ft_strlcat.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strlcat.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: maaugust <maaugust@student.42porto.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/04/09 18:09:05 by maaugust          #+#    #+#             */
/*   Updated: 2026/03/19 15:41:07 by maaugust         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/**
 * @fn size_t ft_strlcat(char *dst, const char *src, size_t size)
 * @brief Size-bounded string concatenation.
 * @details Appends string src to the end of dst. It will append at most 
 * size - strlen(dst) - 1 characters. It will then NUL-terminate, unless 
 * size is 0 or the original dst string was longer than size.
 * @param dst  Destination buffer.
 * @param src  Source string.
 * @param size Size of the destination buffer.
 * @return     The total length of the string it tried to create.
 */
size_t	ft_strlcat(char *dst, const char *src, size_t size)
{
	size_t	dst_len;
	size_t	src_len;
	size_t	i;
	size_t	j;

	src_len = ft_strlen(src);
	if (!dst && size == 0)
		return (src_len);
	dst_len = ft_strlen(dst);
	if (size <= dst_len)
		return (size + src_len);
	i = dst_len;
	j = 0;
	while (src[j] && (i + 1) < size)
	{
		dst[i] = src[j];
		i++;
		j++;
	}
	dst[i] = '\0';
	return (dst_len + src_len);
}