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+/* $XFree86: xc/programs/Xserver/dix/dixutils.c,v 3.13 2003/01/12 02:44:26 dawes Exp $ */
+/***********************************************************
+
+Copyright 1987, 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.
+
+
+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.
+
+******************************************************************/
+
+/*
+
+(c)Copyright 1988,1991 Adobe Systems Incorporated. All rights reserved.
+
+Permission to use, copy, modify, distribute, and sublicense this software and its
+documentation for any purpose and without fee is hereby granted, provided that
+the above copyright notices appear in all copies and that both those copyright
+notices and this permission notice appear in supporting documentation and that
+the name of Adobe Systems Incorporated not be used in advertising or publicity
+pertaining to distribution of the software without specific, written prior
+permission. No trademark license to use the Adobe trademarks is hereby
+granted. If the Adobe trademark "Display PostScript"(tm) is used to describe
+this software, its functionality or for any other purpose, such use shall be
+limited to a statement that this software works in conjunction with the Display
+PostScript system. Proper trademark attribution to reflect Adobe's ownership
+of the trademark shall be given whenever any such reference to the Display
+PostScript system is made.
+
+ADOBE MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF THE SOFTWARE FOR ANY
+PURPOSE. IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ADOBE
+DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-
+INFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL ADOBE BE LIABLE TO YOU
+OR ANY OTHER PARTY FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+DAMAGES WHATSOEVER WHETHER IN AN ACTION OF CONTRACT,NEGLIGENCE, STRICT
+LIABILITY OR ANY OTHER ACTION ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE. ADOBE WILL NOT PROVIDE ANY TRAINING OR OTHER
+SUPPORT FOR THE SOFTWARE.
+
+Adobe, PostScript, and Display PostScript are trademarks of Adobe Systems
+Incorporated which may be registered in certain jurisdictions.
+
+Author: Adobe Systems Incorporated
+
+*/
+
+/* $Xorg: dixutils.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include <X11/Xmd.h>
+#include "misc.h"
+#include "windowstr.h"
+#include "dixstruct.h"
+#include "pixmapstr.h"
+#include "scrnintstr.h"
+#define XK_LATIN1
+#include <X11/keysymdef.h>
+#ifdef XCSECURITY
+#define _SECURITY_SERVER
+#include <X11/extensions/security.h>
+#endif
+
+/*
+ * CompareTimeStamps returns -1, 0, or +1 depending on if the first
+ * argument is less than, equal to or greater than the second argument.
+ */
+
+int
+CompareTimeStamps(TimeStamp a, TimeStamp b)
+{
+ if (a.months < b.months)
+ return EARLIER;
+ if (a.months > b.months)
+ return LATER;
+ if (a.milliseconds < b.milliseconds)
+ return EARLIER;
+ if (a.milliseconds > b.milliseconds)
+ return LATER;
+ return SAMETIME;
+}
+
+/*
+ * convert client times to server TimeStamps
+ */
+
+#define HALFMONTH ((unsigned long) 1<<31)
+TimeStamp
+ClientTimeToServerTime(CARD32 c)
+{
+ TimeStamp ts;
+ if (c == CurrentTime)
+ return currentTime;
+ ts.months = currentTime.months;
+ ts.milliseconds = c;
+ if (c > currentTime.milliseconds)
