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| 29 | #ifdef HAVE_CONFIG_H1 |
| 30 | #include <config.h> |
| 31 | #endif |
| 32 | #include "IntrinsicI.h" |
| 33 | #include "CreateI.h" |
| 34 | |
| 35 | static void FreeBlockHookList( |
| 36 | Widget widget, |
| 37 | XtPointer closure, |
| 38 | XtPointer call_data) |
| 39 | { |
| 40 | BlockHook list = *(BlockHook*)closure; |
| 41 | while (list != NULL((void*)0)) { |
| 42 | BlockHook next = list->next; |
| 43 | XtFree( (XtPointer)list ); |
| 44 | list = next; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | |
| 49 | XtBlockHookId XtAppAddBlockHook( |
| 50 | XtAppContext app, |
| 51 | XtBlockHookProc proc, |
| 52 | XtPointer closure) |
| 53 | { |
| 54 | BlockHook hook = XtNew(BlockHookRec)((BlockHookRec *) XtMalloc((unsigned) sizeof(BlockHookRec))); |
| 55 | LOCK_APP(app)if(app && app->lock)(*app->lock)(app); |
| 1 | Within the expansion of the macro 'LOCK_APP':
| |
a | Assuming pointer value is null |
|
| 56 | hook->next = app->block_hook_list; |
| 2 | | Access to field 'block_hook_list' results in a dereference of a null pointer (loaded from variable 'app') |
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| 57 | hook->app = app; |
| 58 | hook->proc = proc; |
| 59 | hook->closure = closure; |
| 60 | if (app->block_hook_list == NULL((void*)0)) { |
| 61 | _XtAddCallback( &app->destroy_callbacks, |
| 62 | FreeBlockHookList, |
| 63 | (XtPointer)&app->block_hook_list |
| 64 | ); |
| 65 | } |
| 66 | app->block_hook_list = hook; |
| 67 | UNLOCK_APP(app)if(app && app->unlock)(*app->unlock)(app); |
| 68 | return (XtBlockHookId)hook; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | void XtRemoveBlockHook( |
| 73 | XtBlockHookId id) |
| 74 | { |
| 75 | BlockHook *p, hook = (BlockHook)id; |
| 76 | XtAppContext app = hook->app; |
| 77 | LOCK_APP(app)if(app && app->lock)(*app->lock)(app); |
| 78 | for (p = &app->block_hook_list; p != NULL((void*)0) && *p != hook; p = &(*p)->next); |
| 79 | if (p == NULL((void*)0)) { |
| 80 | #ifdef DEBUG |
| 81 | XtAppWarningMsg(app, "badId", "xtRemoveBlockHook", XtCXtToolkitError, |
| 82 | "XtRemoveBlockHook called with bad or old hook id", |
| 83 | (String*)NULL((void*)0), (Cardinal*)NULL((void*)0)); |
| 84 | #endif /*DEBUG*/ |
| 85 | UNLOCK_APP(app)if(app && app->unlock)(*app->unlock)(app); |
| 86 | return; |
| 87 | } |
| 88 | *p = hook->next; |
| 89 | XtFree( (XtPointer)hook ); |
| 90 | UNLOCK_APP(app)if(app && app->unlock)(*app->unlock)(app); |
| 91 | } |
| 92 | |
| 93 | static void DeleteShellFromHookObj( |
| 94 | Widget shell, |
| 95 | XtPointer closure, |
| 96 | XtPointer call_data) |
| 97 | { |
| 98 | |
| 99 | Cardinal ii, jj; |
| 100 | HookObject ho = (HookObject) closure; |
| 101 | |
| 102 | for (ii = 0; ii < ho->hooks.num_shells; ii++) |
| 103 | if (ho->hooks.shells[ii] == shell) { |
| 104 | |
| 105 | for (jj = ii; jj < ho->hooks.num_shells; jj++) { |
| 106 | if ((jj+1) < ho->hooks.num_shells) |
| 107 | ho->hooks.shells[jj] = ho->hooks.shells[jj+1]; |
| 108 | } |
| 109 | break; |
| 110 | } |
| 111 | ho->hooks.num_shells--; |
| 112 | } |
| 113 | |
| 114 | #define SHELL_INCR4 4 |
| 115 | |
| 116 | void _XtAddShellToHookObj( |
| 117 | Widget shell) |
| 118 | { |
| 119 | |
| 120 | HookObject ho = (HookObject) XtHooksOfDisplay(XtDisplay(shell)(((shell)->core.screen)->display)); |
| 121 | |
| 122 | if (ho->hooks.num_shells == ho->hooks.max_shells) { |
| 123 | ho->hooks.max_shells += SHELL_INCR4; |
| 124 | ho->hooks.shells = |
| 125 | (WidgetList)XtRealloc((char*)ho->hooks.shells, |
| 126 | ho->hooks.max_shells * sizeof (Widget)); |
| 127 | } |
| 128 | ho->hooks.shells[ho->hooks.num_shells++] = shell; |
| 129 | |
| 130 | XtAddCallback(shell, XtNdestroyCallback((char*)&XtStrings[169]), DeleteShellFromHookObj, |
| 131 | (XtPointer)ho); |
| 132 | } |
| 133 | |
| 134 | Boolean _XtIsHookObject( |
| 135 | Widget widget) |
| 136 | { |
| 137 | return (widget->core.widget_class == hookObjectClass); |
| 138 | } |
| 139 | |
| 140 | Widget XtHooksOfDisplay( |
| 141 | Display* dpy) |
| 142 | { |
| 143 | Widget retval; |
| 144 | XtPerDisplay pd; |
| 145 | DPY_TO_APPCON(dpy)XtAppContext app = (_XtProcessLock ? XtDisplayToApplicationContext (dpy): ((void*)0)); |
| 146 | |
| 147 | LOCK_APP(app)if(app && app->lock)(*app->lock)(app); |
| 148 | pd = _XtGetPerDisplay(dpy); |
| 149 | if (pd->hook_object == NULL((void*)0)) |
| 150 | pd->hook_object = |
| 151 | _XtCreateHookObj((Screen*)DefaultScreenOfDisplay(dpy)(&((_XPrivDisplay)(dpy))->screens[(((_XPrivDisplay)(dpy ))->default_screen)])); |
| 152 | retval = pd->hook_object; |
| 153 | UNLOCK_APP(app)if(app && app->unlock)(*app->unlock)(app); |
| 154 | return retval; |
| 155 | } |