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Merge pull request 'Red-black tree' (#5) from Chewing_Bever/libvieter:red-black-tree into dev 

Reviewed-on: vieter-v/libvieter#5
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Jef Roosens 2023-03-07 12:08:49 +01:00
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

6
Makefile
View File

@ -11,7 +11,7 @@ INC_DIRS ?= include
LIB := $(BUILD_DIR)/$(LIB_FILENAME) LIB := $(BUILD_DIR)/$(LIB_FILENAME)
SRCS != find '$(SRC_DIR)' -iname '*.c' SRCS != find '$(SRC_DIR)' -iname '*.c'
SRCS_H != find $(INC_DIRS) -iname '*.h' SRCS_H != find $(INC_DIRS) '$(SRC_DIR)' -iname '*.h'
SRCS_TEST != find '$(TEST_DIR)' -iname '*.c' SRCS_TEST != find '$(TEST_DIR)' -iname '*.c'
OBJS := $(SRCS:%=$(BUILD_DIR)/%.o) OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
@ -43,7 +43,7 @@ objs: $(OBJS)
.PHONY: vieter .PHONY: vieter
vieter: $(LIB) vieter: $(LIB)
$(BUILD_DIR)/$(LIB_FILENAME): $(OBJS) $(LIB): $(OBJS)
ar -rcs $@ $(OBJS) ar -rcs $@ $(OBJS)
$(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c $(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
@ -69,8 +69,6 @@ $(TARGETS_MEM_TEST): test-mem-%: %
.PHONY: build-test .PHONY: build-test
build-test: $(BINS_TEST) build-test: $(BINS_TEST)
# For simplicity, we link every object file to each of the test files. This
# might be changed later if this starts to become too slow.
$(BINS_TEST): %: %.c.o $(LIB) $(BINS_TEST): %: %.c.o $(LIB)
$(CC) \ $(CC) \
$^ -o $@ $^ -o $@

11
README.md
View File

@ -53,6 +53,17 @@ files defined in its respective module. This allows testing internal functions.
To run the tests, simply run `make test`. If you wish to only run a specific To run the tests, simply run `make test`. If you wish to only run a specific
test binary, you can find them in `build/test`. test binary, you can find them in `build/test`.
The name of tests in the `TEST_LIST` variable should be prefixed with the
module they're testing. This makes it much easier to distinguish the output of
tests in the CLI. For example:
```c
TEST_LIST = {
{"cron illegal parts", test_illegal_parts},
{NULL, NULL}
};
```
### `compile_commands.json` ### `compile_commands.json`
Clangd requires a `compile_commands.json` to function properly. You can Clangd requires a `compile_commands.json` to function properly. You can

70
include/vieter_tree.h 100644
View File

@ -0,0 +1,70 @@
#ifndef VIETER_TREE
#define VIETER_TREE
#include <stdint.h>
#include <stdlib.h>
typedef struct vieter_tree vieter_tree;
typedef enum vieter_tree_error {
vieter_tree_ok = 0,
vieter_tree_already_present = 1,
vieter_tree_not_present = 2,
vieter_tree_iterator_done = 3
} vieter_tree_error;
/*
* Allocate and initialize a new red-black binary tree.
*/
vieter_tree *vieter_tree_init();
/*
* Deallocate a red-black binary tree.
*/
void vieter_tree_free(vieter_tree *tree);
/*
* Insert a new entry into the tree.
*/
vieter_tree_error vieter_tree_insert(vieter_tree *tree, uint64_t key,
void *data);
/*
* Look for an entry in the tree.
*/
vieter_tree_error vieter_tree_search(void **out, vieter_tree *tree,
uint64_t key);
/*
* Remove a given entry from the tree.
*/
vieter_tree_error vieter_tree_remove(void **out, vieter_tree *tree,
uint64_t key);
/*
* Return how many entries are currently in the tree.
*/
uint64_t vieter_tree_size(vieter_tree *tree);
/*
* An iterator that can be used to traverse a tree in-order.
*/
typedef struct vieter_tree_iterator vieter_tree_iterator;
/*
* Allocate and initialize a new iterator from the given tree.
*/
vieter_tree_iterator *vieter_tree_iterator_from(vieter_tree *tree);
/*
* Free an iterator.
*/
void vieter_tree_iterator_free(vieter_tree_iterator **ptp);
/*
* Return the iterator's next element.
*/
vieter_tree_error vieter_tree_iterator_next(void **out,
vieter_tree_iterator *iter);
#endif

