/************************************************************
Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.

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 Silicon Graphics not be 
used in advertising or publicity pertaining to distribution 
of the software without specific prior written permission.
Silicon Graphics makes no representation about the suitability 
of this software for any purpose. It is provided "as is"
without any express or implied warranty.

SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS 
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
GRAPHICS 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.

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

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#elif defined(HAVE_CONFIG_H)
#include <config.h>
#endif

#include <stdio.h>
#include <X11/X.h>
#define	NEED_EVENTS
#define	NEED_REPLIES
#include <X11/Xproto.h>
#include "misc.h"
#include "inputstr.h"
#include <X11/keysym.h>
#define	XKBSRV_NEED_FILE_FUNCS
#include <xkbsrv.h>

/***====================================================================***/

#define	CORE_SYM(i)	(i<map_width?core_syms[i]:NoSymbol)
#define	XKB_OFFSET(g,l)	(((g)*groupsWidth)+(l))

int
XkbKeyTypesForCoreSymbols(	XkbDescPtr	xkb,
				int		map_width,
				KeySym *	core_syms,
				unsigned int 	protected,
    				int *		types_inout,
				KeySym *	xkb_syms_rtrn)
{
register int	i;
unsigned int	empty;
int		nSyms[XkbNumKbdGroups];
int		nGroups,tmp,groupsWidth;

    /* Section 12.2 of the protocol describes this process in more detail */
    /* Step 1:  find the # of symbols in the core mapping per group */
    groupsWidth= 2;
    for (i=0;i<XkbNumKbdGroups;i++) {
	if ((protected&(1<<i))&&(types_inout[i]<xkb->map->num_types)) {
	    nSyms[i]= xkb->map->types[types_inout[i]].num_levels;
	    if (nSyms[i]>groupsWidth)
		groupsWidth= nSyms[i];
	}
	else {
	    types_inout[i]= XkbTwoLevelIndex;	/* don't really know, yet */
	    nSyms[i]= 2;
	}
    }
    if (nSyms[XkbGroup1Index]<2)
	nSyms[XkbGroup1Index]= 2;
    if (nSyms[XkbGroup2Index]<2)
	nSyms[XkbGroup2Index]= 2;
    /* Step 2:	Copy the symbols from the core ordering to XKB ordering	*/
    /*		symbols in the core are in the order:			*/
    /*		G1L1 G1L2 G2L1 G2L2 [G1L[3-n]] [G2L[3-n]] [G3L*] [G3L*]	*/
    xkb_syms_rtrn[XKB_OFFSET(XkbGroup1Index,0)]= CORE_SYM(0);
