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/*
* NetCosm - a MUD server
* Copyright (C) 2016 Franklin Wei
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "globals.h"
#include "room.h"
/* Objects belong to an object class. Objects define their object
* class through the class name, which is converted to a class ID
* internally.
*/
typedef struct child_data user_t;
struct object_t;
struct obj_class_t {
const char *class_name;
/* write an object's user data to disk */
void (*hook_serialize)(int fd, struct object_t*);
/* read an object's user data */
void (*hook_deserialize)(int fd, struct object_t*);
/* called when an object is taken;
* true = can take
* false = can't take
* no function (NULL) = can take */
bool (*hook_take)(struct object_t*, user_t *user);
bool (*hook_drop)(struct object_t*, user_t *user);
void (*hook_destroy)(struct object_t*); // free resources
const char* (*hook_desc)(struct object_t*, user_t*); // get object description
void *(*hook_dupdata)(struct object_t *obj); // duplicate the userdata pointer
};
typedef uint64_t obj_id;
struct obj_alias_t {
char *alias;
struct obj_alias_t *next;
};
/* world modules should not instantiate this directly, use obj_new()
* instead also, fields marked with 'protected' should not be modified
* by the world module */
struct object_t {
obj_id id; // protected
/* the object name needs to be freeable with free(), and should
* not be modified by the world module after being added to a
* room */
char *name;
struct obj_class_t *class; // protected
size_t n_alias;
struct obj_alias_t *alias_list; // protected
bool hidden; /* whether to list in room description */
bool default_article; /* whether or not to use 'a' or 'an' when describing this */
void *userdata;
unsigned refcount; // protected
};
/* returns a new object of class 'c' */
struct object_t *obj_new(const char *c);
/* serialize an object */
void obj_write(int fd, struct object_t *obj);
/* deserialize an object */
struct object_t *obj_read(int fd);
/* this adds a reference to an object, DOES NOT COPY */
struct object_t *obj_dup(struct object_t *obj);
/* makes a new object with a new ID, but with the same data fields as
* the original */
struct object_t *obj_copy(struct object_t *obj);
/* decrements an object's reference count; frees the object if there
* are no more references to it */
void obj_free(void*);
/* shut down the obj_* module */
void obj_shutdown(void);
/* internal use */
obj_id obj_get_idcounter(void);
void obj_set_idcounter(obj_id);
/* compare two objects */
int obj_compare(const void *a, const void *b);
/* count the number of non-alias objects in the given multimap */
size_t obj_count_noalias(const void *multimap);
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