2
src/cron/vieter_cron_parse.c
View File

@ -1,4 +1,4 @@
#include "vieter_cron.h" #include "vieter_cron_parse.h"
#include <stdbool.h> #include <stdbool.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>

11
src/cron/vieter_cron_parse.h 100644
View File

@ -0,0 +1,11 @@
#ifndef VIETER_CRON_PARSE
#define VIETER_CRON_PARSE
#include "vieter_cron.h"
vieter_cron_parse_error vieter_cron_expr_parse_range(uint64_t *out, char *s,
uint8_t min, uint8_t max);
vieter_cron_parse_error vieter_cron_expr_parse_part(uint64_t *out, char *s,
uint8_t min, uint8_t max);
#endif

3
src/heap/vieter_heap_tree.h
View File

@ -36,7 +36,8 @@ void vieter_heap_tree_free(vieter_heap_node *root);
* Given the roots of the smallest trees in two heaps, merge them into a single * Given the roots of the smallest trees in two heaps, merge them into a single
* large heap. * large heap.
*/ */
vieter_heap_node *vieter_heap_tree_merge(vieter_heap_node *root_a, vieter_heap_node *root_b); vieter_heap_node *vieter_heap_tree_merge(vieter_heap_node *root_a,
vieter_heap_node *root_b);
/* /*
* Given the roots of two trees of the same order, merge them into a heap of one * Given the roots of two trees of the same order, merge them into a heap of one

116
src/tree/vieter_tree.c 100644
View File

@ -0,0 +1,116 @@
#include "vieter_tree_balancing.h"
#include "vieter_tree_internal.h"
vieter_tree *vieter_tree_init() { return calloc(1, sizeof(vieter_tree)); }
uint64_t vieter_tree_size(vieter_tree *tree) { return tree->size; }
vieter_tree_error vieter_tree_insert(vieter_tree *tree, uint64_t key,
void *data) {
if (tree->size == 0) {
tree->root = vieter_tree_node_init();
tree->root->key = key;
tree->root->data = data;
vieter_tree_node_set(tree->root, vieter_tree_node_black, true);
tree->size = 1;
return vieter_tree_ok;
}
vieter_tree_error res = vieter_tree_node_insert(tree->root, key, data);
if (res != vieter_tree_ok) {
return res;
}
tree->size++;
return vieter_tree_ok;
}
vieter_tree_error vieter_tree_search(void **out, vieter_tree *tree,
uint64_t key) {
if (tree->size == 0) {
return vieter_tree_not_present;
}
return vieter_tree_node_search(out, tree->root, key);
}
vieter_tree_error vieter_tree_remove(void **out, vieter_tree *tree,
uint64_t key) {
if (tree->size == 0) {
return vieter_tree_not_present;
}
vieter_tree_error res = vieter_tree_node_remove(out, &tree->root, key);
if (res != vieter_tree_ok) {
return res;
}
tree->size--;
return vieter_tree_ok;
}
void vieter_tree_free(vieter_tree *tree) {
if (tree->size == 0) {
goto end;
}
uint64_t capacity = 4;
uint64_t size = 1;
vieter_tree_node **stack = malloc(capacity * sizeof(vieter_tree_node *));
stack[0] = tree->root;
vieter_tree_node *node;
while (size > 0) {
node = stack[size - 1];
size--;
if (size + 2 > capacity) {
capacity *= 2;
stack = realloc(stack, capacity * sizeof(vieter_tree_node *));
}
if (node->children[0] != NULL) {
stack[size] = node->children[0];
size++;
}
if (node->children[1] != NULL) {
stack[size] = node->children[1];
size++;
}
vieter_tree_node_free(node);
}
free(stack);
end:
free(tree);
}
bool vieter_tree_validate(vieter_tree *tree) {
if (tree->size == 0) {
return true;
}
// DFS to get expected black nodes
uint64_t expected_black_nodes = 0;
vieter_tree_node *node = tree->root;
while (node != NULL) {
if (vieter_tree_node_get(node, vieter_tree_node_black)) {
expected_black_nodes++;
}
node = node->children[0];
}
return vieter_tree_node_get(tree->root, vieter_tree_node_black) &&
vieter_tree_node_validate(tree->root, 0, expected_black_nodes);
}

