pop3_stream.c
3.68 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003, 2007, 2010 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, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <mailutils/sys/pop3.h>
/* Implementation of the stream for TOP and RETR. */
struct mu_pop3_stream
{
mu_pop3_t pop3;
int done;
};
static void
mu_pop3_stream_destroy (mu_stream_t stream)
{
struct mu_pop3_stream *pop3_stream = mu_stream_get_owner (stream);
if (pop3_stream)
{
free (pop3_stream);
}
}
static int
mu_pop3_stream_read (mu_stream_t stream, char *buf, size_t buflen, mu_off_t offset, size_t *pn)
{
struct mu_pop3_stream *pop3_stream = mu_stream_get_owner (stream);
size_t n = 0;
int status = 0;
char *p = buf;
(void)offset;
if (pop3_stream)
{
if (!pop3_stream->done)
{
do
{
size_t nread = 0;
/* The pop3_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_pop3_readline (pop3_stream->pop3, buffer, 2, &nread);
*p = *buffer;
}
else
status = mu_pop3_readline (pop3_stream->pop3, p, buflen, &nread);
if (status != 0)
break;
if (nread == 0)
{
pop3_stream->pop3->state = MU_POP3_NO_STATE;
pop3_stream->done = 1;
break;
}
n += nread;
buflen -= nread;
p += nread;
}
while (buflen > 0);
}
}
if (pn)
*pn = n;
return status;
}
static int
mu_pop3_stream_readline (mu_stream_t stream, char *buf, size_t buflen, mu_off_t offset, size_t *pn)
{
struct mu_pop3_stream *pop3_stream = mu_stream_get_owner (stream);
size_t n = 0;
int status = 0;
(void)offset;
if (pop3_stream)
{
if (!pop3_stream->done)
{
status = mu_pop3_readline (pop3_stream->pop3, buf, buflen, &n);
if (n == 0)
{
pop3_stream->pop3->state = MU_POP3_NO_STATE;
pop3_stream->done = 1;
}
}
}
if (pn)
*pn = n;
return status;
}
int
mu_pop3_stream_create (mu_pop3_t pop3, mu_stream_t *pstream)
{
struct mu_pop3_stream *pop3_stream;
int status;
pop3_stream = malloc (sizeof *pop3_stream);
if (pop3_stream == NULL)
return ENOMEM;
pop3_stream->pop3 = pop3;
pop3_stream->done = 0;
status = mu_stream_create (pstream, MU_STREAM_READ | MU_STREAM_NO_CLOSE | MU_STREAM_NO_CHECK, pop3_stream);
if (status != 0)
{
free (pop3_stream);
return status;
}
mu_stream_set_read (*pstream, mu_pop3_stream_read, pop3_stream);
mu_stream_set_readline (*pstream, mu_pop3_stream_readline, pop3_stream);
mu_stream_set_destroy (*pstream, mu_pop3_stream_destroy, pop3_stream);
return 0;
}