dattribute.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 <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <mailutils/error.h>
#include <mailutils/sys/attribute.h>
static int
_da_ref (attribute_t attribute)
{
struct _da *da = (struct _da *)attribute;
return mu_refcount_inc (da->refcount);
}
static void
_da_destroy (attribute_t *pattribute)
{
struct _da *da = (struct _da *)*pattribute;
if (mu_refcount_dec (da->refcount) == 0)
{
mu_refcount_destroy (&da->refcount);
free (da);
}
}
static int
_da_get_flags (attribute_t attribute, int *pflags)
{
struct _da *da = (struct _da *)attribute;
mu_refcount_lock (da->refcount);
if (pflags)
*pflags = da->flags;
mu_refcount_unlock (da->refcount);
return 0;
}
static int
_da_set_flags (attribute_t attribute, int flags)
{
struct _da *da = (struct _da *)attribute;
mu_refcount_lock (da->refcount);
da->flags |= (flags | MU_ATTRIBUTE_MODIFIED);
mu_refcount_unlock (da->refcount);
return 0;
}
static int
_da_unset_flags (attribute_t attribute, int flags)
{
struct _da *da = (struct _da *)attribute;
mu_refcount_lock (da->refcount);
da->flags &= ~flags;
/* If Modified was being unset do not reset it. */
if (!(flags & MU_ATTRIBUTE_MODIFIED))
da->flags |= MU_ATTRIBUTE_MODIFIED;
mu_refcount_unlock (da->refcount);
return 0;
}
static int
_da_clear_flags (attribute_t attribute)
{
struct _da *da = (struct _da *)attribute;
mu_refcount_lock (da->refcount);
da->flags = 0;
mu_refcount_unlock (da->refcount);
return 0;
}
static struct _attribute_vtable _da_vtable =
{
_da_ref,
_da_destroy,
_da_get_flags,
_da_set_flags,
_da_unset_flags,
_da_clear_flags
};
int
attribute_create (attribute_t *pattribute)
{
struct _da *da;
if (pattribute == NULL)
return MU_ERROR_INVALID_PARAMETER;
da = calloc (1, sizeof *da);
if (da == NULL)
return MU_ERROR_NO_MEMORY;
mu_refcount_create (&(da->refcount));
if (da->refcount == NULL)
{
free (da);
return MU_ERROR_NO_MEMORY;
}
da->flags = 0;
da->base.vtable = &_da_vtable;
*pattribute = &da->base;
return 0;
}