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| 54 | #ifdef HAVE_CONFIG_H1 |
| 55 | #include <config.h> |
| 56 | #endif |
| 57 | #include <stdio.h> /* for NULL */ |
| 58 | #include <X11/Xos.h> |
| 59 | #include <X11/Xlib.h> |
| 60 | #include <X11/Xmu/CloseHook.h> |
| 61 | #include <stdlib.h> |
| 62 | |
| 63 | |
| 64 | |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | |
| 70 | typedef struct _CallbackRec { |
| 71 | struct _CallbackRec *next; |
| 72 | XmuCloseHookProc func; |
| 73 | XPointer arg; |
| 74 | } CallbackRec; |
| 75 | |
| 76 | |
| 77 | typedef struct _DisplayEntry { |
| 78 | struct _DisplayEntry *next; |
| 79 | Display *dpy; |
| 80 | int extension; |
| 81 | struct _CallbackRec *start, *end; |
| 82 | struct _CallbackRec *calling; |
| 83 | } DisplayEntry; |
| 84 | |
| 85 | |
| 86 | |
| 87 | |
| 88 | static DisplayEntry *_FindDisplayEntry(Display*, DisplayEntry**); |
| 89 | static Boolint _MakeExtension(Display*, int*); |
| 90 | |
| 91 | static DisplayEntry *elist = NULL((void*)0); |
| 92 | |
| 93 | |
| 94 | |
| 95 | |
| 96 | |
| 97 | |
| 98 | |
| 99 | |
| 100 | |
| 101 | |
| 102 | |
| 103 | |
| 104 | |
| 105 | |
| 106 | |
| 107 | |
| 108 | |
| 109 | |
| 110 | |
| 111 | |
| 112 | |
| 113 | CloseHook |
| 114 | XmuAddCloseDisplayHook(Display *dpy, XmuCloseHookProc func, XPointer arg) |
| 115 | { |
| 116 | DisplayEntry *de; |
| 117 | CallbackRec *cb; |
| 118 | |
| 119 | |
| 120 | cb = (CallbackRec *) malloc (sizeof (CallbackRec)); |
| 121 | if (!cb) return ((XPointer) NULL((void*)0)); |
| 122 | |
| 123 | de = _FindDisplayEntry (dpy, NULL((void*)0)); |
| 124 | if (!de) { |
| 125 | if ((de = (DisplayEntry *) malloc (sizeof (DisplayEntry))) == NULL((void*)0) || |
| 126 | !_MakeExtension (dpy, &de->extension)) { |
| 127 | free ((char *) cb); |
| 128 | if (de) free ((char *) de); |
| 129 | return ((CloseHook) NULL((void*)0)); |
| 130 | } |
| 131 | de->dpy = dpy; |
| 132 | de->start = de->end = NULL((void*)0); |
| 133 | de->calling = NULL((void*)0); |
| 134 | de->next = elist; |
| 135 | elist = de; |
| 136 | } |
| 137 | |
| 138 | |
| 139 | cb->func = func; |
| 140 | cb->arg = arg; |
| 141 | cb->next = NULL((void*)0); |
| 142 | if (de->end) { |
| 143 | de->end->next = cb; |
| 144 | } else { |
| 145 | de->start = cb; |
| 146 | } |
| 147 | de->end = cb; |
| 148 | |
| 149 | return ((CloseHook) cb); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | |
| 154 | |
| 155 | |
| 156 | |
| 157 | Boolint |
| 158 | XmuRemoveCloseDisplayHook(Display *dpy, CloseHook handle, |
| 159 | XmuCloseHookProc func, XPointer arg) |
| 160 | { |
| 161 | DisplayEntry *de = _FindDisplayEntry (dpy, NULL((void*)0)); |
| 162 | register CallbackRec *h, *prev; |
| 163 | |
| 164 | if (!de) return False0; |
| 165 | |
| 166 | |
| 167 | for (h = de->start, prev = NULL((void*)0); h; h = h->next) { |
| 168 | if (handle) { |
| 169 | if (h == (CallbackRec *) handle) break; |
| 170 | } else { |
| 171 | if (h->func == func && h->arg == arg) break; |
| 172 | } |
| 173 | prev = h; |
| 174 | } |
| 175 | if (!h) return False0; |
| 176 | |
| 177 | |
| 178 | |
| 179 | if (de->start == h) { |
| 180 | de->start = h->next; |
| 181 | } else { |
