Add libft and input handling

1 files changed, 68 insertions, 0 deletions

diff --git a/libft/ft_itoa.c b/libft/ft_itoa.c
new file mode 100644
index 0000000..401ba6a
--- /dev/null
+++ b/libft/ft_itoa.c
@@ -0,0 +1,68 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itoa.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/10 10:42:08 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/10 13:18:58 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+static int	get_last_digit(int n)
+{
+	int	last_digit;
+
+	last_digit = n % 10;
+	if (last_digit < 0)
+		last_digit *= -1;
+	return (last_digit);
+}
+
+static int	get_len(int n)
+{
+	int	len;
+
+	len = 0;
+	if (n == 0)
+		return (1);
+	if (n < 0)
+		len++;
+	while (n)
+	{
+		len++;
+		n /= 10;
+	}
+	return (len);
+}
+
+char	*ft_itoa(int n)
+{
+	char	*result;
+	int		len;
+
+	len = get_len(n);
+	result = malloc(sizeof(char) * (len + 1));
+	if (!result)
+		return (0);
+	result[len] = '\0';
+	if (n == 0)
+		result[0] = '0';
+	if (n < 0)
+		result[0] = '-';
+	while (n)
+	{
+		result[--len] = '0' + get_last_digit(n);
+		n /= 10;
+	}
+	return (result);
+}
+
+/* #include <stdio.h> */
+/* int main() { */
+/*     char* itoa = ft_itoa(0); */
+/*     printf("%s\n", itoa); */
+/* } */