    xkb_syms_rtrn[XKB_OFFSET(XkbGroup1Index,1)]= CORE_SYM(1);
    for (i=2;i<nSyms[XkbGroup1Index];i++) {
	xkb_syms_rtrn[XKB_OFFSET(XkbGroup1Index,i)]= CORE_SYM(2+i);
    }
    xkb_syms_rtrn[XKB_OFFSET(XkbGroup2Index,0)]= CORE_SYM(2);
    xkb_syms_rtrn[XKB_OFFSET(XkbGroup2Index,1)]= CORE_SYM(3);
    tmp= 2+(nSyms[XkbGroup1Index]-2); /* offset to extra group2 syms */
    for (i=2;i<nSyms[XkbGroup2Index];i++) {
	xkb_syms_rtrn[XKB_OFFSET(XkbGroup2Index,i)]= CORE_SYM(tmp+i);
    }
    tmp= nSyms[XkbGroup1Index]+nSyms[XkbGroup2Index];
    if ((tmp>=map_width)&&
	 ((protected&(XkbExplicitKeyType3Mask|XkbExplicitKeyType4Mask))==0)) {
	nSyms[XkbGroup3Index]= 0;
	nSyms[XkbGroup4Index]= 0;
	nGroups= 2;
    }
    else {
    	nGroups= 3;
	for (i=0;i<nSyms[XkbGroup3Index];i++,tmp++) {
	    xkb_syms_rtrn[XKB_OFFSET(XkbGroup3Index,i)]= CORE_SYM(tmp);
	}
	if ((tmp<map_width)||(protected&XkbExplicitKeyType4Mask)) {
	    nGroups= 4;
	    for (i=0;i<nSyms[XkbGroup4Index];i++,tmp++) {
		xkb_syms_rtrn[XKB_OFFSET(XkbGroup4Index,i)]= CORE_SYM(tmp);
	    }
	}
	else {
	    nSyms[XkbGroup4Index]= 0;
	}
    }
    /* steps 3&4: alphanumeric expansion,  assign canonical types */
    empty= 0;
    for (i=0;i<nGroups;i++) {
	KeySym *syms;
	syms= &xkb_syms_rtrn[XKB_OFFSET(i,0)];
	if ((nSyms[i]>1)&&(syms[1]==NoSymbol)&&(syms[0]!=NoSymbol)) {
	    KeySym upper,lower;
	    XConvertCase(syms[0],&lower,&upper);
	    if (upper!=lower) {
		xkb_syms_rtrn[XKB_OFFSET(i,0)]= lower;
		xkb_syms_rtrn[XKB_OFFSET(i,1)]= upper;
		if ((protected&(1<<i))==0)
		    types_inout[i]= XkbAlphabeticIndex;
	    }
	    else if ((protected&(1<<i))==0) {
		types_inout[i]= XkbOneLevelIndex;
	/*	nSyms[i]=	1;*/
	    }
	}
	if (((protected&(1<<i))==0)&&(types_inout[i]==XkbTwoLevelIndex)) {
	    if (IsKeypadKey(syms[0])||IsKeypadKey(syms[1]))
		types_inout[i]= XkbKeypadIndex;
	    else {
		KeySym upper,lower;
		XConvertCase(syms[0],&lower,&upper);
		if ((syms[0]==lower)&&(syms[1]==upper))
		    types_inout[i]= XkbAlphabeticIndex;
	    }
	}
	if (syms[0]==NoSymbol) {
	    register int n;
	    Bool	found;
	    for (n=1,found=False;(!found)&&(n<nSyms[i]);n++) {
		found= (syms[n]!=NoSymbol);
	    }
	    if (!found)
		empty|= (1<<i);
	}
    }
    /* step 5: squoosh out empty groups */
    if (empty) {
	for (i=nGroups-1;i>=0;i--) {
	    if (((empty&(1<<i))==0)||(protected&(1<<i)))
		break;
	    nGroups--;
	}
    }
    if (nGroups<1)
	return 0;

