# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1397372091 -10800
# Node ID 4d87b0aafbb0815070ddc60d65f02b70e2469fae
# Parent  be616b58df99833026a225fda1545a8c3037e05d
forgot to add the redblack tree

diff -r be616b58df99 -r 4d87b0aafbb0 src/rbtree.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/rbtree.c	Sun Apr 13 09:54:51 2014 +0300
@@ -0,0 +1,492 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "inttypes.h"
+#include "rbtree.h"
+
+#define INT2PTR(x)	((void*)(intptr_t)(x))
+#define PTR2INT(x)	((int)(intptr_t)(x))
+
+struct rbtree {
+	struct rbnode *root;
+
+	rb_alloc_func_t alloc;
+	rb_free_func_t free;
+
+	rb_cmp_func_t cmp;
+	rb_del_func_t del;
+	void *del_cls;
+
+	struct rbnode *rstack, *iter;
+};
+
+static int cmpaddr(const void *ap, const void *bp);
+static int cmpint(const void *ap, const void *bp);
+
+static int count_nodes(struct rbnode *node);
+static void del_tree(struct rbnode *node, void (*delfunc)(struct rbnode*, void*), void *cls);
+static struct rbnode *insert(struct rbtree *rb, struct rbnode *tree, void *key, void *data);
+static struct rbnode *delete(struct rbtree *rb, struct rbnode *tree, void *key);
+/*static struct rbnode *find(struct rbtree *rb, struct rbnode *node, void *key);*/
+static void traverse(struct rbnode *node, void (*func)(struct rbnode*, void*), void *cls);
+
+struct rbtree *rb_create(rb_cmp_func_t cmp_func)
+{
+	struct rbtree *rb;
+
+	if(!(rb = malloc(sizeof *rb))) {
+		return 0;
+	}
+	if(rb_init(rb, cmp_func) == -1) {
+		free(rb);
+		return 0;
+	}
+	return rb;
+}
+
+void rb_free(struct rbtree *rb)
+{
+	rb_destroy(rb);
+	free(rb);
+}
+
+
+int rb_init(struct rbtree *rb, rb_cmp_func_t cmp_func)
+{
+	memset(rb, 0, sizeof *rb);
+
+	if(cmp_func == RB_KEY_INT) {
+		rb->cmp = cmpint;
+	} else if(cmp_func == RB_KEY_STRING) {
+		rb->cmp = (rb_cmp_func_t)strcmp;
+	} else {
+		rb->cmp = cmpaddr;
+	}
+
+	rb->alloc = malloc;
+	rb->free = free;
+	return 0;
+}
+
+void rb_destroy(struct rbtree *rb)
+{
+	del_tree(rb->root, rb->del, rb->del_cls);
+}
+
+void rb_set_allocator(struct rbtree *rb, rb_alloc_func_t alloc, rb_free_func_t free)
+{
+	rb->alloc = alloc;
+	rb->free = free;
+}
+
+
+void rb_set_compare_func(struct rbtree *rb, rb_cmp_func_t func)
+{
+	rb->cmp = func;
+}
+
+void rb_set_delete_func(struct rbtree *rb, rb_del_func_t func, void *cls)
+{
+	rb->del = func;
+	rb->del_cls = cls;
+}
+
+
+void rb_clear(struct rbtree *rb)
+{
+	del_tree(rb->root, rb->del, rb->del_cls);
+	rb->root = 0;
+}
+
+int rb_copy(struct rbtree *dest, struct rbtree *src)
+{
+	struct rbnode *node;
+
+	rb_clear(dest);
+	rb_begin(src);
+	while((node = rb_next(src))) {
+		if(rb_insert(dest, node->key, node->data) == -1) {
+			return -1;
+		}
+	}
+	return 0;
+}
+
+int rb_size(struct rbtree *rb)
+{
+	return count_nodes(rb->root);
+}
+
+int rb_insert(struct rbtree *rb, void *key, void *data)
+{
+	rb->root = insert(rb, rb->root, key, data);
+	rb->root->red = 0;
+	return 0;
+}
+
+int rb_inserti(struct rbtree *rb, int key, void *data)
+{
+	rb->root = insert(rb, rb->root, INT2PTR(key), data);
+	rb->root->red = 0;
+	return 0;
+}
+
+
+int rb_delete(struct rbtree *rb, void *key)
+{
+	rb->root = delete(rb, rb->root, key);
