ft_atol.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atol.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rmikhayl <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/05/13 14:53:55 by rmikhayl          #+#    #+#             */
/*   Updated: 2024/05/13 14:54:01 by rmikhayl         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
long    ft_atol(const char *nptr)
{
    int     i;
    int     neg;
    long    res;
 
    i = 0;
    neg = 1;
    res = 0;
    while (nptr[i] == '\t' || nptr[i] == '\v' || nptr[i] == '\n'
        || nptr[i] == '\f' || nptr[i] == '\r' || nptr[i] == ' ')
        i++;
    if (nptr[i] == '-' || nptr[i] == '+')
    {
        if (nptr[i] == '-')
            neg = -neg;
        i++;
    }
    while (nptr[i] >= '0' && nptr[i] <= '9')
        res = res * 10 + (nptr[i++] - 48);
    return (res * neg);
}