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/* kbnode.c - keyblock node utility functions
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 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 2 of the License, or
* (at your option) any later version.
*
* G10 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "util.h"
#include "memory.h"
#include "packet.h"
#include "keydb.h"
KBNODE
new_kbnode( PACKET *pkt )
{
KBNODE n = m_alloc( sizeof *n );
n->next = NULL;
n->pkt = pkt;
n->flag = 0;
n->private_flag=0; /* kludge to delete a node */
return n;
}
void
release_kbnode( KBNODE n )
{
KBNODE n2;
while( n ) {
n2 = n->next;
free_packet( n->pkt );
m_free( n );
n = n2;
}
}
/****************
* Delete NODE from ROOT, ROOT must exist!
* Note: This does only work with walk_kbnode!!
*/
void
delete_kbnode( KBNODE root, KBNODE node )
{
node->private_flag |= 1;
}
/****************
* Append NODE to ROOT, ROOT must exist!
*/
void
add_kbnode( KBNODE root, KBNODE node )
{
KBNODE n1;
for(n1=root; n1->next; n1 = n1->next)
;
n1->next = node;
}
/****************
* Insert NODE into the list after root but before a packet with type PKTTYPE
* (only if PKTTYPE != 0)
*/
void
insert_kbnode( KBNODE root, KBNODE node, int pkttype )
{
if( !pkttype ) {
node->next = root->next;
root->next = node;
}
else {
KBNODE n1;
for(n1=root; n1->next; n1 = n1->next)
if( pkttype == n1->next->pkt->pkttype ) {
node->next = n1->next;
n1->next = node;
return;
}
/* no such packet, append */
node->next = NULL;
n1->next = node;
}
}
/****************
* Find the previous node (if PKTTYPE = 0) or the previous node
* with pkttype PKTTYPE in the list starting with ROOT of NODE.
*/
KBNODE
find_prev_kbnode( KBNODE root, KBNODE node, int pkttype )
{
KBNODE n1;
for(n1=NULL ; root && root != node; root = root->next )
if( !pkttype || root->pkt->pkttype == pkttype )
n1 = root;
return n1;
}
/****************
* Ditto, but find the next package. The behaviour is trivial if
* PKTTYPE is 0 but if it is specified, the next node with a packet
* of this type is returned. The function has some knowledge about
* the valid ordering of packets: e.g. if the next signature packet
* is requested, the function will not return one if it encounters
* a user-id.
*/
KBNODE
find_next_kbnode( KBNODE node, int pkttype )
{
for( node=node->next ; node; node = node->next ) {
if( !pkttype )
return node;
else if( pkttype == PKT_USER_ID
&& ( node->pkt->pkttype == PKT_PUBLIC_CERT
|| node->pkt->pkttype == PKT_SECRET_CERT ) )
return NULL;
else if( pkttype == PKT_SIGNATURE
&& ( node->pkt->pkttype == PKT_USER_ID
|| node->pkt->pkttype == PKT_PUBLIC_CERT
|| node->pkt->pkttype == PKT_SECRET_CERT ) )
return NULL;
else if( node->pkt->pkttype == pkttype )
return node;
}
return NULL;
}
KBNODE
find_kbnode( KBNODE node, int pkttype )
{
for( ; node; node = node->next ) {
if( node->pkt->pkttype == pkttype )
return node;
}
return NULL;
}
/****************
* Walk through a list of kbnodes. This functions returns
* the next kbnode for each call; before using the function the first
* time, the caller must set CONTEXT to NULL (This has simply the effect
* to start with ROOT).
*/
KBNODE
walk_kbnode( KBNODE root, KBNODE *context, int all )
{
KBNODE n;
do {
if( !*context ) {
*context = root;
return root;
}
n = (*context)->next;
*context = n;
} while( !all && n && (n->private_flag & 1) );
return n;
}
void
clear_kbnode_flags( KBNODE n )
{
for( ; n; n = n->next ) {
n->flag = 0;
}
}
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