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/*
* tkAtom.c --
*
* This file manages a cache of X Atoms in order to avoid
* interactions with the X server. It's much like the Xmu
* routines, except it has a cleaner interface (caller
* doesn't have to provide permanent storage for atom names,
* for example).
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
static char sccsid[] = "@(#) tkAtom.c 1.11 95/02/23 11:03:53";
#include "tkPort.h"
#include "tkInt.h"
/*
* Forward references to procedures defined in this file:
*/
static void AtomInit _ANSI_ARGS_((TkDisplay *dispPtr));
/*
*--------------------------------------------------------------
*
* Tk_InternAtom --
*
* Given a string, produce the equivalent X atom. This
* procedure is equivalent to XInternAtom, except that it
* keeps a local cache of atoms. Once a name is known,
* the server need not be contacted again for that name.
*
* Results:
* The return value is the Atom corresponding to name.
*
* Side effects:
* A new entry may be added to the local atom cache.
*
*--------------------------------------------------------------
*/
Atom
Tk_InternAtom(tkwin, name)
Tk_Window tkwin; /* Window token; map name to atom
* for this window's display. */
char *name; /* Name to turn into atom. */
{
register TkDisplay *dispPtr;
register Tcl_HashEntry *hPtr;
int new;
dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->atomInit) {
AtomInit(dispPtr);
}
hPtr = Tcl_CreateHashEntry(&dispPtr->nameTable, name, &new);
if (new) {
Tcl_HashEntry *hPtr2;
Atom atom;
atom = XInternAtom(dispPtr->display, name, False);
Tcl_SetHashValue(hPtr, atom);
hPtr2 = Tcl_CreateHashEntry(&dispPtr->atomTable, (char *) atom,
&new);
Tcl_SetHashValue(hPtr2, Tcl_GetHashKey(&dispPtr->nameTable, hPtr));
}
return (Atom) Tcl_GetHashValue(hPtr);
}
/*
*--------------------------------------------------------------
*
* Tk_GetAtomName --
*
* This procedure is equivalent to XGetAtomName except that
* it uses the local atom cache to avoid contacting the
* server.
*
* Results:
* The return value is a character string corresponding to
* the atom given by "atom". This string's storage space
* is static: it need not be freed by the caller, and should
* not be modified by the caller. If "atom" doesn't exist
* on tkwin's display, then the string "?bad atom?" is returned.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
char *
Tk_GetAtomName(tkwin, atom)
Tk_Window tkwin; /* Window token; map atom to name
* relative to this window's
* display. */
Atom atom; /* Atom whose name is wanted. */
{
register TkDisplay *dispPtr;
register Tcl_HashEntry *hPtr;
dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->atomInit) {
AtomInit(dispPtr);
}
hPtr = Tcl_FindHashEntry(&dispPtr->atomTable, (char *) atom);
if (hPtr == NULL) {
char *name;
Tk_ErrorHandler handler;
int new, mustFree;
handler= Tk_CreateErrorHandler(dispPtr->display, BadAtom,
-1, -1, (Tk_ErrorProc *) NULL, (ClientData) NULL);
name = XGetAtomName(dispPtr->display, atom);
mustFree = 1;
if (name == NULL) {
name = "?bad atom?";
mustFree = 0;
}
Tk_DeleteErrorHandler(handler);
hPtr = Tcl_CreateHashEntry(&dispPtr->nameTable, (char *) name,
&new);
Tcl_SetHashValue(hPtr, atom);
if (mustFree) {
XFree(name);
}
name = Tcl_GetHashKey(&dispPtr->nameTable, hPtr);
hPtr = Tcl_CreateHashEntry(&dispPtr->atomTable, (char *) atom,
&new);
Tcl_SetHashValue(hPtr, name);
}
return (char *) Tcl_GetHashValue(hPtr);
}
/*
*--------------------------------------------------------------
*
* AtomInit --
*
* Initialize atom-related information for a display.
*
* Results:
* None.
*
* Side effects:
* Tables get initialized, etc. etc..
*
*--------------------------------------------------------------
*/
static void
AtomInit(dispPtr)
register TkDisplay *dispPtr; /* Display to initialize. */
{
dispPtr->atomInit = 1;
Tcl_InitHashTable(&dispPtr->nameTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&dispPtr->atomTable, TCL_ONE_WORD_KEYS);
}
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