289
src/tree/vieter_tree_balancing.c 100644
View File

@ -0,0 +1,289 @@
#include "vieter_tree_balancing.h"
#include <string.h>
bool vieter_tree_node_validate(vieter_tree_node *node,
uint64_t passed_black_nodes,
uint64_t expected_black_nodes) {
// Path to NULL children should contain the same amount of black nodes
if (node == NULL) {
return passed_black_nodes == expected_black_nodes;
}
if (vieter_tree_node_get(node, vieter_tree_node_black)) {
passed_black_nodes++;
}
// Either the node itself is black, or its children are both either NULL or
// black.
bool correctly_colored_children =
vieter_tree_node_get(node, vieter_tree_node_black) ||
((node->children[0] == NULL ||
vieter_tree_node_get(node->children[0], vieter_tree_node_black)) &&
(node->children[1] == NULL ||
vieter_tree_node_get(node->children[1], vieter_tree_node_black)));
bool right_child_flag_set =
node->parent == NULL ||
(vieter_tree_node_get(node, vieter_tree_node_right) ==
(node->parent->children[1] == node));
return correctly_colored_children && right_child_flag_set &&
vieter_tree_node_validate(node->children[0], passed_black_nodes,
expected_black_nodes) &&
vieter_tree_node_validate(node->children[1], passed_black_nodes,
expected_black_nodes);
}
/*
* This function should be rewritten to use tree rotations instead.
*/
vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node) {
vieter_tree_node *parent = node->parent;
vieter_tree_node *grand_parent = parent->parent;
vieter_tree_node *root = grand_parent;
vieter_tree_node *children[2];
vieter_tree_node *grand_children[4];
uint64_t key_root = root->key;
void *data_root = root->data;
if (vieter_tree_node_get(node, vieter_tree_node_right)) {
children[0] = parent;
children[1] = node;
if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
root->key = parent->key;
root->data = parent->data;
parent->key = key_root;
parent->data = data_root;
grand_children[0] = grand_parent->children[0];
grand_children[1] = parent->children[0];
grand_children[2] = node->children[0];
grand_children[3] = node->children[1];
} else {
root->key = node->key;
root->data = node->data;
node->key = key_root;
node->data = data_root;
grand_children[0] = parent->children[0];
grand_children[1] = node->children[0];
grand_children[2] = node->children[1];
grand_children[3] = grand_parent->children[1];
}
} else {
children[0] = node;
children[1] = parent;
if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
root->key = node->key;
root->data = node->data;
node->key = key_root;
node->data = data_root;
grand_children[0] = grand_parent->children[0];
grand_children[1] = node->children[0];
grand_children[2] = node->children[1];
grand_children[3] = parent->children[1];
} else {
root->key = parent->key;
root->data = parent->data;
parent->key = key_root;
parent->data = data_root;
grand_children[0] = node->children[0];
grand_children[1] = node->children[1];
grand_children[2] = parent->children[1];
grand_children[3] = grand_parent->children[1];
}
}
vieter_tree_node_set(
root, vieter_tree_node_right,
vieter_tree_node_get(grand_parent, vieter_tree_node_right));
vieter_tree_node_set(children[0], vieter_tree_node_black, true);
vieter_tree_node_set(children[1], vieter_tree_node_black, true);
vieter_tree_node_set(root, vieter_tree_node_black, false);
vieter_tree_node_set_children(children[0], grand_children);
vieter_tree_node_set_children(children[1], grand_children + 2);
vieter_tree_node_set_children(root, children);
return root;
}
void vieter_tree_node_balance_after_insert(vieter_tree_node *node) {
while (!vieter_tree_node_get(node, vieter_tree_node_black) &&
node->parent != NULL &&
!vieter_tree_node_get(node->parent, vieter_tree_node_black)) {
node = vieter_tree_node_balance(node);
}
// The root must always be black
if (node->parent == NULL) {
vieter_tree_node_set(node, vieter_tree_node_black, true);
}
}
vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root,
bool dir) {
vieter_tree_node *new_root = old_root->children[1 - dir];
if (old_root->parent != NULL) {
vieter_tree_node_set_child(
old_root->parent, new_root,
vieter_tree_node_get(old_root, vieter_tree_node_right));
} else {
new_root->parent = NULL;
}
// Right rotation
if (dir) {
vieter_tree_node_set_child(old_root, new_root->children[1], false);
vieter_tree_node_set_child(new_root, old_root, true);
}
// Left rotation
else {
vieter_tree_node_set_child(old_root, new_root->children[0], true);
vieter_tree_node_set_child(new_root, old_root, false);
}
return new_root;
}
/*
* This function is currently implemented by very literally following the
* Wikipedia pseudocode. It's honestly not too bad, and I couldn't be bothered
* to properly research how to implement red-black removal (how is this so hard
* to find?)
*
* https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Removal_of_a_black_non-root_leaf
*/
vieter_tree_node *vieter_tree_node_remove_balanced(vieter_tree_node *node) {
vieter_tree_node *out;
if (node->parent == NULL) {
out = node->children[0] != NULL ? node->children[0] : node->children[1];
vieter_tree_node_free(node);
// This only happens when the root was the only element in the tree
if (out == NULL)
return out;
vieter_tree_node_set(out, vieter_tree_node_black, true);
out->parent = NULL;
return out;
}
// A red node can only have 0 or 2 children. The node we receive only has
// one child at most, so we know if it's red that it doesn't have any
// children. A black node that has a single (right) child can be replaced by
// this child, granted it becomes black as well. Either way, the node can be
// replaced by its right child (even if it's NULL).
if (!vieter_tree_node_get(node, vieter_tree_node_black) ||
node->children[1] != NULL) {
out = node->children[1];
vieter_tree_node_set_child(
node->parent, node->children[1],
vieter_tree_node_get(node, vieter_tree_node_right));
if (node->children[1] != NULL)
vieter_tree_node_set(node->children[1], vieter_tree_node_black, true);
vieter_tree_node_free(node);
return out;
}
// The complicated case is when we want to remove a black leaf
// https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Removal_of_a_black_non-root_leaf
out = node;
vieter_tree_node *parent = node->parent;
vieter_tree_node *sibling, *close_nephew, *distant_nephew;
bool dir = vieter_tree_node_get(node, vieter_tree_node_right);
parent->children[dir] = NULL;
vieter_tree_node_free(node);
goto start;
do {
dir = vieter_tree_node_get(node, vieter_tree_node_right);
start:
sibling = parent->children[1 - dir];
distant_nephew = sibling->children[1 - dir];
close_nephew = sibling->children[dir];
if (!vieter_tree_node_get(sibling, vieter_tree_node_black))
goto case3;
if (distant_nephew != NULL &&
!vieter_tree_node_get(distant_nephew, vieter_tree_node_black))
goto case6;
if (close_nephew != NULL &&
!vieter_tree_node_get(close_nephew, vieter_tree_node_black))
goto case5;
if (!vieter_tree_node_get(parent, vieter_tree_node_black))
goto case4;
// Case 2
vieter_tree_node_set(sibling, vieter_tree_node_black, false);
node = parent;
out = node;
} while ((parent = node->parent) != NULL);
// Case 1
return out;
case3:
out = vieter_tree_node_rotate(parent, dir);
vieter_tree_node_set(parent, vieter_tree_node_black, false);
vieter_tree_node_set(sibling, vieter_tree_node_black, true);
sibling = close_nephew;
distant_nephew = sibling->children[1 - dir];
if (distant_nephew != NULL &&
!vieter_tree_node_get(distant_nephew, vieter_tree_node_black))
goto case6;
close_nephew = sibling->children[dir];
if (close_nephew != NULL &&
!vieter_tree_node_get(close_nephew, vieter_tree_node_black))
goto case5;
case4:
vieter_tree_node_set(sibling, vieter_tree_node_black, false);
vieter_tree_node_set(parent, vieter_tree_node_black, true);
return out;
case5:
vieter_tree_node_rotate(sibling, 1 - dir);
vieter_tree_node_set(sibling, vieter_tree_node_black, false);
vieter_tree_node_set(close_nephew, vieter_tree_node_black, true);
distant_nephew = sibling;
sibling = close_nephew;
case6:
out = vieter_tree_node_rotate(parent, dir);
vieter_tree_node_set(sibling, vieter_tree_node_black,
vieter_tree_node_get(parent, vieter_tree_node_black));
vieter_tree_node_set(parent, vieter_tree_node_black, true);
vieter_tree_node_set(distant_nephew, vieter_tree_node_black, true);
return out;
}

