HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| e745ede7 DL |
1 | /* Copyright Massachusetts Institute of Technology 1985 */ |
| 2 | ||
| 0ff3f435 GM |
3 | #include "copyright.h" |
| 4 | ||
| e745ede7 DL |
5 | |
| 6 | #include <X11/Xlib.h> | |
| 7 | #include <X11/Xresource.h> | |
| 8 | #include "X10.h" | |
| 9 | ||
| 10 | #ifndef NULL | |
| 11 | #define NULL 0 | |
| 12 | #endif | |
| 13 | ||
| 177c0ea7 | 14 | /* |
| e745ede7 DL |
15 | * XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId. |
| 16 | * If an appropriately matching XId can be found in the table the routine will | |
| 17 | * return apointer to the data associated with it. If the XId can not be found | |
| 18 | * in the table the routine will return a NULL pointer. All XId's are relative | |
| 19 | * to the currently active Display. | |
| 20 | */ | |
| b782e2d7 DN |
21 | caddr_t XLookUpAssoc(register Display *dpy, register XAssocTable *table, register XID x_id) |
| 22 | ||
| 23 | /* XAssocTable to search in. */ | |
| 24 | /* XId to search for. */ | |
| e745ede7 DL |
25 | { |
| 26 | int hash; | |
| 27 | register XAssoc *bucket; | |
| 28 | register XAssoc *Entry; | |
| 29 | ||
| 30 | /* Hash the XId to get the bucket number. */ | |
| 31 | hash = x_id & (table->size - 1); | |
| 32 | /* Look up the bucket to get the entries in that bucket. */ | |
| 33 | bucket = &table->buckets[hash]; | |
| 34 | /* Get the first entry in the bucket. */ | |
| 35 | Entry = bucket->next; | |
| 36 | ||
| 37 | /* Scan through the entries in the bucket for the right XId. */ | |
| 38 | for (; Entry != bucket; Entry = Entry->next) { | |
| 39 | if (Entry->x_id == x_id) { | |
| 40 | /* We have the right XId. */ | |
| 41 | if (Entry->display == dpy) { | |
| 42 | /* We have the right display. */ | |
| 43 | /* We have the right entry! */ | |
| 44 | return(Entry->data); | |
| 45 | } | |
| 46 | /* Oops, identical XId's on different displays! */ | |
| 47 | continue; | |
| 48 | } | |
| 49 | if (Entry->x_id > x_id) { | |
| 50 | /* We have gone past where it should be. */ | |
| 51 | /* It is apparently not in the table. */ | |
| 52 | return(NULL); | |
| 53 | } | |
| 54 | } | |
| 55 | /* It is apparently not in the table. */ | |
| 56 | return(NULL); | |
| 57 | } | |
| 58 |