Add ft_atol.c

1 files changed, 41 insertions, 0 deletions

diff --git a/ft_atol.c b/ft_atol.c
new file mode 100644
index 0000000..8184301
--- /dev/null
+++ b/ft_atol.c
@@ -0,0 +1,41 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atol.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/04/26 16:18:28 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/04/26 17:56:54 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+long	ft_atol(const char *str)
+{
+	long	result;
+	int		i;
+	int		posneg;
+
+	posneg = 1;
+	result = 0;
+	i = 0;
+	while ((str[i] >= '\t' && str[i] <= '\r') || str[i] == ' ')
+	{
+		i++;
+	}
+	if (str[i] == '-')
+	{
+		posneg = -1;
+		i++;
+	}
+	else if (str[i] == '+')
+		i++;
+	while (str[i] >= '0' && str[i] <= '9')
+	{
+		result = 10 * result + str[i] - '0';
+		i++;
+	}
+	return (result * posneg);
+}