C语言编写代码实现 Format:对文件存储器进行格式化,即按照文件系统的结 构对虚拟磁盘空间进行布局,并在其上创建根目录以及用于 管理文件存储空间等的数据结构。mkdir:创建子目录。 rmdir:删除子目录。ls:显示目录。cd:更改当前目录。create:创建文件。rm:删除文件。main:调用上述操作。

以下是一个简单的C语言实现文件系统管理的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#define MAX_FILENAME_LENGTH 100
#define MAX_FILESYSTEM_SIZE 1024

// 文件类型
typedef enum {
    FILE_TYPE_FILE,
    FILE_TYPE_DIRECTORY
} file_type_t;

// 文件节点
typedef struct {
    char *name; // 文件名
    file_type_t type; // 文件类型
    int size; // 文件大小
    int start_block; // 起始磁盘块号
} file_node_t;

// 文件系统
typedef struct {
    file_node_t *root_directory; // 根目录
    int *disk; // 磁盘
    int disk_size; // 磁盘大小
} file_system_t;

// 初始化文件系统
void init_file_system(file_system_t *fs) {
    // 初始化磁盘
    fs->disk = (int*)malloc(sizeof(int) * MAX_FILESYSTEM_SIZE);
    memset(fs->disk, 0, sizeof(int) * MAX_FILESYSTEM_SIZE);
    fs->disk_size = MAX_FILESYSTEM_SIZE;

    // 初始化根目录
    fs->root_directory = (file_node_t*)malloc(sizeof(file_node_t));
    fs->root_directory->name = "/";
    fs->root_directory->type = FILE_TYPE_DIRECTORY;
    fs->root_directory->size = 0;
    fs->root_directory->start_block = 0;
}

// 创建文件
void create_file(file_system_t *fs, char *name, int size) {
    // 查找空闲磁盘块
    int start_block = -1;
    for (int i = 0; i < fs->disk_size; i++) {
        if (fs->disk[i] == 0) {
            start_block = i;
            break;
        }
    }
    if (start_block == -1) {
        printf("Error: Disk is full!\n");
        return;
    }

    // 创建文件节点
    file_node_t *file_node = (file_node_t*)malloc(sizeof(file_node_t));
    file_node->name = name;
    file_node->type = FILE_TYPE_FILE;
    file_node->size = size;
    file_node->start_block = start_block;

    // 更新磁盘
    for (int i = start_block; i < start_block + size; i++) {
        fs->disk[i] = 1;
    }

    // 将文件节点添加到根目录
    file_node_t **children = (file_node_t**)malloc(sizeof(file_node_t*) * (fs->root_directory->size + 1));
    memcpy(children, fs->root_directory + 1, sizeof(file_node_t*) * fs->root_directory->size);
    children[fs->root_directory->size] = file_node;
    free(fs->root_directory->children);
    fs->root_directory->children = children;
    fs->root_directory->size++;
}

// 创建目录
void create_directory(file_system_t *fs, char *name) {
    // 创建目录节点
    file_node_t *directory_node = (file_node_t*)malloc(sizeof(file_node_t));
    directory_node->name = name;
    directory_node->type = FILE_TYPE_DIRECTORY;
    directory_node->size = 0;
    directory_node->start_block = -1;

    // 将目录节点添加到根目录
    file_node_t **children = (file_node_t**)malloc(sizeof(file_node_t*) * (fs->root_directory->size + 1));
    memcpy(children, fs->root_directory + 1, sizeof(file_node_t*) * fs->root_directory->size);
    children[fs->root_directory->size] = directory_node;
    free(fs->root_directory->children);
    fs->root_directory->children = children;
    fs->root_directory->size++;
}

// 删除文件或目录
void delete_file_or_directory(file_system_t *fs, char *name) {
    // 在根目录中查找文件或目录
    int index = -1;
    for (int i = 0; i < fs->root_directory->size; i++) {
        if (strcmp(fs->root_directory->children[i]->name, name) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("Error: File or directory not found!\n");
        return;
    }

    // 删除文件或目录节点
    file_node_t *node = fs->root_directory->children[index];
    free(node->name);
    free(node);

    // 更新磁盘
    if (node->type == FILE_TYPE_FILE) {
        for (int i = node->start_block; i < node->start_block + node->size; i++) {
            fs->disk[i] = 0;
        }
    }

    // 将文件或目录从根目录中删除
    file_node_t **children = (file_node_t**)malloc(sizeof(file_node_t*) * (fs->root_directory->size - 1));
    memcpy(children, fs->root_directory + 1, sizeof(file_node_t*) * index);
    memcpy(children + index, fs->root_directory + index + 1, sizeof(file_node_t*) * (fs->root_directory->size - index - 1));
    free(fs->root_directory->children);
    fs->root_directory->children = children;
    fs->root_directory->size--;
}

// 显示目录的文件和子目录列表
void list_directory(file_system_t *fs, char *name) {
    // 在根目录中查找目录
    int index = -1;
    for (int i = 0; i < fs->root_directory->size; i++) {
        if (strcmp(fs->root_directory->children[i]->name, name) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("Error: Directory not found!\n");
        return;
    }

    // 列出目录的文件和子目录
    file_node_t *directory_node = fs->root_directory->children[index];
    for (int i = 0; i < directory_node->size; i++) {
        printf("%s\n", directory_node->children[i]->name);
    }
}

// 改变当前目录
void change_directory(file_system_t *fs, char *name) {
    // 在根目录中查找目录
    int index = -1;
    for (int i = 0; i < fs->root_directory->size; i++) {
        if (strcmp(fs->root_directory->children[i]->name, name) == 0) {
            index = i;
            break;
        }
    }
    if (index == -1 || fs->root_directory->children[index]->type != FILE_TYPE_DIRECTORY) {
        printf("Error: Directory not found!\n");
        return;
    }

    // 更改当前目录
    fs->root_directory = fs->root_directory->children[index];
}

int main() {
    file_system_t fs;
    init_file_system(&fs);

    create_directory(&fs, "dir1");
    create_directory(&fs, "dir2");
    create_file(&fs, "file1", 10);
    create_file(&fs, "file2", 20);

    list_directory(&fs, "/");
    change_directory(&fs, "dir1");
    list_directory(&fs, ".");
    change_directory(&fs, "..");
    delete_file_or_directory(&fs, "file1");
    list_directory(&fs, ".");
    delete_file_or_directory(&fs, "dir1");
    list_directory(&fs, "/");
    
    return 0;
}

上述代码实现了格式化文件系统、创建文件和目录、删除文件和目录、显示目录的文件和子目录列表以及改变当前目录等操作。这只是一个简单的示例代码，实际应用中可能需要更复杂的实现。