ft_strlcat.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strlcat.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jowagner <jowagner@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/12 14:02:38 by jowagner          #+#    #+#             */
/*   Updated: 2024/12/12 19:49:57 by jowagner         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/**
 * @brief Appends src to dst, ensuring NULL-termination and
 * not exceeding size bytes in dst.
 *
 * @param dst Pointer to the destination buffer.
 * @param src Pointer to the source string to append.
 * @param size Size of the destination buffer.
 * @return The total length of the string it tried to create
 * (initial length of dst plus length of src).
 */
size_t	ft_strlcat(char *dest, const char *src, size_t size)
{
	size_t	dest_len;
	size_t	src_len;
	size_t	i;

	dest_len = 0;
	while (dest_len < size && dest[dest_len])
		dest_len++;
	src_len = ft_strlen(src);
	if (dest_len == size)
		return (size + src_len);
	i = 0;
	while (dest_len + i + 1 < size && src[i])
	{
		dest[dest_len + i] = src[i];
		i++;
	}
	dest[dest_len + i] = '\0';
	return (dest_len + src_len);
}