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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 | ||
24 | /* | |
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 |