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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/08 10:37:41 by cacharle #+# #+# */
/* Updated: 2019/10/11 14:29:11 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 buf[BUFFER_SIZE + 1];
static char *rest = NULL;
if (fd < 0 || line == NULL)
return (ERROR);
while ((ret = read(fd, buf, BUFFER_SIZE)) > 0 || !empty_rest(rest))
{
buf[ret] = 0;
rest = ft_strappend(rest, buf);
if ((split_at = find_newline(rest)) == -1 && ret == 0)
split_at = ft_strlen(rest);
if (split_at == -1)
continue ;
if ((*line = (char*)malloc(sizeof(char) * (split_at + 1))) == NULL)
return (ERROR);
ft_strncpy(*line, rest, split_at);
(*line)[split_at] = '\0';
return ((rest = shift_rest(rest, split_at)) == NULL
? ERROR : LINE_READ);
}
free(rest);
rest = NULL;
return (ret == -1 ? ERROR : END_OF_FILE);
}
char *shift_rest(char *rest, int split_at)
{
char *copy;
int len;
len = ft_strlen(rest) - split_at + 1;
if ((copy = (char*)malloc(sizeof(char) * len)) == NULL)
return (NULL);
ft_strncpy(copy, rest + split_at + 1, len);
free(rest);
if ((rest = (char*)malloc(sizeof(char) * len)) == NULL)
return (NULL);
ft_strncpy(rest, copy, len);
free(copy);
return (rest);
}
int find_newline(char *str)
{
int i;
i = -1;
while (str[++i])
if (str[i] == '\n')
return (i);
return (-1);
}
t_bool empty_rest(char *rest)
{
if (rest == NULL)
return (TRUE);
if (rest[0] == 0)
return (TRUE);
return (FALSE);
}
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