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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* $XConsortium: XLookAssoc.c,v 10.16 91/01/06 12:09:24 rws Exp $ */
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/* Copyright Massachusetts Institute of Technology 1985 */
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/*
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation, and that the name of M.I.T. not be used in advertising or
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publicity pertaining to distribution of the software without specific,
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written prior permission. M.I.T. makes no representations about the
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suitability of this software for any purpose. It is provided "as is"
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without express or implied warranty.
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*/
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#include <X11/Xlib.h>
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#include <X11/Xresource.h>
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#include "X10.h"
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#ifndef NULL
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#define NULL 0
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#endif
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/*
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* XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId.
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* If an appropriately matching XId can be found in the table the routine will
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* return apointer to the data associated with it. If the XId can not be found
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* in the table the routine will return a NULL pointer. All XId's are relative
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* to the currently active Display.
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*/
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caddr_t XLookUpAssoc(dpy, table, x_id)
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register Display *dpy;
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register XAssocTable *table; /* XAssocTable to search in. */
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register XID x_id; /* XId to search for. */
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{
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int hash;
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register XAssoc *bucket;
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register XAssoc *Entry;
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/* Hash the XId to get the bucket number. */
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hash = x_id & (table->size - 1);
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/* Look up the bucket to get the entries in that bucket. */
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bucket = &table->buckets[hash];
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/* Get the first entry in the bucket. */
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Entry = bucket->next;
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/* Scan through the entries in the bucket for the right XId. */
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for (; Entry != bucket; Entry = Entry->next) {
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if (Entry->x_id == x_id) {
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/* We have the right XId. */
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if (Entry->display == dpy) {
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/* We have the right display. */
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/* We have the right entry! */
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return(Entry->data);
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}
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/* Oops, identical XId's on different displays! */
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continue;
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}
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if (Entry->x_id > x_id) {
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/* We have gone past where it should be. */
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/* It is apparently not in the table. */
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return(NULL);
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}
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}
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/* It is apparently not in the table. */
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return(NULL);
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}
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