dist/src/Convert.c

/* $Xorg: Convert.c,v 1.5 2001/02/09 02:03:54 xorgcvs Exp $ */

/***********************************************************
Copyright 1993 Sun Microsystems, Inc.  All rights reserved.

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 (including the next
paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.

Copyright 1987, 1988 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.

******************************************************************/
/* $XFree86: xc/lib/Xt/Convert.c,v 3.7 2001/12/14 19:56:09 dawes Exp $ */

/*

Copyright 1987, 1988, 1998  The Open Group

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.

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
OPEN GROUP 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 Open Group 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 Open Group.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include	"IntrinsicI.h"
#include	"StringDefs.h"
#include	"Intrinsic.h"

/* Conversion procedure hash table */

#define CONVERTHASHSIZE	((unsigned)256)
#define CONVERTHASHMASK	255
#define ProcHash(from_type, to_type) (2 * (from_type) + to_type)

typedef struct _ConverterRec *ConverterPtr;
typedef struct _ConverterRec {
    ConverterPtr	next;
    XrmRepresentation	from, to;
    XtTypeConverter	converter;
    XtDestructor	destructor;
    unsigned short	num_args;
    unsigned int	do_ref_count:1;
    unsigned int	new_style:1;
    unsigned int	global:1;
    char		cache_type;
} ConverterRec;

#define ConvertArgs(p) ((XtConvertArgList)((p)+1))

/* used for old-style type converter cache only */
static Heap globalHeap = {NULL, NULL, 0};

void _XtSetDefaultConverterTable(
	ConverterTable *table)
{
    register ConverterTable globalConverterTable;

    LOCK_PROCESS;
    globalConverterTable = _XtGetProcessContext()->globalConverterTable;

    *table = (ConverterTable)
	__XtCalloc(CONVERTHASHSIZE, (unsigned)sizeof(ConverterPtr));
    _XtAddDefaultConverters(*table);

    if (globalConverterTable) {
	ConverterPtr rec;
	int i;
	XtCacheType cache_type;
	for (i = CONVERTHASHSIZE; --i >= 0; ) {
	    for (rec = *globalConverterTable++; rec; rec = rec->next) {
		cache_type = rec->cache_type;
		if (rec->do_ref_count)
		    cache_type |= XtCacheRefCount;
	       _XtTableAddConverter(*table, rec->from, rec->to, rec->converter,
				    ConvertArgs(rec), rec->num_args,
				    rec->new_style, cache_type,
				    rec->destructor, True);
	    }
  	}
    }
    UNLOCK_PROCESS;
}

void _XtFreeConverterTable(
	ConverterTable table)
{
	register Cardinal i;
	register ConverterPtr p;

	for (i = 0; i < CONVERTHASHSIZE; i++) {
	    for (p = table[i]; p; ) {
		register ConverterPtr next = p->next;
		XtFree((char*)p);
		p = next;
	    }
	}
	XtFree((char*)table);
}

/* Data cache hash table */

typedef struct _CacheRec *CachePtr;

typedef struct _CacheRec {
    CachePtr	next;
    XtPointer	tag;
    int		hash;
    XtTypeConverter converter;
    unsigned short num_args;
    unsigned int conversion_succeeded:1;
    unsigned int has_ext:1;
    unsigned int is_refcounted:1;
    unsigned int must_be_freed:1;
    unsigned int from_is_value:1;
    unsigned int to_is_value:1;
    XrmValue	from;
    XrmValue	to;
} CacheRec;

typedef struct _CacheRecExt {
    CachePtr	*prev;
    XtDestructor destructor;
    XtPointer	 closure;
    long	 ref_count;
} CacheRecExt;

#define CEXT(p) ((CacheRecExt *)((p)+1))
#define CARGS(p) ((p)->has_ext ? (XrmValue *)(CEXT(p)+1) : (XrmValue *)((p)+1))

