/*****************************************************************************\ * Copyright (c) Athena Dev Teams - Licensed under GNU GPL * For more information, see LICENCE in the main folder * * This file is separated in five sections: * (1) Private typedefs, enums, structures, defines and gblobal variables * (2) Private functions * (3) Protected functions used internally * (4) Protected functions used in the interface of the database * (5) Public functions * * The databases are structured as a hashtable of RED-BLACK trees. * * Properties of the RED-BLACK trees being used: * 1. The value of any node is greater than the value of its left child and * less than the value of its right child. * 2. Every node is colored either RED or BLACK. * 3. Every red node that is not a leaf has only black children. * 4. Every path from the root to a leaf contains the same number of black * nodes. * 5. The root node is black. * An n node in a RED-BLACK tree has the property that its * height is O(lg(n)). * Another important property is that after adding a node to a RED-BLACK * tree, the tree can be readjusted in O(lg(n)) time. * Similarly, after deleting a node from a RED-BLACK tree, the tree can be * readjusted in O(lg(n)) time. * {@link http://www.cs.mcgill.ca/~cs251/OldCourses/1997/topic18/} * * How to add new database types: * 1. Add the identifier of the new database type to the enum DBType * 2. If not already there, add the data type of the key to the union DBKey * 3. If the key can be considered NULL, update the function db_is_key_null * 4. If the key can be duplicated, update the functions db_dup_key and * db_dup_key_free * 5. Create a comparator and update the function db_default_cmp * 6. Create a hasher and update the function db_default_hash * 7. If the new database type requires or does not support some options, * update the function db_fix_options * * TODO: * - create test cases to test the database system thoroughly * - finish this header describing the database system * - create custom database allocator * - make the system thread friendly * - change the structure of the database to T-Trees * - create a db that organizes itself by splaying * * HISTORY: * 2013/04/27 - Added ERS to speed up iterator memory allocation [Ind/Hercules] * 2012/03/09 - Added enum for data types (int, uint, void*) * 2008/02/19 - Fixed db_obj_get not handling deleted entries correctly. * 2007/11/09 - Added an iterator to the database. * 2006/12/21 - Added 1-node cache to the database. * 2.1 (Athena build #???#) - Portability fix * - Fixed the portability of casting to union and added the functions * ensure and clear to the database. * 2.0 (Athena build 4859) - Transition version * - Almost everything recoded with a strategy similar to objects, * database structure is maintained. * 1.0 (up to Athena build 4706) * - Previous database system. * * @version 2006/12/21 * @author Athena Dev team * @encoding US-ASCII * @see #db.h \*****************************************************************************/ #include #include #include "db.h" #include "../common/mmo.h" #include "../common/malloc.h" #include "../common/showmsg.h" #include "../common/ers.h" #include "../common/strlib.h" /*****************************************************************************\ * (1) Private typedefs, enums, structures, defines and global variables of * * the database system. * * DB_ENABLE_STATS - Define to enable database statistics. * * HASH_SIZE - Define with the size of the hashtable. * * DBNColor - Enumeration of colors of the nodes. * * DBNode - Structure of a node in RED-BLACK trees. * * struct db_free - Structure that holds a deleted node to be freed. * * DBMap_impl - Struture of the database. * * stats - Statistics about the database system. * \*****************************************************************************/ /** * If defined statistics about database nodes, database creating/destruction * and function usage are keept and displayed when finalizing the database * system. * WARNING: This adds overhead to every database operation (not shure how much). * @private * @see #DBStats * @see #stats * @see #db_final(void) */ //#define DB_ENABLE_STATS /** * Size of the hashtable in the database. * @private * @see DBMap_impl#ht */ #define HASH_SIZE (256+27) /** * The color of individual nodes. * @private * @see struct dbn */ typedef enum node_color { RED, BLACK } node_color; /** * A node in a RED-BLACK tree of the database. * @param parent Parent node * @param left Left child node * @param right Right child node * @param key Key of this database entry * @param data Data of this database entry * @param deleted If the node is deleted * @param color Color of the node * @private * @see DBMap_impl#ht */ typedef struct dbn { // Tree structure struct dbn *parent; struct dbn *left; struct dbn *right; // Node data DBKey key; DBData data; // Other node_color color; unsigned deleted : 1; } *DBNode; /** * Structure that holds a deleted node. * @param node Deleted node * @param root Address to the root of the tree * @private * @see DBMap_impl#free_list */ struct db_free { DBNode node; DBNode *root; }; /** * Complete database structure. * @param vtable Interface of the database * @param alloc_file File where the database was allocated * @param alloc_line Line in the file where the database was allocated * @param free_list Array of deleted nodes to be freed * @param free_count Number of deleted nodes in free_list * @param free_max Current maximum capacity of free_list * @param free_lock Lock for freeing the nodes * @param nodes Manager of reusable tree nodes * @param cmp Comparator of the database * @param hash Hasher of the database * @param release Releaser of the database * @param ht Hashtable of RED-BLACK trees * @param type Type of the database * @param options Options of the database * @param item_count Number of items in the database * @param maxlen Maximum length of strings in DB_STRING and DB_ISTRING databases * @param global_lock Global lock of the database * @private * @see #db_alloc(const char*,int,DBType,DBOptions,unsigned short) */ typedef struct DBMap_impl { // Database interface struct DBMap vtable; // File and line of allocation const char *alloc_file; int alloc_line; // Lock system struct db_free *free_list; unsigned int free_count; unsigned int free_max; unsigned int free_lock; // Other ERS nodes; DBComparator cmp; DBHasher hash; DBReleaser release; DBNode ht[HASH_SIZE]; DBNode cache; DBType type; DBOptions options; uint32 item_count; unsigned short maxlen; unsigned global_lock : 1; } DBMap_impl; /** * Complete iterator structure. * @param vtable Interface of the iterator * @param db Parent database * @param ht_index Current index of the hashtable * @param node Current node * @private * @see #DBIterator * @see #DBMap_impl * @see #DBNode */ typedef struct DBIterator_impl { // Iterator interface struct DBIterator vtable; DBMap_impl* db; int ht_index; DBNode node; } DBIterator_impl; #if defined(DB_ENABLE_STATS) /** * Structure with what is counted when the database statistics are enabled. * @private * @see #DB_ENABLE_STATS * @see #stats */ static struct db_stats { // Node alloc/free uint32 db_node_alloc; uint32 db_node_free; // Database creating/destruction counters uint32 db_int_alloc; uint32 db_uint_alloc; uint32 db_string_alloc; uint32 db_istring_alloc; uint32 db_int_destroy; uint32 db_uint_destroy; uint32 db_string_destroy; uint32 db_istring_destroy; // Function usage counters uint32 db_rotate_left; uint32 db_rotate_right; uint32 db_rebalance; uint32 db_rebalance_erase; uint32 db_is_key_null; uint32 db_dup_key; uint32 db_dup_key_free; uint32 db_free_add; uint32 db_free_remove; uint32 db_free_lock; uint32 db_free_unlock; uint32 db_int_cmp; uint32 db_uint_cmp; uint32 db_string_cmp; uint32 db_istring_cmp; uint32 db_int_hash; uint32 db_uint_hash; uint32 db_string_hash; uint32 db_istring_hash; uint32 db_release_nothing; uint32 db_release_key; uint32 db_release_data; uint32 db_release_both; uint32 dbit_first; uint32 dbit_last; uint32 dbit_next; uint32 dbit_prev; uint32 dbit_exists; uint32 dbit_remove; uint32 dbit_destroy; uint32 db_iterator; uint32 db_exists; uint32 db_get; uint32 db_getall; uint32 db_vgetall; uint32 db_ensure; uint32 db_vensure; uint32 db_put; uint32 db_remove; uint32 db_foreach; uint32 db_vforeach; uint32 db_clear; uint32 db_vclear; uint32 db_destroy; uint32 db_vdestroy; uint32 db_size; uint32 db_type; uint32 db_options; uint32 db_fix_options; uint32 db_default_cmp; uint32 db_default_hash; uint32 db_default_release; uint32 db_custom_release; uint32 db_alloc; uint32 db_i2key; uint32 db_ui2key; uint32 db_str2key; uint32 db_i2data; uint32 db_ui2data; uint32 db_ptr2data; uint32 db_data2i; uint32 db_data2ui; uint32 db_data2ptr; uint32 db_init; uint32 db_final; } stats = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; #define DB_COUNTSTAT(token) do { if (stats. ## token != UINT32_MAX) ++stats. ## token ; } while(0) #else /* !defined(DB_ENABLE_STATS) */ #define DB_COUNTSTAT(token) #endif /* !defined(DB_ENABLE_STATS) */ /* [Ind/Hercules] */ struct eri *db_iterator_ers; struct eri *db_alloc_ers; /*****************************************************************************\ * (2) Section of private functions used by the database system. * * db_rotate_left - Rotate a tree node to the left. * * db_rotate_right - Rotate a tree node to the right. * * db_rebalance - Rebalance the tree. * * db_rebalance_erase - Rebalance the tree after a BLACK node was erased. * * db_is_key_null - Returns not 0 if the key is considered NULL. * * db_dup_key - Duplicate a key for internal use. * * db_dup_key_free - Free the duplicated key. * * db_free_add - Add a node to the free_list of a database. * * db_free_remove - Remove a node from the free_list of a database. * * db_free_lock - Increment the free_lock of a database. * * db_free_unlock - Decrement the free_lock of a database. * * If it was the last lock, frees the nodes in free_list. * * NOTE: Keeps the database trees balanced. * \*****************************************************************************/ /** * Rotate a node to the left. * @param node Node to be rotated * @param root Pointer to the root of the tree * @private * @see #db_rebalance(DBNode,DBNode *) * @see #db_rebalance_erase(DBNode,DBNode *) */ static void db_rotate_left(DBNode node, DBNode *root) { DBNode y = node->right; DB_COUNTSTAT(db_rotate_left); // put the left of y at the right of node node->right = y->left; if (y->left) y->left->parent = node; y->parent = node->parent; // link y and node's parent if (node == *root) { *root = y; // node was root } else if (node == node->parent->left) { node->parent->left = y; // node was at the left } else { node->parent->right = y; // node was at the right } // put node at the left of y y->left = node; node->parent = y; } /** * Rotate a node to the right * @param node Node to be rotated * @param root Pointer to the root of the tree * @private * @see #db_rebalance(DBNode,DBNode *) * @see #db_rebalance_erase(DBNode,DBNode *) */ static void db_rotate_right(DBNode node, DBNode *root) { DBNode y = node->left; DB_COUNTSTAT(db_rotate_right); // put the right of y at the left of node node->left = y->right; if (y->right != 0) y->right->parent = node; y->parent = node->parent; // link y and node's parent if (node == *root) { *root = y; // node was root } else if (node == node->parent->right) { node->parent->right = y; // node was at the right } else { node->parent->left = y; // node was at the left } // put node at the right of y y->right = node; node->parent = y; } /** * Rebalance the RED-BLACK tree. * Called when the node and it's parent are both RED. * @param node Node to be rebalanced * @param root Pointer to the root of the tree * @private * @see #db_rotate_left(DBNode,DBNode *) * @see #db_rotate_right(DBNode,DBNode *) * @see #db_obj_put(DBMap*,DBKey,DBData) */ static void db_rebalance(DBNode node, DBNode *root) { DBNode y; DB_COUNTSTAT(db_rebalance); // Restore the RED-BLACK properties node->color = RED; while (node != *root && node->parent->color == RED) { if (node->parent == node->parent->parent->left) { // If node's parent is a left, y is node's right 'uncle' y = node->parent->parent->right; if (y && y->color == RED) { // case 1 // change the colors and move up the tree node->parent->color = BLACK; y->color = BLACK; node->parent->parent->color = RED; node = node->parent->parent; } else { if (node == node->parent->right) { // case 2 // move up and rotate node = node->parent; db_rotate_left(node, root); } // case 3 node->parent->color = BLACK; node->parent->parent->color = RED; db_rotate_right(node->parent->parent, root); } } else { // If node's parent is a right, y is node's left 'uncle' y = node->parent->parent->left; if (y && y->color == RED) { // case 1 // change the colors and move up the tree node->parent->color = BLACK; y->color = BLACK; node->parent->parent->color = RED; node = node->parent->parent; } else { if (node == node->parent->left) { // case 2 // move up and rotate node = node->parent; db_rotate_right(node, root); } // case 3 node->parent->color = BLACK; node->parent->parent->color = RED; db_rotate_left(node->parent->parent, root); } } } (*root)->color = BLACK; // the root can and should always be black } /** * Erase a node from the RED-BLACK tree, keeping the tree balanced. * @param node Node to be erased from the tree * @param root Root of the tree * @private * @see #db_rotate_left(DBNode,DBNode *) * @see #db_rotate_right(DBNode,DBNode *) * @see #db_free_unlock(DBMap_impl*) */ static void db_rebalance_erase(DBNode node, DBNode *root) { DBNode y = node; DBNode x = NULL; DBNode x_parent = NULL; DBNode w; DB_COUNTSTAT(db_rebalance_erase); // Select where to change the tree if (y->left == NULL) { // no left x = y->right; } else if (y->right == NULL) { // no right x = y->left; } else { // both exist, go to the leftmost node of the right sub-tree y = y->right; while (y->left != NULL) y = y->left; x = y->right; } // Remove the node from the tree if (y != node) { // both childs existed // put the left of 'node' in the left of 'y' node->left->parent = y; y->left = node->left; // 'y' is not the direct child of 'node' if (y != node->right) { // put 'x' in the old position of 'y' x_parent = y->parent; if (x) x->parent = y->parent; y->parent->left = x; // put the right of 'node' in 'y' y->right = node->right; node->right->parent = y; // 'y' is a direct child of 'node' } else { x_parent = y; } // link 'y' and the parent of 'node' if (*root == node) { *root = y; // 'node' was the root } else if (node->parent->left == node) { node->parent->left = y; // 'node' was at the left } else { node->parent->right = y; // 'node' was at the right } y->parent = node->parent; // switch colors { node_color tmp = y->color; y->color = node->color; node->color = tmp; } y = node; } else { // one child did not exist // put x in node's position x_parent = y->parent; if (x) x->parent = y->parent; // link x and node's parent if (*root == node) { *root = x; // node was the root } else if (node->parent->left == node) { node->parent->left = x; // node was at the left } else { node->parent->right = x; // node was at the right } } // Restore the RED-BLACK properties if (y->color != RED) { while (x != *root && (x == NULL || x->color == BLACK)) { if (x == x_parent->left) { w = x_parent->right; if (w->color == RED) { w->color = BLACK; x_parent->color = RED; db_rotate_left(x_parent, root); w = x_parent->right; } if ((w->left == NULL || w->left->color == BLACK) && (w->right == NULL || w->right->color == BLACK)) { w->color = RED; x = x_parent; x_parent = x_parent->parent; } else { if (w->right == NULL || w->right->color == BLACK) { if (w->left) w->left->color = BLACK; w->color = RED; db_rotate_right(w, root); w = x_parent->right; } w->color = x_parent->color; x_parent->color = BLACK; if (w->right) w->right->color = BLACK; db_rotate_left(x_parent, root); break; } } else { w = x_parent->left; if (w->color == RED) { w->color = BLACK; x_parent->color = RED; db_rotate_right(x_parent, root); w = x_parent->left; } if ((w->right == NULL || w->right->color == BLACK) && (w->left == NULL || w->left->color == BLACK)) { w->color = RED; x = x_parent; x_parent = x_parent->parent; } else { if (w->left == NULL || w->left->color == BLACK) { if (w->right) w->right->color = BLACK; w->color = RED; db_rotate_left(w, root); w = x_parent->left; } w->color = x_parent->color; x_parent->color = BLACK; if (w->left) w->left->color = BLACK; db_rotate_right(x_parent, root); break; } } } if (x) x->color = BLACK; } } /** * Returns not 0 if the key is considered to be NULL. * @param type Type of database * @param key Key being tested * @return not 0 if considered NULL, 0 otherwise * @private * @see #db_obj_get(DBMap*,DBKey) * @see #db_obj_put(DBMap*,DBKey,DBData) * @see #db_obj_remove(DBMap*,DBKey) */ static int db_is_key_null(DBType type, DBKey key) { DB_COUNTSTAT(db_is_key_null); switch (type) { case DB_STRING: case DB_ISTRING: return (key.str == NULL); default: // Not a pointer return 0; } } /** * Duplicate the key used in the database. * @param db Database the key is being used in * @param key Key to be duplicated * @param Duplicated key * @private * @see #db_free_add(DBMap_impl*,DBNode,DBNode *) * @see #db_free_remove(DBMap_impl*,DBNode) * @see #db_obj_put(DBMap*,DBKey,void *) * @see #db_dup_key_free(DBMap_impl*,DBKey) */ static DBKey db_dup_key(DBMap_impl* db, DBKey key) { char *str; size_t len; DB_COUNTSTAT(db_dup_key); switch (db->type) { case DB_STRING: case DB_ISTRING: len = strnlen(key.str, db->maxlen); str = (char*)aMalloc(len + 1); memcpy(str, key.str, len); str[len] = '\0'; key.str = str; return key; default: return key; } } /** * Free a key duplicated by db_dup_key. * @param db Database the key is being used in * @param key Key to be freed * @private * @see #db_dup_key(DBMap_impl*,DBKey) */ static void db_dup_key_free(DBMap_impl* db, DBKey key) { DB_COUNTSTAT(db_dup_key_free); switch (db->type) { case DB_STRING: case DB_ISTRING: aFree((char*)key.str); return; default: return; } } /** * Add a node to the free_list of the database. * Marks the node as deleted. * If the key isn't duplicated, the key is duplicated and released. * @param db Target database * @param root Root of the tree from the node * @param node Target node * @private * @see #struct db_free * @see DBMap_impl#free_list * @see DBMap_impl#free_count * @see DBMap_impl#free_max * @see #db_obj_remove(DBMap*,DBKey) * @see #db_free_remove(DBMap_impl*,DBNode) */ static void db_free_add(DBMap_impl* db, DBNode node, DBNode *root) { DBKey old_key; DB_COUNTSTAT(db_free_add); if (db->free_lock == (unsigned int)~0) { ShowFatalError("db_free_add: free_lock overflow\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); exit(EXIT_FAILURE); } if (!