A36 PCB1.1 软件工程整理

fr3092_mcu/components/modules/rpmsg-lite/lib/common/llist.c

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+/*
+ * Copyright (c) 2014, Mentor Graphics Corporation
+ * Copyright 2019 NXP
+ * All rights reserved.
+ *
+ * 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 of Mentor Graphics Corporation 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 HOLDER 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.
+ */
+
+/**************************************************************************
+ * FILE NAME
+ *
+ *       llist.c
+ *
+ * COMPONENT
+ *
+ *         OpenAMP stack.
+ *
+ * DESCRIPTION
+ *
+ *       Source file for basic linked list service.
+ *
+ **************************************************************************/
+#include "llist.h"
+
+#define LIST_NULL ((void *)0)
+/*!
+ * add_to_list
+ *
+ * Places new element at the start of the list.
+ *
+ * @param head - list head
+ * @param node - new element to add
+ *
+ */
+void add_to_list(struct llist **head, struct llist *node)
+{
+    if (node == LIST_NULL)
+    {
+        return;
+    }
+
+    if (*head != LIST_NULL)
+    {
+        /* Place the new element at the start of list. */
+        node->next    = *head;
+        node->prev    = LIST_NULL;
+        (*head)->prev = node;
+        *head         = node;
+    }
+    else
+    {
+        /* List is empty - assign new element to list head. */
+        *head         = node;
+        (*head)->next = LIST_NULL;
+        (*head)->prev = LIST_NULL;
+    }
+}
+
+/*!
+ * remove_from_list
+ *
+ * Removes the given element from the list.
+ *
+ * @param head    - list head
+ * @param element - element to remove from list
+ *
+ */
+void remove_from_list(struct llist **head, struct llist *node)
+{
+    if ((*head == LIST_NULL) || (node == LIST_NULL))
+    {
+        return;
+    }
+
+    if (node == *head)
+    {
+        /* First element has to be removed. */
+        *head = (*head)->next;
+    }
+    else if (node->next == LIST_NULL)
+    {
+        /* Last element has to be removed. */
+        node->prev->next = node->next;
+    }
+    else
+    {
+        /* Intermediate element has to be removed. */
+        node->prev->next = node->next;
+        node->next->prev = node->prev;
+    }
+}