模拟文件管理系统代码

以下是一个简单的C语言模拟文件管理系统的代码，包括文件和目录的创建、删除、重命名、查找等基本操作：

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

#define MAX_NAME_LEN 128
#define MAX_FILE_NUM 1024
#define MAX_DIR_NUM 1024

typedef struct {
    char name[MAX_NAME_LEN];
    char content[MAX_NAME_LEN];
    int size;
    int type; // 0: 文件, 1: 目录
    int parent; // 父目录的下标
} File;

File files[MAX_FILE_NUM];
int file_num = 0;
int dir_num = 1; // 根目录下标为0

void create_file(char *name, char *content, int size, int type, int parent) {
    if (file_num >= MAX_FILE_NUM) {
        printf("Error: file number exceeds the limit!\n");
        return;
    }
    if (strlen(name) >= MAX_NAME_LEN) {
        printf("Error: file name too long!\n");
        return;
    }
    strcpy(files[file_num].name, name);
    strcpy(files[file_num].content, content);
    files[file_num].size = size;
    files[file_num].type = type;
    files[file_num].parent = parent;
    file_num++;
}

void delete_file(int index) {
    if (index < 0 || index >= file_num) {
        printf("Error: invalid file index!\n");
        return;
    }
    if (files[index].type == 1) {
        printf("Error: cannot delete a directory!\n");
        return;
    }
    memmove(&files[index], &files[index+1], sizeof(File) * (file_num - index - 1));
    file_num--;
}

void rename_file(int index, char *new_name) {
    if (index < 0 || index >= file_num) {
        printf("Error: invalid file index!\n");
        return;
    }
    if (strlen(new_name) >= MAX_NAME_LEN) {
        printf("Error: file name too long!\n");
        return;
    }
    strcpy(files[index].name, new_name);
}

int find_file(char *name, int parent) {
    for (int i = 0; i < file_num; i++) {
        if (strcmp(files[i].name, name) == 0 && files[i].parent == parent) {
            return i;
        }
    }
    return -1;
}

void create_dir(char *name, int parent) {
    if (dir_num >= MAX_DIR_NUM) {
        printf("Error: directory number exceeds the limit!\n");
        return;
    }
    if (strlen(name) >= MAX_NAME_LEN) {
        printf("Error: directory name too long!\n");
        return;
    }
    create_file(name, "", 0, 1, parent);
    dir_num++;
}

void delete_dir(int index) {
    if (index < 0 || index >= file_num) {
        printf("Error: invalid directory index!\n");
        return;
    }
    if (files[index].type == 0) {
        printf("Error: cannot delete a file!\n");
        return;
    }
    for (int i = 0; i < file_num; i++) {
        if (files[i].parent == index) {
            delete_file(i);
            i--;
        }
    }
    delete_file(index);
    dir_num--;
}

void rename_dir(int index, char *new_name) {
    if (index < 0 || index >= file_num) {
        printf("Error: invalid directory index!\n");
        return;
    }
    if (strlen(new_name) >= MAX_NAME_LEN) {
        printf("Error: directory name too long!\n");
        return;
    }
    rename_file(index, new_name);
}

void list_files(int parent) {
    printf("Name\tType\tSize\tContent\n");
    for (int i = 0; i < file_num; i++) {
        if (files[i].parent == parent) {
            printf("%s\t%s\t%d\t%s\n", files[i].name, files[i].type == 0 ? "file" : "dir", files[i].size, files[i].content);
        }
    }
}

int main() {
    create_dir("root", -1);
    create_file("test.txt", "hello world!", 12, 0, 0);
    create_dir("subdir", 0);
    list_files(0);
    delete_dir(1);
    list_files(0);
    return 0;
}

注：以上代码仅为示例，可能存在一些不足之处，仅供参考。