46
src/tree/vieter_tree_balancing.h 100644
View File

@ -0,0 +1,46 @@
#ifndef VIETER_TREE_BALANCING
#define VIETER_TREE_BALANCING
#include "vieter_tree_node.h"
/*
* Check whether the given tree is a valid red-black tree.
*
* @param node root of the (sub)tree
* @param passed_black_nodes how many black nodes the recursion has already seen
* at this point. This should be initialized as 0 for the topmost call.
* @param expected_black_nodes the correct amount of black nodes to expect when
* a NULL child is encountered.
* @return true if the tree is valid, false otherwise
*/
bool vieter_tree_node_validate(vieter_tree_node *node,
uint64_t passed_black_nodes,
uint64_t expected_black_nodes);
/*
* Balance a path of 3 nodes into a complete binary tree, with a red root and
* black children.
*/
vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node);
/*
* Ensure the tree remains a valid red-black tree after having inserting the
* node.
*/
void vieter_tree_node_balance_after_insert(vieter_tree_node *node);
/*
* Remove the given node, ensuring the tree remains a valid red-black tree.
*
* @param node node to remove. This should have at most a single child. If node
* isn't the root, this should be the right child, otherwise it can be either.
* @return root of the subtree that this function operated on. This can
* sometimes be the new root of the entire tree.
*/
vieter_tree_node *vieter_tree_node_remove_balanced(vieter_tree_node *node);
/*
* Perform a tree rotation of the subtree with the given root.
*/
vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root, bool dir);
#endif

