ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: vbrazas <vbrazas@student.unit.ua>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/11/05 20:50:12 by vbrazas           #+#    #+#             */
/*   Updated: 2018/12/09 04:48:57 by vbrazas          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*buf;
	size_t	i;
	size_t	j;

	if (s1 == NULL && s2 == NULL)
		return (NULL);
	else if (!s1)
		return (ft_strdup(s2));
	else if (!s2)
		return (ft_strdup(s1));
	buf = (char *)malloc(sizeof(*buf) * (ft_strlen(s1) + ft_strlen(s2) + 1));
	if (buf == NULL)
		return (NULL);
	i = 0;
	j = 0;
	while (s1[j])
		buf[i++] = s1[j++];
	j = 0;
	while (s2[j])
		buf[i++] = s2[j++];
	buf[i] = '\0';
	return (buf);
}