ft_cub3d/strtol.c at main · Emine-42/ft_cub3d · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   strtol.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: macheuk- <macheuk-@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/06/16 04:58:40 by macheuk-          #+#    #+#             */
/*   Updated: 2025/06/16 06:18:42 by macheuk-         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "cub3d.h"

char	*skip_whitespace_and_sign(char *str, int *sign)
{
	while (*str == ' ' || *str == '\t')
		str++;
	*sign = 1;
	if (*str == '-')
	{
		*sign = -1;
		str++;
	}
	else if (*str == '+')
		str++;
	return (str);
}

// Helper: Convert a single hex digit to int
int	hex_digit(char c)
{
	if (c >= '0' && c <= '9')
		return (c - '0');
	if (c >= 'a' && c <= 'f')
		return (c - 'a' + 10);
	if (c >= 'A' && c <= 'F')
		return (c - 'A' + 10);
	return (-1);
}

// Helper: Parse number part
long	parse_number(char *str, int base, char **end)
{
	long	result;
	int		val;

	result = 0;
	val = hex_digit(*str);
	while ((*str >= '0' && *str <= '9') || (base == 16 && (val != -1)))
	{
		if (*str >= '0' && *str <= '9')
			result = result * base + (*str - '0');
		else if (base == 16 && hex_digit(*str) != -1)
			result = result * base + hex_digit(*str);
		str++;
		val = hex_digit(*str);
	}
	if (end)
		*end = str;
	return (result);
}

long	ft_strtol(char *str, char **endptr, int base)
{
	long	result;
	char	*end;
	int		sign;

	str = skip_whitespace_and_sign(str, &sign);
	result = parse_number(str, base, &end);
	if (endptr)
		*endptr = (char *)end;
	return (result * sign);
}