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

Copyright (c) 1987  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.


Copyright 1987 by Digital Equipment Corporation, Maynard, 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 name of Digital 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.

Copyright 1992, 1993 Data General Corporation;
Copyright 1992, 1993 OMRON Corporation  

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
neither the name OMRON or DATA GENERAL be used in advertising or publicity
pertaining to distribution of the software without specific, written prior
permission of the party whose name is to be used.  Neither OMRON or 
DATA GENERAL make any representation about the suitability of this software
for any purpose.  It is provided "as is" without express or implied warranty.  

OMRON AND DATA GENERAL EACH DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
IN NO EVENT SHALL OMRON OR DATA GENERAL 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.

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

/* $XConsortium: extension.c,v 1.3 94/04/17 21:15:49 rob 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"
#include "mtxlock.h"
#include "message.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 void (* ReplySwapVector[256]) ();
#ifndef XTHREADS
extern void WriteEventsToClient();
#endif /* not XTHREADS */

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

ExtensionEntry *AddExtension(name, NumEvents, NumErrors, MainProc, 
			      SwappedMainProc, CloseDownProc, MinorOpcodeProc)
    char *name;
    int NumEvents;
    int NumErrors;
    int (* MainProc)();
    int (* SwappedMainProc)();
    void (* CloseDownProc)();
    unsigned short (* MinorOpcodeProc)();
{
    int i;
    register ExtensionEntry *ext, **newexts;

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

    ext = (ExtensionEntry *) xalloc(sizeof(ExtensionEntry));
    if (!ext)
	return((ExtensionEntry *) NULL);
    ext->name = (char *)xalloc(strlen(name) + 1);
    ext->num_aliases = 0;
    ext->aliases = (char **)NULL;
    if (!ext->name)
    {
	xfree(ext);
	return((ExtensionEntry *) NULL);
    }
    strcpy(ext->name,  name);
    i = NumExtensions;
    newexts = (ExtensionEntry **) xrealloc(extensions,
					   (i + 1) * sizeof(ExtensionEntry *));
    if (!newexts)
    {
	xfree(ext->name);
	xfree(ext);
	return((ExtensionEntry *) NULL);
    }
    NumExtensions++;
    extensions = newexts;
    extensions[i] = ext;
    ext->index = i;
    ext->base = i + EXTENSION_BASE;
    ext->CloseDown = CloseDownProc;
    ext->MinorOpcode = MinorOpcodeProc;
    ProcVector[i + EXTENSION_BASE] = MainProc;
    SwappedProcVector[i + EXTENSION_BASE] = SwappedMainProc;
    if (NumEvents)
    {
        ext->eventBase = lastEvent;
	ext->eventLast = lastEvent + NumEvents;
	lastEvent += NumEvents;
    }
    else
    {
        ext->eventBase = 0;
        ext->eventLast = 0;
    }
    if (NumErrors)
    {
        ext->errorBase = lastError;
	ext->errorLast = lastError + NumErrors;
	lastError += NumErrors;
    }
    else
    {
        ext->errorBase = 0;
        ext->errorLast = 0;
    }
    return(ext);
}

Bool AddExtensionAlias(alias, ext)
    char *alias;
    ExtensionEntry *ext;
{
    char *name;
    char **aliases;

    aliases = (char **)xrealloc(ext->aliases,
				(ext->num_aliases + 1) * sizeof(char *));
    if (!aliases)
	return FALSE;
    ext->aliases = aliases;
    name = (char *)xalloc(strlen(alias) + 1);
    if (!name)
	return FALSE;
    strcpy(name,  alias);
    ext->aliases[ext->num_aliases] = name;
    ext->num_aliases++;
    return TRUE;
}

unsigned short
StandardMinorOpcode(client)
    ClientPtr client;
{
    return ((xReq *)client->requestBuffer)->data;
}

unsigned short
MinorOpcodeOfRequest(client)
    ClientPtr client;
{
    unsigned char major;

    major = ((xReq *)client->requestBuffer)->reqType;
    if (major < EXTENSION_BASE)
	return 0;
    major -= EXTENSION_BASE;
    if (major >= NumExtensions)
	return 0;
    return (*extensions[major]->MinorOpcode)(client);
}

void
CloseDownExtensions()
{
    register int i,j;

    for (i = NumExtensions - 1; i >= 0; i--)
    {
	(* extensions[i]->CloseDown)(extensions[i]);
	NumExtensions = i;
	xfree(extensions[i]->name);
	for (j = extensions[i]->num_aliases; --j >= 0;)
	    xfree(extensions[i]->aliases[j]);
	xfree(extensions[i]->aliases);
	xfree(extensions[i]);
    }
    xfree(extensions);
    extensions = (ExtensionEntry **)NULL;
    lastEvent = EXTENSION_EVENT_BASE;
    lastError = FirstExtensionError;
    for (i=0; i<MAXSCREENS; i++)
    {
	register ScreenProcEntry *spentry = &AuxillaryScreenProcs[i];

	while (spentry->num)
	{
	    spentry->num--;
	    xfree(spentry->procList[spentry->num].name);
	}
	xfree(spentry->procList);
	spentry->procList = (ProcEntryPtr)NULL;
    }
}


