nntp_stream.c
3.47 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003, 2004, 2007, 2010, 2011 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;
}