ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: yxu <yxu@student.42tokyo.jp>               +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/08/21 13:56:56 by yxu               #+#    #+#             */
/*   Updated: 2023/10/01 19:57:38 by yxu              ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*str;
	char	*start;

	if (s1 == NULL || s2 == NULL)
		return (NULL);
	str = (char *)malloc(ft_strlen((char *)s1) + ft_strlen((char *)s2) + 1);
	start = str;
	if (str == NULL)
		return (NULL);
	while (*s1 != '\0')
		*str++ = *s1++;
	while (*s2 != '\0')
		*str++ = *s2++;
	*str = '\0';
	return (start);
}