#define CACHEHASHSIZE	256
#define CACHEHASHMASK	255
typedef CachePtr CacheHashTable[CACHEHASHSIZE];

static CacheHashTable	cacheHashTable;

void _XtTableAddConverter(
    ConverterTable	table,
    XrmRepresentation   from_type,
    XrmRepresentation   to_type,
    XtTypeConverter	converter,
    XtConvertArgList    convert_args,
    Cardinal		num_args,
    _XtBoolean		new_style,
    XtCacheType		cache_type,
    XtDestructor	destructor,
    _XtBoolean		global)
{
    register ConverterPtr	*pp;
    register ConverterPtr	p;
    XtConvertArgList args;

    pp= &table[ProcHash(from_type, to_type) & CONVERTHASHMASK];
    while ((p = *pp) && (p->from != from_type || p->to != to_type))
	pp = &p->next;

    if (p) {
	*pp = p->next;
	XtFree((char *)p);
    }

    p = (ConverterPtr) __XtMalloc(sizeof(ConverterRec) +
				sizeof(XtConvertArgRec) * num_args);
    p->next	    = *pp;
    *pp = p;
    p->from	    = from_type;
    p->to	    = to_type;
    p->converter    = converter;
    p->destructor   = destructor;
    p->num_args     = num_args;
    p->global       = global;
    args = ConvertArgs(p);
    while (num_args--)
	*args++ = *convert_args++;
    p->new_style    = new_style;
    p->do_ref_count = False;
    if (destructor || (cache_type & 0xff)) {
	p->cache_type = cache_type & 0xff;
	if (cache_type & XtCacheRefCount)
	    p->do_ref_count = True;
    } else {
	p->cache_type = XtCacheNone;
    }
}

void XtSetTypeConverter(
    register _Xconst char* from_type,
    register _Xconst char* to_type,
    XtTypeConverter	converter,
    XtConvertArgList    convert_args,
    Cardinal		num_args,
    XtCacheType		cache_type,
    XtDestructor	destructor
    )
{
    ProcessContext process;
    XtAppContext app;
    XrmRepresentation from;
    XrmRepresentation to;

    LOCK_PROCESS;
    process = _XtGetProcessContext();
    app = process->appContextList;
    from = XrmStringToRepresentation(from_type);
    to = XrmStringToRepresentation(to_type);

    if (!process->globalConverterTable) {
	process->globalConverterTable = (ConverterTable)
	    __XtCalloc(CONVERTHASHSIZE, (unsigned)sizeof(ConverterPtr));
    }
    _XtTableAddConverter(process->globalConverterTable, from, to,
			 converter, convert_args,
			 num_args, True, cache_type, destructor, True);
    while (app) {
	_XtTableAddConverter(app->converterTable, from, to,
			     converter, convert_args,
			     num_args, True, cache_type, destructor, True);
	app = app->next;
    }
    UNLOCK_PROCESS;
}

void XtAppSetTypeConverter(
    XtAppContext	app,
    register _Xconst char* from_type,
    register _Xconst char* to_type,
    XtTypeConverter	converter,
    XtConvertArgList    convert_args,
    Cardinal		num_args,
    XtCacheType		cache_type,
    XtDestructor	destructor
    )
{
    LOCK_PROCESS;
    _XtTableAddConverter(app->converterTable,
	XrmStringToRepresentation(from_type),
        XrmStringToRepresentation(to_type),
	converter, convert_args, num_args,
	True, cache_type, destructor, False);
    UNLOCK_PROCESS;
}

/* old interface */
void XtAddConverter(
    register _Xconst char* from_type,
    register _Xconst char* to_type,
    XtConverter		converter,
    XtConvertArgList    convert_args,
    Cardinal		num_args
    )
{
    ProcessContext process;
    XtAppContext app;
    XrmRepresentation from;
    XrmRepresentation to;

    LOCK_PROCESS;
    process = _XtGetProcessContext();
    app = process->appContextList;
    from = XrmStringToRepresentation(from_type);
    to = XrmStringToRepresentation(to_type);

    if (!process->globalConverterTable) {
	process->globalConverterTable = (ConverterTable)
	    __XtCalloc(CONVERTHASHSIZE, (unsigned)sizeof(ConverterPtr));
    }
    _XtTableAddConverter(process->globalConverterTable, from, to,
			 (XtTypeConverter)converter, convert_args, num_args,
			 False, XtCacheAll, (XtDestructor)NULL, True);
    while (app) {
	_XtTableAddConverter(app->converterTable, from, to,
			     (XtTypeConverter)converter, convert_args,
			     num_args, False, XtCacheAll, (XtDestructor)NULL,
			     True);
	app = app->next;
    }
    UNLOCK_PROCESS;
}

