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e745ede7 DL |
1 | /* Copyright Massachusetts Institute of Technology 1985 */ |
2 | ||
3 | /* | |
4 | Permission to use, copy, modify, distribute, and sell this software and its | |
5 | documentation for any purpose is hereby granted without fee, provided that | |
6 | the above copyright notice appear in all copies and that both that | |
7 | copyright notice and this permission notice appear in supporting | |
8 | documentation, and that the name of M.I.T. not be used in advertising or | |
9 | publicity pertaining to distribution of the software without specific, | |
10 | written prior permission. M.I.T. makes no representations about the | |
11 | suitability of this software for any purpose. It is provided "as is" | |
12 | without express or implied warranty. | |
13 | */ | |
14 | ||
15 | #include <X11/Xlib.h> | |
16 | #include <X11/Xresource.h> | |
17 | #include "X10.h" | |
18 | ||
19 | #ifndef NULL | |
20 | #define NULL 0 | |
21 | #endif | |
22 | ||
177c0ea7 | 23 | /* |
e745ede7 DL |
24 | * XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId. |
25 | * If an appropriately matching XId can be found in the table the routine will | |
26 | * return apointer to the data associated with it. If the XId can not be found | |
27 | * in the table the routine will return a NULL pointer. All XId's are relative | |
28 | * to the currently active Display. | |
29 | */ | |
30 | caddr_t XLookUpAssoc(dpy, table, x_id) | |
31 | register Display *dpy; | |
32 | register XAssocTable *table; /* XAssocTable to search in. */ | |
33 | register XID x_id; /* XId to search for. */ | |
34 | { | |
35 | int hash; | |
36 | register XAssoc *bucket; | |
37 | register XAssoc *Entry; | |
38 | ||
39 | /* Hash the XId to get the bucket number. */ | |
40 | hash = x_id & (table->size - 1); | |
41 | /* Look up the bucket to get the entries in that bucket. */ | |
42 | bucket = &table->buckets[hash]; | |
43 | /* Get the first entry in the bucket. */ | |
44 | Entry = bucket->next; | |
45 | ||
46 | /* Scan through the entries in the bucket for the right XId. */ | |
47 | for (; Entry != bucket; Entry = Entry->next) { | |
48 | if (Entry->x_id == x_id) { | |
49 | /* We have the right XId. */ | |
50 | if (Entry->display == dpy) { | |
51 | /* We have the right display. */ | |
52 | /* We have the right entry! */ | |
53 | return(Entry->data); | |
54 | } | |
55 | /* Oops, identical XId's on different displays! */ | |
56 | continue; | |
57 | } | |
58 | if (Entry->x_id > x_id) { | |
59 | /* We have gone past where it should be. */ | |
60 | /* It is apparently not in the table. */ | |
61 | return(NULL); | |
62 | } | |
63 | } | |
64 | /* It is apparently not in the table. */ | |
65 | return(NULL); | |
66 | } | |
67 | ||
6b61353c KH |
68 | /* arch-tag: d5075d0c-4b71-467d-b33c-3f5c4c4afcf2 |
69 | (do not change this comment) */ |