add libft, add gitignore

libft/ft_strjoin.c

@@ -0,0 +1,75 @@
+/* ************************************************************************** */
+/*																			*/
+/*														:::	  ::::::::   */
+/*   ft_strjoin.c                                       :+:      :+:    :+:   */
+/*													+:+ +:+		 +:+	 */
+/*   By: tomoron <marvin@42.fr>					 +#+  +:+	   +#+		*/
+/*												+#+#+#+#+#+   +#+		   */
+/*   Created: 2023/07/24 18:06:14 by tomoron		   #+#	#+#			 */
+/*   Updated: 2024/02/03 22:47:27 by tomoron          ###   ########.fr       */
+/*																			*/
+/* ************************************************************************** */
+
+#include "libft.h"
+
+static int	calc_str_len(char const *s1, char const *s2)
+{
+	int	res;
+	int	i;
+
+	res = 0;
+	i = 0;
+	while (s1[i])
+	{
+		i++;
+		res++;
+	}
+	i = 0;
+	while (s2[i])
+	{
+		i++;
+		res++;
+	}
+	return (res);
+}
+
+char	*ft_strjoin(char const *s1, char const *s2)
+{
+	char	*res;
+	int		len;
+	int		i;
+	int		j;
+
+	j = 0;
+	if (!s1 || !s2)
+		return (0);
+	len = calc_str_len(s1, s2);
+	res = malloc((len + 1) * sizeof(char));
+	while (res && s1[j])
+	{
+		res[j] = s1[j];
+		j++;
+	}
+	i = 0;
+	while (res && s2[i])
+	{
+		res[j] = s2[i];
+		i++;
+		j++;
+	}
+	if (res)
+		res[j] = 0;
+	return (res);
+}
+
+char	*ft_strjoin_free(char *s1, char *s2, int free_flags)
+{
+	char	*res;
+
+	res = ft_strjoin(s1, s2);
+	if (free_flags == 1 || free_flags == 3)
+		free(s1);
+	if (free_flags == 2 || free_flags == 3)
+		free(s2);
+	return (res);
+}