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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_atoi.c                                          :+:    :+:            */
/*                                                     +:+                    */
/*   By: cwesseli <cwesseli@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2022/10/10 09:26:11 by cwesseli      #+#    #+#                 */
/*   Updated: 2022/10/26 10:37:02 by cwesseli      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	output = 0;
	sign = 1;
	while (ft_isspace(str[i]))
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (ft_isdigit(str[i]))
	{
		output = output * 10 + (str[i] - '0');
		i++;
	}
	return (sign * output);
}