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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2022-2025 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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <mailutils/types.h>
#include <mailutils/errno.h>
#include <mailutils/stream.h>
/*
* Create and open a flat file (mbox or dotmail) mailbox.
*/
int
mu_mailbox_stream_create (mu_stream_t *pstream, const char *filename, int flags)
{
int try_mmap = 1;
int rc;
if (!pstream || !filename)
return EINVAL;
if (flags & MU_STREAM_APPEND)
{
/*
* If append mode is requested, convert it to read-write, so that
* mboxrd/dotmail drivers are able to update the X-IMAPbase header
* in the first message, if necessary.
*
* Don't try to use mmap, as it is highly inefficient in append
* mode.
*/
flags = (flags & ~MU_STREAM_APPEND) | MU_STREAM_RDWR;
try_mmap = 0;
}
else
{
struct stat st;
if (flags & MU_STREAM_WRITE)
flags |= MU_STREAM_READ;
if (stat (filename, &st) == 0)
{
try_mmap = st.st_size > 0;
}
else if (errno == ENOENT)
{
try_mmap = 0;
}
}
if (try_mmap)
{
rc = mu_mapfile_stream_create (pstream, filename, flags);
if (rc == 0)
return 0;
}
return mu_file_stream_create (pstream, filename, flags);
}
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