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/***********************************************************
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
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 names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/
/* $Header: /var/lib/cvsd/repos/research/researchv9/X11/src/X.V11R1/server/dix/extension.c,v 1.1.1.1 2018/04/24 17:22:00 root Exp $ */

#include "X.h"
#define NEED_REPLIES
#include "Xproto.h"
#include "misc.h"
#include "dixstruct.h"
#include "extnsionst.h"
#include "gcstruct.h"
#include "scrnintstr.h"

#define EXTENSION_BASE  128
#define EXTENSION_EVENT_BASE  64
#define LAST_EVENT  128
#define LAST_ERROR 255

ScreenProcEntry AuxillaryScreenProcs[MAXSCREENS];

static ExtensionEntry **extensions = (ExtensionEntry **)NULL;
extern int (* ProcVector[]) ();
extern int (* SwappedProcVector[]) ();
extern int (* ReplySwapVector[256]) ();

int lastEvent = EXTENSION_EVENT_BASE;
static int lastError = FirstExtensionError;
static int NumExtensions = 0;

ExtensionEntry *AddExtension(name, NumEvents, NumErrors, MainProc, 
			      SwappedMainProc, CloseDownProc)
    char *name;
    int NumEvents;
    int NumErrors;
    int (* MainProc)();
    int (* SwappedMainProc)();
    void (* CloseDownProc)();
{
    int i;

    if (!MainProc || !SwappedMainProc || !CloseDownProc)
        return((ExtensionEntry *) NULL);
    if ((lastEvent + NumEvents > LAST_EVENT) || 
	        (unsigned)(lastError + NumErrors > LAST_ERROR))
        return((ExtensionEntry *) NULL);

    i = NumExtensions;
    NumExtensions += 1;
    extensions = (ExtensionEntry **) Xrealloc(extensions,
			      NumExtensions * sizeof(ExtensionEntry *));
    extensions[i] = (ExtensionEntry *) Xalloc(sizeof(ExtensionEntry));
    extensions[i]->name = (char *)Xalloc(strlen(name) + 1);
    strcpy(extensions[i]->name,  name);
    extensions[i]->index = i;
    extensions[i]->base = i + EXTENSION_BASE;
    extensions[i]->CloseDown = CloseDownProc;
    ProcVector[i + EXTENSION_BASE] = MainProc;
    SwappedProcVector[i + EXTENSION_BASE] = SwappedMainProc;
    if (NumEvents)
    {
        extensions[i]->eventBase = lastEvent;
	extensions[i]->eventLast = lastEvent + NumEvents;
	lastEvent += NumEvents;
    }
    else
    {
        extensions[i]->eventBase = 0;
        extensions[i]->eventLast = 0;
    }
    if (NumErrors)
    {
        extensions[i]->errorBase = lastError;
	extensions[i]->errorLast = lastError + NumErrors;
	lastError += NumErrors;
    }
    else
    {
        extensions[i]->errorBase = 0;
        extensions[i]->errorLast = 0;
    }
    return(extensions[i]);
}

CloseDownExtensions()
{
    register int i;

    for (i = 0; i < NumExtensions; i++)
    {
	(* extensions[i]->CloseDown)(extensions[i]);
	Xfree(extensions[i]->name);
	Xfree(extensions[i]);
    }
    Xfree(extensions);
    NumExtensions = 0;
    extensions = (ExtensionEntry **)NULL;
    lastEvent = EXTENSION_EVENT_BASE;
    lastError = FirstExtensionError;
}



int
ProcQueryExtension(client)
    ClientPtr client;
{
    xQueryExtensionReply reply;
    int i;
    REQUEST(xQueryExtensionReq);

    REQUEST_AT_LEAST_SIZE(xQueryExtensionReq);
    
    reply.type = X_Reply;
    reply.length = 0;
    reply.major_opcode = 0;
    reply.sequenceNumber = client->sequence;

    if ( ! NumExtensions )
        reply.present = xFalse;
    else
    {
        for (i=0; i<NumExtensions; i++)
	{
            if ((strlen(extensions[i]->name) == stuff->nbytes) &&
                 !strncmp(&stuff[1], extensions[i]->name, stuff->nbytes))
                 break;
	}
        if (i == NumExtensions)
            reply.present = xFalse;
        else
        {            
            reply.present = xTrue;
	    reply.major_opcode = extensions[i]->base;
	    reply.first_event = extensions[i]->eventBase;
	    reply.first_error = extensions[i]->errorBase;
	}
    }
    WriteReplyToClient(client, sizeof(xQueryExtensionReply), &reply);
    return(client->noClientException);
}

int
ProcListExtensions(client)
    ClientPtr client;
{
    xListExtensionsReply reply;
    char *bufptr, *buffer;
    int total_length = 0;

