ft_strjoin_ff.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin_ff.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rgaia <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/12/08 18:28:07 by rgaia             #+#    #+#             */
/*   Updated: 2017/12/08 18:29:45 by rgaia            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/*
** Joins both arguments, returning a fresh allocated joined string.
** EXTRA: 'ff' = frees first string before returning
*/

char	*ft_strjoin_ff(char *s1, char const *s2)
{
	char *str;

	if (s1 == NULL || s2 == NULL)
		return (NULL);
	str = ft_strnew(ft_strlen(s1) + ft_strlen(s2));
	if (str == NULL)
		return (NULL);
	str = ft_strcpy(str, s1);
	str = ft_strcat(str, s2);
	ft_strdel(&s1);
	return (str);
}