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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libvcodex/vcdisc.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 2003-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#include	"vchdr.h"

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/*	Change the discipline for a Vcodex_t handle.

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**

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**	Written by Kiem-Phong Vo ([email protected])

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*/

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#if __STD_C

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Vcdisc_t* vcdisc(Vcodex_t* vc, Vcdisc_t* disc)

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#else

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Vcdisc_t* vcdisc(vc, disc)

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Vcodex_t*	vc;

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Vcdisc_t*	disc;

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#endif

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{

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	Vcdisc_t	*old = vc->disc;

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	int		rv;

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	if(!vc)

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		return NIL(Vcdisc_t*);

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	/* check with incumbent to see if it's ok with the change */

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	if(old && old->eventf &&

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	   (*old->eventf)(vc, VC_DISC, (Void_t*)disc, old) < 0 )

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		return NIL(Vcdisc_t*);

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	/* now announce to method */

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	if(!vc->meth || !vc->meth->eventf)

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		rv = 0;

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	else	rv = (*vc->meth->eventf)(vc, VC_DISC, (Void_t*)disc);

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	if(rv < 0)

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		return NIL(Vcdisc_t*);

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	else if(rv == 0) /* install discipline */

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	{	vc->disc = disc;

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		return old ? old : disc;

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	}

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	else	return disc;

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}

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