actube/src/cw/avliter_next.c

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/*
This file is part of libcapwap.
libcapwap 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 of the License, or
(at your option) any later version.
libcapwap 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 Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
/**
*@file
*@brief Implementation of avliter_next
*/
#include "avltree.h"
/**
* Get the next element within an AVL Tree.
* @param i pointer to AVL Iterator
* @return the element or NULL if there is no next elemeent.
*/
void * avliter_next(avliter_t *i)
{
while ( i->stack_ptr) {
i->stack_ptr--;
i->cur=i->stack[i->stack_ptr];
if (!i->cur)
continue;
if ((i->stack_ptr)&1) {
return i->cur->data;
}
break;
}
if (!i->cur){
return NULL;
}
while(i->cur->left) {
/* push right branch */
i->stack[i->stack_ptr++]=i->cur->right;
/* push node */
i->stack[i->stack_ptr++]=i->cur;
i->cur=i->cur->left;
}
i->stack[i->stack_ptr++]=i->cur->right;
return i->cur->data;
}