(db->options&DB_OPT_DUP_KEY)) { // Make sure we have a key until the node is freed old_key = node->key; node->key = db_dup_key(db, node->key); db->release(old_key, node->data, DB_RELEASE_KEY); } if (db->free_count == db->free_max) { // No more space, expand free_list db->free_max = (db->free_max<<2) +3; // = db->free_max*4 +3 if (db->free_max <= db->free_count) { if (db->free_count == (unsigned int)~0) { ShowFatalError("db_free_add: free_count overflow\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); exit(EXIT_FAILURE); } db->free_max = (unsigned int)~0; } RECREATE(db->free_list, struct db_free, db->free_max); } node->deleted = 1; db->free_list[db->free_count].node = node; db->free_list[db->free_count].root = root; db->free_count++; db->item_count--; } /** * Remove a node from the free_list of the database. * Marks the node as not deleted. * NOTE: Frees the duplicated key of the node. * @param db Target database * @param node Node being removed from free_list * @private * @see #struct db_free * @see DBMap_impl#free_list * @see DBMap_impl#free_count * @see #db_obj_put(DBMap*,DBKey,DBData) * @see #db_free_add(DBMap_impl*,DBNode*,DBNode) */ static void db_free_remove(DBMap_impl* db, DBNode node) { unsigned int i; DB_COUNTSTAT(db_free_remove); for (i = 0; i < db->free_count; i++) { if (db->free_list[i].node == node) { if (i < db->free_count -1) // copy the last item to where the removed one was memcpy(&db->free_list[i], &db->free_list[db->free_count -1], sizeof(struct db_free)); db_dup_key_free(db, node->key); break; } } node->deleted = 0; if (i == db->free_count) { ShowWarning("db_free_remove: node was not found - database allocated at %s:%d\n", db->alloc_file, db->alloc_line); } else { db->free_count--; } db->item_count++; } /** * Increment the free_lock of the database. * @param db Target database * @private * @see DBMap_impl#free_lock * @see #db_unlock(DBMap_impl*) */ static void db_free_lock(DBMap_impl* db) { DB_COUNTSTAT(db_free_lock); if (db->free_lock == (unsigned int)~0) { ShowFatalError("db_free_lock: free_lock overflow\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); exit(EXIT_FAILURE); } db->free_lock++; } /** * Decrement the free_lock of the database. * If it was the last lock, frees the nodes of the database. * Keeps the tree balanced. * NOTE: Frees the duplicated keys of the nodes * @param db Target database * @private * @see DBMap_impl#free_lock * @see #db_free_dbn(DBNode) * @see #db_lock(DBMap_impl*) */ static void db_free_unlock(DBMap_impl* db) { unsigned int i; DB_COUNTSTAT(db_free_unlock); if (db->free_lock == 0) { ShowWarning("db_free_unlock: free_lock was already 0\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); } else { db->free_lock--; } if (db->free_lock) return; // Not last lock for (i = 0; i < db->free_count ; i++) { db_rebalance_erase(db->free_list[i].node, db->free_list[i].root); db_dup_key_free(db, db->free_list[i].node->key); DB_COUNTSTAT(db_node_free); ers_free(db->nodes, db->free_list[i].node); } db->free_count = 0; } /*****************************************************************************\ * (3) Section of protected functions used internally. * * NOTE: the protected functions used in the database interface are in the * * next section. * * db_int_cmp - Default comparator for DB_INT databases. * * db_uint_cmp - Default comparator for DB_UINT databases. * * db_string_cmp - Default comparator for DB_STRING databases. * * db_istring_cmp - Default comparator for DB_ISTRING databases. * * db_int_hash - Default hasher for DB_INT databases. * * db_uint_hash - Default hasher for DB_UINT databases. * * db_string_hash - Default hasher for DB_STRING databases. * * db_istring_hash - Default hasher for DB_ISTRING databases. * * db_release_nothing - Releaser that releases nothing. * * db_release_key - Releaser that only releases the key. * * db_release_data - Releaser that only releases the data. * * db_release_both - Releaser that releases key and data. * \*****************************************************************************/ /** * Default comparator for DB_INT databases. * Compares key1 to key2. * Return 0 if equal, negative if lower and positive if higher. * maxlen is ignored. * @param key1 Key to be compared * @param key2 Key being compared to * @param maxlen Maximum length of the key to hash * @return 0 if equal, negative if lower and positive if higher * @see DBType#DB_INT * @see #DBComparator * @see #db_default_cmp(DBType) */ static int db_int_cmp(DBKey key1, DBKey key2, unsigned short maxlen) { (void)maxlen;//not used DB_COUNTSTAT(db_int_cmp); if (key1.i < key2.i) return -1; if (key1.i > key2.i) return 1; return 0; } /** * Default comparator for DB_UINT databases. * Compares key1 to key2. * Return 0 if equal, negative if lower and positive if higher. * maxlen is ignored. * @param key1 Key to be compared * @param key2 Key being compared to * @param maxlen Maximum length of the key to hash * @return 0 if equal, negative if lower and positive if higher * @see DBType#DB_UINT * @see #DBComparator * @see #db_default_cmp(DBType) */ static int db_uint_cmp(DBKey key1, DBKey key2, unsigned short maxlen) { (void)maxlen;//not used DB_COUNTSTAT(db_uint_cmp); if (key1.ui < key2.ui) return -1; if (key1.ui > key2.ui) return 1; return 0; } /** * Default comparator for DB_STRING databases. * Compares key1 to key2. * Return 0 if equal, negative if lower and positive if higher. * @param key1 Key to be compared * @param key2 Key being compared to * @param maxlen Maximum length of the key to hash * @return 0 if equal, negative if lower and positive if higher * @see DBType#DB_STRING * @see #DBComparator * @see #db_default_cmp(DBType) */ static int db_string_cmp(DBKey key1, DBKey key2, unsigned short maxlen) { DB_COUNTSTAT(db_string_cmp); return strncmp((const char *)key1.str, (const char *)key2.str, maxlen); } /** * Default comparator for DB_ISTRING databases. * Compares key1 to key2 case insensitively. * Return 0 if equal, negative if lower and positive if higher. * @param key1 Key to be compared * @param key2 Key being compared to * @param maxlen Maximum length of the key to hash * @return 0 if equal, negative if lower and positive if higher * @see DBType#DB_ISTRING * @see #DBComparator * @see #db_default_cmp(DBType) */ static int db_istring_cmp(DBKey key1, DBKey key2, unsigned short maxlen) { DB_COUNTSTAT(db_istring_cmp); return strncasecmp((const char *)key1.str, (const char *)key2.str, maxlen); } /** * Default hasher for DB_INT databases. * Returns the value of the key as an unsigned int. * maxlen is ignored. * @param key Key to be hashed * @param maxlen Maximum length of the key to hash * @return hash of the key * @see DBType#DB_INT * @see #DBHasher * @see #db_default_hash(DBType) */ static unsigned int db_int_hash(DBKey key, unsigned short maxlen) { (void)maxlen;//not used DB_COUNTSTAT(db_int_hash); return (unsigned int)key.i; } /** * Default hasher for DB_UINT databases. * Just returns the value of the key. * maxlen is ignored. * @param key Key to be hashed * @param maxlen Maximum length of the key to hash * @return hash of the key * @see DBType#DB_UINT * @see #DBHasher * @see #db_default_hash(DBType) */ static unsigned int db_uint_hash(DBKey key, unsigned short maxlen) { (void)maxlen;//not used DB_COUNTSTAT(db_uint_hash); return key.ui; } /** * Default hasher for DB_STRING databases. * @param key Key to be hashed * @param maxlen Maximum length of the key to hash * @return hash of the key * @see DBType#DB_STRING * @see #DBHasher * @see #db_default_hash(DBType) */ static unsigned int db_string_hash(DBKey key, unsigned short maxlen) { const char *k = key.str; unsigned int hash = 0; unsigned short i; DB_COUNTSTAT(db_string_hash); for (i = 0; *k; ++i) { hash = (hash*33 + ((unsigned char)*k))^(hash>>24); k++; if (i == maxlen) break; } return hash; } /** * Default hasher for DB_ISTRING databases. * @param key Key to be hashed * @param maxlen Maximum length of the key to hash * @return hash of the key * @see DBType#DB_ISTRING * @see #db_default_hash(DBType) */ static unsigned int db_istring_hash(DBKey key, unsigned short maxlen) { const char *k = key.str; unsigned int hash = 0; unsigned short i; DB_COUNTSTAT(db_istring_hash); for (i = 0; *k; i++) { hash = (hash*33 + ((unsigned char)TOLOWER(*k)))^(hash>>24); k++; if (i == maxlen) break; } return hash; } /** * Releaser that releases nothing. * @param key Key of the database entry * @param data Data of the database entry * @param which What is being requested to be released * @protected * @see #DBReleaser * @see #db_default_releaser(DBType,DBOptions) */ static void db_release_nothing(DBKey key, DBData data, DBRelease which) { (void)key;(void)data;(void)which;//not used DB_COUNTSTAT(db_release_nothing); } /** * Releaser that only releases the key. * @param key Key of the database entry * @param data Data of the database entry * @param which What is being requested to be released * @protected * @see #DBReleaser * @see #db_default_release(DBType,DBOptions) */ static void db_release_key(DBKey key, DBData data, DBRelease which) { (void)data;//not used DB_COUNTSTAT(db_release_key); if (which&DB_RELEASE_KEY) aFree((char*)key.str); // needs to be a pointer } /** * Releaser that only releases the data. * @param key Key of the database entry * @param data Data of the database entry * @param which What is being requested to be released * @protected * @see #DBData * @see #DBRelease * @see #DBReleaser * @see #db_default_release(DBType,DBOptions) */ static void db_release_data(DBKey key, DBData data, DBRelease which) { (void)key;//not used DB_COUNTSTAT(db_release_data); if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) aFree(data.u.ptr); } /** * Releaser that releases both key and data. * @param key Key of the database entry * @param data Data of the database entry * @param which What is being requested to be released * @protected * @see #DBKey * @see #DBData * @see #DBRelease * @see #DBReleaser * @see #db_default_release(DBType,DBOptions) */ static void db_release_both(DBKey key, DBData data, DBRelease which) { DB_COUNTSTAT(db_release_both); if (which&DB_RELEASE_KEY) aFree((char*)key.str); // needs to be a pointer if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) aFree(data.u.ptr); } /*****************************************************************************\ * (4) Section with protected functions used in the interface of the * * database and interface of the iterator. * * dbit_obj_first - Fetches the first entry from the database. * * dbit_obj_last - Fetches the last entry from the database. * * dbit_obj_next - Fetches the next entry from the database. * * dbit_obj_prev - Fetches the previous entry from the database. * * dbit_obj_exists - Returns true if the current entry exists. * * dbit_obj_remove - Remove the current entry from the database. * * dbit_obj_destroy - Destroys the iterator, unlocking the database and * * freeing used memory. * * db_obj_iterator - Return a new database iterator. * * db_obj_exists - Checks if an entry exists. * * db_obj_get - Get the data identified by the key. * * db_obj_vgetall - Get the data of the matched entries. * * db_obj_getall - Get the data of the matched entries. * * db_obj_vensure - Get the data identified by the key, creating if it * * doesn't exist yet. * * db_obj_ensure - Get the data identified by the key, creating if it * * doesn't exist yet. * * db_obj_put - Put data identified by the key in the database. * * db_obj_remove - Remove an entry from the database. * * db_obj_vforeach - Apply a function to every entry in the database. * * db_obj_foreach - Apply a function to every entry in the database. * * db_obj_vclear - Remove all entries from the database. * * db_obj_clear - Remove all entries from the database. * * db_obj_vdestroy - Destroy the database, freeing all the used memory. * * db_obj_destroy - Destroy the database, freeing all the used memory. * * db_obj_size - Return the size of the database. * * db_obj_type - Return the type of the database. * * db_obj_options - Return the options of the database. * \*****************************************************************************/ /** * Fetches the first entry in the database. * Returns the data of the entry. * Puts the key in out_key, if out_key is not NULL. * @param self Iterator * @param out_key Key of the entry * @return Data of the entry * @protected * @see DBIterator#first */ DBData* dbit_obj_first(DBIterator* self, DBKey* out_key) { DBIterator_impl* it = (DBIterator_impl*)self; DB_COUNTSTAT(dbit_first); // position before the first entry it->ht_index = -1; it->node = NULL; // get next entry return self->next(self, out_key); } /** * Fetches the last entry in the database. * Returns the data of the entry. * Puts the key in out_key, if out_key is not NULL. * @param self Iterator * @param out_key Key of the entry * @return Data of the entry * @protected * @see DBIterator#last */ DBData* dbit_obj_last(DBIterator* self, DBKey* out_key) { DBIterator_impl* it = (DBIterator_impl*)self; DB_COUNTSTAT(dbit_last); // position after the last entry it->ht_index = HASH_SIZE; it->node = NULL; // get previous entry return self->prev(self, out_key); } /** * Fetches the next entry in the database. * Returns the data of the entry. * Puts the key in out_key, if out_key is not NULL. * @param self Iterator * @param out_key Key of the entry * @return Data of the entry * @protected * @see DBIterator#next */ DBData* dbit_obj_next(DBIterator* self, DBKey* out_key) { DBIterator_impl* it = (DBIterator_impl*)self; DBNode node; DBNode parent; struct dbn fake; DB_COUNTSTAT(dbit_next); if( it->ht_index < 0 ) {// get first node it->ht_index = 0; it->node = NULL; } node = it->node; memset(&fake, 0, sizeof(fake)); for( ; it->ht_index < HASH_SIZE; ++(it->ht_index) ) { // Iterate in the order: left tree, current node, right tree if( node == NULL ) {// prepare initial node of this hash node = it->db->ht[it->ht_index]; if( node == NULL ) continue;// next hash fake.right = node; node = &fake; } while( node ) {// next node if( node->right ) {// continue in the right subtree node = node->right; while( node->left ) node = node->left;// get leftmost node } else {// continue to the next parent (recursive) parent = node->parent; while( parent ) { if( parent->right != node ) break; node = parent; parent = node->parent; } if( parent == NULL ) {// next hash node = NULL; break; } node = parent; } if( !node->deleted ) {// found next entry it->node = node; if( out_key ) memcpy(out_key, &node->key, sizeof(DBKey)); return &node->data; } } } it->node = NULL; return NULL;// not found } /** * Fetches the previous entry in the database. * Returns the data of the entry. * Puts the key in out_key, if out_key is not NULL. * @param self Iterator * @param out_key Key of the entry * @return Data of the entry * @protected * @see DBIterator#prev */ DBData* dbit_obj_prev(DBIterator* self, DBKey* out_key) { DBIterator_impl* it = (DBIterator_impl*)self; DBNode node; DBNode parent; struct dbn fake; DB_COUNTSTAT(dbit_prev); if( it->ht_index >= HASH_SIZE ) {// get last node it->ht_index = HASH_SIZE-1; it->node = NULL; } node = it->node; memset(&fake, 0, sizeof(fake)); for( ; it->ht_index >= 0; --(it->ht_index) ) { // Iterate in the order: right tree, current node, left tree if( node == NULL ) {// prepare initial node of this hash node = it->db->ht[it->ht_index]; if( node == NULL ) continue;// next hash fake.left = node; node = &fake; } while( node ) {// next node if( node->left ) {// continue in the left subtree node = node->left; while( node->right ) node = node->right;// get rightmost node } else {// continue to the next parent (recursive) parent = node->parent; while( parent ) { if( parent->left != node ) break; node = parent; parent = node->parent; } if( parent == NULL ) {// next hash node = NULL; break; } node = parent; } if( !node->deleted ) {// found previous entry it->node = node; if( out_key ) memcpy(out_key, &node->key, sizeof(DBKey)); return &node->data; } } } it->node = NULL; return NULL;// not found } /** * Returns true if the fetched entry exists. * The databases entries might have NULL data, so use this to to test if * the iterator is done. * @param self Iterator * @return true if the entry exists * @protected * @see DBIterator#exists */ bool dbit_obj_exists(DBIterator* self) { DBIterator_impl* it = (DBIterator_impl*)self; DB_COUNTSTAT(dbit_exists); return (it->node && !it->node->deleted); } /** * Removes the current entry from the database. * NOTE: {@link DBIterator#exists} will return false until another entry * is fetched * Puts data of the removed entry in out_data, if out_data is not NULL. * @param self Iterator * @param out_data Data of the removed entry. * @return 1 if entry was removed, 0 otherwise * @protected * @see DBMap#remove * @see DBIterator#remove */ int dbit_obj_remove(DBIterator* self, DBData *out_data) { DBIterator_impl* it = (DBIterator_impl*)self; DBNode node; int retval = 0; DB_COUNTSTAT(dbit_remove); node = it->node; if( node && !node->deleted ) { DBMap_impl* db = it->db; if( db->cache == node ) db->cache = NULL; if( out_data ) memcpy(out_data, &node->data, sizeof(DBData)); retval = 1; db->release(node->key, node->data, DB_RELEASE_DATA); db_free_add(db, node, &db->ht[it->ht_index]); } return retval; } /** * Destroys this iterator and unlocks the database. * @param self Iterator * @protected */ void dbit_obj_destroy(DBIterator* self) { DBIterator_impl* it = (DBIterator_impl*)self; DB_COUNTSTAT(dbit_destroy); // unlock the database db_free_unlock(it->db); // free iterator ers_free(db_iterator_ers,self); } /** * Returns a new iterator for this database. * The iterator keeps the database locked until it is destroyed. * The database will keep functioning normally but will only free internal * memory when unlocked, so destroy the iterator as soon as possible. * @param self Database * @return New iterator * @protected */ static DBIterator* db_obj_iterator(DBMap* self) { DBMap_impl* db = (DBMap_impl*)self; DBIterator_impl* it; DB_COUNTSTAT(db_iterator); it = ers_alloc(db_iterator_ers, struct DBIterator_impl); /* Interface of the iterator **/ it->vtable.first = dbit_obj_first; it->vtable.last = dbit_obj_last; it->vtable.next = dbit_obj_next; it->vtable.prev = dbit_obj_prev; it->vtable.exists = dbit_obj_exists; it->vtable.remove = dbit_obj_remove; it->vtable.destroy = dbit_obj_destroy; /* Initial state (before the first entry) */ it->db = db; it->ht_index = -1; it->node = NULL; /* Lock the database */ db_free_lock(db); return &it->vtable; } /** * Returns true if the entry exists. * @param self Interface of the database * @param key Key that identifies the entry * @return true is the entry exists * @protected * @see DBMap#exists */ static bool db_obj_exists(DBMap* self, DBKey key) { DBMap_impl* db = (DBMap_impl*)self; DBNode node; int c; bool found = false; DB_COUNTSTAT(db_exists); if (db == NULL) return false; // nullpo candidate if (!