codedprinc/monty

2nd alx project

Monty

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• Monty is an interpreter for Monty ByteCodes files.
• Monty 0.98 is a scripting language that is first compiled into Monty byte codes (Just like Python). It relies on a unique stack, with specific instructions to manipulate it.

The monty program

• Usage: monty file
  • where file is the path to the file containing Monty byte code.
• If the user does not give any file or more than one argument to your program, print the error message USAGE: monty file, followed by a new line, and exit with the status EXIT_FAILURE
• If, for any reason, it’s not possible to open the file, print the error message Error: Can't open file <file>, followed by a new line, and exit with the status EXIT_FAILURE
  • where <file> is the name of the file
• If the file contains an invalid instruction, print the error message L<line_number>: unknown instruction <opcode>, followed by a new line, and exit with the status EXIT_FAILURE
  • where is the line number where the instruction appears.
  • Line numbers always start at 1
• The monty program runs the bytecodes line by line and stop if either:
  • it executed properly every line of the file
  • it finds an error in the file
  • an error occured
• If you can’t malloc anymore, print the error message Error: malloc failed, followed by a new line, and exit with status EXIT_FAILURE.
• You have to use malloc and free and are not allowed to use any other function from man malloc (realloc, calloc, …)

Task	Description
0.push, pall	Implement the push and pall opcodes.
	The push opcode
	The opcode push pushes an element to the stack.
	- Usage: push <int>
	- where <int> is an integer
	- if <int> is not an integer or if there is no argument given to push, print the error message L<line_number>: usage: push integer, followed by a new line, and exit with the status EXIT_FAILURE
	- where is the line number in the file
	- You won’t have to deal with overflows. Use the atoi function
	The pall opcode
	The opcode pall prints all the values on the stack, starting from the top of the stack.
	- Usage pall
	- Format: see example
	- If the stack is empty, don’t print anything
1.pint	Implement the pint opcode.
	The pint opcode
	The opcode pint prints the value at the top of the stack, followed by a new line.
	- Usage: pint
	- If the stack is empty, print the error message L<line_number>: can't pint, stack empty, followed by a new line, and exit with the status EXIT_FAILURE
2.pop	Implement the pop opcode.
	The pop opcode
	The opcode pop removes the top element of the stack.
	- Usage: pop
	- If the stack is empty, print the error message L<line_number>: can't pop an empty stack, followed by a new line, and exit with the status EXIT_FAILURE
3.swap	Implement the swap opcode.
	The swap opcode
	The opcode swap swaps the top two elements of the stack.
	- Usage: swap
	- If the stack contains less than two elements, print the error message L<line_number>: can't swap, stack too short, followed by a new line, and exit with the status EXIT_FAILURE
4.add	Implement the add opcode.
	The add opcode
	The opcode add adds the top two elements of the stack.
	- Usage: add
	- If the stack contains less than two elements, print the error message L<line_number>: can't add, stack too short, followed by a new line, and exit with the status EXIT_FAILURE
	- The result is stored in the second top element of the stack, and the top element is removed, so that at the end:
	- The top element of the stack contains the result
	- The stack is one element shorter
5.nop	Implement the nop opcode.
	The nop opcode
	The opcode nop doesn’t do anything.
	- Usage: nop