HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| e745ede7 DL |
1 | /* $XConsortium: XMakeAssoc.c,v 10.18 91/01/06 12:09:28 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 <config.h> | |
| 17 | #include <X11/Xlib.h> | |
| 18 | #include <X11/Xresource.h> | |
| 19 | #include "X10.h" | |
| 20 | #include <errno.h> | |
| 21 | ||
| 22 | #ifndef NULL | |
| 23 | #define NULL 0 | |
| 24 | #endif | |
| 25 | ||
| 26 | extern int errno; | |
| 27 | ||
| 28 | void emacs_insque(); | |
| 29 | struct qelem { | |
| 30 | struct qelem *q_forw; | |
| 31 | struct qelem *q_back; | |
| 32 | char q_data[1]; | |
| 33 | }; | |
| 34 | /* | |
| 35 | * XMakeAssoc - Insert data into an XAssocTable keyed on an XId. | |
| 36 | * Data is inserted into the table only once. Redundant inserts are | |
| 37 | * meaningless (but cause no problems). The queue in each association | |
| 38 | * bucket is sorted (lowest XId to highest XId). | |
| 39 | */ | |
| 40 | XMakeAssoc(dpy, table, x_id, data) | |
| 41 | register Display *dpy; | |
| 42 | register XAssocTable *table; | |
| 43 | register XID x_id; | |
| 44 | register caddr_t data; | |
| 45 | { | |
| 46 | int hash; | |
| 47 | register XAssoc *bucket; | |
| 48 | register XAssoc *Entry; | |
| 49 | register XAssoc *new_entry; | |
| 50 | ||
| 51 | /* Hash the XId to get the bucket number. */ | |
| 52 | hash = x_id & (table->size - 1); | |
| 53 | /* Look up the bucket to get the entries in that bucket. */ | |
| 54 | bucket = &table->buckets[hash]; | |
| 55 | /* Get the first entry in the bucket. */ | |
| 56 | Entry = bucket->next; | |
| 57 | ||
| 58 | /* If (Entry != bucket), the bucket is empty so make */ | |
| 59 | /* the new entry the first entry in the bucket. */ | |
| 60 | /* if (Entry == bucket), the we have to search the */ | |
| 61 | /* bucket. */ | |
| 62 | if (Entry != bucket) { | |
| 63 | /* The bucket isn't empty, begin searching. */ | |
| 64 | /* If we leave the for loop then we have either passed */ | |
| 65 | /* where the entry should be or hit the end of the bucket. */ | |
| 66 | /* In either case we should then insert the new entry */ | |
| 67 | /* before the current value of "Entry". */ | |
| 68 | for (; Entry != bucket; Entry = Entry->next) { | |
| 69 | if (Entry->x_id == x_id) { | |
| 70 | /* Entry has the same XId... */ | |
| 71 | if (Entry->display == dpy) { | |
| 72 | /* Entry has the same Display... */ | |
| 73 | /* Therefore there is already an */ | |
| 74 | /* entry with this XId and Display, */ | |
| 75 | /* reset its data value and return. */ | |
| 76 | Entry->data = data; | |
| 77 | return; | |
| 78 | } | |
| 79 | /* We found an association with the right */ | |
| 80 | /* id but the wrong display! */ | |
| 81 | continue; | |
| 82 | } | |
| 83 | /* If the current entry's XId is greater than the */ | |
| 84 | /* XId of the entry to be inserted then we have */ | |
| 85 | /* passed the location where the new XId should */ | |
| 86 | /* be inserted. */ | |
| 87 | if (Entry->x_id > x_id) break; | |
| 88 | } | |
| 89 | } | |
| 90 | ||
| 91 | /* If we are here then the new entry should be inserted just */ | |
| 92 | /* before the current value of "Entry". */ | |
| 93 | /* Create a new XAssoc and load it with new provided data. */ | |
| 94 | new_entry = (XAssoc *) xmalloc(sizeof(XAssoc)); | |
| 95 | new_entry->display = dpy; | |
| 96 | new_entry->x_id = x_id; | |
| 97 | new_entry->data = data; | |
| 98 | ||
| 99 | /* Insert the new entry. */ | |
| 100 | emacs_insque((struct qelem *)new_entry, (struct qelem *)Entry->prev); | |
| 101 | } | |
| 102 |