negate.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2011-2012, 2014-2016 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <mailutils/types.h>
#include <mailutils/errno.h>
#include <mailutils/list.h>
#include <mailutils/mailbox.h>
#include <mailutils/msgset.h>
#include <mailutils/sys/msgset.h>
struct invert_closure
{
mu_msgset_t nset;
size_t next_num;
};
static int
_invert_range (void *item, void *data)
{
struct mu_msgrange *range = item;
struct invert_closure *clos = data;
int rc;
if (clos->next_num < range->msg_beg - 1)
{
rc = mu_msgset_add_range (clos->nset,
clos->next_num, range->msg_beg - 1,
_MU_MSGSET_MODE (clos->nset->flags));
if (rc)
return rc;
}
clos->next_num = range->msg_end + 1;
return 0;
}
/* Negate the message set: on return PNSET consists of the messages
_not contained_ in the input message set. */
int
mu_msgset_negate (mu_msgset_t msgset, mu_msgset_t *pnset)
{
int rc;
struct invert_closure clos;
size_t total;
if (!msgset)
return EINVAL;
if (!msgset->mbox)
return MU_ERR_NOT_OPEN;
rc = mu_msgset_aggregate (msgset);
if (rc)
return rc;
rc = mu_mailbox_messages_count (msgset->mbox, &total);
if (rc)
return rc;
if (_MU_MSGSET_MODE (msgset->flags))
{
rc = mu_mailbox_translate (msgset->mbox,
MU_MAILBOX_MSGNO_TO_UID,
total, &total);
if (rc)
return rc;
}
rc = mu_msgset_create (&clos.nset, msgset->mbox,
_MU_MSGSET_MODE (msgset->flags));
if (rc)
return rc;
clos.next_num = 1;
rc = mu_list_foreach (msgset->list, _invert_range, &clos);
if (rc == 0)
{
if (clos.next_num < total)
rc = mu_msgset_add_range (clos.nset, clos.next_num, total,
_MU_MSGSET_MODE (clos.nset->flags));
}
if (rc)
mu_msgset_free (clos.nset);
else
*pnset = clos.nset;
return rc;
}