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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010-2025 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, 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <mailutils/types.h>
#include <mailutils/alloc.h>
#include <mailutils/errno.h>
#include <mailutils/nls.h>
#include <mailutils/stream.h>
#include <mailutils/sys/stream.h>
#include <mailutils/sys/iostream.h>
static int
_iostream_read (struct _mu_stream *str, char *buf, size_t bufsize,
size_t *pnread)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc = mu_stream_read (sp->transport[_MU_STREAM_INPUT], buf, bufsize,
pnread);
if (rc)
sp->last_err_str = _MU_STREAM_INPUT;
return rc;
}
static int
_iostream_write (struct _mu_stream *str, const char *buf, size_t bufsize,
size_t *pnwrite)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc = mu_stream_write (sp->transport[_MU_STREAM_OUTPUT], buf, bufsize,
pnwrite);
if (rc)
sp->last_err_str = _MU_STREAM_OUTPUT;
return rc;
}
static int
_iostream_flush (struct _mu_stream *str)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc = mu_stream_flush (sp->transport[_MU_STREAM_INPUT]);
if (rc)
{
sp->last_err_str = _MU_STREAM_INPUT;
return rc;
}
if (sp->transport[_MU_STREAM_INPUT] != sp->transport[_MU_STREAM_OUTPUT])
{
rc = mu_stream_flush (sp->transport[_MU_STREAM_OUTPUT]);
if (rc)
sp->last_err_str = _MU_STREAM_OUTPUT;
}
return rc;
}
static int
_iostream_open (struct _mu_stream *str)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc;
rc = mu_stream_open (sp->transport[_MU_STREAM_INPUT]);
if (rc)
{
sp->last_err_str = _MU_STREAM_INPUT;
return rc;
}
if (sp->transport[_MU_STREAM_INPUT] != sp->transport[_MU_STREAM_OUTPUT])
{
rc = mu_stream_open (sp->transport[_MU_STREAM_OUTPUT]);
if (rc)
{
sp->last_err_str = _MU_STREAM_OUTPUT;
mu_stream_close (sp->transport[_MU_STREAM_INPUT]);
}
}
return rc;
}
static int
_iostream_close (struct _mu_stream *str)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
mu_stream_close (sp->transport[_MU_STREAM_INPUT]);
mu_stream_close (sp->transport[_MU_STREAM_OUTPUT]);
return 0;
}
static void
_iostream_done (struct _mu_stream *str)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
mu_stream_unref (sp->transport[_MU_STREAM_INPUT]);
mu_stream_unref (sp->transport[_MU_STREAM_OUTPUT]);
}
static int
_iostream_get_substream (struct _mu_iostream *sp, mu_stream_t *pstr)
{
mu_stream_t tmp[2], instream;
int status;
status = mu_stream_ioctl (sp->transport[MU_TRANSPORT_INPUT],
MU_IOCTL_SUBSTREAM, MU_IOCTL_OP_GET, tmp);
if (status == ENOSYS)
{
instream = sp->transport[MU_TRANSPORT_INPUT];
mu_stream_ref (instream);
status = 0;
}
else if (status == 0)
{
mu_stream_unref (tmp[MU_TRANSPORT_OUTPUT]);
instream = tmp[MU_TRANSPORT_INPUT];
}
if (status == 0)
{
status = mu_stream_ioctl (sp->transport[MU_TRANSPORT_OUTPUT],
MU_IOCTL_SUBSTREAM, MU_IOCTL_OP_GET, tmp);
if (status == 0)
{
mu_stream_unref (tmp[MU_TRANSPORT_INPUT]);
pstr[MU_TRANSPORT_INPUT] = instream;
pstr[MU_TRANSPORT_OUTPUT] = tmp[MU_TRANSPORT_OUTPUT];
}
else if (status == ENOSYS)
{
pstr[MU_TRANSPORT_INPUT] = instream;
pstr[MU_TRANSPORT_OUTPUT] = sp->transport[MU_TRANSPORT_OUTPUT];
mu_stream_ref (pstr[MU_TRANSPORT_OUTPUT]);
