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#ifndef lint
static char *rcsid = "$Id: cachedatom.c,v 1.9 1994/05/17 04:48:01 ishisone Rel $";
#endif
/*
* Copyright (c) 1991 Software Research Associates, 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 Software Research Associates not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. Software Research
* Associates makes no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
* Author: Makoto Ishisone, Software Research Associates, Inc., Japan
*
* neither R5 Xlib nor Xmu doesn't do what I want, so I wrote one myself.
*/
#include <X11/Intrinsic.h>
#include "CachedAtom.h"
#define DEBUG_VAR debug_cachedatom
#include "DebugPrint.h"
typedef struct _atomrec_ {
Atom atom; /* atom number */
Display *dpy;
String name; /* for obtaining atom name */
struct _atomrec_ *nextOfName; /* next element of atom name list */
struct _atomrec_ *nextOfNumber; /* next element of atom number list */
} CachedAtomRec;
typedef struct _cAtomNameRec_ {
String name; /* atom name */
CachedAtomRec atomrec; /* caution: not a pointer! */
struct _cAtomNameRec_ *next; /* next entry of the same hash value */
} CachedAtomNameRec;
#define NAMEHASHSIZE 128
#define NUMBERHASHSIZE 128
static CachedAtomNameRec *nameHash[NAMEHASHSIZE];
/* for searching by name */
static CachedAtomRec *numberHash[NUMBERHASHSIZE];
/* for searching by number */
/*
* iternal functions
*/
static int
nameHashFunc(s)
String s;
{
register String sp = s;
register int c, sum;
sum = 0;
while ((c = *sp++) != '\0') sum += c;
return (sum ^ (sp - s)) % NAMEHASHSIZE;
}
#define numberHashFunc(atom) ((int)((atom) % NUMBERHASHSIZE))
static CachedAtomRec *
newAtomRec(dpy, atom, arp, nrp)
Display *dpy;
Atom atom;
CachedAtomRec *arp; /* NULL (create new rec) or &nrp->atomrec */
CachedAtomNameRec *nrp;
{
int hashvalue;
if (arp == NULL) arp = XtNew(CachedAtomRec);
arp->atom = atom;
arp->dpy = dpy;
arp->name = nrp->name;
if (arp == &(nrp->atomrec)) {
arp->nextOfName = NULL;
} else {
arp->nextOfName = nrp->atomrec.nextOfName;
nrp->atomrec.nextOfName = arp;
}
/* insert it in numberHash */
hashvalue = numberHashFunc(atom);
arp->nextOfNumber = numberHash[hashvalue];
numberHash[numberHashFunc(atom)] = arp;
return arp;
}
static CachedAtomNameRec *
newNameRec(name, hashvalue)
String name;
int hashvalue;
{
CachedAtomNameRec *nrp = XtNew(CachedAtomNameRec);
nrp->name = XtNewString(name);
nrp->next = nameHash[hashvalue];
nameHash[hashvalue] = nrp;
return nrp;
}
/*
* public functions
*/
Atom
CachedInternAtom(dpy, name, exists)
Display *dpy;
char *name;
Bool exists;
{
int hashvalue = nameHashFunc(name);
CachedAtomNameRec *nrp = nameHash[hashvalue];
Atom atom;
TRACE(("CachedInternAtom(name:%s)... ", name));
while (nrp != NULL) {
if (!strcmp(nrp->name, name)) {
CachedAtomRec *arp = &(nrp->atomrec);
do {
if (arp->dpy == dpy) {
TRACE(("found in the cache (%ld)\n", arp->atom));
return arp->atom;
}
arp = arp->nextOfName;
} while (arp != NULL);
TRACE(("not in the cache\n"));
if ((atom = XInternAtom(dpy, name, exists)) == None) return None;
(void)newAtomRec(dpy, atom, (CachedAtomRec *)NULL, nrp);
return atom;
}
nrp = nrp->next;
}
TRACE(("not in the cache\n"));
if ((atom = XInternAtom(dpy, name, exists)) == None) return None;
nrp = newNameRec(name, hashvalue);
(void)newAtomRec(dpy, atom, &(nrp->atomrec), nrp);
return atom;
}
String
CachedGetAtomName(dpy, atom)
Display *dpy;
Atom atom;
{
int hashvalue = numberHashFunc(atom);
CachedAtomRec *arp = numberHash[hashvalue];
CachedAtomNameRec *nrp;
String name;
TRACE(("CachedGetAtomName(atom=%ld)... ", atom));
while (arp != NULL) {
if (arp->atom == atom && arp->dpy == dpy) {
TRACE(("found in the cache (%s)\n", arp->name));
return arp->name;
}
arp = arp->nextOfNumber;
}
TRACE(("not in the cache\n"));
if ((name = XGetAtomName(dpy, atom)) == NULL) return NULL;
hashvalue = nameHashFunc(name);
nrp = newNameRec(name, hashvalue);
XFree(name);
(void)newAtomRec(dpy, atom, &(nrp->atomrec), nrp);
return nrp->name;
}
#ifdef DEBUG
void
dumpAtomCache()
{
int i;
for (i = 0; i < NAMEHASHSIZE; i++) {
CachedAtomNameRec *nrp = nameHash[i];
int n = 0;
while (nrp != NULL) {
n++;
nrp = nrp->next;
}
printf("nameHash[%3d]: %d\n", i, n);
}
for (i = 0; i < NUMBERHASHSIZE; i++) {
CachedAtomRec *arp = numberHash[i];
int n = 0;
while (arp != NULL) {
n++;
arp = arp->nextOfNumber;
}
printf("numberHash[%3d]: %d\n", i, n);
}
}
#endif
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