-
Notifications
You must be signed in to change notification settings - Fork 0
/
get_next_line.c
106 lines (95 loc) · 2.38 KB
/
get_next_line.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mpeanuts <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/11/19 20:57:43 by mpeanuts #+# #+# */
/* Updated: 2021/11/19 20:57:44 by mpeanuts ### ########.fr */
/* */
/* ************************************************************************** */
#include "get_next_line.h"
static size_t len_before_nl(char *buf)
{
size_t count;
count = 0;
while (*buf != '\n')
{
count++;
buf++;
}
return (count);
}
static char *truncate_line(char **fd_buf)
{
char *line;
char *tmp;
size_t len;
len = len_before_nl(*fd_buf);
line = ft_substr(*fd_buf, 0, len + 1);
tmp = ft_strdup(&(*fd_buf)[len + 1]);
if (!tmp)
return (NULL);
free(*fd_buf);
if (tmp[0] == '\0')
{
free(tmp);
*fd_buf = NULL;
}
else
*fd_buf = tmp;
return (line);
}
static char *return_and_truncate(char **fd_buf)
{
char *line;
if (ft_strchr(*fd_buf, '\n'))
line = truncate_line(fd_buf);
else
{
line = ft_strdup(*fd_buf);
if (!line)
return (NULL);
free (*fd_buf);
*fd_buf = NULL;
}
return (line);
}
static char *save(char *buf, char **fd_buf)
{
char *tmp;
if (!*fd_buf)
*fd_buf = ft_strdup(buf);
else
{
tmp = ft_strjoin(*fd_buf, buf);
free(*fd_buf);
*fd_buf = tmp;
}
return (*fd_buf);
}
char *get_next_line(int fd)
{
static char *fd_buf[MAX_FD];
int count_read;
char buf[BUFFER_SIZE + 1];
count_read = 1;
if (fd < 0 || fd > MAX_FD || read(fd, 0, 0) < 0)
return (NULL);
if (fd_buf[fd])
if (ft_strchr(fd_buf[fd], '\n'))
return (return_and_truncate(&fd_buf[fd]));
while (count_read > 0)
{
count_read = read(fd, buf, BUFFER_SIZE);
if (count_read < 1 && !fd_buf[fd])
return (NULL);
buf[count_read] = '\0';
if (!save(buf, &fd_buf[fd]))
return (NULL);
if (ft_strchr(fd_buf[fd], '\n'))
break ;
}
return (return_and_truncate(&fd_buf[fd]));
}