    /* step 6: replicate group 1 into group two, if necessary */
    if ((nGroups>1)&&((empty&(XkbGroup1Mask|XkbGroup2Mask))==XkbGroup2Mask)) {
	if ((protected&(XkbExplicitKeyType1Mask|XkbExplicitKeyType2Mask))==0) {
	    nSyms[XkbGroup2Index]= nSyms[XkbGroup1Index];
	    types_inout[XkbGroup2Index]= types_inout[XkbGroup1Index];
	    memcpy((char *)&xkb_syms_rtrn[2],(char *)xkb_syms_rtrn,
							2*sizeof(KeySym));
	}
	else if (types_inout[XkbGroup1Index]==types_inout[XkbGroup2Index]) {
	    memcpy((char *)&xkb_syms_rtrn[nSyms[XkbGroup1Index]],
	    				(char *)xkb_syms_rtrn,
					nSyms[XkbGroup1Index]*sizeof(KeySym));
	}
    }

    /* step 7: check for all groups identical or all width 1 */
    if (nGroups>1) {
	Bool sameType,allOneLevel;
	allOneLevel= (xkb->map->types[types_inout[0]].num_levels==1);
	for (i=1,sameType=True;(allOneLevel||sameType)&&(i<nGroups);i++) {
	    sameType=(sameType&&(types_inout[i]==types_inout[XkbGroup1Index]));
	    if (allOneLevel)
		allOneLevel= (xkb->map->types[types_inout[i]].num_levels==1);
	}
	if ((sameType)&&
	    (!(protected&(XkbExplicitKeyTypesMask&~XkbExplicitKeyType1Mask)))){
	    register int s;
	    Bool	identical;
	    for (i=1,identical=True;identical&&(i<nGroups);i++) {
		KeySym *syms;
		syms= &xkb_syms_rtrn[XKB_OFFSET(i,0)];
		for (s=0;identical&&(s<nSyms[i]);s++) {
		    if (syms[s]!=xkb_syms_rtrn[s])
			identical= False;
		}
	    }
	    if (identical)
		nGroups= 1;
	}
	if (allOneLevel && (nGroups>1)) {
	    KeySym *syms;
	    syms= &xkb_syms_rtrn[nSyms[XkbGroup1Index]];
	    nSyms[XkbGroup1Index]= 1;
	    for (i=1;i<nGroups;i++) {
		xkb_syms_rtrn[i]= syms[0];
		syms+= nSyms[i];
		nSyms[i]= 1;
	    }
	}
    }
    return nGroups;
}

static XkbSymInterpretPtr
_XkbFindMatchingInterp(	XkbDescPtr	xkb,
			KeySym 		sym,
			unsigned int	real_mods,
			unsigned int	level)
{
register unsigned	 i;
XkbSymInterpretPtr	 interp,rtrn;
CARD8			 mods;

    rtrn= NULL;
    interp= xkb->compat->sym_interpret;
    for (i=0;i<xkb->compat->num_si;i++,interp++) {
	if ((interp->sym==NoSymbol)||(sym==interp->sym)) {
	    int match;
	    if ((level==0)||((interp->match&XkbSI_LevelOneOnly)==0))
		 mods= real_mods;
	    else mods= 0;
	    switch (interp->match&XkbSI_OpMask) {
		case XkbSI_NoneOf:
		    match= ((interp->mods&mods)==0);
		    break;
		case XkbSI_AnyOfOrNone:
		    match= ((mods==0)||((interp->mods&mods)!=0));
		    break;
		case XkbSI_AnyOf:
		    match= ((interp->mods&mods)!=0);
		    break;
		case XkbSI_AllOf:
		    match= ((interp->mods&mods)==interp->mods);
		    break;
		case XkbSI_Exactly:
		    match= (interp->mods==mods);
		    break;
		default:
		    match= 0;
		    break;
	    }
	    if (match) {
		if (interp->sym!=NoSymbol) {
		    return interp;
		}
		else if (rtrn==NULL) {
		    rtrn= interp;
		}
	    }
	}
    }
    return rtrn;
}

static void
_XkbAddKeyChange(KeyCode *pFirst,unsigned char *pNum,KeyCode newKey)
{
KeyCode	last;

    last= (*pFirst)+(*pNum);
    if (newKey<*pFirst) {
	*pFirst= newKey;
	*pNum= (last-newKey)+1;
    }
    else if (newKey>last) {
	*pNum= (last-*pFirst)+1;
    }
    return;
}

static void
_XkbSetActionKeyMods(XkbDescPtr xkb,XkbAction *act,unsigned mods)
{
unsigned	tmp;

    switch (act->type) {
	case XkbSA_SetMods: case XkbSA_LatchMods: case XkbSA_LockMods:
	    if (act->mods.flags&XkbSA_UseModMapMods)
		act->mods.real_mods= act->mods.mask= mods;
	    if ((tmp= XkbModActionVMods(&act->mods))!=0) {
		XkbVirtualModsToReal(xkb,tmp,&tmp);
		act->mods.mask|= tmp;
	    }
	    break;
	case XkbSA_ISOLock:
	    if (act->iso.flags&XkbSA_UseModMapMods)
		act->iso.real_mods= act->iso.mask= mods;
	    if ((tmp= XkbModActionVMods(&act->iso))!=0) {
		XkbVirtualModsToReal(xkb,tmp,&tmp);
		act->iso.mask|= tmp;
	    }
	    break;
    }
    return;
}