(db->options&DB_OPT_ALLOW_NULL_KEY) && db_is_key_null(db->type, key)) { return false; // nullpo candidate } if (db->cache && db->cmp(key, db->cache->key, db->maxlen) == 0) { #if defined(DEBUG) if (db->cache->deleted) { ShowDebug("db_exists: Cache contains a deleted node. Please report this!!!\n"); return false; } #endif return true; // cache hit } db_free_lock(db); node = db->ht[db->hash(key, db->maxlen)%HASH_SIZE]; while (node) { c = db->cmp(key, node->key, db->maxlen); if (c == 0) { if (!(node->deleted)) { db->cache = node; found = true; } break; } if (c < 0) node = node->left; else node = node->right; } db_free_unlock(db); return found; } /** * Get the data of the entry identified by the key. * @param self Interface of the database * @param key Key that identifies the entry * @return Data of the entry or NULL if not found * @protected * @see DBMap#get */ static DBData* db_obj_get(DBMap* self, DBKey key) { DBMap_impl* db = (DBMap_impl*)self; DBNode node; int c; DBData *data = NULL; DB_COUNTSTAT(db_get); if (db == NULL) return NULL; // nullpo candidate if (!(db->options&DB_OPT_ALLOW_NULL_KEY) && db_is_key_null(db->type, key)) { ShowError("db_get: Attempted to retrieve non-allowed NULL key for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return NULL; // nullpo candidate } if (db->cache && db->cmp(key, db->cache->key, db->maxlen) == 0) { #if defined(DEBUG) if (db->cache->deleted) { ShowDebug("db_get: Cache contains a deleted node. Please report this!!!\n"); return NULL; } #endif return &db->cache->data; // cache hit } db_free_lock(db); node = db->ht[db->hash(key, db->maxlen)%HASH_SIZE]; while (node) { c = db->cmp(key, node->key, db->maxlen); if (c == 0) { if (!(node->deleted)) { data = &node->data; db->cache = node; } break; } if (c < 0) node = node->left; else node = node->right; } db_free_unlock(db); return data; } /** * Get the data of the entries matched by match. * It puts a maximum of max entries into buf. * If buf is NULL, it only counts the matches. * Returns the number of entries that matched. * NOTE: if the value returned is greater than max, only the * first max entries found are put into the buffer. * @param self Interface of the database * @param buf Buffer to put the data of the matched entries * @param max Maximum number of data entries to be put into buf * @param match Function that matches the database entries * @param ... Extra arguments for match * @return The number of entries that matched * @protected * @see DBMap#vgetall */ static unsigned int db_obj_vgetall(DBMap* self, DBData **buf, unsigned int max, DBMatcher match, va_list args) { DBMap_impl* db = (DBMap_impl*)self; unsigned int i; DBNode node; DBNode parent; unsigned int ret = 0; DB_COUNTSTAT(db_vgetall); if (db == NULL) return 0; // nullpo candidate if (match == NULL) return 0; // nullpo candidate db_free_lock(db); for (i = 0; i < HASH_SIZE; i++) { // Match in the order: current node, left tree, right tree node = db->ht[i]; while (node) { if (!(node->deleted)) { va_list argscopy; va_copy(argscopy, args); if (match(node->key, node->data, argscopy) == 0) { if (buf && ret < max) buf[ret] = &node->data; ret++; } va_end(argscopy); } if (node->left) { node = node->left; continue; } if (node->right) { node = node->right; continue; } while (node) { parent = node->parent; if (parent && parent->right && parent->left == node) { node = parent->right; break; } node = parent; } } } db_free_unlock(db); return ret; } /** * Just calls {@link DBMap#vgetall}. * Get the data of the entries matched by match. * It puts a maximum of max entries into buf. * If buf is NULL, it only counts the matches. * Returns the number of entries that matched. * NOTE: if the value returned is greater than max, only the * first max entries found are put into the buffer. * @param self Interface of the database * @param buf Buffer to put the data of the matched entries * @param max Maximum number of data entries to be put into buf * @param match Function that matches the database entries * @param ... Extra arguments for match * @return The number of entries that matched * @protected * @see DBMap#vgetall * @see DBMap#getall */ static unsigned int db_obj_getall(DBMap* self, DBData **buf, unsigned int max, DBMatcher match, ...) { va_list args; unsigned int ret; DB_COUNTSTAT(db_getall); if (self == NULL) return 0; // nullpo candidate va_start(args, match); ret = self->vgetall(self, buf, max, match, args); va_end(args); return ret; } /** * Get the data of the entry identified by the key. * If the entry does not exist, an entry is added with the data returned by * create. * @param self Interface of the database * @param key Key that identifies the entry * @param create Function used to create the data if the entry doesn't exist * @param args Extra arguments for create * @return Data of the entry * @protected * @see DBMap#vensure */ static DBData* db_obj_vensure(DBMap* self, DBKey key, DBCreateData create, va_list args) { DBMap_impl* db = (DBMap_impl*)self; DBNode node; DBNode parent = NULL; unsigned int hash; int c = 0; DBData *data = NULL; DB_COUNTSTAT(db_vensure); if (db == NULL) return NULL; // nullpo candidate if (create == NULL) { ShowError("db_ensure: Create function is NULL for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return NULL; // nullpo candidate } if (!(db->options&DB_OPT_ALLOW_NULL_KEY) && db_is_key_null(db->type, key)) { ShowError("db_ensure: Attempted to use non-allowed NULL key for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return NULL; // nullpo candidate } if (db->cache && db->cmp(key, db->cache->key, db->maxlen) == 0) return &db->cache->data; // cache hit db_free_lock(db); hash = db->hash(key, db->maxlen)%HASH_SIZE; node = db->ht[hash]; while (node) { c = db->cmp(key, node->key, db->maxlen); if (c == 0) { break; } parent = node; if (c < 0) node = node->left; else node = node->right; } // Create node if necessary if (node == NULL) { va_list argscopy; if (db->item_count == UINT32_MAX) { ShowError("db_vensure: item_count overflow, aborting item insertion.\n" "Database allocated at %s:%d", db->alloc_file, db->alloc_line); return NULL; } DB_COUNTSTAT(db_node_alloc); node = ers_alloc(db->nodes, struct dbn); node->left = NULL; node->right = NULL; node->deleted = 0; db->item_count++; if (c == 0) { // hash entry is empty node->color = BLACK; node->parent = NULL; db->ht[hash] = node; } else { node->color = RED; if (c < 0) { // put at the left parent->left = node; node->parent = parent; } else { // put at the right parent->right = node; node->parent = parent; } if (parent->color == RED) // two consecutive RED nodes, must rebalance db_rebalance(node, &db->ht[hash]); } // put key and data in the node if (db->options&DB_OPT_DUP_KEY) { node->key = db_dup_key(db, key); if (db->options&DB_OPT_RELEASE_KEY) db->release(key, node->data, DB_RELEASE_KEY); } else { node->key = key; } va_copy(argscopy, args); node->data = create(key, argscopy); va_end(argscopy); } data = &node->data; db->cache = node; db_free_unlock(db); return data; } /** * Just calls {@link DBMap#vensure}. * Get the data of the entry identified by the key. * If the entry does not exist, an entry is added with the data returned by * create. * @param self Interface of the database * @param key Key that identifies the entry * @param create Function used to create the data if the entry doesn't exist * @param ... Extra arguments for create * @return Data of the entry * @protected * @see DBMap#vensure * @see DBMap#ensure */ static DBData* db_obj_ensure(DBMap* self, DBKey key, DBCreateData create, ...) { va_list args; DBData *ret = NULL; DB_COUNTSTAT(db_ensure); if (self == NULL) return NULL; // nullpo candidate va_start(args, create); ret = self->vensure(self, key, create, args); va_end(args); return ret; } /** * Put the data identified by the key in the database. * Puts the previous data in out_data, if out_data is not NULL. * NOTE: Uses the new key, the old one is released. * @param self Interface of the database * @param key Key that identifies the data * @param data Data to be put in the database * @param out_data Previous data if the entry exists * @return 1 if if the entry already exists, 0 otherwise * @protected * @see #db_malloc_dbn(void) * @see DBMap#put */ static int db_obj_put(DBMap* self, DBKey key, DBData data, DBData *out_data) { DBMap_impl* db = (DBMap_impl*)self; DBNode node; DBNode parent = NULL; int c = 0, retval = 0; unsigned int hash; DB_COUNTSTAT(db_put); if (db == NULL) return 0; // nullpo candidate if (db->global_lock) { ShowError("db_put: Database is being destroyed, aborting entry insertion.\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); return 0; // nullpo candidate } if (!(db->options&DB_OPT_ALLOW_NULL_KEY) && db_is_key_null(db->type, key)) { ShowError("db_put: Attempted to use non-allowed NULL key for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return 0; // nullpo candidate } if (!(db->options&DB_OPT_ALLOW_NULL_DATA) && (data.type == DB_DATA_PTR && data.u.ptr == NULL)) { ShowError("db_put: Attempted to use non-allowed NULL data for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return 0; // nullpo candidate } if (db->item_count == UINT32_MAX) { ShowError("db_put: item_count overflow, aborting item insertion.