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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: ggane <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2016/05/05 10:20:54 by ggane #+# #+# */
/* Updated: 2016/12/27 12:39:51 by ggane ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static char *fill_stock(int fd, char *stock)
{
char buf[BUFF_SIZE + 1];
char *del;
int ret;
ft_bzero(buf, BUFF_SIZE + 1);
while (!ft_strchr(buf, '\n'))
{
if ((ret = read(fd, buf, BUFF_SIZE)) == -1)
return (NULL);
buf[ret] = '\0';
del = stock;
stock = ft_strjoin(stock, buf);
ft_memdel((void **)&del);
if (ret == 0 && ft_strlen(buf) == 0)
break ;
}
ft_strclr((char *)buf);
return (stock);
}
static char *cut_previous_content(char *str, char *prev)
{
char *del;
del = str;
str = ft_strsub(str, ft_strlen(prev) + 1, ft_strlen(str) - ft_strlen(prev));
ft_strdel(&del);
return (str);
}
static size_t size_till_next_newline(char *str)
{
size_t size;
size = 0;
while (str[size] != '\n' && str[size] != '\0')
size++;
return (size);
}
static char *until_newline(char *str)
{
size_t size;
char *before;
size = size_till_next_newline(str);
before = ft_strsub(str, 0, size);
return (before);
}
int get_next_line(const int fd, char **line)
{
static t_cell gnl;
char *prev;
if (fd < 0 || BUFF_SIZE < 0 || line == NULL)
return (-1);
if (gnl.prev_fd != fd)
{
ft_memdel((void **)&gnl.stock);
gnl.prev_fd = fd;
}
if (!gnl.stock)
gnl.stock = ft_strnew(0);
if ((gnl.stock = fill_stock(fd, gnl.stock)) == NULL)
return (-1);
prev = until_newline(gnl.stock);
*line = ft_strdup(prev);
if (ft_strlen(gnl.stock) == 0 && ft_strlen(prev) == 0)
{
ft_strdel(&prev);
ft_strdel(&gnl.stock);
return (0);
}
gnl.stock = cut_previous_content(gnl.stock, prev);
ft_strdel(&prev);
return (1);
}