22
src/tree/vieter_tree_internal.h 100644
View File

@ -0,0 +1,22 @@
#include "vieter_tree.h"
#include "vieter_tree_node.h"
#include <stdbool.h>
struct vieter_tree {
uint64_t size;
vieter_tree_node *root;
};
/*
* Inspect whether the tree is still a valid red-black-tree.
*
* @return true if valid, false otherwise.
*/
bool vieter_tree_validate(vieter_tree *tree);
struct vieter_tree_iterator {
vieter_tree_node *current_node;
bool started;
bool done;
};

49
src/tree/vieter_tree_iterator.c 100644
View File

@ -0,0 +1,49 @@
#include "vieter_tree.h"
#include "vieter_tree_internal.h"
vieter_tree_iterator *vieter_tree_iterator_from(vieter_tree *tree) {
vieter_tree_iterator *iter = calloc(1, sizeof(vieter_tree_iterator));
// An empty tree's iterator will be done immediately
if (tree->size == 0) {
iter->started = true;
iter->done = true;
return iter;
}
iter->current_node = tree->root;
return iter;
}
vieter_tree_error vieter_tree_iterator_next(void **out,
vieter_tree_iterator *iter) {
if (iter->done) {
return vieter_tree_iterator_done;
}
if (!iter->started) {
while (iter->current_node->children[0] != NULL) {
iter->current_node = iter->current_node->children[0];
}
iter->started = true;
}
*out = iter->current_node->data;
iter->current_node = vieter_tree_node_next(iter->current_node);
if (iter->current_node == NULL) {
iter->done = true;
}
return vieter_tree_ok;
}
void vieter_tree_iterator_free(vieter_tree_iterator **ptp) {
free(*ptp);
*ptp = NULL;
}

171
src/tree/vieter_tree_node.c 100644
View File

@ -0,0 +1,171 @@
#include "vieter_tree_node.h"
#include "vieter_tree_balancing.h"
#include <string.h>
vieter_tree_node *vieter_tree_node_init() {
return calloc(1, sizeof(vieter_tree_node));
}
void vieter_tree_node_free(vieter_tree_node *node) { free(node); }
void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,
vieter_tree_node *child) {
if (parent == NULL) {
return;
}
bool side = key > parent->key;
parent->children[side] = child;
if (child != NULL) {
child->parent = parent;
vieter_tree_node_set(child, vieter_tree_node_right, side);
}
}
void vieter_tree_node_set_children(vieter_tree_node *parent,
vieter_tree_node **children) {
memcpy(parent->children, children, 2 * sizeof(vieter_tree_node *));
for (uint8_t i = 0; i < 2; i++) {
if (parent->children[i] != NULL) {
parent->children[i]->parent = parent;
vieter_tree_node_set(parent->children[i], vieter_tree_node_right, i);
}
}
}
void vieter_tree_node_set_child(vieter_tree_node *parent,
vieter_tree_node *child, bool right) {
parent->children[right] = child;
if (child != NULL) {
child->parent = parent;
vieter_tree_node_set(child, vieter_tree_node_right, right);
}
}
vieter_tree_error vieter_tree_node_insert(vieter_tree_node *root, uint64_t key,
void *data) {
vieter_tree_node *node = root;
vieter_tree_node *parent = root;
while (node != NULL) {
if (node->key == key) {
return vieter_tree_already_present;
}
parent = node;
node = node->children[key > parent->key];
}
vieter_tree_node *new_node = vieter_tree_node_init();
new_node->key = key;
new_node->data = data;
vieter_tree_node_add_child(parent, key, new_node);
vieter_tree_node_balance_after_insert(new_node);
return vieter_tree_ok;
}
vieter_tree_error vieter_tree_node_search_node(vieter_tree_node **out,
vieter_tree_node *root,
uint64_t key) {
vieter_tree_node *node = root;
while (node != NULL) {
if (node->key == key) {
*out = node;
return vieter_tree_ok;
}
node = node->children[key > node->key];
}
return vieter_tree_not_present;
}
vieter_tree_error vieter_tree_node_search(void **out, vieter_tree_node *root,
uint64_t key) {
vieter_tree_node *target;
vieter_tree_error res = vieter_tree_node_search_node(&target, root, key);
if (res != vieter_tree_ok) {
return res;
}
*out = target->data;
return vieter_tree_ok;
}
vieter_tree_error
vieter_tree_node_remove(void **out, vieter_tree_node **root_ptr, uint64_t key) {
vieter_tree_node *target;
vieter_tree_error res = vieter_tree_node_search_node(&target, *root_ptr, key);
if (res != vieter_tree_ok) {
return res;
}
*out = target->data;
vieter_tree_node *possible_new_root;
if (target->children[0] != NULL && target->children[1] != NULL) {
vieter_tree_node *replacement = target->children[1];
while (replacement->children[0] != NULL) {
replacement = replacement->children[0];
}
target->key = replacement->key;
target->data = replacement->data;
possible_new_root = vieter_tree_node_remove_balanced(replacement);
} else {
possible_new_root = vieter_tree_node_remove_balanced(target);
}
if (possible_new_root == NULL) {
*root_ptr = NULL;
} else if (possible_new_root->parent == NULL) {
*root_ptr = possible_new_root;
}
return vieter_tree_ok;
}
void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag,
bool set) {
if (set) {
node->flags |= flag;
} else {
node->flags &= ~flag;
}
}
bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag) {
return (node->flags & flag) != 0;
}
vieter_tree_node *vieter_tree_node_next(vieter_tree_node *node) {
if (node->children[1] != NULL) {
node = node->children[1];
while (node->children[0] != NULL) {
node = node->children[0];
}
return node;
}
while (node->parent != NULL &&
vieter_tree_node_get(node, vieter_tree_node_right)) {
node = node->parent;
}
return node->parent;
}