+ {
+ if (((unsigned long) c - currentTime.milliseconds) > HALFMONTH)
+ ts.months -= 1;
+ }
+ else if (c < currentTime.milliseconds)
+ {
+ if (((unsigned long)currentTime.milliseconds - c) > HALFMONTH)
+ ts.months += 1;
+ }
+ return ts;
+}
+
+/*
+ * ISO Latin-1 case conversion routine
+ *
+ * this routine always null-terminates the result, so
+ * beware of too-small buffers
+ */
+
+static unsigned char
+ISOLatin1ToLower (unsigned char source)
+{
+ unsigned char dest;
+ if ((source >= XK_A) && (source <= XK_Z))
+ dest = source + (XK_a - XK_A);
+ else if ((source >= XK_Agrave) && (source <= XK_Odiaeresis))
+ dest = source + (XK_agrave - XK_Agrave);
+ else if ((source >= XK_Ooblique) && (source <= XK_Thorn))
+ dest = source + (XK_oslash - XK_Ooblique);
+ else
+ dest = source;
+ return dest;
+}
+
+
+void
+CopyISOLatin1Lowered(unsigned char *dest, unsigned char *source, int length)
+{
+ register int i;
+
+ for (i = 0; i < length; i++, source++, dest++)
+ *dest = ISOLatin1ToLower (*source);
+ *dest = '\0';
+}
+
+int
+CompareISOLatin1Lowered(unsigned char *s1, int s1len,
+ unsigned char *s2, int s2len)
+{
+ unsigned char c1, c2;
+
+ for (;;)
+ {
+ /* note -- compare against zero so that -1 ignores len */
+ c1 = s1len-- ? *s1++ : '\0';
+ c2 = s2len-- ? *s2++ : '\0';
+ if (!c1 ||
+ (c1 != c2 &&
+ (c1 = ISOLatin1ToLower (c1)) != (c2 = ISOLatin1ToLower (c2))))
+ break;
+ }
+ return (int) c1 - (int) c2;
+}
+
+#ifdef XCSECURITY
+
+/* SecurityLookupWindow and SecurityLookupDrawable:
+ * Look up the window/drawable taking into account the client doing
+ * the lookup and the type of access desired. Return the window/drawable
+ * if it exists and the client is allowed access, else return NULL.
+ * Most Proc* functions should be calling these instead of
+ * LookupWindow and LookupDrawable, which do no access checks.
+ */
+
+WindowPtr
+SecurityLookupWindow(XID rid, ClientPtr client, Mask access_mode)
+{
+ WindowPtr pWin;
+
+ client->errorValue = rid;
+ if(rid == INVALID)
+ return NULL;
+ if (client->trustLevel != XSecurityClientTrusted)
+ return (WindowPtr)SecurityLookupIDByType(client, rid, RT_WINDOW, access_mode);
+ if (client->lastDrawableID == rid)
+ {
+ if (client->lastDrawable->type == DRAWABLE_WINDOW)
+ return ((WindowPtr) client->lastDrawable);
+ return (WindowPtr) NULL;
+ }
+ pWin = (WindowPtr)SecurityLookupIDByType(client, rid, RT_WINDOW, access_mode);
+ if (pWin && pWin->drawable.type == DRAWABLE_WINDOW) {
+ client->lastDrawable = (DrawablePtr) pWin;
+ client->lastDrawableID = rid;
+ client->lastGCID = INVALID;
+ client->lastGC = (GCPtr)NULL;
+ }
+ return pWin;
+}
+
+
+pointer
+SecurityLookupDrawable(XID rid, ClientPtr client, Mask access_mode)
+{
+ register DrawablePtr pDraw;
+
+ if(rid == INVALID)
+ return (pointer) NULL;
+ if (client->trustLevel != XSecurityClientTrusted)
+ return (DrawablePtr)SecurityLookupIDByClass(client, rid, RC_DRAWABLE,
+ access_mode);
+ if (client->lastDrawableID == rid)
+ return ((pointer) client->lastDrawable);
+ pDraw = (DrawablePtr)SecurityLookupIDByClass(client, rid, RC_DRAWABLE,
+ access_mode);
+ if (pDraw && (pDraw->type != UNDRAWABLE_WINDOW))
+ return (pointer)pDraw;
+ return (pointer)NULL;
+}
+
+/* We can't replace the LookupWindow and LookupDrawable functions with
+ * macros because of compatibility with loadable servers.