\n" "Database allocated at %s:%d", db->alloc_file, db->alloc_line); return 0; } // search for an equal node db_free_lock(db); hash = db->hash(key, db->maxlen)%HASH_SIZE; for (node = db->ht[hash]; node; ) { c = db->cmp(key, node->key, db->maxlen); if (c == 0) { // equal entry, replace if (node->deleted) { db_free_remove(db, node); } else { if (out_data) memcpy(out_data, &node->data, sizeof(*out_data)); db->release(node->key, node->data, DB_RELEASE_BOTH); retval = 1; } break; } parent = node; if (c < 0) { node = node->left; } else { node = node->right; } } // allocate a new node if necessary if (node == NULL) { DB_COUNTSTAT(db_node_alloc); node = ers_alloc(db->nodes, struct dbn); node->left = NULL; node->right = NULL; node->deleted = 0; db->item_count++; if (c == 0) { // hash entry is empty node->color = BLACK; node->parent = NULL; db->ht[hash] = node; } else { node->color = RED; if (c < 0) { // put at the left parent->left = node; node->parent = parent; } else { // put at the right parent->right = node; node->parent = parent; } if (parent->color == RED) // two consecutive RED nodes, must rebalance db_rebalance(node, &db->ht[hash]); } } // put key and data in the node if (db->options&DB_OPT_DUP_KEY) { node->key = db_dup_key(db, key); if (db->options&DB_OPT_RELEASE_KEY) db->release(key, data, DB_RELEASE_KEY); } else { node->key = key; } node->data = data; db->cache = node; db_free_unlock(db); return retval; } /** * Remove an entry from the database. * Puts the previous data in out_data, if out_data is not NULL. * NOTE: The key (of the database) is released in {@link #db_free_add(DBMap_impl*,DBNode,DBNode *)}. * @param self Interface of the database * @param key Key that identifies the entry * @param out_data Previous data if the entry exists * @return 1 if if the entry already exists, 0 otherwise * @protected * @see #db_free_add(DBMap_impl*,DBNode,DBNode *) * @see DBMap#remove */ static int db_obj_remove(DBMap* self, DBKey key, DBData *out_data) { DBMap_impl* db = (DBMap_impl*)self; DBNode node; unsigned int hash; int c = 0, retval = 0; DB_COUNTSTAT(db_remove); if (db == NULL) return 0; // nullpo candidate if (db->global_lock) { ShowError("db_remove: Database is being destroyed. Aborting entry deletion.\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); return 0; // nullpo candidate } if (!(db->options&DB_OPT_ALLOW_NULL_KEY) && db_is_key_null(db->type, key)) { ShowError("db_remove: Attempted to use non-allowed NULL key for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return 0; // nullpo candidate } db_free_lock(db); hash = db->hash(key, db->maxlen)%HASH_SIZE; for(node = db->ht[hash]; node; ){ c = db->cmp(key, node->key, db->maxlen); if (c == 0) { if (!(node->deleted)) { if (db->cache == node) db->cache = NULL; if (out_data) memcpy(out_data, &node->data, sizeof(*out_data)); retval = 1; db->release(node->key, node->data, DB_RELEASE_DATA); db_free_add(db, node, &db->ht[hash]); } break; } if (c < 0) node = node->left; else node = node->right; } db_free_unlock(db); return retval; } /** * Apply func to every entry in the database. * Returns the sum of values returned by func. * @param self Interface of the database * @param func Function to be applied * @param args Extra arguments for func * @return Sum of the values returned by func * @protected * @see DBMap#vforeach */ static int db_obj_vforeach(DBMap* self, DBApply func, va_list args) { DBMap_impl* db = (DBMap_impl*)self; unsigned int i; int sum = 0; DBNode node; DBNode parent; DB_COUNTSTAT(db_vforeach); if (db == NULL) return 0; // nullpo candidate if (func == NULL) { ShowError("db_foreach: Passed function is NULL for db allocated at %s:%d\n",db->alloc_file, db->alloc_line); return 0; // nullpo candidate } db_free_lock(db); for (i = 0; i < HASH_SIZE; i++) { // Apply func in the order: current node, left node, right node node = db->ht[i]; while (node) { if (!(node->deleted)) { va_list argscopy; va_copy(argscopy, args); sum += func(node->key, &node->data, argscopy); va_end(argscopy); } if (node->left) { node = node->left; continue; } if (node->right) { node = node->right; continue; } while (node) { parent = node->parent; if (parent && parent->right && parent->left == node) { node = parent->right; break; } node = parent; } } } db_free_unlock(db); return sum; } /** * Just calls {@link DBMap#vforeach}. * Apply func to every entry in the database. * Returns the sum of values returned by func. * @param self Interface of the database * @param func Function to be applyed * @param ... Extra arguments for func * @return Sum of the values returned by func * @protected * @see DBMap#vforeach * @see DBMap#foreach */ static int db_obj_foreach(DBMap* self, DBApply func, ...) { va_list args; int ret; DB_COUNTSTAT(db_foreach); if (self == NULL) return 0; // nullpo candidate va_start(args, func); ret = self->vforeach(self, func, args); va_end(args); return ret; } /** * Removes all entries from the database. * Before deleting an entry, func is applied to it. * Releases the key and the data. * Returns the sum of values returned by func, if it exists. * @param self Interface of the database * @param func Function to be applied to every entry before deleting * @param args Extra arguments for func * @return Sum of values returned by func * @protected * @see DBMap#vclear */ static int db_obj_vclear(DBMap* self, DBApply func, va_list args) { DBMap_impl* db = (DBMap_impl*)self; int sum = 0; unsigned int i; DBNode node; DBNode parent; DB_COUNTSTAT(db_vclear); if (db == NULL) return 0; // nullpo candidate db_free_lock(db); db->cache = NULL; for (i = 0; i < HASH_SIZE; i++) { // Apply the func and delete in the order: left tree, right tree, current node node = db->ht[i]; db->ht[i] = NULL; while (node) { parent = node->parent; if (node->left) { node = node->left; continue; } if (node->right) { node = node->right; continue; } if (node->deleted) { db_dup_key_free(db, node->key); } else { if (func) { va_list argscopy; va_copy(argscopy, args); sum += func(node->key, &node->data, argscopy); va_end(argscopy); } db->release(node->key, node->data, DB_RELEASE_BOTH); node->deleted = 1; } DB_COUNTSTAT(db_node_free); if (parent) { if (parent->left == node) parent->left = NULL; else parent->right = NULL; } ers_free(db->nodes, node); node = parent; } db->ht[i] = NULL; } db->free_count = 0; db->item_count = 0; db_free_unlock(db); return sum; } /** * Just calls {@link DBMap#vclear}. * Removes all entries from the database. * Before deleting an entry, func is applied to it. * Releases the key and the data. * Returns the sum of values returned by func, if it exists. * NOTE: This locks the database globally. Any attempt to insert or remove * a database entry will give an error and be aborted (except for clearing). * @param self Interface of the database * @param func Function to be applied to every entry before deleting * @param ... Extra arguments for func * @return Sum of values returned by func * @protected * @see DBMap#vclear * @see DBMap#clear */ static int db_obj_clear(DBMap* self, DBApply func, ...) { va_list args; int ret; DB_COUNTSTAT(db_clear); if (self == NULL) return 0; // nullpo candidate va_start(args, func); ret = self->vclear(self, func, args); va_end(args); return ret; } /** * Finalize the database, feeing all the memory it uses. * Before deleting an entry, func is applied to it. * Returns the sum of values returned by func, if it exists. * NOTE: This locks the database globally. Any attempt to insert or remove * a database entry will give an error and be aborted (except for clearing). * @param self Interface of the database * @param func Function to be applied to every entry before deleting * @param args Extra arguments for func * @return Sum of values returned by func * @protected * @see DBMap#vdestroy */ static int db_obj_vdestroy(DBMap* self, DBApply func, va_list args) { DBMap_impl* db = (DBMap_impl*)self; int sum; DB_COUNTSTAT(db_vdestroy); if (db == NULL) return 0; // nullpo candidate if (db->global_lock) { ShowError("db_vdestroy: Database is already locked for destruction. Aborting second database destruction.\n" "Database allocated at %s:%d\n", db->alloc_file, db->alloc_line); return 0; } if (db->free_lock) ShowWarning("db_vdestroy: Database is still in use, %u lock(s) left. Continuing database destruction.