ft_atof.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atof.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rmikhayl <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/05/15 14:50:17 by rmikhayl          #+#    #+#             */
/*   Updated: 2024/05/15 14:50:18 by rmikhayl         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
double  ft_atof(const char *str)
{
    double  res;
    double  neg;
    double  divider;
    size_t  i;
 
    divider = 0.1;
    res = 0;
    neg = 1;
    i = -1;
    while (str[i] < '0' || str[i] > '9')
        if (str[i++] == '-')
            neg = -1;
    while (str[i] >= '0' && str[i] <= '9')
    {
        res = res * 10 + str[i++] - 48;
    }
    if (str[i] == '.' || str[i] == ',')
        i++;
    while (str[i] >= '0' && str[i] <= '9')
    {
        res = res + (str[i] - 48) * divider;
        divider /= 10;
        i++;
    }
    return (res * neg);
}