ft_strjoin: initial implementation

Makefile

@@ -6,7 +6,7 @@
 #    By: kcolin <marvin@42.fr>                      +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2024/10/14 13:43:59 by kcolin            #+#    #+#              #
-#    Updated: 2024/10/17 11:44:01 by kcolin           ###   ########.fr        #
+#    Updated: 2024/10/17 12:03:18 by kcolin           ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -35,7 +35,8 @@ SOURCES = ft_isalpha.c \
 	ft_atoi.c \
 	ft_calloc.c \
 	ft_strdup.c \
-	ft_substr.c
+	ft_substr.c \
+	ft_strjoin.c
 OBJECTS = $(SOURCES:.c=.o)
 CC = gcc
 

ft_strjoin.c

@@ -0,0 +1,45 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strjoin.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/17 12:03:29 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/17 12:09:03 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include <stdlib.h>
+
+char	*ft_strjoin(char const *s1, char const *s2)
+{
+	char	*out;
+	size_t	len;
+
+	len = ft_strlen(s1) + ft_strlen(s2) + 1;
+	out = malloc(len);
+	if (out == NULL)
+		return (NULL);
+	ft_strlcpy(out, s1, len);
+	ft_strlcat(out, s2, len);
+	return (out);
+}
+
+/*
+#include <stdio.h> // BAD
+
+int	main(int argc, char **argv)
+{
+	if (argc > 2)
+	{
+		char	*str;
+
+		str = ft_strjoin(argv[1], argv[2]);
+		printf("'%s'\n", str);
+		free(str);
+	}
+	return (0);
+}
+*/

libft.h

@@ -48,5 +48,6 @@ void	*ft_calloc(size_t nmemb, size_t size);
 
 char	*ft_strdup(const char *s);
 char	*ft_substr(char const *s, unsigned int start, size_t len);
+char	*ft_strjoin(char const *s1, char const *s2);
 
 #endif