actube/src/capwap/avliter_seek.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_seek
*/
#include "avltree.h"
/**
* Set an AVL Iterator to a specific position.
* @param i AVL Iterator
* @param d element to search for
* @return element found or NULL if not found
*/
void * avliter_seek(avliter_t *i,void *d)
{
if (!i->root)
return NULL;
i->cur=i->root;
i->stack_ptr=0;
int rc;
while(i->cur) {
rc = i->cmp(d,i->cur->data);
if (rc==0){
i->stack[i->stack_ptr++]=i->cur->right;
i->stack[i->stack_ptr++]=i->cur;
return avliter_next(i);
}
if (rc<0) {
i->stack[i->stack_ptr++]=i->cur->right;
i->stack[i->stack_ptr++]=i->cur;
i->cur=i->cur->left;
}
if (rc>0) {
i->cur=i->cur->right;
}
}
return NULL;
}