mbox_open.c
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Library Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <mailutils/error.h>
#include <mailutils/sys/mbox.h>
int
mbox_open (mbox_t mbox, const char *filename, int flags)
{
int status = 0;
char from[12];
size_t n = 0;
mbox_debug_print (mbox, "open(%s,%d)", (filename) ? filename : "", flags);
if (mbox == NULL)
return MU_ERROR_INVALID_PARAMETER;
if (mbox->carrier == NULL)
{
stream_t carrier;
status = mbox_get_carrier (mbox, &carrier);
if (status != 0)
return status;
}
else
mbox_close (mbox);
status = stream_open (mbox->carrier, filename, 0, flags);
if (status != 0)
return status;
/* We need to be able to seek on the stream. */
if (!stream_is_seekable (mbox->carrier))
return MU_ERROR_NOT_SUPPORTED;
/* Check if it is indeed a mbox format. */
stream_readline (mbox->carrier, from, sizeof from, 0, &n);
if (status != 0)
return status;
/* Empty file is Ok. */
if (n)
{
status = strncmp (from, "From ", 5);
if (status != 0)
return MU_ERROR_NOT_SUPPORTED;
}
/* Give an appropriate way to file lock. */
/* FIXME: use dotlock external program: we may not be setgid. */
status = lockfile_dotlock_create (&(mbox->lockfile), filename);
mbox->filename = strdup (filename);
return status;
}