Commit 热身赛一级赛题3

APP_Framework/Applications/app_test/Kconfig

@@ -240,5 +240,9 @@ menu "test app"
                 bool "Config test soft timer"
                 default n
             
+            menuconfig USER_TEST_RADIX
+                bool "Config test radix tree"
+                default n
+            
         endif
 endmenu

APP_Framework/Applications/app_test/Makefile

@@ -101,5 +101,9 @@ ifeq ($(CONFIG_ADD_XIZI_FETURES),y)
         SRC_FILES += test_timer.c
     endif
 
+    ifeq ($(CONFIG_USER_TEST_RADIX),y)
+        SRC_FILES += test_radix_tree/test_radix_tree.c
+    endif    
+
     include $(KERNEL_ROOT)/compiler.mk
 endif

APP_Framework/Applications/app_test/test_radix_tree/README.md

@@ -0,0 +1,63 @@
+# 基数树
+
+## 代码实现
+
+基数树节点设计为：
+
+```C
+typedef struct _node {
+    void* value;
+    struct _node* next[NODE_SIZE];
+} node;
+```
+
+其中，`NODE_SIZE` 定义为 128，足以容纳所有 ASCII 值。
+
+一共实现了 5 个函数，分别为：
+
+- `CreateNode`：创建一个基数树节点
+- `InsertNode`：将一对键值对插入基数树
+- `DeleteNode`：删除指定键的键值对
+- `FindNode`：查找指定键对应的值
+- `DestroyTree`：销毁整个基数树
+
+## 程序测试
+
+测试程序 `TestRadix` 已经注册为 shell 命令，可以调用执行。
+
+测试程序定义了以下键值对：
+
+```c
+char keys[][MAX_WORD_LEN] = {
+    "what",
+    "where",
+    "why",
+    "how",
+    "hello!",
+    "apple",
+    "12345"
+};
+int values[] = {1, 2, 3, 4, 5, 6, 7};
+```
+
+1. 程序的第一部分创建了基数树，并且将定义的 7 个键值对的前 6 个插入了基数树，然后分别查找 7 个键，前 6 个均可以找到对应的值，最后一个未插入，因此无法找到
+2. 程序的第二部分从基数树中删除了 `where` 和 `how` 两个键，再次分别查找 7 个键，删除的键值对和未插入的键值对均无法找到
+3. 程序的第三部分重新插入了已删除的 `where` 和未插入过的 `12345` ，再次分别查找 7 个键，新插入的值可以检索到
+4. 程序的第四部分将基数树销毁，再次分别查找 7 个键，所有的键值对均无法找到
+
+## 流程记录
+
+1. 在工作区终端中输入命令：`make BOARD=k210-emulator menuconfig`，进入配置页面
+![fig1](fig1.png)
+2. 依次进入 `APP_Framework` -> `Applications` -> `test app` 目录，将 `Enable application test function` 选项置为 `Y`
+![fig2](fig2.png)
+3. 进入 `Enable application test function` 将 `Config test radix tree` 选项置为 `Y`
+![fig3](fig3.png)
+4. 一直选择 `Exit` 退出配置，在最后需要确认的页面选择 `Yes` 保存配置
+![fig4](fig4.png)
+5. 执行编译命令：`make BOARD=k210-emulator`，正常情况下应当编译无误
+![fig5](fig5.png)
+6. 在 `qemu` 中运行：`qemu-system-riscv64 -nographic -machine sifive_u -bios build/XiZi-k210-emulator.elf`
+![fig6](fig6.png)
+7. 在 shell 中运行命令 `TestRadix`，执行结果与预期一致，验证完成。
+![fig7](fig7.png)