+ */
+
+WindowPtr
+LookupWindow(XID rid, ClientPtr client)
+{
+ return SecurityLookupWindow(rid, client, SecurityUnknownAccess);
+}
+
+pointer
+LookupDrawable(XID rid, ClientPtr client)
+{
+ return SecurityLookupDrawable(rid, client, SecurityUnknownAccess);
+}
+
+#else /* not XCSECURITY */
+
+WindowPtr
+LookupWindow(XID rid, ClientPtr client)
+{
+ WindowPtr pWin;
+
+ client->errorValue = rid;
+ if(rid == INVALID)
+ return NULL;
+ if (client->lastDrawableID == rid)
+ {
+ if (client->lastDrawable->type == DRAWABLE_WINDOW)
+ return ((WindowPtr) client->lastDrawable);
+ return (WindowPtr) NULL;
+ }
+ pWin = (WindowPtr)LookupIDByType(rid, RT_WINDOW);
+ if (pWin && pWin->drawable.type == DRAWABLE_WINDOW) {
+ client->lastDrawable = (DrawablePtr) pWin;
+ client->lastDrawableID = rid;
+ client->lastGCID = INVALID;
+ client->lastGC = (GCPtr)NULL;
+ }
+ return pWin;
+}
+
+
+pointer
+LookupDrawable(XID rid, ClientPtr client)
+{
+ register DrawablePtr pDraw;
+
+ if(rid == INVALID)
+ return (pointer) NULL;
+ if (client->lastDrawableID == rid)
+ return ((pointer) client->lastDrawable);
+ pDraw = (DrawablePtr)LookupIDByClass(rid, RC_DRAWABLE);
+ if (pDraw && (pDraw->type != UNDRAWABLE_WINDOW))
+ return (pointer)pDraw;
+ return (pointer)NULL;
+}
+
+#endif /* XCSECURITY */
+
+ClientPtr
+LookupClient(XID rid, ClientPtr client)
+{
+ pointer pRes = (pointer)SecurityLookupIDByClass(client, rid, RC_ANY,
+ SecurityReadAccess);
+ int clientIndex = CLIENT_ID(rid);
+
+ if (clientIndex && pRes && clients[clientIndex] && !(rid & SERVER_BIT))
+ {
+ return clients[clientIndex];
+ }
+ return (ClientPtr)NULL;
+}
+
+
+int
+AlterSaveSetForClient(ClientPtr client, WindowPtr pWin, unsigned mode,
+ Bool toRoot, Bool remap)
+{
+ int numnow;
+ SaveSetElt *pTmp = NULL;
+ int j;
+
+ numnow = client->numSaved;
+ j = 0;
+ if (numnow)
+ {
+ pTmp = client->saveSet;
+ while ((j < numnow) && (SaveSetWindow(pTmp[j]) != (pointer)pWin))
+ j++;
+ }
+ if (mode == SetModeInsert)
+ {
+ if (j < numnow) /* duplicate */
+ return(Success);
+ numnow++;
+ pTmp = (SaveSetElt *)xrealloc(client->saveSet, sizeof(*pTmp) * numnow);
+ if (!pTmp)
+ return(BadAlloc);
+ client->saveSet = pTmp;
+ client->numSaved = numnow;
+ SaveSetAssignWindow(client->saveSet[numnow - 1], pWin);
+ SaveSetAssignToRoot(client->saveSet[numnow - 1], toRoot);
+ SaveSetAssignRemap(client->saveSet[numnow - 1], remap);
+ return(Success);
+ }
+ else if ((mode == SetModeDelete) && (j < numnow))
+ {
+ while (j < numnow-1)
+ {
+ pTmp[j] = pTmp[j+1];
+ j++;
+ }
+ numnow--;
+ if (numnow)
+ {
+ pTmp = (SaveSetElt *)xrealloc(client->saveSet, sizeof(*pTmp) * numnow);
+ if (pTmp)
+ client->saveSet = pTmp;
+ }
+ else
+ {
+ xfree(client->saveSet);
+ client->saveSet = (SaveSetElt *)NULL;
+ }
+ client->numSaved = numnow;
+ return(Success);
+ }
+ return(Success);
+}
+
+void
+DeleteWindowFromAnySaveSet(WindowPtr pWin)
+{
+ register int i;
+ register ClientPtr client;
+
+ for (i = 0; i< currentMaxClients; i++)
+ {
+ client = clients[i];
+ if (client && client->numSaved)
+ (void)AlterSaveSetForClient(client, pWin, SetModeDelete, FALSE, TRUE);
+ }
+}
+
+/* No-op Don't Do Anything : sometimes we need to be able to call a procedure
+ * that doesn't do anything. For example, on screen with only static
+ * colormaps, if someone calls install colormap, it's easier to have a dummy
+ * procedure to call than to check if there's a procedure
