get_next_line/get_next_line.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/23 20:32:46 by kcolin            #+#    #+#             */
/*   Updated: 2024/11/06 17:33:37 by kcolin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"
#include <stdlib.h>

/*
static int num_allocs = 0;

static void *xmalloc(size_t size)
{
    if (FAIL_AFTER > 0 && num_allocs++ >= FAIL_AFTER)
    {
        return 0;
    }
    return malloc(size);
}

#define malloc(x) xmalloc(x)
*/

char	*read_at_least_one_line(char *buffer, int fd)
{
	char	*read_buffer;
	int		bytes_read;

	read_buffer = malloc((BUFFER_SIZE + 1 ) * sizeof(char));
	if (read_buffer == NULL)
		return (NULL);
	bytes_read = 1;
	while (!ft_strchr(buffer, '\n') && bytes_read > 0)
	{
		bytes_read = read(fd, read_buffer, BUFFER_SIZE);
		if (bytes_read < 0)
		{
			free(buffer);
			free(read_buffer);
			return (NULL);
		}
		read_buffer[bytes_read] = '\0';
		buffer = ft_strjoin(buffer, read_buffer);
	}
	free(read_buffer);
	return (buffer);
}

#include <stdio.h>

char	*get_next_line(int fd)
{
	static char	*buffer = NULL;
	char		*out;
	size_t		line_length;

	if (fd < 0)
		return (NULL);
	buffer = read_at_least_one_line(buffer, fd);
	if (buffer == NULL)
		return (NULL);
	line_length = 0;
	while (buffer[line_length] != '\0' || buffer[line_length] != '\n')
		line_length++;
	out = ft_substr(buffer, 0, line_length + 1);
	buffer = ft_substr(buffer, line_length, ft_strlen(buffer) - line_length);
	return (out);
}