\n" "Database allocated at %s:%d\n", db->free_lock, db->alloc_file, db->alloc_line); #ifdef DB_ENABLE_STATS switch (db->type) { case DB_INT: DB_COUNTSTAT(db_int_destroy); break; case DB_UINT: DB_COUNTSTAT(db_uint_destroy); break; case DB_STRING: DB_COUNTSTAT(db_string_destroy); break; case DB_ISTRING: DB_COUNTSTAT(db_istring_destroy); break; } #endif /* DB_ENABLE_STATS */ db_free_lock(db); db->global_lock = 1; sum = self->vclear(self, func, args); aFree(db->free_list); db->free_list = NULL; db->free_max = 0; ers_destroy(db->nodes); db_free_unlock(db); ers_free(db_alloc_ers, db); return sum; } /** * Just calls {@link DBMap#db_vdestroy}. * Finalize the database, feeing all the memory it uses. * Before deleting an entry, func is applied to it. * Releases the key and the data. * Returns the sum of values returned by func, if it exists. * NOTE: This locks the database globally. Any attempt to insert or remove * a database entry will give an error and be aborted. * @param self Database * @param func Function to be applied to every entry before deleting * @param ... Extra arguments for func * @return Sum of values returned by func * @protected * @see DBMap#vdestroy * @see DBMap#destroy */ static int db_obj_destroy(DBMap* self, DBApply func, ...) { va_list args; int ret; DB_COUNTSTAT(db_destroy); if (self == NULL) return 0; // nullpo candidate va_start(args, func); ret = self->vdestroy(self, func, args); va_end(args); return ret; } /** * Return the size of the database (number of items in the database). * @param self Interface of the database * @return Size of the database * @protected * @see DBMap_impl#item_count * @see DBMap#size */ static unsigned int db_obj_size(DBMap* self) { DBMap_impl* db = (DBMap_impl*)self; unsigned int item_count; DB_COUNTSTAT(db_size); if (db == NULL) return 0; // nullpo candidate db_free_lock(db); item_count = db->item_count; db_free_unlock(db); return item_count; } /** * Return the type of database. * @param self Interface of the database * @return Type of the database * @protected * @see DBMap_impl#type * @see DBMap#type */ static DBType db_obj_type(DBMap* self) { DBMap_impl* db = (DBMap_impl*)self; DBType type; DB_COUNTSTAT(db_type); if (db == NULL) return (DBType)-1; // nullpo candidate - TODO what should this return? db_free_lock(db); type = db->type; db_free_unlock(db); return type; } /** * Return the options of the database. * @param self Interface of the database * @return Options of the database * @protected * @see DBMap_impl#options * @see DBMap#options */ static DBOptions db_obj_options(DBMap* self) { DBMap_impl* db = (DBMap_impl*)self; DBOptions options; DB_COUNTSTAT(db_options); if (db == NULL) return DB_OPT_BASE; // nullpo candidate - TODO what should this return? db_free_lock(db); options = db->options; db_free_unlock(db); return options; } /*****************************************************************************\ * (5) Section with public functions. * db_fix_options - Apply database type restrictions to the options. * db_default_cmp - Get the default comparator for a type of database. * db_default_hash - Get the default hasher for a type of database. * db_default_release - Get the default releaser for a type of database with the specified options. * db_custom_release - Get a releaser that behaves a certains way. * db_alloc - Allocate a new database. * db_i2key - Manual cast from 'int' to 'DBKey'. * db_ui2key - Manual cast from 'unsigned int' to 'DBKey'. * db_str2key - Manual cast from 'unsigned char *' to 'DBKey'. * db_i2data - Manual cast from 'int' to 'DBData'. * db_ui2data - Manual cast from 'unsigned int' to 'DBData'. * db_ptr2data - Manual cast from 'void*' to 'DBData'. * db_data2i - Gets 'int' value from 'DBData'. * db_data2ui - Gets 'unsigned int' value from 'DBData'. * db_data2ptr - Gets 'void*' value from 'DBData'. * db_init - Initializes the database system. * db_final - Finalizes the database system. \*****************************************************************************/ /** * Returns the fixed options according to the database type. * Sets required options and unsets unsupported options. * For numeric databases DB_OPT_DUP_KEY and DB_OPT_RELEASE_KEY are unset. * @param type Type of the database * @param options Original options of the database * @return Fixed options of the database * @private * @see #db_default_release(DBType,DBOptions) * @see #db_alloc(const char *,int,DBType,DBOptions,unsigned short) */ DBOptions db_fix_options(DBType type, DBOptions options) { DB_COUNTSTAT(db_fix_options); switch (type) { case DB_INT: case DB_UINT: // Numeric database, do nothing with the keys return (DBOptions)(options&~(DB_OPT_DUP_KEY|DB_OPT_RELEASE_KEY)); default: ShowError("db_fix_options: Unknown database type %u with options %x\n", type, options); case DB_STRING: case DB_ISTRING: // String databases, no fix required return options; } } /** * Returns the default comparator for the specified type of database. * @param type Type of database * @return Comparator for the type of database or NULL if unknown database * @public * @see #db_int_cmp(DBKey,DBKey,unsigned short) * @see #db_uint_cmp(DBKey,DBKey,unsigned short) * @see #db_string_cmp(DBKey,DBKey,unsigned short) * @see #db_istring_cmp(DBKey,DBKey,unsigned short) */ DBComparator db_default_cmp(DBType type) { DB_COUNTSTAT(db_default_cmp); switch (type) { case DB_INT: return &db_int_cmp; case DB_UINT: return &db_uint_cmp; case DB_STRING: return &db_string_cmp; case DB_ISTRING: return &db_istring_cmp; default: ShowError("db_default_cmp: Unknown database type %u\n", type); return NULL; } } /** * Returns the default hasher for the specified type of database. * @param type Type of database * @return Hasher of the type of database or NULL if unknown database * @public * @see #db_int_hash(DBKey,unsigned short) * @see #db_uint_hash(DBKey,unsigned short) * @see #db_string_hash(DBKey,unsigned short) * @see #db_istring_hash(DBKey,unsigned short) */ DBHasher db_default_hash(DBType type) { DB_COUNTSTAT(db_default_hash); switch (type) { case DB_INT: return &db_int_hash; case DB_UINT: return &db_uint_hash; case DB_STRING: return &db_string_hash; case DB_ISTRING: return &db_istring_hash; default: ShowError("db_default_hash: Unknown database type %u\n", type); return NULL; } } /** * Returns the default releaser for the specified type of database with the * specified options. * NOTE: the options are fixed with {@link #db_fix_options(DBType,DBOptions)} * before choosing the releaser. * @param type Type of database * @param options Options of the database * @return Default releaser for the type of database with the specified options * @public * @see #db_release_nothing(DBKey,DBData,DBRelease) * @see #db_release_key(DBKey,DBData,DBRelease) * @see #db_release_data(DBKey,DBData,DBRelease) * @see #db_release_both(DBKey,DBData,DBRelease) * @see #db_custom_release(DBRelease) */ DBReleaser db_default_release(DBType type, DBOptions options) { DB_COUNTSTAT(db_default_release); options = DB->fix_options(type, options); if (options&DB_OPT_RELEASE_DATA) { // Release data, what about the key? if (options&(DB_OPT_DUP_KEY|DB_OPT_RELEASE_KEY)) return &db_release_both; // Release both key and data return &db_release_data; // Only release data } if (options&(DB_OPT_DUP_KEY|DB_OPT_RELEASE_KEY)) return &db_release_key; // Only release key return &db_release_nothing; // Release nothing } /** * Returns the releaser that releases the specified release options. * @param which Options that specified what the releaser releases * @return Releaser for the specified release options * @public * @see #db_release_nothing(DBKey,DBData,DBRelease) * @see #db_release_key(DBKey,DBData,DBRelease) * @see #db_release_data(DBKey,DBData,DBRelease) * @see #db_release_both(DBKey,DBData,DBRelease) * @see #db_default_release(DBType,DBOptions) */ DBReleaser db_custom_release(DBRelease which) { DB_COUNTSTAT(db_custom_release); switch (which) { case DB_RELEASE_NOTHING: return &db_release_nothing; case DB_RELEASE_KEY: return &db_release_key; case DB_RELEASE_DATA: return &db_release_data; case DB_RELEASE_BOTH: return &db_release_both; default: ShowError("db_custom_release: Unknown release options %u\n", which); return NULL; } } /** * Allocate a new database of the specified type. * NOTE: the options are fixed by {@link #db_fix_options(DBType,DBOptions)} * before creating the database. * @param file File where the database is being allocated * @param line Line of the file where the database is being allocated * @param type Type of database * @param options Options of the database * @param maxlen Maximum length of the string to be used as key in string * databases. If 0, the maximum number of maxlen is used (64K). * @return The interface of the database * @public * @see #DBMap_impl * @see #db_fix_options(DBType,DBOptions) */ DBMap* db_alloc(const char *file, const char *func, int line, DBType type, DBOptions options, unsigned short maxlen) { DBMap_impl* db; unsigned int i; char ers_name[50]; #ifdef DB_ENABLE_STATS DB_COUNTSTAT(db_alloc); switch (type) { case DB_INT: DB_COUNTSTAT(db_int_alloc); break; case DB_UINT: DB_COUNTSTAT(db_uint_alloc); break; case DB_STRING: DB_COUNTSTAT(db_string_alloc); break; case DB_ISTRING: DB_COUNTSTAT(db_istring_alloc); break; } #endif /* DB_ENABLE_STATS */ db = ers_alloc(db_alloc_ers, struct DBMap_impl); options = DB->fix_options(type, options); /* Interface of the database */ db->vtable.iterator = db_obj_iterator; db->vtable.exists = db_obj_exists; db->vtable.get = db_obj_get; db->vtable.getall = db_obj_getall; db->vtable.vgetall = db_obj_vgetall; db->vtable.ensure = db_obj_ensure; db->vtable.vensure = db_obj_vensure; db->vtable.put = db_obj_put; db->vtable.remove = db_obj_remove; db->vtable.foreach = db_obj_foreach; db->vtable.vforeach = db_obj_vforeach; db->vtable.clear = db_obj_clear; db->vtable.vclear = db_obj_vclear; db->vtable.destroy = db_obj_destroy; db->vtable.vdestroy = db_obj_vdestroy; db->vtable.size = db_obj_size; db->vtable.type = db_obj_type; db->vtable.options = db_obj_options; /* File and line of allocation */ db->alloc_file = file; db->alloc_line = line; /* Lock system */ db->free_list = NULL; db->free_count = 0; db->free_max = 0; db->free_lock = 0; /* Other */ snprintf(ers_name, 50, "db_alloc:nodes:%s:%s:%d",func,file,line); db->nodes = ers_new(sizeof(struct dbn),ers_name,ERS_OPT_WAIT|ERS_OPT_FREE_NAME); db->cmp = DB->default_cmp(type); db->hash = DB->default_hash(type); db->release = DB->default_release(type, options); for (i = 0; i < HASH_SIZE; i++) db->ht[i] = NULL; db->cache = NULL; db->type = type; db->options = options; db->item_count = 0; db->maxlen = maxlen; db->global_lock = 0; if( db->maxlen == 0 && (type == DB_STRING || type == DB_ISTRING) ) db->maxlen = UINT16_MAX; return &db->vtable; } /** * Manual cast from 'int' to the union DBKey. * @param key Key to be casted * @return The key as a DBKey union * @public */ DBKey db_i2key(int key) { DBKey ret; DB_COUNTSTAT(db_i2key); ret.i = key; return ret; } /** * Manual cast from 'unsigned int' to the union DBKey. * @param key Key to be casted * @return The key as a DBKey union * @public */ DBKey db_ui2key(unsigned int key) { DBKey ret; DB_COUNTSTAT(db_ui2key); ret.ui = key; return ret; } /** * Manual cast from 'const char *' to the union DBKey. * @param key Key to be casted * @return The key as a DBKey union * @public */ DBKey db_str2key(const char *key) { DBKey ret; DB_COUNTSTAT(db_str2key); ret.str = key; return ret; } /** * Manual cast from 'int' to the struct DBData. * @param data Data to be casted * @return The data as a DBData struct * @public */ DBData db_i2data(int data) { DBData ret; DB_COUNTSTAT(db_i2data); ret.type = DB_DATA_INT; ret.u.i = data; return ret; } /** * Manual cast from 'unsigned int' to the struct DBData. * @param data Data to be casted * @return The data as a DBData struct * @public */ DBData db_ui2data(unsigned int data) { DBData ret; DB_COUNTSTAT(db_ui2data); ret.type = DB_DATA_UINT; ret.u.ui = data; return ret; } /** * Manual cast from 'void *' to the struct DBData. * @param data Data to be casted * @return The data as a DBData struct * @public */ DBData db_ptr2data(void *data) { DBData ret; DB_COUNTSTAT(db_ptr2data); ret.type = DB_DATA_PTR; ret.u.ptr = data; return ret; } /** * Gets int type data from struct DBData. * If data is not int type, returns 0. * @param data Data * @return Integer value of the data. * @public */ int db_data2i(DBData *data) { DB_COUNTSTAT(db_data2i); if (data && DB_DATA_INT == data->type) return data->u.i; return 0; } /** * Gets unsigned int type data from struct DBData. * If data is not unsigned int type, returns 0. * @param data Data * @return Unsigned int value of the data. * @public */ unsigned int db_data2ui(DBData *data) { DB_COUNTSTAT(db_data2ui); if (data && DB_DATA_UINT == data->type) return data->u.ui; return 0; } /** * Gets void* type data from struct DBData. * If data is not void* type, returns NULL. * @param data Data * @return Void* value of the data. * @public */ void* db_data2ptr(DBData *data) { DB_COUNTSTAT(db_data2ptr); if (data && DB_DATA_PTR == data->type) return data->u.ptr; return NULL; } /** * Initializes the database system. * @public * @see #db_final(void) */ void db_init(void) { db_iterator_ers = ers_new(sizeof(struct DBIterator_impl),"db.c::db_iterator_ers",ERS_OPT_NONE); db_alloc_ers = ers_new(sizeof(struct DBMap_impl),"db.c::db_alloc_ers",ERS_OPT_NONE); ers_chunk_size(db_alloc_ers, 50); DB_COUNTSTAT(db_init); } /** * Finalizes the database system. * @public * @see #db_init(void) */ void db_final(void) { #ifdef DB_ENABLE_STATS DB_COUNTSTAT(db_final); ShowInfo(CL_WHITE"Database nodes"CL_RESET":\n" "allocated %u, freed %u\n", stats.db_node_alloc, stats.db_node_free); ShowInfo(CL_WHITE"Database types"CL_RESET":\n" "DB_INT : allocated %10u, destroyed %10u\n" "DB_UINT : allocated %10u, destroyed %10u\n" "DB_STRING : allocated %10u, destroyed %10u\n" "DB_ISTRING : allocated %10u, destroyed %10u\n", stats.db_int_alloc, stats.db_int_destroy, stats.db_uint_alloc, stats.db_uint_destroy, stats.db_string_alloc, stats.db_string_destroy, stats.db_istring_alloc, stats.db_istring_destroy); ShowInfo(CL_WHITE"Database function counters"CL_RESET":\n" "db_rotate_left %10u, db_rotate_right %10u,\n" "db_rebalance %10u, db_rebalance_erase %10u,\n" "db_is_key_null %10u,\n" "db_dup_key %10u, db_dup_key_free %10u,\n" "db_free_add %10u, db_free_remove %10u,\n" "db_free_lock %10u, db_free_unlock %10u,\n" "db_int_cmp %10u, db_uint_cmp %10u,\n" "db_string_cmp %10u, db_istring_cmp %10u,\n" "db_int_hash %10u, db_uint_hash %10u,\n" "db_string_hash %10u, db_istring_hash %10u,\n" "db_release_nothing %10u, db_release_key %10u,\n" "db_release_data %10u, db_release_both %10u,\n" "dbit_first %10u, dbit_last %10u,\n" "dbit_next %10u, dbit_prev %10u,\n" "dbit_exists %10u, dbit_remove %10u,\n" "dbit_destroy %10u, db_iterator %10u,\n" "db_exits %10u, db_get %10u,\n" "db_getall %10u, db_vgetall %10u,\n" "db_ensure %10u, db_vensure %10u,\n" "db_put %10u, db_remove %10u,\n" "db_foreach %10u, db_vforeach %10u,\n" "db_clear %10u, db_vclear %10u,\n" "db_destroy %10u, db_vdestroy %10u,\n" "db_size %10u, db_type %10u,\n" "db_options %10u, db_fix_options %10u,\n" "db_default_cmp %10u, db_default_hash %10u,\n" "db_default_release %10u, db_custom_release %10u,\n" "db_alloc %10u, db_i2key %10u,\n" "db_ui2key %10u, db_str2key %10u,\n" "db_i2data %10u, db_ui2data %10u,\n" "db_ptr2data %10u, db_data2i %10u,\n" "db_data2ui %10u, db_data2ptr %10u,\n" "db_init %10u, db_final %10u\n", stats.db_rotate_left, stats.db_rotate_right, stats.db_rebalance, stats.db_rebalance_erase, stats.db_is_key_null, stats.db_dup_key, stats.db_dup_key_free, stats.db_free_add, stats.db_free_remove, stats.db_free_lock, stats.db_free_unlock, stats.db_int_cmp, stats.db_uint_cmp, stats.db_string_cmp, stats.db_istring_cmp, stats.db_int_hash, stats.db_uint_hash, stats.db_string_hash, stats.db_istring_hash, stats.db_release_nothing, stats.db_release_key, stats.db_release_data, stats.db_release_both, stats.dbit_first, stats.dbit_last, stats.dbit_next, stats.dbit_prev, stats.dbit_exists, stats.dbit_remove, stats.dbit_destroy, stats.db_iterator, stats.db_exists, stats.db_get, stats.db_getall, stats.db_vgetall, stats.db_ensure, stats.db_vensure, stats.db_put, stats.db_remove, stats.db_foreach, stats.db_vforeach, stats.db_clear, stats.db_vclear, stats.db_destroy, stats.db_vdestroy, stats.db_size, stats.db_type, stats.db_options, stats.db_fix_options, stats.db_default_cmp, stats.db_default_hash, stats.db_default_release, stats.db_custom_release, stats.db_alloc, stats.db_i2key, stats.db_ui2key, stats.db_str2key, stats.db_i2data, stats.db_ui2data, stats.db_ptr2data, stats.db_data2i, stats.db_data2ui, stats.db_data2ptr, stats.db_init, stats.db_final); #endif /* DB_ENABLE_STATS */ ers_destroy(db_iterator_ers); ers_destroy(db_alloc_ers); } // Link DB System - jAthena void linkdb_insert( struct linkdb_node** head, void *key, void* data) { struct linkdb_node *node; if( head == NULL ) return ; node = (struct linkdb_node*)aMalloc( sizeof(struct linkdb_node) ); if( *head == NULL ) { // first node *head = node; node->prev = NULL; node->next = NULL; } else { // link nodes node->next = *head; node->prev = (*head)->prev; (*head)->prev = node; (*head) = node; } node->key = key; node->data = data; } void linkdb_vforeach( struct linkdb_node** head, LinkDBFunc func, va_list ap) { struct linkdb_node *node; if( head == NULL ) return; node = *head; while ( node ) { va_list argscopy; va_copy(argscopy, ap); func(node->key, node->data, argscopy); va_end(argscopy); node = node->next; } } void linkdb_foreach( struct linkdb_node** head, LinkDBFunc func, ...) { va_list ap; va_start(ap, func); linkdb_vforeach(head, func, ap); va_end(ap); } void* linkdb_search( struct linkdb_node** head, void *key) { int n = 0; struct linkdb_node *node; if( head == NULL ) return NULL; node = *head; while( node ) { if( node->key == key ) { if( node->prev && n > 5 ) { //Moving the head in order to improve processing efficiency if(node->prev) node->prev->next = node->next; if(node->next) node->next->prev = node->prev; node->next = *head; node->prev = (*head)->prev; (*head)->prev = node; (*head) = node; } return node->data; } node = node->next; n++; } return NULL; } void* linkdb_erase( struct linkdb_node** head, void *key) { struct linkdb_node *node; if( head == NULL ) return NULL; node = *head; while( node ) { if( node->key == key ) { void *data = node->data; if( node->prev == NULL ) *head = node->next; else node->prev->next = node->next; if( node->next ) node->next->prev = node->prev; aFree( node ); return data; } node = node->next; } return NULL; } void linkdb_replace( struct linkdb_node** head, void *key, void *data ) { int n = 0; struct linkdb_node *node; if( head == NULL ) return ; node = *head; while( node ) { if( node->key == key ) { if( node->prev && n > 5 ) { //Moving the head in order to improve processing efficiency if(node->prev) node->prev->next = node->next; if(node->next) node->next->prev = node->prev; node->next = *head; node->prev = (*head)->prev; (*head)->prev = node; (*head) = node; } node->data = data; return ; } node = node->next; n++; } //Insert because it can not find linkdb_insert( head, key, data ); } void linkdb_final( struct linkdb_node** head ) { struct linkdb_node *node, *node2; if( head == NULL ) return ; node = *head; while( node ) { node2 = node->next; aFree( node ); node = node2; } *head = NULL; } void db_defaults(void) { DB = &DB_s; DB->alloc = db_alloc; DB->custom_release = db_custom_release; DB->data2i = db_data2i; DB->data2ptr = db_data2ptr; DB->data2ui = db_data2ui; DB->default_cmp = db_default_cmp; DB->default_hash = db_default_hash; DB->default_release = db_default_release; DB->final = db_final; DB->fix_options = db_fix_options; DB->i2data = db_i2data; DB->i2key = db_i2key; DB->init = db_init; DB->ptr2data = db_ptr2data; DB->str2key = db_str2key; DB->ui2data = db_ui2data; DB->ui2key = db_ui2key; }