+ */
+void
+NoopDDA(void)
+{
+}
+
+typedef struct _BlockHandler {
+ BlockHandlerProcPtr BlockHandler;
+ WakeupHandlerProcPtr WakeupHandler;
+ pointer blockData;
+ Bool deleted;
+} BlockHandlerRec, *BlockHandlerPtr;
+
+static BlockHandlerPtr handlers;
+static int numHandlers;
+static int sizeHandlers;
+static Bool inHandler;
+static Bool handlerDeleted;
+
+/**
+ *
+ * \param pTimeout DIX doesn't want to know how OS represents time
+ * \param pReadMask nor how it represents the det of descriptors
+ */
+void
+BlockHandler(pointer pTimeout, pointer pReadmask)
+{
+ register int i, j;
+
+ ++inHandler;
+ for (i = 0; i < screenInfo.numScreens; i++)
+ (* screenInfo.screens[i]->BlockHandler)(i,
+ screenInfo.screens[i]->blockData,
+ pTimeout, pReadmask);
+ for (i = 0; i < numHandlers; i++)
+ (*handlers[i].BlockHandler) (handlers[i].blockData,
+ pTimeout, pReadmask);
+ if (handlerDeleted)
+ {
+ for (i = 0; i < numHandlers;)
+ if (handlers[i].deleted)
+ {
+ for (j = i; j < numHandlers - 1; j++)
+ handlers[j] = handlers[j+1];
+ numHandlers--;
+ }
+ else
+ i++;
+ handlerDeleted = FALSE;
+ }
+ --inHandler;
+}
+
+/**
+ *
+ * \param result 32 bits of undefined result from the wait
+ * \param pReadmask the resulting descriptor mask
+ */
+void
+WakeupHandler(int result, pointer pReadmask)
+{
+ register int i, j;
+
+ ++inHandler;
+ for (i = numHandlers - 1; i >= 0; i--)
+ (*handlers[i].WakeupHandler) (handlers[i].blockData,
+ result, pReadmask);
+ for (i = 0; i < screenInfo.numScreens; i++)
+ (* screenInfo.screens[i]->WakeupHandler)(i,
+ screenInfo.screens[i]->wakeupData,
+ result, pReadmask);
+ if (handlerDeleted)
+ {
+ for (i = 0; i < numHandlers;)
+ if (handlers[i].deleted)
+ {
+ for (j = i; j < numHandlers - 1; j++)
+ handlers[j] = handlers[j+1];
+ numHandlers--;
+ }
+ else
+ i++;
+ handlerDeleted = FALSE;
+ }
+ --inHandler;
+}
+
+/**
+ * Reentrant with BlockHandler and WakeupHandler, except wakeup won't
+ * get called until next time
+ */
+Bool
+RegisterBlockAndWakeupHandlers (BlockHandlerProcPtr blockHandler,
+ WakeupHandlerProcPtr wakeupHandler,
+ pointer blockData)
+{
+ BlockHandlerPtr new;
+
+ if (numHandlers >= sizeHandlers)
+ {
+ new = (BlockHandlerPtr) xrealloc (handlers, (numHandlers + 1) *
+ sizeof (BlockHandlerRec));
+ if (!new)
+ return FALSE;
+ handlers = new;
+ sizeHandlers = numHandlers + 1;
+ }
+ handlers[numHandlers].BlockHandler = blockHandler;
+ handlers[numHandlers].WakeupHandler = wakeupHandler;
+ handlers[numHandlers].blockData = blockData;
+ handlers[numHandlers].deleted = FALSE;
+ numHandlers = numHandlers + 1;
+ return TRUE;
+}
+
+void
+RemoveBlockAndWakeupHandlers (BlockHandlerProcPtr blockHandler,
+ WakeupHandlerProcPtr wakeupHandler,
+ pointer blockData)
+{
+ int i;
+
+ for (i = 0; i < numHandlers; i++)
+ if (handlers[i].BlockHandler == blockHandler &&
+ handlers[i].WakeupHandler == wakeupHandler &&
+ handlers[i].blockData == blockData)
+ {
+ if (inHandler)
+ {
+ handlerDeleted = TRUE;
+ handlers[i].deleted = TRUE;
+ }
+ else
+ {
+ for (; i < numHandlers - 1; i++)
+ handlers[i] = handlers[i+1];
+ numHandlers--;
+ }
+ break;
+ }
+}
+
+void
+InitBlockAndWakeupHandlers ()
+{
+ xfree (handlers);
+ handlers = (BlockHandlerPtr) 0;
+ numHandlers = 0;
+ sizeHandlers = 0;
+}
+
+/*
+ * A general work queue. Perform some task before the server
+ * sleeps for input.
