-
Notifications
You must be signed in to change notification settings - Fork 0
/
get_next_line.c
82 lines (75 loc) · 2.62 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
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: freddy <freddy@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/10/25 07:18:01 by fschuber #+# #+# */
/* Updated: 2023/11/06 14:45:07 by freddy ### ########.fr */
/* */
/* ************************************************************************** */
#include "get_next_line.h"
/*
@brief Reads one chunk from filedes & appends it to left; \n
@brief The return value of read gets written into read_ret; \n
@returns -1 on failure, 0 on EOF, 1 on success; \n
*/
int get_next_chunk(char **left, int filedes, int *read_ret)
{
char *temp;
char *buffer;
buffer = malloc((BUFFER_SIZE * sizeof(char)) + 1);
if (!buffer)
return (-1);
*read_ret = read(filedes, buffer, BUFFER_SIZE);
if (*read_ret <= 0)
return (free (buffer), *read_ret);
buffer[*read_ret] = '\0';
temp = *left;
*left = gnl_strjoin(temp, buffer);
free (buffer);
free (temp);
if (!*left)
return (-1);
return (1);
}
/*
@brief Returns a full line & removes it from left;
*/
char *split_off_line(char **left, int split_i)
{
char *temp_left;
char *temp_return;
temp_return = gnl_substr(*left, 0, split_i);
temp_left = gnl_substr(*left, split_i, gnl_strlen(*left) - split_i);
free(*left);
*left = temp_left;
return (temp_return);
}
/*
@returns Line by line of filedes content on subsequent function calls;
@brief left: chars read but not returned in last function call; \n
@brief read_ret: return value of read call;
*/
char *get_next_line(int filedes)
{
static char *left;
int read_ret;
if (filedes < 0)
return (free(left), left = NULL, NULL);
read_ret = 1;
while (gnl_strchr(left, '\n') < 0 && read_ret > 0)
if (get_next_chunk(&left, filedes, &read_ret) == -1)
return (free (left), left = NULL, NULL);
if (gnl_strlen(left) > 0)
{
if (gnl_strchr(left, '\n') == -2)
return (split_off_line(&left, gnl_strlen(left)));
else
return (split_off_line(&left, gnl_strchr(left, '\n') + 1));
}
if (gnl_strlen(left) == 0 && read_ret == 0)
return (free (left), left = NULL, NULL);
return (free(left), left = NULL, NULL);
}