/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line_utils.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/17 16:43:37 by thrieg            #+#    #+#             */
/*   Updated: 2025/02/16 19:06:55 by thrieg           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"
#include "../libft.h"

//allocates and returns a new t_list node, setting next as NULL, allocates 
//BUFFER_SIZE bytes for the buffer. returns NULL if any allocation fails
//index is set to BUFFER_SIZE and nb_chars to 0
t_gnl_list	*ft_gnl_create_bufflist(int fd)
{
	t_gnl_list	*list;

	list = malloc(sizeof(t_gnl_list));
	if (!list)
		return (NULL);
	list->buffer = malloc(sizeof(char) * BUFFER_SIZE);
	if (!list->buffer)
		return (free(list), NULL);
	list->fd = fd;
	list->index = BUFFER_SIZE;
	list->nb_chars = 0;
	list->next = NULL;
	return (list);
}

t_gnl_vector	*ft_gnl_create_vector(size_t size)
{
	t_gnl_vector	*ret;

	ret = malloc(sizeof(t_gnl_vector));
	if (!ret)
		return (NULL);
	ret->buffer = malloc(sizeof(char) * size);
	if (!ret->buffer)
	{
		free(ret);
		return (NULL);
	}
	ret->index = 0;
	ret->size = size;
	ret->finished = 0;
	return (ret);
}

//append size bytes at src to the vector dest
//returns NULL if the allocation fail or dest otherwise
t_gnl_vector	*ft_gnl_vector_concat(
t_gnl_vector *dest,
void *src,
size_t size)
{
	char	*buff;

	if (!dest || !src)
		return (NULL);
	if ((dest->index + size) >= dest->size)
	{
		buff = malloc(sizeof(char) * ((dest->size + size) * 2));
		if (!buff)
			return (NULL);
		ft_memcpy(buff, dest->buffer, dest->index);
		dest->size = (dest->size + size) * 2;
		free(dest->buffer);
		dest->buffer = buff;
	}
	ft_memcpy(dest->buffer + dest->index, src, size);
	dest->index += size;
	return (dest);
}

//duplicates the content of a vector into an appropriately sized string
//returns NULL if allocation fails or vec is NULL, or vec->buffer is NULL
char	*ft_gnl_vtoc(t_gnl_vector *vec)
{
	char	*ret;

	if (!vec)
		return (NULL);
	if (!vec->buffer)
		return (NULL);
	ret = malloc(sizeof(char) * (vec->index + 1));
	if (!ret)
		return (NULL);
	ft_memcpy(ret, vec->buffer, vec->index);
	ret[vec->index] = '\0';
	return (ret);
}