/* old interface */
void XtAppAddConverter(
    XtAppContext	app,
    register _Xconst char* from_type,
    register _Xconst char* to_type,
    XtConverter		converter,
    XtConvertArgList    convert_args,
    Cardinal		num_args
    )
{
    LOCK_PROCESS;
    _XtTableAddConverter(app->converterTable,
	XrmStringToRepresentation(from_type),
        XrmStringToRepresentation(to_type),
	(XtTypeConverter)converter, convert_args, num_args,
	False, XtCacheAll, (XtDestructor)NULL, False);
    UNLOCK_PROCESS;
}

static CachePtr
CacheEnter(
    Heap*		    heap,
    register XtTypeConverter converter,
    register XrmValuePtr    args,
    Cardinal		    num_args,
    XrmValuePtr		    from,
    XrmValuePtr		    to,
    Boolean		    succeeded,
    register int	    hash,
    Boolean		    do_ref,
    Boolean		    do_free,
    XtDestructor	    destructor,
    XtPointer		    closure)
{
    register	CachePtr *pHashEntry;
    register	CachePtr p;
    register    Cardinal i;

    LOCK_PROCESS;
    pHashEntry = &cacheHashTable[hash & CACHEHASHMASK];

    if ((succeeded && destructor) || do_ref) {
	p = (CachePtr) _XtHeapAlloc(heap, (sizeof(CacheRec) +
					   sizeof(CacheRecExt) +
					   num_args * sizeof(XrmValue)));
	CEXT(p)->prev = pHashEntry;
	CEXT(p)->destructor = succeeded ? destructor : NULL;
	CEXT(p)->closure = closure;
	CEXT(p)->ref_count = 1;
	p->has_ext = True;
    }
    else {
	p = (CachePtr)_XtHeapAlloc(heap, (sizeof(CacheRec) +
					  num_args * sizeof(XrmValue)));
	p->has_ext = False;
    }
    if (!to->addr)
	succeeded = False;
    p->conversion_succeeded = succeeded;
    p->is_refcounted = do_ref;
    p->must_be_freed = do_free;
    p->next	    = *pHashEntry;
    if (p->next && p->next->has_ext)
	CEXT(p->next)->prev = &p->next;

    *pHashEntry     = p;
    p->tag	    = (XtPointer)heap;
    p->hash	    = hash;
    p->converter    = converter;
    p->from.size    = from->size;
    if (from->size <= sizeof(p->from.addr)) {
	p->from_is_value = True;
	XtMemmove(&p->from.addr, from->addr, from->size);
    } else {
	p->from_is_value = False;
	p->from.addr = (XPointer)_XtHeapAlloc(heap, from->size);
	(void) memmove((char *)p->from.addr, (char *)from->addr, from->size);
    }
    p->num_args = num_args;
    if (num_args) {
	XrmValue *pargs = CARGS(p);
	for (i = 0; i < num_args; i++) {
	    pargs[i].size = args[i].size;
	    pargs[i].addr = (XPointer)_XtHeapAlloc(heap, args[i].size);
	    XtMemmove(pargs[i].addr, args[i].addr, args[i].size);
	}
    }
    p->to.size = to->size;
    if (!succeeded) {
	p->to_is_value = False;
	p->to.addr = NULL;
    } else if (to->size <= sizeof(p->to.addr)) {
	p->to_is_value = True;
	XtMemmove(&p->to.addr, to->addr, to->size);
    } else {
	p->to_is_value = False;
	p->to.addr = (XPointer)_XtHeapAlloc(heap, to->size);
	(void) memmove((char *)p->to.addr, (char *)to->addr, to->size);
    }
    UNLOCK_PROCESS;
    return p;
}

