Add libft and input handling

1 files changed, 42 insertions, 0 deletions

diff --git a/libft/ft_printaddr.c b/libft/ft_printaddr.c
new file mode 100644
index 0000000..f60ce0d
--- /dev/null
+++ b/libft/ft_printaddr.c
@@ -0,0 +1,42 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_printaddr.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/15 10:33:53 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/18 11:42:58 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_printf.h"
+
+static void	printaddr_rec(unsigned long addr, int *len)
+{
+	char	c;
+	int		success;
+
+	if (*len < 0)
+		return ;
+	if (addr % 16 < 10)
+		c = '0' + (addr % 16);
+	else
+		c = ('a' - 10) + (addr % 16);
+	if (addr > 15)
+		printaddr_rec(addr / 16, len);
+	success = write(1, &c, 1);
+	if (success < 0 || *len < 2)
+		*len = -1;
+	else
+		(*len)++;
+}
+
+int	ft_printaddr(void *addr)
+{
+	int	len;
+
+	len = write(1, "0x", 2);
+	printaddr_rec((unsigned long)addr, &len);
+	return (len);
+}