ucx: src/tree.c@425234b05dff (annotated)

src/tree.c@425234b05dff (annotated)

src/tree.c

Mon, 22 Jan 2024 19:34:38 +0100

author: Mike Becker <universe@uap-core.de>
date: Mon, 22 Jan 2024 19:34:38 +0100
changeset 816: 425234b05dff
child 826: 21840975d541
permissions: -rw-r--r--

add first basic low level tree functions

relates to #165 tested by issue #167

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include "cx/tree.h"
 #include <assert.h>
 #define CX_TREE_PTR(cur, off) (*(void**)(((char*)(cur))+(off)))
 #define CX_TREE_PTR(cur, off) (*(void**)(((char*)(cur))+(off)))
 #define tree_parent(node) CX_TREE_PTR(node, loc_parent)
 #define tree_children(node) CX_TREE_PTR(node, loc_children)
 #define tree_prev(node) CX_TREE_PTR(node, loc_prev)
 #define tree_next(node) CX_TREE_PTR(node, loc_next)
 void cx_tree_link(
         void *restrict parent,
         void *restrict node,
         ptrdiff_t loc_parent,
         ptrdiff_t loc_children,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next
 ) {
     void *current_parent = tree_parent(node);
     if (current_parent == parent) return;
     if (current_parent != NULL) {
         cx_tree_unlink(node, loc_parent, loc_children,
                        loc_prev, loc_next);
     }
     if (tree_children(parent) == NULL) {
         tree_children(parent) = node;
     } else {
         void *children = tree_children(parent);
         tree_prev(children) = node;
         tree_next(node) = children;
         tree_children(parent) = node;
     }
     tree_parent(node) = parent;
 }
 void cx_tree_unlink(
         void *node,
         ptrdiff_t loc_parent,
         ptrdiff_t loc_children,
         ptrdiff_t loc_prev,
         ptrdiff_t loc_next
 ) {
     if (tree_parent(node) == NULL) return;
     void *left = tree_prev(node);
     void *right = tree_next(node);
     assert(left == NULL || tree_children(tree_parent(node)) != node);
     if (left == NULL) {
         tree_children(tree_parent(node)) = right;
     } else {
         tree_next(left) = right;
     }
     if (right != NULL) tree_prev(right) = left;
     tree_parent(node) = NULL;
     tree_prev(node) = NULL;
     tree_next(node) = NULL;
 }

Mercurial > hg > ucx / annotate

src/tree.c@425234b05dff (annotated)

src/tree.c