaine Yeung - GitHub | Twitter