atoi_errable.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   atoi_errable.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tgrekov <tgrekov@student.hive.fi>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/07/22 04:30:45 by tgrekov           #+#    #+#             */
/*   Updated: 2024/08/25 12:37:38 by tgrekov          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
int atoi_errable(const char *str, int *n)
{
    static const int    ft_int_max = 2147483647;
    int                 sign;
 
    while (*str == ' ' || *str == '\t' || *str == '\n'
        || *str == '\v' || *str == '\f' || *str == '\r')
        str++;
    sign = 1;
    if (*str == '-' || *str == '+')
    {
        if (*str == '-')
            sign *= -1;
        str++;
    }
    *n = 0;
    while (*str >= '0' && *str <= '9')
    {
        if (*n > ft_int_max / 10 || (*n == ft_int_max / 10 && *str > '7'))
            return (1);
        *n = *n * 10 + (*(str++) - '0');
    }
    *n = *n * sign;
    return (0);
}