nntp_stream.c
3.48 KB
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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003-2004, 2007, 2010-2012, 2014-2015 Free Software
Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <mailutils/sys/nntp.h>
/* Implementation of the stream for HELP, ARTICLE, etc ... */
struct mu_nntp_stream
{
mu_nntp_t nntp;
int done;
};
static void
mu_nntp_stream_destroy (mu_stream_t stream)
{
struct mu_nntp_stream *nntp_stream = mu_stream_get_owner (stream);
if (nntp_stream)
{
free (nntp_stream);
}
}
static int
mu_nntp_stream_read (mu_stream_t stream, char *buf, size_t buflen, mu_off_t offset, size_t *pn)
{
struct mu_nntp_stream *nntp_stream = mu_stream_get_owner (stream);
size_t n = 0;
int status = 0;
char *p = buf;
(void)offset;
if (nntp_stream)
{
if (!nntp_stream->done)
{
do
{
size_t nread = 0;
/* The nntp_readline () function will always read one less to
be able to null terminate the buffer, this will cause
serious grief for mu_stream_read() where it is legitimate to
have a buffer of 1 char. So we must catch it here. */
if (buflen == 1)
{
char buffer[2];
*buffer = '\0';
status = mu_nntp_readline (nntp_stream->nntp, buffer, 2, &nread);
*p = *buffer;
}
else
status = mu_nntp_readline (nntp_stream->nntp, p, buflen, &nread);
if (status != 0)
break;
if (nread == 0)
{
nntp_stream->nntp->state = MU_NNTP_NO_STATE;
nntp_stream->done = 1;
break;
}
n += nread;
buflen -= nread;
p += nread;
}
while (buflen > 0);
}
}
if (pn)
*pn = n;
return status;
}
static int
mu_nntp_stream_readline (mu_stream_t stream, char *buf, size_t buflen, mu_off_t offset, size_t *pn)
{
struct mu_nntp_stream *nntp_stream = mu_stream_get_owner (stream);
size_t n = 0;
int status = 0;
(void)offset;
if (nntp_stream)
{
if (!nntp_stream->done)
{
status = mu_nntp_readline (nntp_stream->nntp, buf, buflen, &n);
if (n == 0)
{
nntp_stream->nntp->state = MU_NNTP_NO_STATE;
nntp_stream->done = 1;
}
}
}
if (pn)
*pn = n;
return status;
}
int
mu_nntp_stream_create (mu_nntp_t nntp, mu_stream_t *pstream)
{
struct mu_nntp_stream *nntp_stream;
int status;
nntp_stream = malloc (sizeof *nntp_stream);
if (nntp_stream == NULL)
return ENOMEM;
nntp_stream->nntp = nntp;
nntp_stream->done = 0;
status = mu_stream_create (pstream, MU_STREAM_READ, nntp_stream);
if (status != 0)
{
free (nntp_stream);
return status;
}
mu_stream_set_read (*pstream, mu_nntp_stream_read, nntp_stream);
mu_stream_set_readline (*pstream, mu_nntp_stream_readline, nntp_stream);
mu_stream_set_destroy (*pstream, mu_nntp_stream_destroy, nntp_stream);
return 0;
}