42_libft/ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/29 11:20:27 by cchauvet          #+#    #+#             */
/*   Updated: 2022/09/29 11:30:50 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strjoin(const char *s1, const char *s2)
{
	char	*out;
	ssize_t	i;
	ssize_t	j;
	size_t	len_s1;
	size_t	len_s2;

	if (s1 == NULL || s2 == NULL)
		return (NULL);
	len_s1 = ft_strlen(s1);
	len_s2 = ft_strlen(s2);
	out = malloc(sizeof(char) * (len_s1 + len_s2 + 1));
	if (out == NULL)
		return (NULL);
	i = -1;
	while (++i < (ssize_t) len_s1)
		out[i] = s1[i];
	j = -1;
	while (++j < (ssize_t) len_s2)
		out[j + i] = s2[j];
	out[i + j] = 0;
	return (out);
}