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72 lines
1.8 KiB
72 lines
1.8 KiB
/**
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* \file
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* Get an interface implementation from a implementation structure.
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*
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* \author Georg Hopp
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*
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* \copyright
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* Copyright © 2012 Georg Hopp
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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 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include "tr/interface.h"
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#include "tr/commons.h"
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/**
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* Compare interfaces.
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* Used with bsearch on the interfaces.
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*/
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static
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inline
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int
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comp(const void * _a, const void * _b)
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{
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const struct interface * a = **(const struct interface ***)_a;
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const struct interface * b = **(const struct interface ***)_b;
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return ((a)<(b))? -1 : ((a)>(b))? 1 : 0;
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}
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/**
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* Get a specific interface implementation from the interface
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* implementation from a class.
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*/
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TR_iface_ptr
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TR_interfaceGet(TR_iface_impl_ptr iface_impl, const TR_iface_ptr _iface)
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{
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const TR_iface_ptr * iface = &_iface;
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TR_iface_ptr * found;
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if (! iface_impl->simpl) {
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qsort(
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(void**)(iface_impl->impl),
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iface_impl->nimpl,
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sizeof(TR_iface_ptr), comp);
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iface_impl->simpl=TRUE;
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}
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found = bsearch(
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&iface,
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iface_impl->impl,
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iface_impl->nimpl,
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sizeof(TR_iface_ptr),
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comp);
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return found? *found : (TR_iface_ptr)NULL;
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}
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// vim: set ts=4 sw=4:
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