stdio_stream.c
2.19 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2009-2012 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 <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <mailutils/types.h>
#include <mailutils/stream.h>
#include <mailutils/sys/stream.h>
#include <mailutils/sys/file_stream.h>
int
mu_stdio_stream_create (mu_stream_t *pstream, int fd, int flags)
{
int rc;
char *filename;
mu_stream_t transport;
int need_cache;
struct _mu_file_stream *fstr;
switch (fd)
{
case MU_STDIN_FD:
flags |= MU_STREAM_READ;
break;
case MU_STDOUT_FD:
case MU_STDERR_FD:
flags |= MU_STREAM_WRITE;
}
need_cache = flags & MU_STREAM_SEEK;
if (need_cache && (flags & MU_STREAM_WRITE))
/* Write caches are not supported */
return EINVAL;
if (flags & MU_STREAM_READ)
filename = "<stdin>";
else
filename = "<stdout>";
/* Create transport stream. */
rc = _mu_file_stream_create (&fstr, sizeof (*fstr),
filename, fd, flags & ~MU_STREAM_SEEK);
if (rc)
return rc;
fstr->stream.flags |= _MU_STR_OPEN;
fstr->stream.open = NULL;
transport = (mu_stream_t) fstr;
mu_stream_set_buffer (transport, mu_buffer_line, 0);
/* Wrap it in cache, if required */
if (need_cache)
{
mu_stream_t str;
rc = mu_rdcache_stream_create (&str, transport, flags);
mu_stream_unref (transport);
if (rc)
return rc;
transport = str;
}
*pstream = transport;
return 0;
}