static void FreeCacheRec(
    XtAppContext app,
    CachePtr p,
    CachePtr *prev)
{
    LOCK_PROCESS;
    if (p->has_ext) {
	if (CEXT(p)->destructor) {
	    Cardinal num_args = p->num_args;
	    XrmValue *args = NULL;
	    XrmValue toc;
	    if (num_args)
		args = CARGS(p);
	    toc.size = p->to.size;
	    if (p->to_is_value)
		toc.addr = (XPointer)&p->to.addr;
	    else
		toc.addr = p->to.addr;
	    (*CEXT(p)->destructor) (app, &toc, CEXT(p)->closure, args,
				    &num_args);
	}
	*(CEXT(p)->prev) = p->next;
	if (p->next && p->next->has_ext)
	    CEXT(p->next)->prev = CEXT(p)->prev;
    } else {
	*prev = p->next;
	if (p->next && p->next->has_ext)
	    CEXT(p->next)->prev = prev;
    }
    if (p->must_be_freed) {
	register int i;
	if (!p->from_is_value)
	    XtFree(p->from.addr);
	if ((i = p->num_args)) {
	    XrmValue *pargs = CARGS(p);
	    while (i--)
		XtFree(pargs[i].addr);
	}
	if (!p->to_is_value)
	    XtFree(p->to.addr);
	XtFree((char*)p);
    }
    /* else on private heap; will free entire heap later */
    UNLOCK_PROCESS;
}


void _XtCacheFlushTag(
    XtAppContext app,
    XtPointer	tag)
{
    int i;
    register CachePtr *prev;
    register CachePtr rec;

    LOCK_PROCESS;
    for (i = CACHEHASHSIZE; --i >= 0;) {
	prev = &cacheHashTable[i];
	while ((rec = *prev)) {
	    if (rec->tag == tag)
		FreeCacheRec(app, rec, prev);
	    else
		prev = &rec->next;
	}
    }
    UNLOCK_PROCESS;
}

#ifdef DEBUG
#include	<stdio.h>

void _XtConverterCacheStats(void)
{
    register Cardinal i;
    register CachePtr p;
    register Cardinal entries;

    LOCK_PROCESS;
    for (i = 0; i < CACHEHASHSIZE; i++) {
	p = cacheHashTable[i];
	if (p) {
	    for (entries = 0; p; p = p->next) {
		entries++;
	    }
	    (void) fprintf(stdout, "Index: %4d  Entries: %d\n", i, entries);
	    for (p = cacheHashTable[i]; p; p = p->next) {
		(void) fprintf(stdout, "    Size: %3d  Refs: %3d  '",
			       p->from.size,
			       p->has_ext ? CEXT(p)->ref_count : 0);
		(void) fprintf(stdout, "'\n");
	    }
	    (void) fprintf(stdout, "\n");
	}
    }
    UNLOCK_PROCESS;
}
#endif /*DEBUG*/

static Boolean ResourceQuarkToOffset(
    WidgetClass widget_class,
    XrmName     name,
    Cardinal    *offset)
{
    register WidgetClass     wc;
    register Cardinal        i;
    register XrmResourceList res, *resources;

    for (wc = widget_class; wc; wc = wc->core_class.superclass) {
	resources = (XrmResourceList*) wc->core_class.resources;
	for (i = 0; i < wc->core_class.num_resources; i++, resources++) {
	    res = *resources;
	    if (res->xrm_name == name) {
		*offset = -res->xrm_offset - 1;
		return True;
	    }
	} /* for i in resources */
    } /* for wc in widget classes */
    (*offset) = 0;
    return False;
}


static void ComputeArgs(
    Widget		widget,
    XtConvertArgList    convert_args,
    Cardinal		num_args,
    XrmValuePtr		args)
{
    register Cardinal   i;
    Cardinal		offset;
    String              params[1];
    Cardinal		num_params = 1;
    Widget		ancestor = NULL;

    for (i = 0; i < num_args; i++) {
	args[i].size = convert_args[i].size;
	switch (convert_args[i].address_mode) {
	case XtAddress:
	    args[i].addr = convert_args[i].address_id;
	    break;

	case XtBaseOffset:
	    args[i].addr =
		(XPointer)((char *)widget + (long)convert_args[i].address_id);
	    break;

	case XtWidgetBaseOffset:
	    if (!ancestor) {
		if (XtIsWidget(widget))
		    ancestor = widget;
		else
		    ancestor = _XtWindowedAncestor(widget);
	    }

