This code manages a simple doubly-linked list.

(This used to be commit a88ae60fc33e3598f46dfc38e930e261d5e06888)

1 files changed, 146 insertions, 0 deletions

diff --git a/source3/ubi_dLinkList.c b/source3/ubi_dLinkList.c
new file mode 100644
index 0000000000..49bf495b9d
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+++ b/source3/ubi_dLinkList.c
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+/* ========================================================================== **
+ *                              ubi_dLinkList.c
+ *
+ *  Copyright (C) 1997 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.
+ *
+ * -------------------------------------------------------------------------- **
+ *
+ * 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.
+ *
+ *
+ * ========================================================================== **
+ */
+
+#include "ubi_dLinkList.h"
+
+/* ========================================================================== **
+ * 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>).
+   *
+   * ------------------------------------------------------------------------ **
+   */
+  {
+  if( NULL == After )
+    {
+    New->Next           = ListPtr->Head;
+    New->Prev           = NULL;
+    if( NULL != ListPtr->Head )
+      ListPtr->Head->Prev = New;
+    else
+      ListPtr->Tail       = New;
+    ListPtr->Head       = New;
+    }
+  else
+    {
+    New->Next         = After->Next;
+    New->Prev         = After;
+    if( NULL != After->Next )
+      After->Next->Prev = New;
+    else
+      ListPtr->Tail       = New;
+    After->Next       = 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( NULL != 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 ================================= */