libft/ft_atoi.c at main · umarsajidm/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: musajid <musajid@student.hive.fi>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/05/07 13:37:31 by musajid           #+#    #+#             */
/*   Updated: 2025/05/23 18:54:51 by musajid          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	i;
	int	result;
	int	sign;

	i = 0;
	result = 0;
	sign = 1;
	while (str[i] == ' ' || (str[i] >= 9 && str[i] <= 13))
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (str[i] != '\0' && (str[i] >= '0' && str[i] <= '9'))
	{
		result = result * 10 + (str[i] - '0');
		i++;
	}
	return (sign * result);
}