#define	IBUF_SIZE	8

Bool
XkbApplyCompatMapToKey(XkbDescPtr xkb,KeyCode key,XkbChangesPtr changes)
{
KeySym *		syms;
unsigned char 		explicit,mods;
XkbSymInterpretPtr	*interps,ibuf[IBUF_SIZE]; 
int			n,nSyms,found;
unsigned		changed,tmp;

    if ((!xkb)||(!xkb->map)||(!xkb->map->key_sym_map)||
    			(!xkb->compat)||(!xkb->compat->sym_interpret)||
			(key<xkb->min_key_code)||(key>xkb->max_key_code)) {
	return False;
    }
    if (((!xkb->server)||(!xkb->server->key_acts))&&
		(XkbAllocServerMap(xkb,XkbAllServerInfoMask,0)!=Success)) {
	return False;
    }
    changed= 0;	/* keeps track of what has changed in _this_ call */
    explicit= xkb->server->explicit[key];
    if (explicit&XkbExplicitInterpretMask) /* nothing to do */
	return True;
    mods= (xkb->map->modmap?xkb->map->modmap[key]:0);
    nSyms= XkbKeyNumSyms(xkb,key);
    syms= XkbKeySymsPtr(xkb,key);
    if (nSyms>IBUF_SIZE) {
	interps= _XkbTypedCalloc(nSyms,XkbSymInterpretPtr);
	if (interps==NULL) {
	    interps= ibuf;
	    nSyms= IBUF_SIZE;
	}
    }
    else {
	interps= ibuf;
    }
    found= 0;
    for (n=0;n<nSyms;n++) {
	unsigned level= (n%XkbKeyGroupsWidth(xkb,key));
	interps[n]= NULL;
	if (syms[n]!=NoSymbol) {
	    interps[n]= _XkbFindMatchingInterp(xkb,syms[n],mods,level);
	    if (interps[n]&&interps[n]->act.type!=XkbSA_NoAction)
		found++;
	    else interps[n]= NULL;
	}
    }
    /* 1/28/96 (ef) -- XXX! WORKING HERE */
    if (!found) {
	if (xkb->server->key_acts[key]!=0) {
	    xkb->server->key_acts[key]= 0;
	    changed|= XkbKeyActionsMask;
	}
    }
    else {
	XkbAction *pActs;
	unsigned int	new_vmodmask;
	changed|= XkbKeyActionsMask;
	pActs= XkbResizeKeyActions(xkb,key,nSyms);
	if (!pActs) {
            if (nSyms > IBUF_SIZE)
                xfree(interps);
	    return False;
        }
	new_vmodmask= 0;
	for (n=0;n<nSyms;n++) {
	    if (interps[n]) {
		unsigned effMods;

