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get_next_line.c
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get_next_line.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: vlytvyne <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2018/10/29 13:37:42 by vlytvyne #+# #+# */
/* Updated: 2018/10/29 13:37:43 by vlytvyne ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include "libft.h"
#include "get_next_line.h"
static t_give_status nl_is_not_found(char **st_buff, char **line)
{
int size;
size = ft_strlen(*st_buff) + 1;
if (size <= 1)
{
*line = NULL;
return (NOTHING_TO_GIVE);
}
if (!(*line = (char*)malloc(size)))
return (ERROR);
ft_strncpy(*line, *st_buff, size - 1);
(*line)[size - 1] = '\0';
ft_strdel(st_buff);
return (LINE_IS_GIVEN);
}
static t_give_status give_line(char **st_buff, char **line, int is_end_file)
{
char *start;
int size;
if (!(start = ft_strchr(*st_buff, '\n')))
{
if (is_end_file)
return (nl_is_not_found(st_buff, line));
return (NOTHING_TO_GIVE);
}
start++;
size = start - (*st_buff);
if (!(*line = (char*)malloc(size)))
return (ERROR);
ft_strncpy(*line, *st_buff, size - 1);
(*line)[size - 1] = '\0';
start = ft_strdup(start);
ft_strdel(st_buff);
*st_buff = start;
return (LINE_IS_GIVEN);
}
static char **get_appropriate_buff(int fd, t_fd_record *records)
{
int i;
i = 0;
while (records[i].buff)
{
if (records[i].fd == fd)
return (&records[i].buff);
i++;
}
records[i].fd = fd;
records[i].buff = ft_strnew(0);
return (&records[i].buff);
}
static void perform_join(char **cur_buff, char *buff)
{
char *to_free;
to_free = *cur_buff;
*cur_buff = ft_strjoin(*cur_buff, (char*)buff);
ft_strdel(&to_free);
}
int get_next_line(const int fd, char **line)
{
char buff[BUFF_SIZE + 1];
char **cur_buff;
int read_ret;
t_give_status give_status;
static t_fd_record records[SUPPORTED_THREADS];
if (fd < 0 || line == NULL)
return (ERROR);
cur_buff = get_appropriate_buff(fd, records);
while (1)
{
read_ret = read(fd, buff, BUFF_SIZE);
if (read_ret == -1)
return (ERROR);
if (read_ret == 0)
{
give_status = give_line(cur_buff, line, 1);
return (give_status);
}
buff[read_ret] = '\0';
perform_join(cur_buff, buff);
give_status = give_line(cur_buff, line, 0);
if (give_status != NOTHING_TO_GIVE)
return (give_status);
}
}