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Xtutil.c

/**
 * Copyright 1993 Network Computing Devices, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name Network Computing Devices, Inc. not be
 * used in advertising or publicity pertaining to distribution of this
 * software without specific, written prior permission.
 *
 * THIS SOFTWARE IS PROVIDED 'AS-IS'.  NETWORK COMPUTING DEVICES, INC.,
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT
 * LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NONINFRINGEMENT.  IN NO EVENT SHALL NETWORK
 * COMPUTING DEVICES, INC., BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING
 * SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF USE, DATA,
 * OR PROFITS, EVEN IF ADVISED OF THE POSSIBILITY THEREOF, AND REGARDLESS OF
 * WHETHER IN AN ACTION IN CONTRACT, TORT OR NEGLIGENCE, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * $NCDId: @(#)Xtutil.c,v 1.10 1994/09/19 22:39:32 greg Exp $
 *
 * This file contains utilities for writing Xt programs.
 */

#include <X11/Intrinsic.h>
#include <audio/Alibint.h>
#include "Xtutil.h"

/*
 * AuXtErrorJump - Point to which an error handler can return to have 
 * the audio handling code exit cleanly to the Xt event loop.
 */

jmp_buf AuXtErrorJump;

typedef struct
{
    AuServer       *aud;
    XtAppContext    app_context;
    AuBool          syncWorkProcActive,
                    eventEnqWorkProcActive;
    XtWorkProcId    syncWorkProcId,
                    eventEnqWorkProcId;
}               PrivData;


/* ARGSUSED */
void
AuXtHandleAudioEvents(XtPointer closure, int *pfd, XtInputId *pinputid)
{
    AuServer       *aud = (AuServer *) closure;

    if (setjmp(AuXtErrorJump))
      return;

    AuHandleEvents(aud);
}

static Boolean
_au_xt_syncWorkProc(XtPointer data)
{
    PrivData       *priv = (PrivData *) data;

    if (setjmp(AuXtErrorJump))
      return True;

    AuFlush(priv->aud);
    priv->syncWorkProcActive = AuFalse;
    return True;
}

static Boolean
_au_xt_eventEnqWorkProc(XtPointer data)
{
    PrivData       *priv = (PrivData *) data;

    if (setjmp(AuXtErrorJump))
      return True;
  
    AuHandleEvents(priv->aud);
    priv->eventEnqWorkProcActive = AuFalse;
    return True;
}

/* ARGSUSED */
static void
_au_xt_synchandler(AuServer *aud, AuSyncHandlerRec *handler, XtPointer data)
{
    PrivData       *priv = (PrivData *) data;

    if (!priv->syncWorkProcActive)
    {
      priv->syncWorkProcId =
          XtAppAddWorkProc(priv->app_context, _au_xt_syncWorkProc, priv);
      priv->syncWorkProcActive = AuTrue;
    }
}

/* ARGSUSED */
static void
_au_xt_eventenqhandler(AuServer *aud, AuEventEnqHandlerRec *handler, 
                   AuEvent *event, XtPointer data)
{
    PrivData       *priv = (PrivData *) data;

    if (!priv->eventEnqWorkProcActive)
    {
      priv->eventEnqWorkProcId =
          XtAppAddWorkProc(priv->app_context, _au_xt_eventEnqWorkProc, priv);
      priv->eventEnqWorkProcActive = AuTrue;
    }
}

typedef struct _HandlerRec
{
    AuSyncHandlerRec *sync;
    AuEventEnqHandlerRec *eenq;
    PrivData       *priv;
    XtInputId       id;
    struct _HandlerRec *next;
}               HandlerRec, *HandlerPtr;

static HandlerPtr handlerListHead,
                handlerListTail;

XtInputId
AuXtAppAddAudioHandler( XtAppContext app_context, AuServer *aud)
{
    PrivData       *priv;
    HandlerPtr      h;

    if (!(h = (HandlerPtr) Aumalloc(sizeof(HandlerRec))))
      return 0;

    if (!(priv = (PrivData *) Aumalloc(sizeof(PrivData))))
    {
      Aufree(h);
      return 0;
    }

    priv->app_context = app_context;
    priv->aud = aud;
    priv->syncWorkProcActive = AuFalse;
    priv->eventEnqWorkProcActive = AuFalse;

    if (!(h->sync =
        AuRegisterSyncHandler(aud, _au_xt_synchandler, (AuPointer) priv)))
    {
      Aufree(h);
      Aufree(priv);
      return 0;
    }

    if (!(h->eenq =
        AuRegisterEventEnqHandler(aud, AuEventEnqueuedByReply,
                         _au_xt_eventenqhandler, (AuPointer) priv)))
    {
      AuUnregisterSyncHandler(aud, h->sync);
      Aufree(h);
      Aufree(priv);
      return 0;
    }

    if (!(h->id = XtAppAddInput(app_context, AuServerConnectionNumber(aud),
                        (XtPointer) XtInputReadMask,
                        AuXtHandleAudioEvents, (XtPointer) aud)))
    {
      AuUnregisterEventEnqHandler(aud, h->eenq);
      AuUnregisterSyncHandler(aud, h->sync);
      Aufree(h);
      Aufree(priv);
      return 0;
    }

    h->priv = priv;
    h->next = NULL;

    if (!handlerListTail)
      handlerListHead = handlerListTail = h;
    else
    {
      handlerListTail->next = h;
      handlerListTail = h;
    }

    return h->id;
}

void
AuXtAppRemoveAudioHandler(AuServer *aud, XtInputId id)
{
    HandlerPtr      h = handlerListHead,
                    p = NULL;

    while (h)
    {
      if (h->priv->aud == aud && h->id == id)
          break;

      p = h;
      h = h->next;
    }

    if (!h)
      return;

    if (p)
      p->next = h->next;
    else
      handlerListHead = h->next;

    if (!h->next)
      handlerListTail = p;

    if (h->priv->eventEnqWorkProcActive)
      XtRemoveWorkProc(h->priv->eventEnqWorkProcId);

    if (h->priv->syncWorkProcActive)
      XtRemoveWorkProc(h->priv->syncWorkProcId);

    XtRemoveInput(id);
    AuUnregisterEventEnqHandler(aud, h->eenq);
    AuUnregisterSyncHandler(aud, h->sync);
    Aufree(h->priv);
    Aufree(h);
}

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