--- /dev/null
+/* ========================================================================== **
+ * ubi_dLinkList.c
+ *
+ * Copyright (C) 1997, 1998 by Christopher R. Hertel
+ *
+ * Email: crh@ubiqx.mn.org
+ * -------------------------------------------------------------------------- **
+ * This module implements simple doubly-linked lists.
+ * -------------------------------------------------------------------------- **
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * -------------------------------------------------------------------------- **
+ *
+ * Log: ubi_dLinkList.c,v
+ * Revision 0.11 1999/06/19 16:58:06 crh
+ * Renamed the ubi_slRemove() function in ubi_sLinkList to
+ * ubi_slRemoveNext(). I was bothered by the fact that it didn't
+ * match the functionality of the ubi_dlRemove() function in
+ * ubi_dLinkList. The new name is more 'correct'.
+ *
+ * Revision 0.10 1998/07/24 07:30:20 crh
+ * Added the ubi_dlNewList() macro.
+ *
+ * Revision 0.9 1998/06/04 21:29:27 crh
+ * Upper-cased defined constants (eg UBI_BINTREE_H) in some header files.
+ * This is more "standard", and is what people expect. Weird, eh?
+ *
+ * Revision 0.8 1998/06/03 18:06:03 crh
+ * Further fiddling with sys_include.h, which has been moved from the .c file
+ * to the .h file.
+ *
+ * Revision 0.7 1998/06/02 01:38:47 crh
+ * Changed include file name from ubi_null.h to sys_include.h to make it
+ * more generic.
+ *
+ * Revision 0.6 1998/05/20 04:38:05 crh
+ * The C file now includes ubi_null.h. See ubi_null.h for more info.
+ *
+ * Revision 0.5 1998/03/10 02:55:00 crh
+ * Simplified the code and added macros for stack & queue manipulations.
+ *
+ * Revision 0.4 1998/01/03 01:53:56 crh
+ * Added ubi_dlCount() macro.
+ *
+ * Revision 0.3 1997/10/15 03:05:39 crh
+ * Added some handy type casting to the macros. Added AddHere and RemThis
+ * macros.
+ *
+ * Revision 0.2 1997/10/08 03:07:21 crh
+ * Fixed a few forgotten link-ups in Insert(), and fixed the AddHead()
+ * macro, which was passing the wrong value for <After> to Insert().
+ *
+ * Revision 0.1 1997/10/07 04:34:07 crh
+ * Initial Revision.
+ *
+ * -------------------------------------------------------------------------- **
+ * This module is similar to the ubi_sLinkList module, but it is neither a
+ * descendant type nor an easy drop-in replacement for the latter. One key
+ * difference is that the ubi_dlRemove() function removes the indicated node,
+ * while the ubi_slRemoveNext() function (in ubi_sLinkList) removes the node
+ * *following* the indicated node.
+ *
+ * ========================================================================== **
+ */
+
+#include "ubi_dLinkList.h" /* Header for *this* module. */
+
+/* ========================================================================== **
+ * Functions...
+ */
+
+ubi_dlListPtr ubi_dlInitList( ubi_dlListPtr ListPtr )
+ /* ------------------------------------------------------------------------ **
+ * Initialize a doubly-linked list header.
+ *
+ * Input: ListPtr - A pointer to the list structure that is to be
+ * initialized for use.
+ *
+ * Output: A pointer to the initialized list header (i.e., same as
+ * <ListPtr>).
+ *
+ * ------------------------------------------------------------------------ **
+ */
+ {
+ ListPtr->Head = NULL;
+ ListPtr->Tail = NULL;
+ ListPtr->count = 0;
+ return( ListPtr );
+ } /* ubi_dlInitList */
+
+ubi_dlNodePtr ubi_dlInsert( ubi_dlListPtr ListPtr,
+ ubi_dlNodePtr New,
+ ubi_dlNodePtr After )
+ /* ------------------------------------------------------------------------ **
+ * Insert a new node into the list.
+ *
+ * Input: ListPtr - A pointer to the list into which the node is to
+ * be inserted.
+ * New - Pointer to the new node.
+ * After - NULL, or a pointer to a node that is already in the
+ * list.
+ * If NULL, then <New> will be added at the head of the
+ * list, else it will be added following <After>.
+ *
+ * Output: A pointer to the node that was inserted into the list (i.e.,
+ * the same as <New>).
+ *
+ * ------------------------------------------------------------------------ **
+ */
+ {
+ ubi_dlNodePtr PredNode = After ? After : (ubi_dlNodePtr)ListPtr;
+
+ New->Next = PredNode->Next;
+ New->Prev = After;
+ PredNode->Next = New;
+ if( New->Next )
+ New->Next->Prev = New;
+ else
+ ListPtr->Tail = New;
+
+ (ListPtr->count)++;
+
+ return( New );
+ } /* ubi_dlInsert */
+
+ubi_dlNodePtr ubi_dlRemove( ubi_dlListPtr ListPtr, ubi_dlNodePtr Old )
+ /* ------------------------------------------------------------------------ **
+ * Remove a node from the list.
+ *
+ * Input: ListPtr - A pointer to the list from which <Old> is to be
+ * removed.
+ * Old - A pointer to the node that is to be removed from the
+ * list.
+ *
+ * Output: A pointer to the node that was removed (i.e., <Old>).
+ *
+ * ------------------------------------------------------------------------ **
+ */
+ {
+ if( Old )
+ {
+ if( Old->Next )
+ Old->Next->Prev = Old->Prev;
+ else
+ ListPtr->Tail = Old->Prev;
+
+ if( Old->Prev )
+ Old->Prev->Next = Old->Next;
+ else
+ ListPtr->Head = Old->Next;
+
+ (ListPtr->count)--;
+ }
+
+ return( Old );
+ } /* ubi_dlRemove */
+
+/* ================================ The End ================================= */
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