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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: clib/src/tree_iter.c $ */
/* */
/* OpenPOWER FFS Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2014,2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/*
* File: tree_iter.c
* Author: Shaun Wetzstein <shaun@us.ibm.com>
* Descr:
* Note:
* Date: 10/22/10
*/
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <malloc.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "libclib.h"
#include "vector.h"
#include "tree_iter.h"
/* ======================================================================= */
int tree_iter_init(tree_iter_t * self, tree_t * tree, uint32_t flags)
{
assert(self != NULL);
assert(tree != NULL);
self->node = NULL;
self->safe = NULL;
self->tree = tree;
self->flags = flags;
return tree_iter_clear(self);
}
int tree_iter_clear(tree_iter_t * self)
{
assert(self != NULL);
if (self->flags & TI_FLAG_FWD) {
self->node = tree_min(self->tree);
if (self->node != NULL)
self->safe = tree_node_next(self->node);
} else if (self->flags & TI_FLAG_BWD) {
self->node = tree_max(self->tree);
if (self->node != NULL)
self->safe = tree_node_prev(self->node);
} else {
UNEXPECTED("invalid tree_iter flags");
return -1;
}
return 0;
}
tree_node_t *tree_iter_elem(tree_iter_t * self)
{
assert(self != NULL);
return self->node;
}
tree_node_t *tree_iter_inc1(tree_iter_t * self)
{
return tree_iter_inc2(self, 1);
}
tree_node_t *tree_iter_inc2(tree_iter_t * self, size_t count)
{
assert(self != NULL);
for (size_t i = 0; i < count && self->node != NULL; i++) {
if (self->flags & TI_FLAG_FWD) {
self->node = self->safe;
if (self->node != NULL)
self->safe = tree_node_next(self->node);
} else if (self->flags & TI_FLAG_BWD) {
self->node = self->safe;
if (self->node != NULL)
self->safe = tree_node_prev(self->node);
} else {
UNEXPECTED("invalid tree_iter flags");
return NULL;
}
}
return self->node;
}
tree_node_t *tree_iter_dec1(tree_iter_t * self)
{
return tree_iter_dec2(self, 1);
}
tree_node_t *tree_iter_dec2(tree_iter_t * self, size_t count)
{
assert(self != NULL);
for (size_t i = 0; i < count && self->node != NULL; i++) {
if (self->flags & TI_FLAG_FWD) {
self->node = self->safe;
if (self->node != NULL)
self->safe = tree_node_prev(self->node);
} else if (self->flags & TI_FLAG_BWD) {
self->node = self->safe;
if (self->node != NULL)
self->safe = tree_node_next(self->node);
} else {
UNEXPECTED("invalid tree_iter flags");
return NULL;
}
}
return self->node;
}
/* ======================================================================= */
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