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

    REQUEST_FIXED_SIZE(xQueryExtensionReq, stuff->nbytes);
    
    MTX_REP_CHECK_RETURN(reply,BadAlloc);

    MTX_REP_LOCK_PENDING_OPERATION_QUEUE(client, CM_XQueryExtension);

    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((char *)&stuff[1], extensions[i]->name,
			  (int)stuff->nbytes))
                 break;
	    for (j = extensions[i]->num_aliases; --j >= 0;)
	    {
		if ((strlen(extensions[i]->aliases[j]) == stuff->nbytes) &&
		     !strncmp((char *)&stuff[1], extensions[i]->aliases[j],
			      (int)stuff->nbytes))
		     break;
	    }
	    if (j >= 0) 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);

    MTX_UNLOCK_PENDING_OPERATION_QUEUE(client);
    return(client->noClientException);
}

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

    REQUEST(xReq);
    REQUEST_SIZE_MATCH(xReq);

    MTX_REP_CHECK_RETURN(reply,BadAlloc);

    MTX_REP_LOCK_PENDING_OPERATION_QUEUE(client, CM_XListExtensions);

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

    if ( NumExtensions > 0)
    {
        register int i, j;

        for (i=0;  i<NumExtensions; i++)
	{
	    total_length += strlen(extensions[i]->name) + 1;
	    reply->nExtensions += extensions[i]->num_aliases;
	    for (j = extensions[i]->num_aliases; --j >= 0;)
		total_length += strlen(extensions[i]->aliases[j]) + 1;
	}
        reply->length = (total_length + 3) >> 2;
	buffer = bufptr = (char *)MTX_LOCAL_ALLOC(total_length);
	if (!buffer)
	{
	    MTXReturnPooledMessage;
	    MTX_UNLOCK_PENDING_OPERATION_QUEUE(client);
	    return(BadAlloc);
	}
        for (i=0;  i<NumExtensions; i++)
        {
	    int len;
            *bufptr++ = len = strlen(extensions[i]->name);
	    memmove(bufptr, extensions[i]->name,  len);
	    bufptr += len;
	    for (j = extensions[i]->num_aliases; --j >= 0;)
	    {
		*bufptr++ = len = strlen(extensions[i]->aliases[j]);
		memmove(bufptr, extensions[i]->aliases[j],  len);
		bufptr += len;
	    }
	}
    }
#ifndef XTHREADS
    WriteReplyToClient(client, sizeof(xListExtensionsReply), reply);
#endif /* not XTHREADS */
    if (reply->length > 0)
    {
#ifndef XTHREADS
        WriteToClient(client, total_length, buffer);
    	DEALLOCATE_LOCAL(buffer);
#else /* XTHREADS */
	msg->pReplyData = buffer;
	msg->freeReplyData = TRUE;
	msg->lenReplyData = total_length;
#endif /* not XTHREADS */
    }
#ifdef XTHREADS
    SendReplyToClient(client, msg);
#endif /* XTHREADS */

    MTX_UNLOCK_PENDING_OPERATION_QUEUE(client);
    return(client->noClientException);
}


ExtensionLookupProc 
LookupProc(name, pGC)
    char *name;
    GCPtr pGC;
{
    register int i;
    register 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;
}

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

Bool
RegisterScreenProc(name, pScreen, proc)
    char *name;
    ScreenPtr pScreen;
    ExtensionLookupProc proc;
{
    register ScreenProcEntry *spentry;
    register ProcEntryPtr procEntry = (ProcEntryPtr)NULL;
    char *newname;
    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
    {
	newname = (char *)xalloc(strlen(name)+1);
	if (!newname)
	    return FALSE;
	procEntry = (ProcEntryPtr)
			    xrealloc(spentry->procList,
				     sizeof(ProcEntryRec) * (spentry->num+1));
	if (!procEntry)
	{
	    xfree(newname);
	    return FALSE;
	}
	spentry->procList = procEntry;
        procEntry += spentry->num;
        procEntry->name = newname;
        strcpy(newname, name);
        procEntry->proc = proc;
        spentry->num++;        
    }
    return TRUE;
}