ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: aalvarez <aalvarez@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/08/17 03:19:28 by aalvarez          #+#    #+#             */
/*   Updated: 2022/08/17 20:23:00 by aalvarez         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

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

/**
 * @brief concatenates the string pointed by s1 and the string pointed
 * by s2 and allocates a new string based on the result of the concatenation.
 * 
 * @param s1 the first string to concatenate.
 * @param s2 the second string to concatenate.
 * @return char* the allocated string resultant of the concatenation.
 */
char	*ft_strjoin(const char *s1, const char *s2)
{
	char	*str;

	if (!s1 || !s2)
		return (NULL);
	str = (char *)malloc(sizeof(char) * (ft_strlen(s1) + ft_strlen(s2) + 1));
	if (!str)
		return (NULL);
	ft_strlcpy(str, s1, (ft_strlen(s1) + 1));
	ft_strlcat(str, s2, (ft_strlen(s1) + ft_strlen(s2) + 1));
	return (str);
}