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/*
* Copyright (c) 2014, Linaro Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 2 as
* published by the Free Software Foundation.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef HANDLE_H
#define HANDLE_H
struct handle_db {
void **ptrs;
unsigned max_ptrs;
};
#define HANDLE_DB_INITIALIZER { NULL, 0 }
/*
* Frees all internal data structures of the database, but does not free
* the db pointer. The database is safe to reuse after it's destroyed, it
* just be empty again.
*/
void handle_db_destroy(struct handle_db *db);
/*
* Allocates a new handle and assigns the supplied pointer to it,
* ptr must not be NULL.
* The function returns
* >= 0 on success and
* -1 on failure
*/
int handle_get(struct handle_db *db, void *ptr);
/*
* Deallocates a handle. Returns the associated pointer of the handle
* the the handle was valid or NULL if it's invalid.
*/
void *handle_put(struct handle_db *db, int handle);
/*
* Returns the associated pointer of the handle if the handle is a valid
* handle.
* Returns NULL on failure.
*/
void *handle_lookup(struct handle_db *db, int handle);
#endif /*HANDLE_H*/
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