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103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/* $XConsortium: XMakeAssoc.c,v 10.18 91/01/06 12:09:28 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 <config.h>
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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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#include <errno.h>
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#ifndef NULL
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#define NULL 0
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#endif
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extern int errno;
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void emacs_insque();
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struct qelem {
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struct qelem *q_forw;
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struct qelem *q_back;
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char q_data[1];
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};
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/*
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* XMakeAssoc - Insert data into an XAssocTable keyed on an XId.
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* Data is inserted into the table only once. Redundant inserts are
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* meaningless (but cause no problems). The queue in each association
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* bucket is sorted (lowest XId to highest XId).
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*/
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XMakeAssoc(dpy, table, x_id, data)
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register Display *dpy;
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register XAssocTable *table;
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register XID x_id;
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register caddr_t data;
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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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register XAssoc *new_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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/* If (Entry != bucket), the bucket is empty so make */
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/* the new entry the first entry in the bucket. */
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/* if (Entry == bucket), the we have to search the */
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/* bucket. */
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if (Entry != bucket) {
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/* The bucket isn't empty, begin searching. */
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/* If we leave the for loop then we have either passed */
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/* where the entry should be or hit the end of the bucket. */
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/* In either case we should then insert the new entry */
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/* before the current value of "Entry". */
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for (; Entry != bucket; Entry = Entry->next) {
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if (Entry->x_id == x_id) {
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/* Entry has the same XId... */
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if (Entry->display == dpy) {
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/* Entry has the same Display... */
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/* Therefore there is already an */
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/* entry with this XId and Display, */
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/* reset its data value and return. */
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Entry->data = data;
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return;
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}
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/* We found an association with the right */
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/* id but the wrong display! */
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continue;
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}
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/* If the current entry's XId is greater than the */
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/* XId of the entry to be inserted then we have */
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/* passed the location where the new XId should */
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/* be inserted. */
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if (Entry->x_id > x_id) break;
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}
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}
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/* If we are here then the new entry should be inserted just */
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/* before the current value of "Entry". */
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/* Create a new XAssoc and load it with new provided data. */
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new_entry = (XAssoc *) xmalloc(sizeof(XAssoc));
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new_entry->display = dpy;
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new_entry->x_id = x_id;
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new_entry->data = data;
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/* Insert the new entry. */
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emacs_insque((struct qelem *)new_entry, (struct qelem *)Entry->prev);
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}
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