status = 0;
}
else
mu_stream_unref (instream);
}
return status;
}
static int
_iostream_set_substream (struct _mu_iostream *sp, mu_stream_t *newstr)
{
mu_stream_t saved[2], tmp[2];
int status;
status = _iostream_get_substream (sp, tmp);
if (status)
return status;
saved[MU_TRANSPORT_INPUT] = tmp[MU_TRANSPORT_INPUT];
saved[MU_TRANSPORT_OUTPUT] = tmp[MU_TRANSPORT_OUTPUT];
tmp[MU_TRANSPORT_INPUT] = newstr[MU_TRANSPORT_INPUT];
tmp[MU_TRANSPORT_OUTPUT] = NULL;
status = mu_stream_ioctl (sp->transport[MU_TRANSPORT_INPUT],
MU_IOCTL_SUBSTREAM, MU_IOCTL_OP_SET, tmp);
if (status == ENOSYS)
{
mu_stream_unref (sp->transport[MU_TRANSPORT_INPUT]);
sp->transport[MU_TRANSPORT_INPUT] = newstr[MU_TRANSPORT_INPUT];
mu_stream_ref (sp->transport[MU_TRANSPORT_INPUT]);
status = 0;
}
if (status == 0)
{
tmp[MU_TRANSPORT_INPUT] = NULL;
tmp[MU_TRANSPORT_OUTPUT] = newstr[MU_TRANSPORT_OUTPUT];
status = mu_stream_ioctl (sp->transport[MU_TRANSPORT_OUTPUT],
MU_IOCTL_SUBSTREAM, MU_IOCTL_OP_SET, tmp);
if (status == ENOSYS)
{
mu_stream_unref (sp->transport[MU_TRANSPORT_OUTPUT]);
sp->transport[MU_TRANSPORT_OUTPUT] = newstr[MU_TRANSPORT_OUTPUT];
mu_stream_ref (sp->transport[MU_TRANSPORT_OUTPUT]);
status = 0;
}
else
{
tmp[MU_TRANSPORT_INPUT] = saved[MU_TRANSPORT_INPUT];
tmp[MU_TRANSPORT_OUTPUT] = NULL;
status = mu_stream_ioctl (sp->transport[MU_TRANSPORT_INPUT],
MU_IOCTL_SUBSTREAM, MU_IOCTL_OP_SET, tmp);
}
}
mu_stream_unref (saved[MU_TRANSPORT_INPUT]);
mu_stream_unref (saved[MU_TRANSPORT_OUTPUT]);
return status;
}
static int
_iostream_ctl (struct _mu_stream *str, int code, int opcode, void *arg)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
switch (code)
{
case MU_IOCTL_TRANSPORT:
if (!arg)
return EINVAL;
else
{
mu_transport_t *ptrans = arg;
switch (opcode)
{
case MU_IOCTL_OP_GET:
ptrans[0] = (mu_transport_t) sp->transport[_MU_STREAM_INPUT];
ptrans[1] = (mu_transport_t) sp->transport[_MU_STREAM_OUTPUT];
break;
case MU_IOCTL_OP_SET:
ptrans = arg;
sp->transport[_MU_STREAM_INPUT] = (mu_stream_t) ptrans[0];
sp->transport[_MU_STREAM_OUTPUT] = (mu_stream_t) ptrans[1];
break;
default:
return EINVAL;
}
}
break;
case MU_IOCTL_SUBSTREAM:
if (!arg)
return EINVAL;
else
{
switch (opcode)
{
case MU_IOCTL_OP_GET:
return _iostream_get_substream (sp, arg);
case MU_IOCTL_OP_SET:
return _iostream_set_substream (sp, arg);
default:
return EINVAL;
}
}
break;
case MU_IOCTL_TOPSTREAM:
if (!arg)
return EINVAL;
else
{
mu_stream_t *pstr = arg;
switch (opcode)
{
case MU_IOCTL_OP_GET:
pstr[0] = sp->transport[0];
mu_stream_ref (pstr[0]);
pstr[1] = sp->transport[1];
mu_stream_ref (pstr[1]);
break;
case MU_IOCTL_OP_SET:
mu_stream_unref (sp->transport[0]);
sp->transport[0] = pstr[0];
mu_stream_ref (sp->transport[0]);
mu_stream_unref (sp->transport[1]);
sp->transport[1] = pstr[1];
mu_stream_ref (sp->transport[1]);
break;
default:
return EINVAL;
}
}
break;
case MU_IOCTL_TRANSPORT_BUFFER:
if (!arg)
return EINVAL;
else
{
struct mu_buffer_query *qp = arg;
if (!MU_TRANSPORT_VALID_TYPE (qp->type) || !sp->transport[qp->type])
return EINVAL;
return mu_stream_ioctl (sp->transport[qp->type], code, opcode, arg);
}
case MU_IOCTL_TCPSTREAM:
case MU_IOCTL_TIMEOUT:
//FIXME: what about output stream?