+	rb->root->red = 0;
+	return 0;
+}
+
+int rb_deletei(struct rbtree *rb, int key)
+{
+	rb->root = delete(rb, rb->root, INT2PTR(key));
+	rb->root->red = 0;
+	return 0;
+}
+
+
+struct rbnode *rb_find(struct rbtree *rb, void *key)
+{
+	struct rbnode *node = rb->root;
+
+	while(node) {
+		int cmp = rb->cmp(key, node->key);
+		if(cmp == 0) {
+			return node;
+		}
+		node = cmp < 0 ? node->left : node->right;
+	}
+	return 0;
+}
+
+struct rbnode *rb_findi(struct rbtree *rb, int key)
+{
+	return rb_find(rb, INT2PTR(key));
+}
+
+
+void rb_foreach(struct rbtree *rb, void (*func)(struct rbnode*, void*), void *cls)
+{
+	traverse(rb->root, func, cls);
+}
+
+
+struct rbnode *rb_root(struct rbtree *rb)
+{
+	return rb->root;
+}
+
+void rb_begin(struct rbtree *rb)
+{
+	rb->rstack = 0;
+	rb->iter = rb->root;
+}
+
+#define push(sp, x)		((x)->next = (sp), (sp) = (x))
+#define pop(sp)			((sp) = (sp)->next)
+#define top(sp)			(sp)
+
+struct rbnode *rb_next(struct rbtree *rb)
+{
+	struct rbnode *res = 0;
+
+	while(rb->rstack || rb->iter) {
+		if(rb->iter) {
+			push(rb->rstack, rb->iter);
+			rb->iter = rb->iter->left;
+		} else {
+			rb->iter = top(rb->rstack);
+			pop(rb->rstack);
+			res = rb->iter;
+			rb->iter = rb->iter->right;
+			break;
+		}
+	}
+	return res;
+}
+
+void *rb_node_key(struct rbnode *node)
+{
+	return node ? node->key : 0;
+}
+
+int rb_node_keyi(struct rbnode *node)
+{
+	return node ? PTR2INT(node->key) : 0;
+}
+
+void *rb_node_data(struct rbnode *node)
+{
+	return node ? node->data : 0;
+}
+
+static int cmpaddr(const void *ap, const void *bp)
+{
+	return ap < bp ? -1 : (ap > bp ? 1 : 0);
+}
+
+static int cmpint(const void *ap, const void *bp)
+{
+	return PTR2INT(ap) - PTR2INT(bp);
+}
+
+
+/* ---- left-leaning 2-3 red-black implementation ---- */
+
+/* helper prototypes */
+static int is_red(struct rbnode *tree);
+static void color_flip(struct rbnode *tree);
+static struct rbnode *rot_left(struct rbnode *a);
+static struct rbnode *rot_right(struct rbnode *a);
+static struct rbnode *find_min(struct rbnode *tree);
+static struct rbnode *del_min(struct rbtree *rb, struct rbnode *tree);
+/*static struct rbnode *move_red_right(struct rbnode *tree);*/
+static struct rbnode *move_red_left(struct rbnode *tree);
+static struct rbnode *fix_up(struct rbnode *tree);
+
+static int count_nodes(struct rbnode *node)
+{
+	if(!node)
+		return 0;
+
+	return 1 + count_nodes(node->left) + count_nodes(node->right);
+}
+
+static void del_tree(struct rbnode *node, rb_del_func_t delfunc, void *cls)
+{
+	if(!node)
+		return;
+
+	del_tree(node->left, delfunc, cls);
+	del_tree(node->right, delfunc, cls);
+
+	if(delfunc) {
+		delfunc(node, cls);
+	}
+	free(node);
+}
+
+static struct rbnode *insert(struct rbtree *rb, struct rbnode *tree, void *key, void *data)
+{
+	int cmp;
+
+	if(!tree) {
+		struct rbnode *node = rb->alloc(sizeof *node);
+		node->red = 1;
+		node->key = key;
+		node->data = data;
+		node->left = node->right = 0;
+		return node;
+	}
+
+	cmp = rb->cmp(key, tree->key);
+
+	if(cmp < 0) {
+		tree->left = insert(rb, tree->left, key, data);
+	} else if(cmp > 0) {
+		tree->right = insert(rb, tree->right, key, data);
+	} else {
+		tree->data = data;
