libft/ft_strjoin.c at main · Mouad-El-Asri/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: moel-asr <moel-asr@student.1337.ma>        +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/07 15:41:05 by moel-asr          #+#    #+#             */
/*   Updated: 2022/10/18 16:07:18 by moel-asr         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strjoin(char const *s1, char const *s2)
{
	size_t	s1_len;
	size_t	s2_len;
	size_t	total_len;
	char	*str;

	if (!s1 && !s2)
		return (ft_strdup(""));
	if (!s1 && s2)
		return (ft_strdup(s2));
	if (!s2 && s1)
		return (ft_strdup(s1));
	s1_len = ft_strlen(s1);
	s2_len = ft_strlen(s2);
	total_len = s1_len + s2_len + 1;
	str = (char *)malloc(total_len * sizeof(char));
	if (!str)
		return (NULL);
	ft_memmove(str, s1, s1_len);
	ft_memmove(str + s1_len, s2, s2_len);
	str[total_len - 1] = '\0';
	return (str);
}