	    args[i].addr =
		(XPointer)((char *)ancestor + (long)convert_args[i].address_id);
	    break;

	case XtImmediate:
	    args[i].addr = (XPointer) &(convert_args[i].address_id);
	    break;

	case XtProcedureArg:
	    (*(XtConvertArgProc)convert_args[i].address_id)
		(widget, &convert_args[i].size, &args[i]);
	    break;

	case XtResourceString:
	    /* Convert in place for next usage */
	    convert_args[i].address_mode = XtResourceQuark;
	    convert_args[i].address_id =
	       (XtPointer)(long)XrmStringToQuark((String)convert_args[i].address_id);
	    /* Fall through */

	case XtResourceQuark:
	    if (! ResourceQuarkToOffset(widget->core.widget_class,
		    (XrmQuark)(long) convert_args[i].address_id, &offset)) {
		params[0]=
                  XrmQuarkToString((XrmQuark)(long) convert_args[i].address_id);
               XtAppWarningMsg(XtWidgetToApplicationContext(widget),
		    "invalidResourceName","computeArgs",XtCXtToolkitError,
		    "Cannot find resource name %s as argument to conversion",
                     params,&num_params);
		offset = 0;
	    }
	    args[i].addr = (XPointer)((char *)widget + offset);
	    break;
	default:
	    params[0] = XtName(widget);
	    XtAppWarningMsg(XtWidgetToApplicationContext(widget),
		"invalidAddressMode", "computeArgs", XtCXtToolkitError,
		"Conversion arguments for widget '%s' contain an unsupported address mode",
			params,&num_params);
	    args[i].addr = NULL;
	    args[i].size = 0;
	} /* switch */
    } /* for */
} /* ComputeArgs */

void XtDirectConvert(
    XtConverter     converter,
    XrmValuePtr     args,
    Cardinal	    num_args,
    register XrmValuePtr from,
    XrmValuePtr     to)
{
    register CachePtr   p;
    register int	hash;
    register Cardinal   i;

    LOCK_PROCESS;
    /* Try to find cache entry for conversion */
    hash = ((long) converter >> 2) + from->size + *((char *) from->addr);
    if (from->size > 1) hash += ((char *) from->addr)[1];

    for (p = cacheHashTable[hash & CACHEHASHMASK]; p; p = p->next) {
	if ((p->hash == hash)
	 && (p->converter == (XtTypeConverter)converter)
	 && (p->from.size == from->size)
	 && !(p->from_is_value ?
	      XtMemcmp(&p->from.addr, from->addr, from->size) :
	      memcmp((char *)p->from.addr, (char *)from->addr, from->size))
         && (p->num_args == num_args)) {
	    if ((i = num_args)) {
		XrmValue *pargs = CARGS(p);
		/* Are all args the same data ? */
		while (i) {
		    i--; /* do not move to while test, broken compilers */
		    if (pargs[i].size != args[i].size ||
			XtMemcmp(pargs[i].addr, args[i].addr, args[i].size)) {
			i++;
			break;
		    }
		}
	    }
	    if (!i) {
		/* Perfect match */
		to->size = p->to.size;
		if (p->to_is_value)
		    to->addr = (XPointer)&p->to.addr;
		else
		    to->addr = p->to.addr;
		UNLOCK_PROCESS;
		return;
	    }
	}
    }

    /* Didn't find it, call converter procedure and entry result in cache */
    (*to).size = 0;
    (*to).addr = NULL;
    (*converter)(args, &num_args, from, to);
    /* This memory can never be freed since we don't know the Display
     * or app context from which to compute the persistance */
    {
	CacheEnter(&globalHeap, (XtTypeConverter)converter, args, num_args,
		   from, to, (to->addr != NULL), hash, False, False,
		   (XtDestructor)NULL, NULL);
    }
    UNLOCK_PROCESS;
}


static ConverterPtr GetConverterEntry(
    XtAppContext app,
    XtTypeConverter converter)
{
    Cardinal entry;
    register ConverterPtr cP;
    ConverterTable converterTable;

