| 1 | /* Copyright Massachusetts Institute of Technology 1985 */ |
| 2 | |
| 3 | #include "copyright.h" |
| 4 | |
| 5 | #include <config.h> |
| 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 | |
| 14 | /* |
| 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 | */ |
| 21 | caddr_t XLookUpAssoc(Display *dpy, |
| 22 | XAssocTable *table, /* XAssocTable to search in. */ |
| 23 | XID x_id) /* XId to search for. */ |
| 24 | { |
| 25 | int hash; |
| 26 | register XAssoc *bucket; |
| 27 | register XAssoc *Entry; |
| 28 | |
| 29 | /* Hash the XId to get the bucket number. */ |
| 30 | hash = x_id & (table->size - 1); |
| 31 | /* Look up the bucket to get the entries in that bucket. */ |
| 32 | bucket = &table->buckets[hash]; |
| 33 | /* Get the first entry in the bucket. */ |
| 34 | Entry = bucket->next; |
| 35 | |
| 36 | /* Scan through the entries in the bucket for the right XId. */ |
| 37 | for (; Entry != bucket; Entry = Entry->next) { |
| 38 | if (Entry->x_id == x_id) { |
| 39 | /* We have the right XId. */ |
| 40 | if (Entry->display == dpy) { |
| 41 | /* We have the right display. */ |
| 42 | /* We have the right entry! */ |
| 43 | return(Entry->data); |
| 44 | } |
| 45 | /* Oops, identical XId's on different displays! */ |
| 46 | continue; |
| 47 | } |
| 48 | if (Entry->x_id > x_id) { |
| 49 | /* We have gone past where it should be. */ |
| 50 | /* It is apparently not in the table. */ |
| 51 | return(NULL); |
| 52 | } |
| 53 | } |
| 54 | /* It is apparently not in the table. */ |
| 55 | return(NULL); |
| 56 | } |