ft_strlcat.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strlcat.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ykoh <ykoh@student.42seoul.kr>             +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/03/17 22:37:45 by ykoh              #+#    #+#             */
/*   Updated: 2020/10/05 23:48:24 by ykoh             ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

size_t	ft_strlcat(char *dst, const char *src, size_t dstsize)
{
	const size_t srclen = ft_strlen(src);
	const size_t dstlen = ft_strnlen(dst, dstsize);

	if (dstsize == dstlen)
		return (dstlen + srclen);
	if (dstlen + srclen < dstsize)
		ft_memcpy(dst + dstlen, src, srclen + 1);
	else
	{
		ft_memcpy(dst + dstlen, src, dstsize - dstlen - 1);
		dst[dstsize - 1] = '\0';
	}
	return (dstlen + srclen);
}