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-rw-r--r--oldXMenu/XCrAssoc.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/oldXMenu/XCrAssoc.c b/oldXMenu/XCrAssoc.c
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+/* $XConsortium: XCrAssoc.c,v 10.17 91/01/06 12:04:57 rws Exp $ */
+/* Copyright Massachusetts Institute of Technology 1985 */
+
+/*
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the name of M.I.T. not be used in advertising or
+publicity pertaining to distribution of the software without specific,
+written prior permission. M.I.T. makes no representations about the
+suitability of this software for any purpose. It is provided "as is"
+without express or implied warranty.
+*/
+
+#include <config.h>
+#include <X11/Xlib.h>
+#include <errno.h>
+#include "X10.h"
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+extern int errno;
+
+/*
+ * XCreateAssocTable - Create an XAssocTable. The size argument should be
+ * a power of two for efficiency reasons. Some size suggestions: use 32
+ * buckets per 100 objects; a reasonable maximum number of object per
+ * buckets is 8. If there is an error creating the XAssocTable, a NULL
+ * pointer is returned.
+ */
+XAssocTable *XCreateAssocTable(size)
+ register int size; /* Desired size of the table. */
+{
+ register XAssocTable *table; /* XAssocTable to be initialized. */
+ register XAssoc *buckets; /* Pointer to the first bucket in */
+ /* the bucket array. */
+
+ /* Malloc the XAssocTable. */
+ if ((table = (XAssocTable *)malloc(sizeof(XAssocTable))) == NULL) {
+ /* malloc call failed! */
+ errno = ENOMEM;
+ return(NULL);
+ }
+
+ /* calloc the buckets (actually just their headers). */
+ buckets = (XAssoc *)calloc((unsigned)size, (unsigned)sizeof(XAssoc));
+ if (buckets == NULL) {
+ /* calloc call failed! */
+ errno = ENOMEM;
+ return(NULL);
+ }
+
+ /* Insert table data into the XAssocTable structure. */
+ table->buckets = buckets;
+ table->size = size;
+
+ while (--size >= 0) {
+ /* Initialize each bucket. */
+ buckets->prev = buckets;
+ buckets->next = buckets;
+ buckets++;
+ }
+
+ return(table);
+}