94
src/tree/vieter_tree_node.h 100644
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@ -0,0 +1,94 @@
#ifndef VIETER_TREE_NODE
#define VIETER_TREE_NODE
#include "vieter_tree.h"
#include <stdbool.h>
#include <stdint.h>
typedef enum vieter_tree_node_flag {
vieter_tree_node_black = ((uint8_t)1) << 0,
// This flag is used to index the children array. If this flag isn't set,
// it'll evaluate to false, or index 0 in the children array.
vieter_tree_node_right = ((uint8_t)1) << 1
} vieter_tree_node_flag;
typedef struct vieter_tree_node {
uint64_t key;
void *data;
struct vieter_tree_node *parent;
struct vieter_tree_node *children[2];
uint8_t flags;
} vieter_tree_node;
/*
* Allocate a new node.
*/
vieter_tree_node *vieter_tree_node_init();
/*
* Free an allocated node.
*/
void vieter_tree_node_free(vieter_tree_node *node);
/*
* Insert a new key into the given tree.
*/
vieter_tree_error vieter_tree_node_insert(vieter_tree_node *root, uint64_t key,
void *data);
/*
* Return the node representing the requested value.
*/
vieter_tree_error vieter_tree_node_search_node(vieter_tree_node **out,
vieter_tree_node *root,
uint64_t key);
/*
* Search for the data represented by the given key.
*/
vieter_tree_error vieter_tree_node_search(void **out, vieter_tree_node *root,
uint64_t key);
/*
* Remove the data associated with the given key.
*/
vieter_tree_error
vieter_tree_node_remove(void **out, vieter_tree_node **root_ptr, uint64_t key);
/*
* Set a node's bit flag to the given value.
*/
void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag,
bool value);
/*
* Get whether a node's bit flag is set.
*/
bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag);
/*
* Add a new child to the parent, replacing either its left or right child,
* depending on the key values.
*/
void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,
vieter_tree_node *child);
/*
* Replace a node's children array.
*/
void vieter_tree_node_set_children(vieter_tree_node *parent,
vieter_tree_node **children);
/*
* Set a node's left or right child to the given node.
*/
void vieter_tree_node_set_child(vieter_tree_node *parent,
vieter_tree_node *child, bool right);
/*
* Return the in-order successor of the given node, or NULL if it's the last
* node in the tree.
*/
vieter_tree_node *vieter_tree_node_next(vieter_tree_node *node);
#endif