		pActs[n]= *((XkbAction *)&interps[n]->act);
		if ((n==0)||((interps[n]->match&XkbSI_LevelOneOnly)==0)) {
		     effMods= mods;
		     if (interps[n]->virtual_mod!=XkbNoModifier)
			new_vmodmask|= (1<<interps[n]->virtual_mod);
		}
		else effMods= 0;
		_XkbSetActionKeyMods(xkb,&pActs[n],effMods);
	    }
	    else pActs[n].type= XkbSA_NoAction;
	}
	if (((explicit&XkbExplicitVModMapMask)==0)&&
				(xkb->server->vmodmap[key]!=new_vmodmask)) {
	    changed|= XkbVirtualModMapMask;
	    xkb->server->vmodmap[key]= new_vmodmask;
	}
	if (interps[0]) {
	    if ((interps[0]->flags&XkbSI_LockingKey)&&
				((explicit&XkbExplicitBehaviorMask)==0)) {
		xkb->server->behaviors[key].type= XkbKB_Lock;
		changed|= XkbKeyBehaviorsMask;
	    }
	    if (((explicit&XkbExplicitAutoRepeatMask)==0)&&(xkb->ctrls)) {
		CARD8 old;
		old= xkb->ctrls->per_key_repeat[key/8];
		if (interps[0]->flags&XkbSI_AutoRepeat)
		     xkb->ctrls->per_key_repeat[key/8]|= (1<<(key%8));
		else xkb->ctrls->per_key_repeat[key/8]&= ~(1<<(key%8));
		if (changes && (old!=xkb->ctrls->per_key_repeat[key/8]))
		    changes->ctrls.changed_ctrls|= XkbPerKeyRepeatMask;
	    }
	}
    }
    if ((!found)||(interps[0]==NULL)) {
	if (((explicit&XkbExplicitAutoRepeatMask)==0)&&(xkb->ctrls)) {
	    CARD8 old;
	    old= xkb->ctrls->per_key_repeat[key/8];
#ifdef RETURN_SHOULD_REPEAT
	    if (*XkbKeySymsPtr(xkb,key) != XK_Return)
#endif
		xkb->ctrls->per_key_repeat[key/8]|= (1<<(key%8));
	    if (changes && (old!=xkb->ctrls->per_key_repeat[key/8]))
		changes->ctrls.changed_ctrls|= XkbPerKeyRepeatMask;
	}
	if (((explicit&XkbExplicitBehaviorMask)==0)&&
		(xkb->server->behaviors[key].type==XkbKB_Lock)) {
		xkb->server->behaviors[key].type= XkbKB_Default;
		changed|= XkbKeyBehaviorsMask;
	}
    }
    if (changes) {
	XkbMapChangesPtr	mc;
	mc= &changes->map;
	tmp= (changed&mc->changed);
	if (tmp&XkbKeyActionsMask)
	    _XkbAddKeyChange(&mc->first_key_act,&mc->num_key_acts,key);
	else if (changed&XkbKeyActionsMask) {
	    mc->changed|= XkbKeyActionsMask;
	    mc->first_key_act= key;
	    mc->num_key_acts= 1;
	}
	if (tmp&XkbKeyBehaviorsMask) {
	    _XkbAddKeyChange(&mc->first_key_behavior,&mc->num_key_behaviors,
	    								key);
	}
	else if (changed&XkbKeyBehaviorsMask) {
	    mc->changed|= XkbKeyBehaviorsMask;
	    mc->first_key_behavior= key;
	    mc->num_key_behaviors= 1;
	}
	if (tmp&XkbVirtualModMapMask)
	    _XkbAddKeyChange(&mc->first_vmodmap_key,&mc->num_vmodmap_keys,key);
	else if (changed&XkbVirtualModMapMask) {
	    mc->changed|= XkbVirtualModMapMask;
	    mc->first_vmodmap_key= key;
	    mc->num_vmodmap_keys= 1;
	}
	mc->changed|= changed;
    }
    if (interps!=ibuf)
	_XkbFree(interps);
    return True;
}

Status
XkbChangeTypesOfKey(	XkbDescPtr		 xkb,
			int		 	 key,
			int			 nGroups,
			unsigned	 	 groups,
			int	* 	 	 newTypesIn,
			XkbMapChangesPtr	 changes)
{
XkbKeyTypePtr	pOldType,pNewType;
register int	i;
int		width,nOldGroups,oldWidth,newTypes[XkbNumKbdGroups];

    if ((!xkb) || (!XkbKeycodeInRange(xkb,key)) || (!xkb->map) ||
	(!xkb->map->types)||(!newTypes)||((groups&XkbAllGroupsMask)==0)||
	(nGroups>XkbNumKbdGroups)) {
	return BadMatch;
    }
    if (nGroups==0) {
	for (i=0;i<XkbNumKbdGroups;i++) {
	    xkb->map->key_sym_map[key].kt_index[i]= XkbOneLevelIndex;
	}
	i= xkb->map->key_sym_map[key].group_info;
	i= XkbSetNumGroups(i,0);
	xkb->map->key_sym_map[key].group_info= i;
	XkbResizeKeySyms(xkb,key,0);
	return Success;
    }