+ */
+
+WorkQueuePtr workQueue;
+static WorkQueuePtr *workQueueLast = &workQueue;
+
+void
+ProcessWorkQueue(void)
+{
+ WorkQueuePtr q, *p;
+
+ p = &workQueue;
+ /*
+ * Scan the work queue once, calling each function. Those
+ * which return TRUE are removed from the queue, otherwise
+ * they will be called again. This must be reentrant with
+ * QueueWorkProc.
+ */
+ while ((q = *p))
+ {
+ if ((*q->function) (q->client, q->closure))
+ {
+ /* remove q from the list */
+ *p = q->next; /* don't fetch until after func called */
+ xfree (q);
+ }
+ else
+ {
+ p = &q->next; /* don't fetch until after func called */
+ }
+ }
+ workQueueLast = p;
+}
+
+void
+ProcessWorkQueueZombies(void)
+{
+ WorkQueuePtr q, *p;
+
+ p = &workQueue;
+ while ((q = *p))
+ {
+ if (q->client && q->client->clientGone)
+ {
+ (void) (*q->function) (q->client, q->closure);
+ /* remove q from the list */
+ *p = q->next; /* don't fetch until after func called */
+ xfree (q);
+ }
+ else
+ {
+ p = &q->next; /* don't fetch until after func called */
+ }
+ }
+ workQueueLast = p;
+}
+
+Bool
+QueueWorkProc (
+ Bool (*function)(ClientPtr /* pClient */, pointer /* closure */),
+ ClientPtr client, pointer closure)
+{
+ WorkQueuePtr q;
+
+ q = (WorkQueuePtr) xalloc (sizeof *q);
+ if (!q)
+ return FALSE;
+ q->function = function;
+ q->client = client;
+ q->closure = closure;
+ q->next = NULL;
+ *workQueueLast = q;
+ workQueueLast = &q->next;
+ return TRUE;
+}
+
+/*
+ * Manage a queue of sleeping clients, awakening them
+ * when requested, by using the OS functions IgnoreClient
+ * and AttendClient. Note that this *ignores* the troubles
+ * with request data interleaving itself with events, but
+ * we'll leave that until a later time.
+ */
+
+typedef struct _SleepQueue {
+ struct _SleepQueue *next;
+ ClientPtr client;
+ ClientSleepProcPtr function;
+ pointer closure;
+} SleepQueueRec, *SleepQueuePtr;
+
+static SleepQueuePtr sleepQueue = NULL;
+
+Bool
+ClientSleep (ClientPtr client, ClientSleepProcPtr function, pointer closure)
+{
+ SleepQueuePtr q;
+
+ q = (SleepQueuePtr) xalloc (sizeof *q);
+ if (!q)
+ return FALSE;
+
+ IgnoreClient (client);
+ q->next = sleepQueue;
+ q->client = client;
+ q->function = function;
+ q->closure = closure;
+ sleepQueue = q;
+ return TRUE;
+}
+
+Bool
+ClientSignal (ClientPtr client)
+{
+ SleepQueuePtr q;
+
+ for (q = sleepQueue; q; q = q->next)
+ if (q->client == client)
+ {
+ return QueueWorkProc (q->function, q->client, q->closure);
+ }
+ return FALSE;
+}
+
+void
+ClientWakeup (ClientPtr client)
+{
+ SleepQueuePtr q, *prev;
+
+ prev = &sleepQueue;
+ while ( (q = *prev) )
+ {
+ if (q->client == client)
+ {
+ *prev = q->next;
+ xfree (q);
+ if (client->clientGone)
+ /* Oops -- new zombie cleanup code ensures this only
+ * happens from inside CloseDownClient; don't want to
+ * recurse here...
