Diff: btstack/linked_list.c

Revision:

0:fccb789424fc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/btstack/linked_list.c	Mon Jun 10 16:01:50 2013 +0000
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2009-2012 by Matthias Ringwald
+ *
+ * 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 the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD 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 MATTHIAS
+ * RINGWALD 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.
+ *
+ * Please inquire about commercial licensing options at btstack@ringwald.ch
+ *
+ */
+
+/*
+ *  linked_list.c
+ *
+ *  Created by Matthias Ringwald on 7/13/09.
+ */
+
+#include <btstack/linked_list.h>
+#include <stdlib.h>
+/**
+ * tests if list is empty
+ */
+int  linked_list_empty(linked_list_t * list){
+    return *list == (void *) 0;
+}
+
+/**
+ * linked_list_get_last_item
+ */
+linked_item_t * linked_list_get_last_item(linked_list_t * list){        // <-- find the last item in the list
+    linked_item_t *lastItem = NULL;
+    linked_item_t *it;
+    for (it = *list; it ; it = it->next){
+        if (it) {
+            lastItem = it;
+        }
+    }
+    return lastItem;
+}
+
+
+/**
+ * linked_list_add
+ */
+void linked_list_add(linked_list_t * list, linked_item_t *item){        // <-- add item to list
+    // check if already in list
+    linked_item_t *it;
+    for (it = *list; it ; it = it->next){
+        if (it == item) {
+            return;
+        }
+    }
+    // add first
+    item->next = *list;
+    *list = item;
+}
+
+void linked_list_add_tail(linked_list_t * list, linked_item_t *item){   // <-- add item to list as last element
+    // check if already in list
+    linked_item_t *it;
+    for (it = (linked_item_t *) list; it->next ; it = it->next){
+        if (it->next == item) {
+            return;
+        }
+    }
+    item->next = (linked_item_t*) 0;
+    it->next = item;
+}
+
+/**
+ * Remove data_source from run loop
+ *
+ * @note: assumes that data_source_t.next is first element in data_source
+ */
+int  linked_list_remove(linked_list_t * list, linked_item_t *item){    // <-- remove item from list
+    linked_item_t *it;
+    for (it = (linked_item_t *) list; it ; it = it->next){
+        if (it->next == item){
+            it->next =  item->next;
+            return 0;
+        }
+    }
+    return -1;
+}
+
+void linked_item_set_user(linked_item_t *item, void *user_data){
+    item->next = (linked_item_t *) 0;
+    item->user_data = user_data;
+}
+
+void * linked_item_get_user(linked_item_t *item) {
+    return item->user_data;
+}
+
+#if 0
+#include <stdio.h>
+void test_linked_list(){
+    linked_list_t testList = 0;
+    linked_item_t itemA;
+    linked_item_t itemB;
+    linked_item_t itemC;
+    linked_item_set_user(&itemA, (void *) 0);
+    linked_item_set_user(&itemB, (void *) 0);
+    linked_list_add(&testList, &itemA);
+    linked_list_add(&testList, &itemB);
+    linked_list_add_tail(&testList, &itemC);
+    // linked_list_remove(&testList, &itemB);
+    linked_item_t *it;
+    for (it = (linked_item_t *) &testList; it ; it = it->next){
+        if (it->next == &itemA) printf("Item A\n");
+        if (it->next == &itemB) printf("Item B\n");
+        if (it->next == &itemC) printf("Item C\n");
+        /* if (it->next == &itemB){
+            it->next =  it->next;
+            printf(" remove\n");
+        } else {
+            printf(" keep\n");
+        
+         */
+    }
+}
+#endif