4
test/cron/test_parse.c
View File

@ -1,7 +1,7 @@
#include "acutest.h" #include "acutest.h"
#include "vieter_cron.h" #include "vieter_cron.h"
void test_not_allowed() { void test_illegal_expressions() {
char *expressions[] = { char *expressions[] = {
"4 *-7", "4 *-7",
"4 *-7/4", "4 *-7/4",
@ -33,6 +33,6 @@ void test_not_allowed() {
} }
TEST_LIST = { TEST_LIST = {
{"not_allowed", test_not_allowed}, {"cron illegal expressions", test_illegal_expressions},
{NULL, NULL} {NULL, NULL}
}; };

43
test/cron/test_parse_part.c 100644
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@ -0,0 +1,43 @@
#include "acutest.h"
#include "vieter_cron_parse.h"
struct parse_test {
char *part;
uint8_t min;
uint8_t max;
};
void test_illegal_parts() {
struct parse_test parts[] = {
{ "*-7", 0, 23 },
{ "*-7/4", 0, 23 },
{ "7/*", 0, 23 },
{ "/5", 0, 23 },
{ "4~6", 0, 23 },
{ "5/2-5", 0, 23 },
{ "1/2/3", 0, 23 },
{ "*5", 0, 59 },
{ "x", 0, 59 },
{ NULL, 0, 0 }
};
int i = 0;
uint64_t out;
char *s;
while (parts[i].part != NULL) {
// Function modifies string in-place
s = strdup(parts[i].part);
TEST_CHECK_(vieter_cron_expr_parse_part(&out, s, parts[i].min, parts[i].max) != vieter_cron_parse_ok, "%s (%i - %i)", parts[i].part, parts[i].min, parts[i].max);
free(s);
i++;
}
}
TEST_LIST = {
{"cron illegal parts", test_illegal_parts},
{NULL, NULL}
};

10
test/heap/test_heap.c
View File

@ -178,10 +178,10 @@ void test_pop_random() {
} }
TEST_LIST = { TEST_LIST = {
{"init", test_init}, {"heap init", test_init},
{"insert", test_insert}, {"heap insert", test_insert},
{"insert random", test_insert_random}, {"heap insert random", test_insert_random},
{"pop", test_pop}, {"heap pop", test_pop},
{"pop random", test_pop_random}, {"heap pop random", test_pop_random},
{NULL, NULL} {NULL, NULL}
}; };

2
test/heap/test_merge.c
View File

@ -23,6 +23,6 @@ void test_merge_same_order() {
} }
TEST_LIST = { TEST_LIST = {
{"merge same order", test_merge_same_order}, {"heap merge same order", test_merge_same_order},
{NULL, NULL} {NULL, NULL}
}; };

71
test/tree/test_balancing.c 100644
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@ -0,0 +1,71 @@
#include "acutest.h"
#include "vieter_tree_internal.h"
#include "vieter_tree_node.h"
#include "vieter_tree_balancing.h"
// This uses the examples from wikipedia
// https://en.wikipedia.org/wiki/Tree_rotation
void test_rotate_right() {
vieter_tree_node *a = vieter_tree_node_init();
vieter_tree_node *b = vieter_tree_node_init();
vieter_tree_node *p = vieter_tree_node_init();
vieter_tree_node_set_child(p, a, false);
vieter_tree_node_set_child(p, b, true);
vieter_tree_node *c = vieter_tree_node_init();
vieter_tree_node *q = vieter_tree_node_init();
vieter_tree_node_set_child(q, p, false);
vieter_tree_node_set_child(q, c, true);
vieter_tree_node *new_root = vieter_tree_node_rotate(q, true);
TEST_CHECK(new_root == p);
TEST_CHECK(new_root->children[0] == a);
TEST_CHECK(new_root->children[1] == q);
TEST_CHECK(new_root->children[1]->children[0] == b);
TEST_CHECK(new_root->children[1]->children[1] == c);
vieter_tree_node_free(a);
vieter_tree_node_free(b);
vieter_tree_node_free(p);
vieter_tree_node_free(c);
vieter_tree_node_free(q);
}
void test_rotate_left() {
vieter_tree_node *b = vieter_tree_node_init();
vieter_tree_node *c = vieter_tree_node_init();
vieter_tree_node *q = vieter_tree_node_init();
vieter_tree_node_set_child(q, b, false);
vieter_tree_node_set_child(q, c, true);
vieter_tree_node *a = vieter_tree_node_init();
vieter_tree_node *p = vieter_tree_node_init();
vieter_tree_node_set_child(p, a, false);
vieter_tree_node_set_child(p, q, true);
vieter_tree_node *new_root = vieter_tree_node_rotate(p, false);
TEST_CHECK(new_root == q);
TEST_CHECK(new_root->children[0] == p);
TEST_CHECK(new_root->children[1] == c);
TEST_CHECK(new_root->children[0]->children[0] == a);
TEST_CHECK(new_root->children[0]->children[1] == b);
vieter_tree_node_free(a);
vieter_tree_node_free(b);
vieter_tree_node_free(p);
vieter_tree_node_free(c);
vieter_tree_node_free(q);
}
TEST_LIST = {
{"tree rotate right", test_rotate_right},
{"tree rotate left", test_rotate_left},
{NULL, NULL}
};