APP_Framework/Applications/app_test/test_radix_tree/test_radix_tree.c

@@ -0,0 +1,194 @@
+/**
+* @file:    test_radix_tree.c
+* @brief:   Implement a simple radix tree
+* @version: 1.0
+* @date:    2023/5/24
+*/
+
+#include <transform.h>
+
+#define NODE_SIZE 128
+#define MAX_WORD_LEN 128
+
+typedef struct _node {
+    void* value;
+    struct _node* next[NODE_SIZE];
+} node;
+
+/**
+ * @description: Create a radix tree node
+ * @return node pointer
+ */
+node* CreateNode()
+{
+    node* n = (node*)malloc(sizeof(node));
+    n->value = NULL;
+    for (int i = 0; i < NODE_SIZE; i++) {
+        n->next[i] = NULL;
+    }
+    return n;
+}
+
+/**
+ * @description: Insert a new node to radix tree
+ * @param root - radix tree root
+ * @param key - new node key
+ * @param value - new node value
+ * @return void
+ */
+void InsertNode(node* root, const char* key, void* value)
+{
+    if (root == NULL) {
+        return;
+    }
+    node* cur = root;
+    size_t len = strlen(key);
+    for (size_t i = 0; i < len; i++) {
+        uint8_t b = (uint8_t)key[i];
+        if (cur->next[b] == NULL) {
+            cur->next[b] = CreateNode();
+        }
+        cur = cur->next[b];
+    }
+    cur->value = value;
+}
+
+/**
+ * @description: Delete a node from radix tree
+ * @param root - radix tree root
+ * @param key - key which is needed to delete
+ * @return void
+ */
+void DeleteNode(node* root, const char* key)
+{
+    if (root == NULL) {
+        return;
+    }
+    node** cur = &root;
+    size_t len = strlen(key);
+    for (size_t i = 0; i < len; i++) {
+        uint8_t b = (uint8_t)key[i];
+        if ((*cur)->next[b] == NULL) {
+            return;
+        }
+        cur = &((*cur)->next[b]);
+    }
+
+    if ((*cur)->value == NULL) {
+        return;
+    }
+
+    (*cur)->value = NULL;
+
+    int has_children = 0;
+    for (int i = 0; i < NODE_SIZE; i++) {
+        if ((*cur)->next[i] != NULL) {
+            has_children = 1;
+            break;
+        }
+    }
+    if (!has_children) {
+        free(*cur);
+        (*cur) = NULL;
+    }
+}
+
+/**
+ * @description: find a node by key
+ * @param root - radix tree root
+ * @param key - key which is needed to find
+ * @return value pointer corresponding to key
+ */
+void* FindNode(node* root, const char* key)
+{
+    if (root == NULL) {
+        return NULL;
+    }
+    node* cur = root;
+    size_t len = strlen(key);
+    for (size_t i = 0; i < len; i++) {
+        uint8_t b = (uint8_t)key[i];
+        if (cur->next[b] == NULL) {
+            return NULL;
+        }
+        cur = cur->next[b];
+    }
+    return cur->value;
+}
+
+/**
+ * @description: Destroy the radix tree
+ * @param root - radix tree root
+ * @return void
+ */
+void DestroyTree(node* root)
+{
+    if (root == NULL) {
+        return;
+    }
+    for (int i = 0; i < NODE_SIZE; i++) {
+        DestroyTree(root->next[i]);
+    }
+    free(root);
+}
+
+void TestRadix()
+{
+    char keys[][MAX_WORD_LEN] = {
+        "what",
+        "where",
+        "why",
+        "how",
+        "hello!",
+        "apple",
+        "12345"
+    };
+    int values[] = {1, 2, 3, 4, 5, 6, 7};
+
+    printf("\nCreate tree and add key & value:\n");
+    node* root = CreateNode();
+    if (!root) printf("Create node failed.\n");
+
+    int num = sizeof(keys) / sizeof(keys[0]);
+    for (int i = 0; i < num - 1; ++i) {
+        InsertNode(root, keys[i], &values[i]);
+    }
+
+    for (int i = 0; i < num; ++i) {
+        int* v = (int*)FindNode(root, keys[i]);
+        if (v) printf("keys[%d] \"%s\"'v = %d, values[%d] = %d\n", i, keys[i], *v, i, values[i]);
+        else printf("keys[%d] \"%s\" not found\n", i, keys[i]);
+    }
+
+    printf("\nDelete \"where\" and \"how\":\n");
+    DeleteNode(root, keys[1]);
+    DeleteNode(root, keys[3]);
+    
+    for (int i = 0; i < num; ++i) {
+        int* v = (int*)FindNode(root, keys[i]);
+        if (v) printf("keys[%d] \"%s\"'v = %d, values[%d] = %d\n", i, keys[i], *v, i, values[i]);
+        else printf("keys[%d] \"%s\" not found\n", i, keys[i]);
+    }
+
+    printf("\nInsert \"where\" and \"12345\":\n");
+    InsertNode(root, keys[1], &values[1]);
+    InsertNode(root, keys[6], &values[6]);
+
+    for (int i = 0; i < num; ++i) {
+        int* v = (int*)FindNode(root, keys[i]);
+        if (v) printf("keys[%d] \"%s\"'v = %d, values[%d] = %d\n", i, keys[i], *v, i, values[i]);
+        else printf("keys[%d] \"%s\" not found\n", i, keys[i]);
+    }
+
+    printf("\nDestroy tree:\n");
+    DestroyTree(root);
+    root = NULL;
+
+    for (int i = 0; i < num; ++i) {
+        int* v = (int*)FindNode(root, keys[i]);
+        if (v) printf("keys[%d] \"%s\"'v = %d, values[%d] = %d\n", i, keys[i], *v, i, values[i]);
+        else printf("keys[%d] \"%s\" not found\n", i, keys[i]);
+    }
+}
+
+PRIV_SHELL_CMD_FUNCTION(TestRadix, Implement a simple radix tree, PRIV_SHELL_CMD_MAIN_ATTR);