libft/ft_strjoin.c at main · gysiang/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gyong-si <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/09/14 17:23:41 by gyong-si          #+#    #+#             */
/*   Updated: 2023/09/15 11:45:28 by gyong-si         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"
#include <stdlib.h>

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*result;
	size_t	len1;
	size_t	len2;

	if (!s1 && !s2)
		return (ft_strdup(""));
	if (s1 && !s2)
		return (ft_strdup(s1));
	if (!s1 && s2)
		return (ft_strdup(s2));
	len1 = ft_strlen(s1);
	len2 = ft_strlen(s2);
	result = (char *)malloc(sizeof(char) * (len1 + len2 + 1));
	if (!result)
		return (NULL);
	ft_strlcpy(result, s1, len1 + 1);
	ft_strlcat(result, s2, len1 + len2 + 1);
	return (result);
}
/*
#include <stdio.h>

int	main(void)
{
	char *s1 = "Hello";
	char *s2 = " World";
	char *result;

	result = ft_strjoin(s1, s2);
	printf("%s\n", result);
	free(result);
	return (0);
} */