/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   readall.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kdx    <kdx   @student.42angouleme.fr      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/10 07:51:08 by kdx               #+#    #+#             */
/*   Updated: 2022/10/10 08:07:42 by kdx              ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft/libft.h"
#include "readall.h"
#include <unistd.h>

/* always free src */
static char	*realloc_buf(char *src, size_t size)
{
	char	*cpy;
	size_t	i;

	cpy = ft_calloc((size + 1) * READALL_BSIZE, sizeof(char));
	if (cpy == NULL)
		return (ft_free(src));
	i = -1;
	while (++i < size * READALL_BSIZE)
		cpy[i] = src[i];
	ft_free(src);
	return (cpy);
}

char	*readall(int fd)
{
	char	*buf;
	int		read_rv;
	size_t	read_cnt;

	buf = realloc_buf(NULL, 0);
	if (buf == NULL)
		return (NULL);
	read_cnt = 0;
	read_rv = 1;
	while (read_rv && buf != NULL)
	{
		read_rv = read(fd, buf + read_cnt * READALL_BSIZE, READALL_BSIZE);
		read_cnt++;
		if (read_rv < 0)
			return (ft_free(buf));
		else
			buf = realloc_buf(buf, read_cnt);
		if (read_rv != READALL_BSIZE)
			return (buf);
	}
	return (buf);
}