+	}
+
+	/* fix right-leaning reds */
+	if(is_red(tree->right)) {
+		tree = rot_left(tree);
+	}
+	/* fix two reds in a row */
+	if(is_red(tree->left) && is_red(tree->left->left)) {
+		tree = rot_right(tree);
+	}
+
+	/* if 4-node, split it by color inversion */
+	if(is_red(tree->left) && is_red(tree->right)) {
+		color_flip(tree);
+	}
+
+	return tree;
+}
+
+static struct rbnode *delete(struct rbtree *rb, struct rbnode *tree, void *key)
+{
+	int cmp;
+
+	if(!tree) {
+		return 0;
+	}
+
+	cmp = rb->cmp(key, tree->key);
+
+	if(cmp < 0) {
+		if(!is_red(tree->left) && !is_red(tree->left->left)) {
+			tree = move_red_left(tree);
+		}
+		tree->left = delete(rb, tree->left, key);
+	} else {
+		/* need reds on the right */
+		if(is_red(tree->left)) {
+			tree = rot_right(tree);
+		}
+
+		/* found it at the bottom (XXX what certifies left is null?) */
+		if(cmp == 0 && !tree->right) {
+			if(rb->del) {
+				rb->del(tree, rb->del_cls);
+			}
+			rb->free(tree);
+			return 0;
+		}
+
+		if(!is_red(tree->right) && !is_red(tree->right->left)) {
+			tree = move_red_left(tree);
+		}
+
+		if(key == tree->key) {
+			struct rbnode *rmin = find_min(tree->right);
+			tree->key = rmin->key;
+			tree->data = rmin->data;
+			tree->right = del_min(rb, tree->right);
+		} else {
+			tree->right = delete(rb, tree->right, key);
+		}
+	}
+
+	return fix_up(tree);
+}
+
+/*static struct rbnode *find(struct rbtree *rb, struct rbnode *node, void *key)
+{
+	int cmp;
+
+	if(!node)
+		return 0;
+
+	if((cmp = rb->cmp(key, node->key)) == 0) {
+		return node;
+	}
+	return find(rb, cmp < 0 ? node->left : node->right, key);
+}*/
+
+static void traverse(struct rbnode *node, void (*func)(struct rbnode*, void*), void *cls)
+{
+	if(!node)
+		return;
+
+	traverse(node->left, func, cls);
+	func(node, cls);
+	traverse(node->right, func, cls);
+}
+
+/* helpers */
+
+static int is_red(struct rbnode *tree)
+{
+	return tree && tree->red;
+}
+
+static void color_flip(struct rbnode *tree)
+{
+	tree->red = !tree->red;
+	tree->left->red = !tree->left->red;
+	tree->right->red = !tree->right->red;
+}
+
+static struct rbnode *rot_left(struct rbnode *a)
+{
+	struct rbnode *b = a->right;
+	a->right = b->left;
+	b->left = a;
+	b->red = a->red;
+	a->red = 1;
+	return b;
+}
+
+static struct rbnode *rot_right(struct rbnode *a)
+{
+	struct rbnode *b = a->left;
+	a->left = b->right;
+	b->right = a;
+	b->red = a->red;
+	a->red = 1;
+	return b;
+}
+
+static struct rbnode *find_min(struct rbnode *tree)
+{
+	if(!tree)
+		return 0;
+
+	while(tree->left) {
+		tree = tree->left;
+	}
+	return tree;
+}
+
+static struct rbnode *del_min(struct rbtree *rb, struct rbnode *tree)
+{
+	if(!tree->left) {
+		if(rb->del) {
+			rb->del(tree->left, rb->del_cls);
+		}
+		rb->free(tree->left);
+		return 0;
+	}
+
+	/* make sure we've got red (3/4-nodes) at the left side so we can delete at the bottom */
+	if(!is_red(tree->left) && !is_red(tree->left->left)) {
+		tree = move_red_left(tree);
+	}
+	tree->left = del_min(rb, tree->left);
+
+	/* fix right-reds, red-reds, and split 4-nodes on the way up */
+	return fix_up(tree);
+}
+
+#if 0
+/* push a red link on this node to the right */