    nOldGroups= XkbKeyNumGroups(xkb,key);
    oldWidth= XkbKeyGroupsWidth(xkb,key);
    for (width=i=0;i<nGroups;i++) {
	if (groups&(1<<i))
	     newTypes[i]=  newTypesIn[i];
	else if (i<nOldGroups)
	     newTypes[i]= XkbKeyKeyTypeIndex(xkb,key,i);
	else if (nOldGroups>0)
	     newTypes[i]= XkbKeyKeyTypeIndex(xkb,key,XkbGroup1Index);
	else newTypes[i]= XkbTwoLevelIndex;
	if (newTypes[i]>xkb->map->num_types)
	    return BadMatch;
	pNewType= &xkb->map->types[newTypes[i]];
	if (pNewType->num_levels>width)
	    width= pNewType->num_levels;
    }
    if ((xkb->ctrls)&&(nGroups>xkb->ctrls->num_groups))
	xkb->ctrls->num_groups= nGroups;
    if ((width!=oldWidth)||(nGroups!=nOldGroups)) {
	KeySym		oldSyms[XkbMaxSymsPerKey],*pSyms;
	int		nCopy;

	if (nOldGroups==0) {
	    pSyms= XkbResizeKeySyms(xkb,key,width*nGroups);
	    if (pSyms!=NULL) {
		i= xkb->map->key_sym_map[key].group_info;
		i= XkbSetNumGroups(i,nGroups);
		xkb->map->key_sym_map[key].group_info= i;
		xkb->map->key_sym_map[key].width= width;
		for (i=0;i<nGroups;i++) {
		    xkb->map->key_sym_map[key].kt_index[i]= newTypes[i];
		}
		return Success;
	    }
	    return BadAlloc;
	}
	pSyms= XkbKeySymsPtr(xkb,key);
	memcpy(oldSyms,pSyms,XkbKeyNumSyms(xkb,key)*sizeof(KeySym));
	pSyms= XkbResizeKeySyms(xkb,key,width*nGroups);
	if (pSyms==NULL)
	    return BadAlloc;
	bzero(pSyms,width*nGroups*sizeof(KeySym));
	for (i=0;(i<nGroups)&&(i<nOldGroups);i++) {
	    pOldType= XkbKeyKeyType(xkb,key,i);
	    pNewType= &xkb->map->types[newTypes[i]];
	    if (pNewType->num_levels>pOldType->num_levels)
		 nCopy= pOldType->num_levels;
	    else nCopy= pNewType->num_levels;
	    memcpy(&pSyms[i*width],&oldSyms[i*oldWidth],nCopy*sizeof(KeySym));
	}
	if (XkbKeyHasActions(xkb,key)) {
	    XkbAction	oldActs[XkbMaxSymsPerKey],*pActs;
	    pActs= XkbKeyActionsPtr(xkb,key);
	    memcpy(oldActs,pActs,XkbKeyNumSyms(xkb,key)*sizeof(XkbAction));
	    pActs= XkbResizeKeyActions(xkb,key,width*nGroups);
	    if (pActs==NULL)
		return BadAlloc;
	    bzero(pActs,width*nGroups*sizeof(XkbAction));
	    for (i=0;(i<nGroups)&&(i<nOldGroups);i++) {
		pOldType= XkbKeyKeyType(xkb,key,i);
		pNewType= &xkb->map->types[newTypes[i]];
		if (pNewType->num_levels>pOldType->num_levels)
		     nCopy= pOldType->num_levels;
		else nCopy= pNewType->num_levels;
		memcpy(&pActs[i*width],&oldActs[i*oldWidth],
						nCopy*sizeof(XkbAction));
	    }
	}
	i= xkb->map->key_sym_map[key].group_info;
	i= XkbSetNumGroups(i,nGroups);
	xkb->map->key_sym_map[key].group_info= i;
	xkb->map->key_sym_map[key].width= width;
    }
    width= 0;
    for (i=0;i<nGroups;i++) {
	xkb->map->key_sym_map[key].kt_index[i]= newTypes[i];
	if (xkb->map->types[newTypes[i]].num_levels>width)
	    width= xkb->map->types[newTypes[i]].num_levels;
    }
    xkb->map->key_sym_map[key].width= width;
    if (changes!=NULL) {
	if (changes->changed&XkbKeySymsMask) {
	    _XkbAddKeyChange(&changes->first_key_sym,&changes->num_key_syms,
	    								key);
	}
	else {
	    changes->changed|= XkbKeySymsMask;
	    changes->first_key_sym= key;
	    changes->num_key_syms= 1;
	}
    }
    return Success;
}