    LOCK_PROCESS;
    converterTable = app->converterTable;
    cP = NULL;
    for (entry = 0; (entry < CONVERTHASHSIZE) && !cP; entry++) {
	cP = converterTable[entry];
	while (cP && (cP->converter != converter)) cP = cP->next;
    }
    UNLOCK_PROCESS;
    return cP;
}


static Boolean
CallConverter(
    Display*	    dpy,
    XtTypeConverter converter,
    XrmValuePtr     args,
    Cardinal	    num_args,
    register XrmValuePtr from,
    XrmValuePtr     to,
    XtCacheRef	    *cache_ref_return,
    register ConverterPtr cP)
{
    CachePtr p;
    int	hash;
    Cardinal i;
    Boolean retval;

    if (!cP || ((cP->cache_type == XtCacheNone) && !cP->destructor)) {
	XtPointer closure;
	if (cache_ref_return) *cache_ref_return = NULL;
	retval = (*(XtTypeConverter)converter)
	    (dpy, args, &num_args, from, to, &closure);
	return retval;
    }

    LOCK_PROCESS;
    /* Try to find cache entry for conversion */
    hash = ((long)(converter) >> 2) + from->size + *((char *) from->addr);
    if (from->size > 1) hash += ((char *) from->addr)[1];

    if (cP->cache_type != XtCacheNone) {
	for (p = cacheHashTable[hash & CACHEHASHMASK]; p; p = p->next){
	    if ((p->hash == hash)
	     && (p->converter == converter)
	     && (p->from.size == from->size)
	     && !(p->from_is_value ?
		  XtMemcmp(&p->from.addr, from->addr, from->size) :
		  memcmp((char *)p->from.addr, (char *)from->addr, from->size))
	     && (p->num_args == num_args)) {
		if ((i = num_args)) {
		    XrmValue *pargs = CARGS(p);
		    /* Are all args the same data ? */
		    while (i) {
			i--; /* do not move to while test, broken compilers */
			if (pargs[i].size != args[i].size ||
			    XtMemcmp(pargs[i].addr, args[i].addr, args[i].size)){
			    i++;
			    break;
			}
		    }
		}
		if (!i) {
		    /* Perfect match */
		    if (p->conversion_succeeded) {
			if (to->addr) {	/* new-style call */
			    if (to->size < p->to.size) {
				to->size = p->to.size;
				UNLOCK_PROCESS;
				return False;
			    }
			    to->size = p->to.size;
			    if (p->to_is_value) {
				XtMemmove(to->addr, &p->to.addr,
					  to->size);
			    } else {
				(void) memmove((char *)to->addr,
					       (char *)p->to.addr, to->size);
			    }
			} else {	/* old-style call */
			    to->size = p->to.size;
			    if (p->to_is_value)
				to->addr = (XPointer)&p->to.addr;
			    else
				to->addr = p->to.addr;
			}
		    }
		    if (p->is_refcounted) {
			CEXT(p)->ref_count++;
			if (cache_ref_return)
			    *cache_ref_return = (XtCacheRef)p;
			else
			    p->is_refcounted = False;
		    }
		    else {
			if (cache_ref_return)
			    *cache_ref_return = NULL;
		    }
		    retval = (p->conversion_succeeded);
		    UNLOCK_PROCESS;
		    return retval;
		}
	    }
	}
    }

    /* No cache entry, call converter procedure and enter result in cache */
    {
	Heap *heap;
	XtPointer closure = NULL;
	unsigned int supplied_size = to->size;
	Boolean do_ref = cP->do_ref_count && cache_ref_return;
	Boolean do_free = False;
	Boolean retval =
	    (*(XtTypeConverter)converter)(dpy, args, &num_args, from, to, &closure);

	if (retval == False && supplied_size < to->size) {
	    /* programmer error: caller must allocate sufficient storage */
	    if (cache_ref_return)
		*cache_ref_return = NULL;
	    UNLOCK_PROCESS;
	    return False;
	}

	if ((cP->cache_type == XtCacheNone) || do_ref) {
	    heap = NULL;
	    do_free = True;
	}
	else if (cP->cache_type == XtCacheByDisplay)
	    heap = &_XtGetPerDisplay(dpy)->heap;
	else if (cP->global)
	    heap = &globalHeap;
	else
	    heap = &XtDisplayToApplicationContext(dpy)->heap;

	p = CacheEnter(heap, converter, args, num_args, from, to, retval,
		       hash, do_ref, do_free, cP->destructor, closure);
	if (do_ref)
	    *cache_ref_return = (XtCacheRef)p;
	else if (cache_ref_return)
	    *cache_ref_return = NULL;
	UNLOCK_PROCESS;
	return retval;
    }
}