+static struct rbnode *move_red_right(struct rbnode *tree)
+{
+	/* flipping it makes both children go red, so we have a red to the right */
+	color_flip(tree);
+
+	/* if after the flip we've got a red-red situation to the left, fix it */
+	if(is_red(tree->left->left)) {
+		tree = rot_right(tree);
+		color_flip(tree);
+	}
+	return tree;
+}
+#endif
+
+/* push a red link on this node to the left */
+static struct rbnode *move_red_left(struct rbnode *tree)
+{
+	/* flipping it makes both children go red, so we have a red to the left */
+	color_flip(tree);
+
+	/* if after the flip we've got a red-red on the right-left, fix it */
+	if(is_red(tree->right->left)) {
+		tree->right = rot_right(tree->right);
+		tree = rot_left(tree);
+		color_flip(tree);
+	}
+	return tree;
+}
+
+static struct rbnode *fix_up(struct rbnode *tree)
+{
+	/* fix right-leaning */
+	if(is_red(tree->right)) {
+		tree = rot_left(tree);
+	}
+	/* change invalid red-red pairs into a proper 4-node */
+	if(is_red(tree->left) && is_red(tree->left->left)) {
+		tree = rot_right(tree);
+	}
+	/* split 4-nodes */
+	if(is_red(tree->left) && is_red(tree->right)) {
+		color_flip(tree);
+	}
+	return tree;
+}
diff -r be616b58df99 -r 4d87b0aafbb0 src/rbtree.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/rbtree.h	Sun Apr 13 09:54:51 2014 +0300
@@ -0,0 +1,71 @@
+#ifndef RBTREE_H_
+#define RBTREE_H_
+
+struct rbtree;
+
+
+struct rbnode {
+	void *key, *data;
+	int red;
+	struct rbnode *left, *right;
+	struct rbnode *next;	/* for iterator stack */
+};
+
+
+typedef void *(*rb_alloc_func_t)(size_t);
+typedef void (*rb_free_func_t)(void*);
+
+typedef int (*rb_cmp_func_t)(const void*, const void*);
+typedef void (*rb_del_func_t)(struct rbnode*, void*);
+
+#define RB_KEY_ADDR		(rb_cmp_func_t)(0)
+#define RB_KEY_INT		(rb_cmp_func_t)(1)
+#define RB_KEY_STRING	(rb_cmp_func_t)(3)
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct rbtree *rb_create(rb_cmp_func_t cmp_func);
+void rb_free(struct rbtree *rb);
+
+int rb_init(struct rbtree *rb, rb_cmp_func_t cmp_func);
+void rb_destroy(struct rbtree *rb);
+
+void rb_set_allocator(struct rbtree *rb, rb_alloc_func_t alloc, rb_free_func_t free);
+void rb_set_compare_func(struct rbtree *rb, rb_cmp_func_t func);
+void rb_set_delete_func(struct rbtree *rb, rb_del_func_t func, void *cls);
+/* TODO add user deep copy function */
+
+void rb_clear(struct rbtree *rb);
+int rb_copy(struct rbtree *dest, struct rbtree *src);
+
+int rb_size(struct rbtree *rb);
+
+int rb_insert(struct rbtree *rb, void *key, void *data);
+int rb_inserti(struct rbtree *rb, int key, void *data);
+
+int rb_delete(struct rbtree *rb, void *key);
+int rb_deletei(struct rbtree *rb, int key);
+
+struct rbnode *rb_find(struct rbtree *rb, void *key);
+struct rbnode *rb_findi(struct rbtree *rb, int key);
+
+void rb_foreach(struct rbtree *rb, void (*func)(struct rbnode*, void*), void *cls);
+
+struct rbnode *rb_root(struct rbtree *rb);
+
+void rb_begin(struct rbtree *rb);
+struct rbnode *rb_next(struct rbtree *rb);
+
+void *rb_node_key(struct rbnode *node);
+int rb_node_keyi(struct rbnode *node);
+void *rb_node_data(struct rbnode *node);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif	/* RBTREE_H_ */