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#ifndef hash_h
#define hash_h
/*
* Copyright (c) 2000, 2001 by Martin C. Shepherd.
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, and/or sell copies of the Software, and to permit persons
* to whom the Software is furnished to do so, provided that the above
* copyright notice(s) and this permission notice appear in all copies of
* the Software and that both the above copyright notice(s) and this
* permission notice appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
* OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Except as contained in this notice, the name of a copyright holder
* shall not be used in advertising or otherwise to promote the sale, use
* or other dealings in this Software without prior written authorization
* of the copyright holder.
*/
/*
* The following macro can be used to prototype or define a
* function that deletes the data of a symbol-table entry.
*
* Input:
* app_data void * The _new_HashTable() app_data argument.
* code int The Symbol::code argument.
* sym_data void * The Symbol::data argument to be deleted.
* Output:
* return void * The deleted data (always return NULL).
*/
#define SYM_DEL_FN(fn) void *(fn)(void *app_data, int code, void *sym_data)
/*
* The following macro can be used to prototype or define a
* function that deletes the application-data of a hash-table.
*
* Input:
* data void * The _new_HashTable() 'app_data' argument to be
* deleted.
* Output:
* return void * The deleted data (always return NULL).
*/
#define HASH_DEL_FN(fn) void *(fn)(void *app_data)
/*
* The following is a container for recording the context
* of a symbol in a manner that is independant of the particular
* symbol-table implementation. Each hash-table entry contains
* the following user supplied parameters:
*
* 1. An optional integral parameter 'code'. This is useful for
* enumerating a symbol or for describing what type of data
* or function is stored in the symbol.
*
* 2. An optional generic function pointer. This is useful for
* associating functions with names. The user is responsible
* for casting between the generic function type and the
* actual function type. The code field could be used to
* enumerate what type of function to cast to.
*
* 3. An optional generic pointer to a static or heap-allocated
* object. It is up to the user to cast this back to the
* appropriate object type. Again, the code field could be used
* to describe what type of object is stored there.
* If the object is dynamically allocated and should be discarded
* when the symbol is deleted from the symbol table, send a
* destructor function to have it deleted automatically.
*/
typedef struct {
char *name; /* The name of the symbol */
int code; /* Application supplied integral code */
void (*fn)(void); /* Application supplied generic function */
void *data; /* Application supplied context data */
SYM_DEL_FN(*del_fn); /* Data destructor function */
} Symbol;
/*
* HashNode's and HashTable's are small objects. Separately allocating
* many such objects would normally cause memory fragmentation. To
* counter this, HashMemory objects are used. These contain
* dedicated free-lists formed from large dynamically allocated arrays
* of objects. One HashMemory object can be shared between multiple hash
* tables (within a single thread).
*/
typedef struct HashMemory HashMemory;
/* Create a free-list for allocation of hash tables and their nodes */
HashMemory *_new_HashMemory(int hash_count, int node_count);
/* Delete a redundant free-list if not being used */
HashMemory *_del_HashMemory(HashMemory *mem, int force);
/*
* Declare an alias for the private HashTable structure defined in
* hash.c.
*/
typedef struct HashTable HashTable;
/*
* Enumerate case-sensitivity options.
*/
typedef enum {
IGNORE_CASE, /* Ignore case when looking up symbols */
HONOUR_CASE /* Honor case when looking up symbols */
} HashCase;
/* Create a new hash-table */
HashTable *_new_HashTable(HashMemory *mem, int size, HashCase hcase,
void *app_data, HASH_DEL_FN(*del_fn));
/* Delete a reference to a hash-table */
HashTable *_del_HashTable(HashTable *hash);
/* Add an entry to a hash table */
Symbol *_new_HashSymbol(HashTable *hash, const char *key, int code,
void (*fn)(void), void *data, SYM_DEL_FN(*del_fn));
/* Remove and delete all the entries in a given hash table */
int _clear_HashTable(HashTable *hash);
/* Remove and delete a given hash-table entry */
Symbol *_del_HashSymbol(HashTable *hash, const char *key);
/* Lookup a given hash-table entry */
Symbol *_find_HashSymbol(HashTable *hash, const char *key);
/* Execute a given function on each entry of a hash table, returning */
/* before completion if the specified function returns non-zero. */
#define HASH_SCAN_FN(fn) int (fn)(Symbol *sym, void *context)
int _scan_HashTable(HashTable *hash, HASH_SCAN_FN(*scan_fn), void *context);
#endif
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