Trying to recover from deleted directory contents

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5329 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 87 insertions, 0 deletions

diff --git a/nuttx/lib/queue/sq_remlast.c b/nuttx/lib/queue/sq_remlast.c
new file mode 100644
index 000000000..92cdbde98
--- /dev/null
+++ b/nuttx/lib/queue/sq_remlast.c
@@ -0,0 +1,87 @@
+/************************************************************
+ * lib/queue/sq_remlast.c
+ *
+ *   Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <queue.h>
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: sq_remlast
+ *
+ * Description:
+ *   Removes the last entry in a singly-linked queue.
+ *
+ ************************************************************/
+
+FAR sq_entry_t *sq_remlast(sq_queue_t *queue)
+{ 
+  FAR sq_entry_t *ret = queue->tail;
+
+  if (ret)
+    {
+      if (queue->head == queue->tail)
+        {
+          queue->head = NULL;
+          queue->tail = NULL;
+        }
+      else
+        {
+          FAR sq_entry_t *prev;
+          for(prev = queue->head;
+              prev && prev->flink != ret;
+              prev = prev->flink);
+
+          if (prev)
+            {
+              prev->flink = NULL;
+              queue->tail = prev;
+            }
+        }
+
+      ret->flink = NULL;
+    }
+
+  return ret;
+}