    REQUEST(xReq);
    REQUEST_SIZE_MATCH(xReq);

    reply.type = X_Reply;
    reply.nExtensions = NumExtensions;
    reply.length = 0;
    reply.sequenceNumber = client->sequence;
    buffer = NULL;

    if ( NumExtensions )
    {
        register int i;	

        for (i=0;  i<NumExtensions; i++)
	    total_length += strlen(extensions[i]->name) + 1;

        reply.length = (total_length + 3) >> 2;
	buffer = bufptr = (char *)ALLOCATE_LOCAL(total_length);
        for (i=0;  i<NumExtensions; i++)
        {
	    int len;
            *bufptr++ = len = strlen(extensions[i]->name);
	    bcopy(extensions[i]->name, bufptr,  len);
	    bufptr += len;
	}
    }
    WriteReplyToClient(client, sizeof(xListExtensionsReply), &reply);
    if (reply.length)
    {
        WriteToClient(client, total_length, buffer);
    	DEALLOCATE_LOCAL(buffer);
    }
    return(client->noClientException);
}


ExtensionLookupProc 
LookupProc(name, pGC)
    char *name;
    GCPtr pGC;
{
    register int i;
    ScreenProcEntry spentry;
    spentry  = AuxillaryScreenProcs[pGC->pScreen->myNum];
    if (spentry.num)    
    {
        for (i = 0; i < spentry.num; i++)
            if (strcmp(name, spentry.procList[i].name) == 0)
                return(spentry.procList[i].proc);
    }
    return (ExtensionLookupProc)NULL;
}

void
RegisterProc(name, pGC, proc)
    char *name;
    GC *pGC;
    ExtensionLookupProc proc;
{
    RegisterScreenProc(name, pGC->pScreen, proc);
}

void
RegisterScreenProc(name, pScreen, proc)
    char *name;
    ScreenPtr pScreen;
    ExtensionLookupProc proc;
{
    ScreenProcEntry *spentry;
    ProcEntryPtr procEntry = (ProcEntryPtr)NULL;
    int i;

    spentry = &AuxillaryScreenProcs[pScreen->myNum];
    /* first replace duplicates */
    if (spentry->num)
    {
        for (i = 0; i < spentry->num; i++)
            if (strcmp(name, spentry->procList[i].name) == 0)
	    {
                procEntry = &spentry->procList[i];
		break;
	    }
    }
    if (procEntry)
        procEntry->proc = proc;
    else
    {
	if (spentry->num)
	    spentry->procList = (ProcEntryPtr)
		Xrealloc(spentry->procList,
		    sizeof(ProcEntryRec) * (spentry->num+1));
	else
	    spentry->procList = (ProcEntryPtr)
		Xalloc(sizeof(ProcEntryRec));
        procEntry = &spentry->procList[spentry->num];
        procEntry->name = (char *)Xalloc(strlen(name)+1);
        strcpy(procEntry->name, name);
        procEntry->proc = proc;
        spentry->num++;        
    }
}


 /*****************
  * SendErrorToClient
  *    Send an Error back to the client.
  *****************/

 SendErrorToClient (client, reqCode, minorCode, resId, status)
     ClientPtr client;
     char reqCode, minorCode, status;
     XID resId;
 {
     xError rep;

     rep.type = X_Error;
     rep.sequenceNumber = client->sequence;
     rep.errorCode = status;
     rep.majorCode = reqCode;
     rep.minorCode = minorCode;
     rep.resourceID = resId;

#ifdef notdef
     ErrorF("SendErrorToClient %x\n", client->index);
     ErrorF("    sequenceNumber = %d\n", rep.sequenceNumber);
     ErrorF("    rep.errorCode= %d\n", rep.errorCode);
     ErrorF("    rep.majorCode = %d\n", rep.majorCode);
     ErrorF("    rep.resourceID = %x\n", rep.resourceID);
#endif

     WriteEventsToClient (client, 1, (pointer) &rep);
}

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