+ */
+ /* CloseDownClient(client) */;
+ else
+ AttendClient (client);
+ break;
+ }
+ prev = &q->next;
+ }
+}
+
+Bool
+ClientIsAsleep (ClientPtr client)
+{
+ SleepQueuePtr q;
+
+ for (q = sleepQueue; q; q = q->next)
+ if (q->client == client)
+ return TRUE;
+ return FALSE;
+}
+
+/*
+ * Generic Callback Manager
+ */
+
+/* ===== Private Procedures ===== */
+
+static int numCallbackListsToCleanup = 0;
+static CallbackListPtr **listsToCleanup = NULL;
+
+static Bool
+_AddCallback(
+ CallbackListPtr *pcbl,
+ CallbackProcPtr callback,
+ pointer data)
+{
+ CallbackPtr cbr;
+
+ cbr = (CallbackPtr) xalloc(sizeof(CallbackRec));
+ if (!cbr)
+ return FALSE;
+ cbr->proc = callback;
+ cbr->data = data;
+ cbr->next = (*pcbl)->list;
+ cbr->deleted = FALSE;
+ (*pcbl)->list = cbr;
+ return TRUE;
+}
+
+static Bool
+_DeleteCallback(
+ CallbackListPtr *pcbl,
+ CallbackProcPtr callback,
+ pointer data)
+{
+ CallbackListPtr cbl = *pcbl;
+ CallbackPtr cbr, pcbr;
+
+ for (pcbr = NULL, cbr = cbl->list;
+ cbr != NULL;
+ pcbr = cbr, cbr = cbr->next)
+ {
+ if ((cbr->proc == callback) && (cbr->data == data))
+ break;
+ }
+ if (cbr != NULL)
+ {
+ if (cbl->inCallback)
+ {
+ ++(cbl->numDeleted);
+ cbr->deleted = TRUE;
+ }
+ else
+ {
+ if (pcbr == NULL)
+ cbl->list = cbr->next;
+ else
+ pcbr->next = cbr->next;
+ xfree(cbr);
+ }
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static void
+_CallCallbacks(
+ CallbackListPtr *pcbl,
+ pointer call_data)
+{
+ CallbackListPtr cbl = *pcbl;
+ CallbackPtr cbr, pcbr;
+
+ ++(cbl->inCallback);
+ for (cbr = cbl->list; cbr != NULL; cbr = cbr->next)
+ {
+ (*(cbr->proc)) (pcbl, cbr->data, call_data);
+ }
+ --(cbl->inCallback);
+
+ if (cbl->inCallback) return;
+
+ /* Was the entire list marked for deletion? */
+
+ if (cbl->deleted)
+ {
+ DeleteCallbackList(pcbl);
+ return;
+ }
+
+ /* Were some individual callbacks on the list marked for deletion?
+ * If so, do the deletions.