/***====================================================================***/

Bool
XkbVirtualModsToReal(XkbDescPtr xkb,unsigned virtual_mask,unsigned *mask_rtrn)
{
register int i,bit;
register unsigned mask;

    if (xkb==NULL)
	return False;
    if (virtual_mask==0) {
	*mask_rtrn= 0;
	return True;
    }
    if (xkb->server==NULL)
	return False;
    for (i=mask=0,bit=1;i<XkbNumVirtualMods;i++,bit<<=1) {
	if (virtual_mask&bit)
	    mask|= xkb->server->vmods[i];
    }
    *mask_rtrn= mask;
    return True;
}

/***====================================================================***/

static Bool
XkbUpdateActionVirtualMods(XkbDescPtr xkb,XkbAction *act,unsigned changed)
{
unsigned int	tmp;

    switch (act->type) {
	case XkbSA_SetMods: case XkbSA_LatchMods: case XkbSA_LockMods:
	    if (((tmp= XkbModActionVMods(&act->mods))&changed)!=0) {
		XkbVirtualModsToReal(xkb,tmp,&tmp);
		act->mods.mask= act->mods.real_mods;
		act->mods.mask|= tmp;
		return True;
	    }
	    break;
	case XkbSA_ISOLock:
	    if ((((tmp= XkbModActionVMods(&act->iso))!=0)&changed)!=0) {
		XkbVirtualModsToReal(xkb,tmp,&tmp);
		act->iso.mask= act->iso.real_mods;
		act->iso.mask|= tmp;
		return True;
	    }
	    break;
    }
    return False;
}

static void
XkbUpdateKeyTypeVirtualMods(	XkbDescPtr	xkb,
				XkbKeyTypePtr	type,
				unsigned int	changed,
				XkbChangesPtr 	changes)
{
register unsigned int	i;
unsigned int		mask;

    XkbVirtualModsToReal(xkb,type->mods.vmods,&mask);
    type->mods.mask= type->mods.real_mods|mask;
    if ((type->map_count>0)&&(type->mods.vmods!=0)) {
	XkbKTMapEntryPtr entry;
	for (i=0,entry=type->map;i<type->map_count;i++,entry++) {
	    if (entry->mods.vmods!=0) {
		XkbVirtualModsToReal(xkb,entry->mods.vmods,&mask);
		entry->mods.mask=entry->mods.real_mods|mask;
		/* entry is active if vmods are bound*/
	    	entry->active= (mask!=0);
	    }
	    else entry->active= 1;
	}
    }
    if (changes) {
	int	type_ndx;
	type_ndx= type-xkb->map->types;
	if ((type_ndx<0)||(type_ndx>xkb->map->num_types))
	    return;
	if (changes->map.changed&XkbKeyTypesMask) {
	    int last;
	    last= changes->map.first_type+changes->map.num_types-1;
	    if (type_ndx<changes->map.first_type) {
		changes->map.first_type= type_ndx;
		changes->map.num_types= (last-type_ndx)+1;
	    }
	    else if (type_ndx>last) {
		changes->map.num_types= (type_ndx-changes->map.first_type)+1;
	    }
	}
	else {
	    changes->map.changed|= XkbKeyTypesMask;
	    changes->map.first_type= type_ndx;
	    changes->map.num_types= 1;
	}
    }
    return;
}

