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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/19 09:08:36 by cacharle #+# #+# */
/* Updated: 2019/11/03 00:18:57 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
*/
#define HAS_NEWLINE(str, split_at) ((split_at = find_newline(str)) != -1)
#define HAS_NO_NEWLINE(str, split_at) ((split_at = find_newline(str)) == -1)
int get_next_line(int fd, char **line)
{
int split_at;
static char *rest[OPEN_MAX] = {NULL};
if (fd < 0 || fd > OPEN_MAX || line == NULL || BUFFER_SIZE <= 0)
return (STATUS_ERROR);
*line = malloc(1);
(*line)[0] = 0;
if (rest[fd] == NULL || rest[fd][0] == 0)
return (read_line(fd, line, &rest[fd]));
if (HAS_NEWLINE(rest[fd], split_at))
{
if ((*line = (char*)malloc(sizeof(char) * (split_at + 1))) == NULL)
return (STATUS_ERROR);
ft_strncpy(*line, rest[fd], split_at);
(*line)[split_at] = '\0';
ft_strcpy(rest[fd], rest[fd] + split_at + 1);
return (STATUS_LINE);
}
if (!(*line = (char*)malloc(sizeof(char) * (ft_strlen(rest[fd]) + 1))))
return (STATUS_ERROR);
ft_strcpy(*line, rest[fd]);
free(rest[fd]);
rest[fd] = NULL;
return (read_line(fd, line, &rest[fd]));
}
int read_line(int fd, char **line, char **rest)
{
int ret;
int split_at;
char *buf;
if ((buf = malloc(sizeof(char) * (BUFFER_SIZE + 1))) == NULL)
return (STATUS_ERROR);
while ((ret = read(fd, buf, BUFFER_SIZE)) > 0)
{
buf[ret] = '\0';
if (HAS_NEWLINE(buf, split_at))
{
free(*rest);
*rest = ft_strdup(buf + split_at + 1);
buf[split_at] = '\0';
if ((*line = ft_strappend(*line, buf)) == NULL)
return (free_return(&buf, STATUS_ERROR));
return (free_return(&buf, STATUS_LINE));
}
if ((*line = ft_strappend(*line, buf)) == NULL)
return (free_return(&buf, STATUS_ERROR));
}
return (free_return(&buf, ret));
}
int find_newline(char *str)
{
int i;
i = -1;
while (str[++i])
if (str[i] == '\n')
return (i);
return (-1);
}
int free_return(char **ptr, int ret)
{
if (ptr == NULL)
return (ret);
free(*ptr);
*ptr = NULL;
return (ret);
}
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