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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libvcodex/Vcwindow/vcwopen.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	"vcwhdr.h"

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/*	Open a handle for computing matching windows.

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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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Vcwindow_t* vcwopen(Vcwdisc_t* disc, Vcwmethod_t* meth)

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#else

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Vcwindow_t* vcwopen(disc, meth)

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Vcwdisc_t*	disc;

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Vcwmethod_t*	meth;	/* window matching method	*/

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#endif

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{

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	Vcwindow_t*	vcw;

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	if(!disc || (!disc->srcf && !disc->tarf) )

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		return NIL(Vcwindow_t*);

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	if(disc->srcf && sfseek(disc->srcf, (Sfoff_t)0, 0) < 0)

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		return NIL(Vcwindow_t*);

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	if(disc->tarf && sfseek(disc->tarf, (Sfoff_t)0, 0) < 0)

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		return NIL(Vcwindow_t*);

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	if(!meth)

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		meth = Vcwdecode;

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	if(!(vcw = (Vcwindow_t*)calloc(1,sizeof(Vcwindow_t))) )

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		return NIL(Vcwindow_t*);

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	vcw->disc = disc;

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	vcw->meth = meth;

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	vcw->mtdata = NIL(Void_t*);

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	if(disc->eventf && (*disc->eventf)(vcw, VCW_OPENING, 0, disc) < 0)

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	{	vcwclose(vcw);

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		return NIL(Vcwindow_t*);

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	}

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	if(meth->eventf && (*meth->eventf)(vcw, VCW_OPENING) < 0)

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	{	vcwclose(vcw);

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		return NIL(Vcwindow_t*);

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	}

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	return vcw;

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}

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