/*
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* Copyright (c) 2014, Linaro Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License Version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef HANDLE_H
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#define HANDLE_H
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struct handle_db {
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void **ptrs;
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unsigned max_ptrs;
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};
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#define HANDLE_DB_INITIALIZER { NULL, 0 }
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/*
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* Frees all internal data structures of the database, but does not free
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* the db pointer. The database is safe to reuse after it's destroyed, it
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* just be empty again.
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*/
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void handle_db_destroy(struct handle_db *db);
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/*
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* Allocates a new handle and assigns the supplied pointer to it,
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* ptr must not be NULL.
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* The function returns
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* >= 0 on success and
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* -1 on failure
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*/
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int handle_get(struct handle_db *db, void *ptr);
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/*
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* Deallocates a handle. Returns the associated pointer of the handle
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* the the handle was valid or NULL if it's invalid.
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*/
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void *handle_put(struct handle_db *db, int handle);
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/*
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* Returns the associated pointer of the handle if the handle is a valid
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* handle.
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* Returns NULL on failure.
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*/
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void *handle_lookup(struct handle_db *db, int handle);
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#endif /*HANDLE_H*/
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