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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/19 09:08:36 by cacharle #+# #+# */
/* Updated: 2019/10/27 23:22:33 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include "get_next_line.h"
/*
** if has rest:
** if rest has newline:
** push rest until newline in line, shift rest
** return LINE_READ
** else:
** push rest in line
**
** while can read fd in buf
** if buf has newline:
** push buf until newline in line
** push buf after newline in rest
** return LINE_READ
** push buf in line
**
** return GNL_EOF
*/
int real_get_next_line(int fd, char **line, int ret, int counter)
{
int split_at;
t_bool had_rest;
char buf[BUFFER_SIZE + 1];
static char rest[OPEN_MAX][BUFFER_SIZE + 1] = {{0}};
if ((had_rest = put_rest(line, rest[fd])) == -1 || had_rest == -2)
return (had_rest == -1 ? LINE_READ : ERROR);
while (rest[fd][0] == '\0' && (ret = read(fd, buf, BUFFER_SIZE)) > 0)
{
counter++;
buf[ret] = '\0';
if ((split_at = find_newline(buf)) != -1)
{
ft_strncpy(rest[fd], buf + split_at + 1, BUFFER_SIZE);
buf[split_at] = '\0';
*line = ft_strappend(*line, buf);
return (*line == NULL ? ERROR : LINE_READ);
}
if ((*line = ft_strappend(*line, buf)) == NULL)
return (ERROR);
}
if (ret == -1)
return (clean_line(line, ERROR));
return (had_rest || counter != 0 ? LINE_READ : clean_line(line, GNL_EOF));
}
int get_next_line(int fd, char **line)
{
int ret;
int counter;
ret = 0;
counter = 0;
if (fd < 0 || fd > OPEN_MAX || line == NULL || BUFFER_SIZE < 0)
return (ERROR);
if (BUFFER_SIZE == 0)
{
*line = NULL;
return (LINE_READ);
}
return (real_get_next_line(fd, line, ret, counter));
}
int put_rest(char **line, char *rest)
{
int split_at;
t_bool had_rest;
had_rest = rest[0] != '\0';
if ((split_at = find_newline(rest)) == -1)
{
if ((*line = malloc(sizeof(char) * (ft_strlen(rest) + 1))) == NULL)
return (-2);
ft_strcpy(*line, rest);
rest[0] = '\0';
return (had_rest);
}
if (split_at + 1 == ft_strlen(rest))
had_rest = -1;
if ((*line = malloc(sizeof(char) * (split_at + 1))) == NULL)
return (-2);
ft_strncpy(*line, rest, split_at);
(*line)[split_at] = '\0';
ft_strncpy(rest, rest + split_at + 1, BUFFER_SIZE);
return (had_rest);
}
int find_newline(char *str)
{
int i;
i = -1;
while (str[++i])
if (str[i] == '\n')
return (i);
return (-1);
}
int clean_line(char **line, int ret)
{
free(*line);
*line = NULL;
return (ret);
}
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