HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| e745ede7 DL |
1 | /* $XConsortium: XLookAssoc.c,v 10.16 91/01/06 12:09:24 rws Exp $ */ |
| 2 | /* Copyright Massachusetts Institute of Technology 1985 */ | |
| 3 | ||
| 4 | /* | |
| 5 | Permission to use, copy, modify, distribute, and sell this software and its | |
| 6 | documentation for any purpose is hereby granted without fee, provided that | |
| 7 | the above copyright notice appear in all copies and that both that | |
| 8 | copyright notice and this permission notice appear in supporting | |
| 9 | documentation, and that the name of M.I.T. not be used in advertising or | |
| 10 | publicity pertaining to distribution of the software without specific, | |
| 11 | written prior permission. M.I.T. makes no representations about the | |
| 12 | suitability of this software for any purpose. It is provided "as is" | |
| 13 | without express or implied warranty. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <X11/Xlib.h> | |
| 17 | #include <X11/Xresource.h> | |
| 18 | #include "X10.h" | |
| 19 | ||
| 20 | #ifndef NULL | |
| 21 | #define NULL 0 | |
| 22 | #endif | |
| 23 | ||
| 177c0ea7 | 24 | /* |
| e745ede7 DL |
25 | * XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId. |
| 26 | * If an appropriately matching XId can be found in the table the routine will | |
| 27 | * return apointer to the data associated with it. If the XId can not be found | |
| 28 | * in the table the routine will return a NULL pointer. All XId's are relative | |
| 29 | * to the currently active Display. | |
| 30 | */ | |
| 31 | caddr_t XLookUpAssoc(dpy, table, x_id) | |
| 32 | register Display *dpy; | |
| 33 | register XAssocTable *table; /* XAssocTable to search in. */ | |
| 34 | register XID x_id; /* XId to search for. */ | |
| 35 | { | |
| 36 | int hash; | |
| 37 | register XAssoc *bucket; | |
| 38 | register XAssoc *Entry; | |
| 39 | ||
| 40 | /* Hash the XId to get the bucket number. */ | |
| 41 | hash = x_id & (table->size - 1); | |
| 42 | /* Look up the bucket to get the entries in that bucket. */ | |
| 43 | bucket = &table->buckets[hash]; | |
| 44 | /* Get the first entry in the bucket. */ | |
| 45 | Entry = bucket->next; | |
| 46 | ||
| 47 | /* Scan through the entries in the bucket for the right XId. */ | |
| 48 | for (; Entry != bucket; Entry = Entry->next) { | |
| 49 | if (Entry->x_id == x_id) { | |
| 50 | /* We have the right XId. */ | |
| 51 | if (Entry->display == dpy) { | |
| 52 | /* We have the right display. */ | |
| 53 | /* We have the right entry! */ | |
| 54 | return(Entry->data); | |
| 55 | } | |
| 56 | /* Oops, identical XId's on different displays! */ | |
| 57 | continue; | |
| 58 | } | |
| 59 | if (Entry->x_id > x_id) { | |
| 60 | /* We have gone past where it should be. */ | |
| 61 | /* It is apparently not in the table. */ | |
| 62 | return(NULL); | |
| 63 | } | |
| 64 | } | |
| 65 | /* It is apparently not in the table. */ | |
| 66 | return(NULL); | |
| 67 | } | |
| 68 |