get_opcode.c

#include "monty.h"

/**
 * _isnumber - checks leading character of operand read
 * @s: argument read
 * Return: 1 if true else 0
 *
 */
int _isnumber(char *s)
{
	int i;

	for (i = 0; s[i]; i++)
	{
		if (!((s[i] >= '0' && s[i] <= '9') || (s[i] == '+') || (s[i] == '-')))
			return (0);
	}
	return (1);
}

/**
 * get_opcode - gets and executes opcode
 * @head: pointer to list head
 * @line_number: command line number
 */

void get_opcode(stack_t **head, unsigned int line_number)
{
	int l = 0;
	instruction_t opcodes[] = {
		{"nop", nop}, {"pall", pall},
		{"pint", pint}, {"swap", swap},
		{"pop", pop}, {"add", add}, {"pstr", pstr},
		{"sub", sub}, {"div", _div}, {"pchar", pchar},
		{"mul", mul}, {"mod", mod},
		{"rotl", rotl}, {"rotr", rotr}, {"stack", stack}};

	while (l < 15)
	{
		if (strcmp((const char *)opcode_read[0], "push") == 0)
		{
			if (!opcode_read[1])
			{
				fprintf(stderr, "L%d: usage: push integer\n", line_number);
				free_grid(opcode_read);
				free_list(*head);
				exit(EXIT_FAILURE);
			}
			push(head, opcode_read[1], line_number);
			return;
		}
		if (strcmp((const char *)opcode_read[0],
					(const char *)opcodes[l].opcode) == 0)
		{
			opcodes[l].f(head, line_number);
			return;
		}
		l++;
	}
	fprintf(stderr, "L%d: unknown instruction %s\n", line_number, opcode_read[0]);
	free_list(*head);
	free_grid(opcode_read);
	exit(EXIT_FAILURE);
}