return mu_stream_ioctl (sp->transport[_MU_STREAM_INPUT], code, opcode, arg);
default:
return ENOSYS;
}
return 0;
}
static int
_iostream_wait (struct _mu_stream *str, int *pflags, struct timeval *tvp)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc = EINVAL;
if (*pflags == MU_STREAM_READY_RD)
{
rc = mu_stream_wait (sp->transport[_MU_STREAM_INPUT], pflags, tvp);
if (rc)
sp->last_err_str = _MU_STREAM_INPUT;
}
else if (*pflags == MU_STREAM_READY_WR)
{
rc = mu_stream_wait (sp->transport[_MU_STREAM_OUTPUT], pflags, tvp);
if (rc)
sp->last_err_str = _MU_STREAM_OUTPUT;
}
return rc;
}
static int
_iostream_shutdown (struct _mu_stream *str, int how)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
int rc = EINVAL;
switch (how)
{
case MU_STREAM_READ:
rc = mu_stream_shutdown (sp->transport[_MU_STREAM_INPUT], how);
if (rc)
sp->last_err_str = _MU_STREAM_INPUT;
break;
case MU_STREAM_WRITE:
rc = mu_stream_shutdown (sp->transport[_MU_STREAM_OUTPUT], how);
if (rc)
sp->last_err_str = _MU_STREAM_OUTPUT;
}
return rc;
}
static const char *
_iostream_error_string (struct _mu_stream *str, int rc)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
mu_stream_t transport = sp->transport[sp->last_err_str];
if (transport)
return mu_stream_strerror (transport, rc);
return mu_strerror (rc);
}
static void
_iostream_event (struct _mu_stream *str, int code,
unsigned long lval, void *pval)
{
struct _mu_iostream *sp = (struct _mu_iostream *)str;
if (code == _MU_STR_EVENT_CLRFLAG && lval == _MU_STR_ERR)
{
if (sp->transport[_MU_STREAM_INPUT])
mu_stream_clearerr (sp->transport[_MU_STREAM_INPUT]);
if (sp->transport[_MU_STREAM_OUTPUT])
mu_stream_clearerr (sp->transport[_MU_STREAM_OUTPUT]);
}
}
int
mu_iostream_create (mu_stream_t *pref, mu_stream_t in, mu_stream_t out)
{
struct _mu_iostream *sp;
sp = (struct _mu_iostream *)
_mu_stream_create (sizeof (*sp),
MU_STREAM_READ | MU_STREAM_WRITE);
if (!sp)
return ENOMEM;
sp->stream.flags |= _MU_STR_OPEN;
sp->stream.read = _iostream_read;
sp->stream.write = _iostream_write;
sp->stream.flush = _iostream_flush;
sp->stream.open = _iostream_open;
sp->stream.close = _iostream_close;
sp->stream.done = _iostream_done;
sp->stream.ctl = _iostream_ctl;
sp->stream.wait = _iostream_wait;
sp->stream.shutdown = _iostream_shutdown;
sp->stream.error_string = _iostream_error_string;
sp->stream.event_cb = _iostream_event;
sp->stream.event_mask = _MU_STR_EVMASK (_MU_STR_EVENT_CLRFLAG);
mu_stream_ref (in);
sp->transport[_MU_STREAM_INPUT] = in;
if (!out)
out = in;
mu_stream_ref (out);
sp->transport[_MU_STREAM_OUTPUT] = out;
mu_stream_set_buffer ((mu_stream_t) sp, mu_buffer_line, 0);
*pref = (mu_stream_t) sp;
return 0;
}
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