Bool
XkbApplyVirtualModChanges(XkbDescPtr xkb,unsigned changed,XkbChangesPtr changes)
{
register int	i;
unsigned int	checkState = 0;

    if ((!xkb) || (!xkb->map) || (changed==0))
	return False;
    for (i=0;i<xkb->map->num_types;i++) {
	if (xkb->map->types[i].mods.vmods & changed)
	XkbUpdateKeyTypeVirtualMods(xkb,&xkb->map->types[i],changed,changes);
    }
    if (changed&xkb->ctrls->internal.vmods) {
	unsigned int	newMask;
	XkbVirtualModsToReal(xkb,xkb->ctrls->internal.vmods,&newMask);
	newMask|= xkb->ctrls->internal.real_mods;
	if (xkb->ctrls->internal.mask!=newMask) {
	    xkb->ctrls->internal.mask= newMask;
	    if (changes) {
		changes->ctrls.changed_ctrls|= XkbInternalModsMask;
		checkState= True;
	    }
	}
    }
    if (changed&xkb->ctrls->ignore_lock.vmods) {
	unsigned int	newMask;
	XkbVirtualModsToReal(xkb,xkb->ctrls->ignore_lock.vmods,&newMask);
	newMask|= xkb->ctrls->ignore_lock.real_mods;
	if (xkb->ctrls->ignore_lock.mask!=newMask) {
	    xkb->ctrls->ignore_lock.mask= newMask;
	    if (changes) {
		changes->ctrls.changed_ctrls|= XkbIgnoreLockModsMask;
		checkState= True;
	    }
	}
    }
    if (xkb->indicators!=NULL) {
	XkbIndicatorMapPtr map;
	map= &xkb->indicators->maps[0];
	for (i=0;i<XkbNumIndicators;i++,map++) {
	    if (map->mods.vmods&changed) {
		unsigned int newMask;
		XkbVirtualModsToReal(xkb,map->mods.vmods,&newMask);
		newMask|= map->mods.real_mods;
		if (newMask!=map->mods.mask) {
		    map->mods.mask= newMask;
		    if (changes) {
			changes->indicators.map_changes|= (1<<i);
			checkState= True;
		    }
		}
	    }
	}
    }
    if (xkb->compat!=NULL) {
	XkbCompatMapPtr	compat;
	compat= xkb->compat;
	for (i=0;i<XkbNumKbdGroups;i++) {
	    unsigned int newMask;
	    XkbVirtualModsToReal(xkb,compat->groups[i].vmods,&newMask);
	    newMask|= compat->groups[i].real_mods;
	    if (compat->groups[i].mask!=newMask) {
		compat->groups[i].mask= newMask;
		if (changes) {
		    changes->compat.changed_groups|= (1<<i);
		    checkState= True;
		}
	    }
	}
    }
    if (xkb->map && xkb->server) {
	int highChange = 0, lowChange = -1;
	for (i=xkb->min_key_code;i<=xkb->max_key_code;i++) {
	    if (XkbKeyHasActions(xkb,i)) {
		register XkbAction *pAct;
		register int n;

		pAct= XkbKeyActionsPtr(xkb,i);
		for (n=XkbKeyNumActions(xkb,i);n>0;n--,pAct++) {
		    if ((pAct->type!=XkbSA_NoAction)&&
			XkbUpdateActionVirtualMods(xkb,pAct,changed)) {
			if (lowChange<0)
			    lowChange= i;
			highChange= i;
		    }
		}
	    }
	}
	if (changes && (lowChange>0)) { /* something changed */
	    if (changes->map.changed&XkbKeyActionsMask) {
		int last;
		if (changes->map.first_key_act<lowChange)
		    lowChange= changes->map.first_key_act;
		last= changes->map.first_key_act+changes->map.num_key_acts-1;
		if (last>highChange)
		    highChange= last;
	    }
	    changes->map.changed|= 	XkbKeyActionsMask;
	    changes->map.first_key_act=	lowChange;
	    changes->map.num_key_acts=	(highChange-lowChange)+1;
	}
    }
    return checkState;
}