| 182 | prev->next = h->next; |
| 183 | } |
| 184 | if (de->end == h) de->end = prev; |
| 185 | if (de->calling != h) free ((char *) h); |
| 186 | return True1; |
| 187 | } |
| 188 | |
| 189 | |
| 190 | |
| 191 | |
| 192 | |
| 193 | |
| 194 | |
| 195 | Boolint |
| 196 | XmuLookupCloseDisplayHook(Display *dpy, CloseHook handle, |
| 197 | XmuCloseHookProc func, XPointer arg) |
| 198 | { |
| 199 | DisplayEntry *de = _FindDisplayEntry (dpy, NULL((void*)0)); |
| 200 | register CallbackRec *h; |
| 201 | |
| 202 | if (!de) return False0; |
| 203 | |
| 204 | for (h = de->start; h; h = h->next) { |
| 205 | if (handle) { |
| 206 | if (h == (CallbackRec *) handle) break; |
| 207 | } else { |
| 208 | if (h->func == func && h->arg == arg) break; |
| 209 | } |
| 210 | } |
| 211 | return (h ? True1 : False0); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | |
| 216 | |
| 217 | |
| 218 | |
| 219 | |
| 220 | |
| 221 | |
| 222 | |
| 223 | |
| 224 | |
| 225 | |
| 226 | |
| 227 | static DisplayEntry * |
| 228 | _FindDisplayEntry(register Display *dpy, DisplayEntry **prevp) |
| 229 | { |
| 230 | register DisplayEntry *d, *prev; |
| 231 | |
| 232 | for (d = elist, prev = NULL((void*)0); d; d = d->next) { |
| 2 | | Null pointer value stored to 'prev' | |
|
| 3 | | Loop condition is true. Entering loop body | |
|
| 233 | if (d->dpy == dpy) { |
| |
| 234 | if (prevp) *prevp = prev; |
| |
| 6 | | Null pointer value stored to 'prev' | |
|
| 235 | return d; |
| 236 | } |
| 237 | prev = d; |
| 238 | } |
| 239 | return NULL((void*)0); |
| 240 | } |
| 241 | |
| 242 | |
| 243 | |
| 244 | |
| 245 | |
| 246 | |
| 247 | |
| 248 | |
| 249 | static int |
| 250 | _DoCallbacks(Display *dpy, XExtCodes *codes) |
| 251 | { |
| 252 | register CallbackRec *h; |
| 253 | DisplayEntry *prev; |
| 254 | DisplayEntry *de = _FindDisplayEntry (dpy, &prev); |
| 1 | Calling '_FindDisplayEntry' | |
|
| 7 | | Returning from '_FindDisplayEntry' | |
|
| 255 | |
| 256 | if (!de) return 0; |
| |
| 257 | |
| 258 | |
| 259 | for (h = de->start; h;) { |
| 9 | | Loop condition is true. Entering loop body | |
|
| 10 | | Loop condition is false. Execution continues on line 269 | |
|
| 260 | register CallbackRec *nexth = h->next; |
| 261 | de->calling = h; |
| 262 | (*(h->func)) (dpy, h->arg); |
| 263 | de->calling = NULL((void*)0); |
| 264 | free ((char *) h); |
| 265 | h = nexth; |
| 266 | } |
| 267 | |
| 268 | |
| 269 | if (elist == de) { |
| 11 | | Assuming 'elist' is not equal to 'de' | |
|
| |
| 270 | elist = de->next; |
| 271 | } else { |
| 272 | prev->next = de->next; |
| 13 | | Access to field 'next' results in a dereference of a null pointer (loaded from variable 'prev') |
|
| 273 | } |
| 274 | free ((char *) de); |
| 275 | return 1; |
| 276 | } |
| 277 | |
| 278 | |
| 279 | |
| 280 | |
| 281 | |
| 282 | static Boolint |
| 283 | _MakeExtension(Display *dpy, int *extensionp) |
| 284 | { |
| 285 | XExtCodes *codes; |
| 286 | |
| 287 | codes = XAddExtension (dpy); |
| 288 | if (!codes) return False0; |
| 289 | |
| 290 | (void) XESetCloseDisplay (dpy, codes->extension, _DoCallbacks); |
| 291 | |
| 292 | *extensionp = codes->extension; |
| 293 | return True1; |
| 294 | } |