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
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/19 09:08:36 by cacharle #+# #+# */
/* Updated: 2019/11/04 00:00:16 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include "libft.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)
int get_next_line(int fd, char **line)
{
int split_at;
static char rest[OPEN_MAX][BUFFER_SIZE + 1] = {{0}};
if (fd < 0 || fd > OPEN_MAX || line == NULL || BUFFER_SIZE <= 0)
return (STATUS_ERROR);
if ((*line = ft_strdup("")) == NULL)
return (STATUS_ERROR);
if (rest[fd][0] == '\0')
return (read_line(fd, line, rest[fd]));
if (HAS_NEWLINE(rest[fd], split_at))
{
free(*line);
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);
}
free(*line);
if (!(*line = (char*)malloc(sizeof(char) * (ft_strlen(rest[fd]) + 1))))
return (STATUS_ERROR);
ft_strcpy(*line, rest[fd]);
rest[fd][0] = '\0';
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 (free_return(line, NULL, STATUS_ERROR));
while ((ret = read(fd, buf, BUFFER_SIZE)) > 0)
{
buf[ret] = '\0';
if (HAS_NEWLINE(buf, split_at))
{
ft_strcpy(rest, buf + split_at + 1);
buf[split_at] = '\0';
if ((*line = ft_strjoin_free(*line, buf, 1)) == NULL)
return (free_return(&buf, NULL, STATUS_ERROR));
return (free_return(&buf, NULL, STATUS_LINE));
}
if ((*line = ft_strjoin_free(*line, buf, 1)) == NULL)
return (free_return(&buf, NULL, STATUS_ERROR));
}
if (ret == -1)
return (free_return(&buf, line, STATUS_ERROR));
return (free_return(&buf, NULL, 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, char **ptr2, int ret)
{
if (ptr != NULL)
{
free(*ptr);
*ptr = NULL;
}
if (ptr2 != NULL)
{
free(*ptr2);
*ptr2 = NULL;
}
return (ret);
}
|