72
test/tree/test_tree.c 100644
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@ -0,0 +1,72 @@
#include "acutest.h"
#include "vieter_tree_internal.h"
#define TEST_SIZE(tree, size) \
TEST_CHECK(vieter_tree_size(tree) == size); \
TEST_MSG("Size: %zu", vieter_tree_size(tree))
void test_init() {
vieter_tree *tree = vieter_tree_init();
TEST_CHECK(tree != NULL);
TEST_SIZE(tree, 0);
vieter_tree_free(tree);
}
void test_insert() {
vieter_tree *tree = vieter_tree_init();
for (uint64_t i = 0; i < 250; i++) {
TEST_CHECK(vieter_tree_insert(tree, i, (void *)i) == vieter_tree_ok);
TEST_SIZE(tree, i + 1);
TEST_CHECK(vieter_tree_validate(tree));
}
vieter_tree_iterator *iter = vieter_tree_iterator_from(tree);
void *out = NULL;
for (uint64_t i = 0; i < 250; i++) {
TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
TEST_CHECK(out == (void *)i);
TEST_CHECK(vieter_tree_insert(tree, i, NULL) == vieter_tree_already_present);
TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
out = NULL;
TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_ok);
TEST_CHECK(out == (void *)i);
}
TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_iterator_done);
vieter_tree_iterator_free(&iter);
vieter_tree_free(tree);
}
void test_remove() {
vieter_tree *tree = vieter_tree_init();
for (uint64_t i = 0; i < 250; i++) {
TEST_CHECK(vieter_tree_insert(tree, i, NULL) == vieter_tree_ok);
TEST_CHECK(vieter_tree_validate(tree));
}
void *out;
for (uint64_t i = 0; i < 250; i++) {
TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
TEST_CHECK(vieter_tree_remove(&out, tree, i) == vieter_tree_ok);
TEST_CHECK(vieter_tree_validate(tree));
TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_not_present);
TEST_SIZE(tree, 250 - i - 1);
}
vieter_tree_free(tree);
}
TEST_LIST = {
{"tree init", test_init},
{"tree insert", test_insert},
{"tree remove", test_remove},
{NULL, NULL}
};

59
test/tree/test_tree_random.c 100644
View File

@ -0,0 +1,59 @@
#include "acutest.h"
#include "vieter_tree_internal.h"
#define TEST_SIZE(tree, size) \
TEST_CHECK(vieter_tree_size(tree) == size); \
TEST_MSG("Size: %zu", vieter_tree_size(tree))
int uint64_t_compare(const void *a, const void *b) {
if ((*(uint64_t *)a) < (*(uint64_t *)b)) {
return -1;
} else if ((*(uint64_t *)a) > (*(uint64_t *)b)) {
return 1;
} else {
return 0;
}
}
void test_insert_random() {
const uint64_t n = 1000;
srand(0);
vieter_tree *tree = vieter_tree_init();
uint64_t *numbers = malloc(n * sizeof(uint64_t));
uint64_t num;
void *out = NULL;
for (uint64_t i = 0; i < n; i++) {
num = rand();
vieter_tree_insert(tree, num, (void *)num);
TEST_SIZE(tree, i + 1);
TEST_CHECK(vieter_tree_validate(tree));
TEST_CHECK(vieter_tree_search(&out, tree, num) == vieter_tree_ok);
TEST_CHECK(out == (void *)num);
out = NULL;
numbers[i] = num;
}
qsort(numbers, n, sizeof(uint64_t), uint64_t_compare);
vieter_tree_iterator *iter = vieter_tree_iterator_from(tree);
out = NULL;
for (uint64_t i = 0; i < n; i++) {
TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_ok);
TEST_CHECK(out == (void *)numbers[i]);
}
free(numbers);
vieter_tree_iterator_free(&iter);
vieter_tree_free(tree);
}
TEST_LIST = {
{"tree insert random", test_insert_random},
{NULL, NULL}
};