+ */
+
+ if (cbl->numDeleted)
+ {
+ for (pcbr = NULL, cbr = cbl->list; (cbr != NULL) && cbl->numDeleted; )
+ {
+ if (cbr->deleted)
+ {
+ if (pcbr)
+ {
+ cbr = cbr->next;
+ xfree(pcbr->next);
+ pcbr->next = cbr;
+ } else
+ {
+ cbr = cbr->next;
+ xfree(cbl->list);
+ cbl->list = cbr;
+ }
+ cbl->numDeleted--;
+ }
+ else /* this one wasn't deleted */
+ {
+ pcbr = cbr;
+ cbr = cbr->next;
+ }
+ }
+ }
+}
+
+static void
+_DeleteCallbackList(
+ CallbackListPtr *pcbl)
+{
+ CallbackListPtr cbl = *pcbl;
+ CallbackPtr cbr, nextcbr;
+ int i;
+
+ if (cbl->inCallback)
+ {
+ cbl->deleted = TRUE;
+ return;
+ }
+
+ for (i = 0; i < numCallbackListsToCleanup; i++)
+ {
+ if ((listsToCleanup[i] = pcbl) != 0)
+ {
+ listsToCleanup[i] = NULL;
+ break;
+ }
+ }
+
+ for (cbr = cbl->list; cbr != NULL; cbr = nextcbr)
+ {
+ nextcbr = cbr->next;
+ xfree(cbr);
+ }
+ xfree(cbl);
+ *pcbl = NULL;
+}
+
+static CallbackFuncsRec default_cbfuncs =
+{
+ _AddCallback,
+ _DeleteCallback,
+ _CallCallbacks,
+ _DeleteCallbackList
+};
+
+/* ===== Public Procedures ===== */
+
+Bool
+CreateCallbackList(CallbackListPtr *pcbl, CallbackFuncsPtr cbfuncs)
+{
+ CallbackListPtr cbl;
+ int i;
+
+ if (!pcbl) return FALSE;
+ cbl = (CallbackListPtr) xalloc(sizeof(CallbackListRec));
+ if (!cbl) return FALSE;
+ cbl->funcs = cbfuncs ? *cbfuncs : default_cbfuncs;
+ cbl->inCallback = 0;
+ cbl->deleted = FALSE;
+ cbl->numDeleted = 0;
+ cbl->list = NULL;
+ *pcbl = cbl;
+
+ for (i = 0; i < numCallbackListsToCleanup; i++)
+ {
+ if (!listsToCleanup[i])
+ {
+ listsToCleanup[i] = pcbl;
+ return TRUE;
+ }
+ }
+
+ listsToCleanup = (CallbackListPtr **)xnfrealloc(listsToCleanup,
+ sizeof(CallbackListPtr *) * (numCallbackListsToCleanup+1));
+ listsToCleanup[numCallbackListsToCleanup] = pcbl;
+ numCallbackListsToCleanup++;
+ return TRUE;
+}
+
+Bool
+AddCallback(CallbackListPtr *pcbl, CallbackProcPtr callback, pointer data)
+{
+ if (!pcbl) return FALSE;
+ if (!*pcbl)
+ { /* list hasn't been created yet; go create it */
+ if (!CreateCallbackList(pcbl, (CallbackFuncsPtr)NULL))
+ return FALSE;
+ }
+ return ((*(*pcbl)->funcs.AddCallback) (pcbl, callback, data));
+}
+
+Bool
+DeleteCallback(CallbackListPtr *pcbl, CallbackProcPtr callback, pointer data)
+{
+ if (!pcbl || !*pcbl) return FALSE;
+ return ((*(*pcbl)->funcs.DeleteCallback) (pcbl, callback, data));
+}
+
+void
+CallCallbacks(CallbackListPtr *pcbl, pointer call_data)
+{
+ if (!pcbl || !*pcbl) return;
+ (*(*pcbl)->funcs.CallCallbacks) (pcbl, call_data);
+}
+
+void
+DeleteCallbackList(CallbackListPtr *pcbl)
+{
+ if (!pcbl || !*pcbl) return;
+ (*(*pcbl)->funcs.DeleteCallbackList) (pcbl);
+}
+
+void
+InitCallbackManager()
+{
+ int i;
+
+ for (i = 0; i < numCallbackListsToCleanup; i++)
+ {
+ DeleteCallbackList(listsToCleanup[i]);
+ }
+ if (listsToCleanup) xfree(listsToCleanup);
+
+ numCallbackListsToCleanup = 0;
+ listsToCleanup = NULL;
+}