Boolean
XtCallConverter(
    Display*	    dpy,
    XtTypeConverter converter,
    XrmValuePtr     args,
    Cardinal	    num_args,
    register XrmValuePtr from,
    XrmValuePtr     to,
    XtCacheRef	    *cache_ref_return)
{
    ConverterPtr cP;
    Boolean retval;
    XtAppContext app = XtDisplayToApplicationContext(dpy);

    LOCK_APP(app);
    if ((cP = GetConverterEntry(app, converter)) == NULL) {
	XtAppSetTypeConverter(XtDisplayToApplicationContext(dpy),
			      "_XtUnk1", "_XtUnk2",
			      converter, NULL, 0,
			      XtCacheAll, NULL);
	cP = GetConverterEntry(app, converter);
    }
    retval = CallConverter(dpy, converter, args, num_args, from, to,
			    cache_ref_return, cP);
    UNLOCK_APP(app);
    return retval;
}

Boolean _XtConvert(
             Widget		widget,
    register XrmRepresentation	from_type,
	     XrmValuePtr	from,
    register XrmRepresentation	to_type,
    register XrmValuePtr	to,
    XtCacheRef			*cache_ref_return)
{
    XtAppContext	app = XtWidgetToApplicationContext(widget);
    register ConverterPtr	p;
    Cardinal		num_args;
    XrmValue		*args;

    /* Look for type converter */
    LOCK_PROCESS;
    p = app->converterTable[ProcHash(from_type, to_type) & CONVERTHASHMASK];
    for (; p; p = p->next) {
	if (from_type == p->from && to_type == p->to) {
	    Boolean retval = False;
	    /* Compute actual arguments from widget and arg descriptor */
	    num_args = p->num_args;
	    if (num_args != 0) {
		args = (XrmValue*)
		    ALLOCATE_LOCAL( num_args * sizeof (XrmValue) );
		if (!args) _XtAllocError("alloca");
		ComputeArgs(widget, ConvertArgs(p), num_args, args);
	    } else args = NULL;
	    if (p->new_style) {
		retval =
		    CallConverter(XtDisplayOfObject(widget),
				     p->converter, args, num_args,
				     from, to, cache_ref_return, p);
	    }
	    else { /* is old-style (non-display) converter */
		XrmValue tempTo;
		XtDirectConvert((XtConverter)p->converter, args, num_args,
				from, &tempTo);
		if (cache_ref_return)
		    *cache_ref_return = NULL;
		if (tempTo.addr) {
		    if (to->addr) {	/* new-style caller */
			if (to->size >= tempTo.size) {
			    if (to_type == _XtQString)
				*(String*)(to->addr) = tempTo.addr;
			    else {
				XtMemmove(to->addr, tempTo.addr,
					  tempTo.size);
			    }
			    retval = True;
			}
			to->size = tempTo.size;
		    } else {		/* old-style caller */
			*to = tempTo;
			retval = True;
		    }
		}
	    }
	    if (args) DEALLOCATE_LOCAL( (XtPointer)args );
	    UNLOCK_PROCESS;
	    return retval;
	}
    }

    {
	String params[2];
	Cardinal num_params = 2;
	params[0] = XrmRepresentationToString(from_type);
	params[1] = XrmRepresentationToString(to_type);
	XtAppWarningMsg(app, "typeConversionError", "noConverter", XtCXtToolkitError,
	     "No type converter registered for '%s' to '%s' conversion.",
             params, &num_params);
    }
    UNLOCK_PROCESS;
    return False;
}

void XtConvert(
    Widget	widget,
    _Xconst char* from_type_str,
    XrmValuePtr	from,
    _Xconst char* to_type_str,
    XrmValuePtr	to)
{
    XrmQuark    from_type, to_type;
    WIDGET_TO_APPCON(widget);

