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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/08 10:37:41 by cacharle #+# #+# */
/* Updated: 2019/10/10 16:37:31 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include "get_next_line.h"
/*
** store rest in local_buf and read diff
** while no newline -> recursion
** newline -> store what is after newline
** allocate line according to stack depth
** cpy before newline at the end
** at each stack pop store local buf on the allocated line
*/
int get_next_line(int fd, char **line)
{
int ret;
int split_at;
char local_buf[BUFFER_SIZE + 1];
static int line_len = 0;
static char rest_buf[BUFFER_SIZE + 1] = {0};
if (line == NULL)
return (ERROR);
local_buf[BUFFER_SIZE] = '\0';
if ((ret = read_after(fd, local_buf, rest_buf)) <= 0 && local_buf[0] == 0)
return (ret);
split_at = find_newline(local_buf);
if (split_at == -1 && ret < BUFFER_SIZE)
split_at = ft_strlen(local_buf);
if (split_at != -1)
{
ft_strncpy(rest_buf, local_buf + split_at + 1,
ft_strlen(local_buf) - split_at);
if ((*line = malloc(sizeof(char) * (line_len + split_at + 1))) == NULL)
return (ERROR);
ft_strncpy(*line + line_len, local_buf, split_at);
(*line)[line_len + split_at] = '\0';
return (LINE_READ);
}
line_len += BUFFER_SIZE;
if ((ret = get_next_line(fd, line)) == -1)
return (ERROR);
line_len -= BUFFER_SIZE;
ft_strncpy(*line + line_len, local_buf, BUFFER_SIZE);
return (ret);
}
int read_after(int fd, char *local_buf, char *rest_buf)
{
int offset;
int ret;
offset = ft_strlen(rest_buf);
ft_strncpy(local_buf, rest_buf, offset);
rest_buf[0] = '\0';
if ((ret = read(fd, local_buf + offset, BUFFER_SIZE - offset)) == -1)
return (ERROR);
local_buf[offset + ret] = '\0';
return (ret);
}
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