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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->child = NULL;
return n;
}
void
release_kbnode( KBNODE n )
{
KBNODE n2;
while( n ) {
n2 = n->next;
release_kbnode( n->child );
free_packet( n->pkt );
m_free( n );
n = n2;
}
}
/****************
* 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;
}
/****************
* Append NODE to ROOT as child of ROOT
*/
void
add_kbnode_as_child( KBNODE root, KBNODE node )
{
KBNODE n1;
if( !(n1=root->child) )
root->child = node;
else {
for( ; n1->next; n1 = n1->next)
;
n1->next = node;
}
}
/****************
* Return the parent node of KBNODE from the tree with ROOT
*/
KBNODE
find_kbparent( KBNODE root, KBNODE node )
{
KBNODE n, n2;
for( ; root; root = root->child) {
for( n = root; n; n = n->next) {
for( n2 = n->child; n2; n2 = n2->next ) {
if( n2 == node )
return n;
}
}
}
return NULL;
}
/****************
* Walk through a tree 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_kbtree( KBNODE root, KBNODE *context )
{
KBNODE n;
if( !*context ) {
*context = root;
return root;
}
n = *context;
if( n->child ) {
n = n->child;
*context = n;
}
else if( n->next ) {
n = n->next;
*context = n;
}
else if( (n = find_kbparent( root, n )) ) {
n = n->next;
*context = n;
}
return n;
}
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