    LOCK_APP(app);
    from_type = XrmStringToRepresentation(from_type_str);
    to_type = XrmStringToRepresentation(to_type_str);
    if (from_type != to_type) {
	/*  It's not safe to ref count these resources, 'cause we
	    don't know what older clients may have assumed about
	    the resource lifetimes.
	XtCacheRef ref;
	*/
	to->addr = NULL;
	to->size = 0;
	_XtConvert(widget, from_type, from, to_type, to, /*&ref*/ NULL);
	/*
	if (ref) {
	    XtAddCallback( widget, XtNdestroyCallback,
			   XtCallbackReleaseCacheRef, (XtPointer)ref );
	}
	*/
    }
    else
	(*to) = *from;
    UNLOCK_APP(app);
}

Boolean XtConvertAndStore(
    Widget	object,
    _Xconst char* from_type_str,
    XrmValuePtr	from,
    _Xconst char* to_type_str,
    XrmValuePtr	to)
{
    XrmQuark    from_type, to_type;
    WIDGET_TO_APPCON(object);

    LOCK_APP(app);
    LOCK_PROCESS;
    from_type = XrmStringToRepresentation(from_type_str);
    to_type = XrmStringToRepresentation(to_type_str);
    if (from_type != to_type) {
	static XtPointer local_valueP = NULL;
	static Cardinal local_valueS = 128;
	XtCacheRef ref;
	Boolean local = False;
	do {
	    if (!to->addr) {
		if (!local_valueP)
		    local_valueP = _XtHeapAlloc(&globalHeap, local_valueS);
		to->addr = local_valueP;
		to->size = local_valueS;
		local = True;
	    }
	    if (!_XtConvert(object, from_type, from, to_type, to, &ref)) {
		if (local && (to->size > local_valueS)) {
		    to->addr =
			local_valueP = _XtHeapAlloc(&globalHeap, to->size);
		    local_valueS = to->size;
		    continue;
		} else {
		    if (local) {
			to->addr = NULL;
			to->size = 0;
		    }
		    UNLOCK_PROCESS;
		    UNLOCK_APP(app);
		    return False;
		}
	    }
	    if (ref) {
		XtAddCallback( object, XtNdestroyCallback,
			       XtCallbackReleaseCacheRef, (XtPointer)ref );
	    }
	    UNLOCK_PROCESS;
	    UNLOCK_APP(app);
	    return True;
	} while (local /* && local_valueS < to->size */);
    }
    if (to->addr) {
	if (to->size < from->size) {
	    to->size = from->size;
	    UNLOCK_PROCESS;
	    UNLOCK_APP(app);
	    return False;
	}
	(void) memmove(to->addr, from->addr, from->size );
	to->size = from->size;
    } else			/* from_type == to_type */
	*to = *from;
    UNLOCK_PROCESS;
    UNLOCK_APP(app);
    return True;
}

void XtAppReleaseCacheRefs(
    XtAppContext app,
    XtCacheRef *refs)
{
    register CachePtr *r;
    register CachePtr p;

    LOCK_APP(app);
    LOCK_PROCESS;
    for (r = (CachePtr*)refs; (p = *r); r++) {
	if (p->is_refcounted && --(CEXT(p)->ref_count) == 0) {
	    FreeCacheRec(app, p, NULL);
	}
    }
    UNLOCK_PROCESS;
    UNLOCK_APP(app);
}


/* ARGSUSED */
void XtCallbackReleaseCacheRefList(
    Widget widget,		/* unused */
    XtPointer closure,
    XtPointer call_data)	/* unused */
{
    XtAppReleaseCacheRefs( XtWidgetToApplicationContext(widget),
			   (XtCacheRef*)closure );
    XtFree(closure);
}


/* ARGSUSED */
void XtCallbackReleaseCacheRef(
    Widget widget,		/* unused */
    XtPointer closure,
    XtPointer call_data)	/* unused */
{
    XtCacheRef cache_refs[2];
    cache_refs[0] = (XtCacheRef)closure;
    cache_refs[1] = NULL;
    XtAppReleaseCacheRefs( XtWidgetToApplicationContext(widget), cache_refs );
}