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Diffstat (limited to 'nx-X11/programs/Xserver/dix/dixutils.c')
| -rw-r--r-- | nx-X11/programs/Xserver/dix/dixutils.c | 962 |
1 files changed, 962 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/dix/dixutils.c b/nx-X11/programs/Xserver/dix/dixutils.c new file mode 100644 index 000000000..e7d4ccd4d --- /dev/null +++ b/nx-X11/programs/Xserver/dix/dixutils.c @@ -0,0 +1,962 @@ +/* $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; +} |