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/* Copyright Massachusetts Institute of Technology 1985 */
#include "copyright.h"
#include "XMenuInt.h"
#include <X11/Xresource.h>
#include <errno.h>
#ifndef NULL
#define NULL 0
#endif
/*
* XMakeAssoc - Insert data into an XAssocTable keyed on an XId.
* Data is inserted into the table only once. Redundant inserts are
* meaningless (but cause no problems). The queue in each association
* bucket is sorted (lowest XId to highest XId).
*/
void
XMakeAssoc(register Display *dpy, register XAssocTable *table, register XID x_id, register void *data)
{
int hash;
register XAssoc *bucket;
register XAssoc *Entry;
register XAssoc *new_entry;
/* Hash the XId to get the bucket number. */
hash = x_id & (table->size - 1);
/* Look up the bucket to get the entries in that bucket. */
bucket = &table->buckets[hash];
/* Get the first entry in the bucket. */
Entry = bucket->next;
/* If (Entry != bucket), the bucket is empty so make */
/* the new entry the first entry in the bucket. */
/* if (Entry == bucket), the we have to search the */
/* bucket. */
if (Entry != bucket) {
/* The bucket isn't empty, begin searching. */
/* If we leave the for loop then we have either passed */
/* where the entry should be or hit the end of the bucket. */
/* In either case we should then insert the new entry */
/* before the current value of "Entry". */
for (; Entry != bucket; Entry = Entry->next) {
if (Entry->x_id == x_id) {
/* Entry has the same XId... */
if (Entry->display == dpy) {
/* Entry has the same Display... */
/* Therefore there is already an */
/* entry with this XId and Display, */
/* reset its data value and return. */
Entry->data = data;
return;
}
/* We found an association with the right */
/* id but the wrong display! */
continue;
}
/* If the current entry's XId is greater than the */
/* XId of the entry to be inserted then we have */
/* passed the location where the new XId should */
/* be inserted. */
if (Entry->x_id > x_id) break;
}
}
/* If we are here then the new entry should be inserted just */
/* before the current value of "Entry". */
/* Create a new XAssoc and load it with new provided data. */
new_entry = (XAssoc *) malloc(sizeof(XAssoc));
if (!new_entry)
return; /* This obsolete API has no way to report failure! */
new_entry->display = dpy;
new_entry->x_id = x_id;
new_entry->data = data;
/* Insert the new entry. */
emacs_insque((struct qelem *)new_entry, (struct qelem *)Entry->prev);
}
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