操作系统课程设计 |
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操作系统课程设计
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一、要求
1．采用高级语言编写程序模拟文件系统，文件系统采用多级目录结构，实现对文件和目录的创建、删除、重命名、变更权限、显示文件内容、修改文件内容等操作。 2．撰写课程设计报告。 二、课程设计内容编写程序模拟一个简单的文件系统，具体实验内容如下： （1）实现多级目录结构，而非二级目录结构。 （2）实现文件和目录的创建、删除、重命名和读写权限控制功能。 （3）实现显示文件内容和更改文件内容的功能。 （4）创建文件或目录时，采用动态申请的方式请求存储空间分配，在删除文件或目录时，还需对申请的空间进行释放。 （5）为观察各种命令执行情况，要求以树形结构直观地显示命令执行后的目录结构。 主要数据结构说明 //用户的结构体 typedef struct USER { char name[100]; //用户名 int userRights; //用户权限 0可编辑文件权限、1为可读可写可删除、2为可读不可写不可删除 、3为不可读不可写不可删除 char account[256]; //用户账号 char password[256]; //用户密码 int state; //登录状态 }USER; //文件的结构体 typedef struct { char name[FILENAME_MAX]; //文件名 char content[FILELEN]; //文件内容 struct FILES* frontFile; //同级目录上一文件 struct FILES* nextFile; //同级目录下一文件 struct FOLDERS* parentFolder; //父目录 int canRead; //是否可读 int canWrite; //是否可写 } FILES; //目录的结构体 typedef struct { char name[256]; //目录名 struct FOLDERS* nextFolder; //同级下一目录 struct FOLDERS* frontFolder; //同级上一目录 struct FOLDERS* parentFolder; //父目录 struct FOLDERS* firstChildFolder; //子目录 struct FILES* firstChildFile; //首个子文件 struct FILES* lastChildFile; //最后一个子文件 int canRead; //是否可读 int canWrite; //是否可写 }FOLDERS;在模拟程序中，应先建立文件系统的根目录，文件系统中的操作都在此目录下完成，且不得直接对根目录操作。 在指定目录下新建立的文件和目录，都通过该目录中最后一个子文件或子目录的nextFile或nextFolder指针建立连接；若该目录之中无任何子文件和子目录，则通过该目录的firstChildFolder或firstChildFile指针建立连接。如图所示。
（1）程序运行时，系统首先根据目录FOLDER结构建立根目录root，并为其分配空间，初始化其信息。 （2）程序给出一个菜单，用户根据菜单选项前的数字，选择要执行的操作命令。 （3）若在根目录下建立子目录，则建立一个新FOLDER并为其分配空间后，利用根目录中的子目录节点指针与该子目录建立连接。 （4）若在根目录下建立文件，则建立一个新FCB并为其分配空间后，利用根目录中的子文件节点指针与该文件建立连接。 （5）对指定文件或目录进行删除、重命名、设置权限等操作时，需要先在文件系统中找到目标文件或目录才可进行下一步的操作，否则提示用户目标文件或目录不存在。 （6）若文件或目录若不具有可读权限，不会在文件系统中显示，处于隐藏状态，但并不代表不存在；文件或目录若不具有可写权限，则不能对在该目录下执行创建，删除，不能重命名该目录；不能更改文件内容。 （7）每次执行操作命令后，为直观地观察执行情况，会显示输出命令执行后的目录结构。 文件系统执行流程如图所示。
编译器：CodeBlocks 20.03 c语言标准：c11 代码主函数以及各定义 #include #include #include #include #define FILENAME_MAX 256 #define FOLDERNAME_MAX 256 #define FILELEN 1000 //用户的结构体 typedef struct USER { char name[100]; //用户名 int userRights; //用户权限 0为最高级权限，3为最低级权限 char account[256]; //用户账号 char password[256]; //用户密码 int state; //登录状态 }USER; //文件的结构体 typedef struct { char name[FILENAME_MAX]; //文件名 char content[FILELEN]; //文件内容 struct FILES* frontFile; //同级目录上一文件 struct FILES* nextFile; //同级目录下一文件 struct FOLDERS* parentFolder; //父目录 int canRead; //是否可读 int canWrite; //是否可写 } FILES; //目录的结构体 typedef struct { char name[FOLDERNAME_MAX]; //目录名 struct FOLDERS* nextFolder; //同级下一目录 struct FOLDERS* frontFolder; //同级上一目录 struct FOLDERS* parentFolder; //父目录 struct FOLDERS* firstChildFolder; //子目录 struct FILES* firstChildFile; //首个子文件 struct FILES* lastChildFile; //最后一个子文件 int canRead; //是否可读 int canWrite; //是否可写 }FOLDERS; int login();//登录函数 struct USER QueryUser(account,pwd);//用户表 void getPath(FOLDERS* nowPath);//获取当前文件夹路径 void getAllFolder(FOLDERS* nowFOLDER, int userRights);//显示当前目录下所有文件夹 void getAllFile(FOLDERS* nowFOLDER, int useRights);//进入文件 void modifyFolder(FOLDERS* handFFOLDER, int userRights);//修改目录 void modifyFile(FILES *handFFILE,int userRights);//修改文件 void backParFolder(FOLDERS *nowFOLDER);//返回父目录 void OperateFolder(FOLDERS* nowFOLDER, int userRights);//操作当前目录下文件夹 void OperateFile(FOLDERS *nowFOLDER,int userRights);//操作当前文件 void CreatRootFolder(FOLDERS* rootFolder);//创建根目录 int main() { FOLDERS* LF, * nowFolder,*parFolder; LF = (FOLDERS*)malloc(sizeof(FOLDERS)); nowFolder = (FOLDERS*)malloc(sizeof(FOLDERS)); parFolder = (FOLDERS*)malloc(sizeof(FOLDERS)); parFolder=NULL; CreatRootFolder(LF);//创建根目录 nowFolder = LF; int Choice = 0; int userRights = 0; userRights = login(); while (1) { printf("------------------------------------\n\n"); getPath(nowFolder); printf("1.查看当前目录下内容\n"); printf("2.返回父目录\n"); printf("3.在当前目录下操作文件夹\n"); printf("4.在当前目录下操作文件\n"); printf("5.退出系统\n"); printf("请输入要进行的操作序号:"); scanf("%d", &Choice); switch (Choice) { case 1: getAllFolder(nowFolder, userRights); getAllFile(nowFolder, userRights); break; case 2: backParFolder(nowFolder); break; case 3: OperateFolder(nowFolder, userRights); break; case 4: OperateFile(nowFolder, userRights); break; case 5: userRights = login(); break; } Choice = 0; } }登录函数 int login() { char account[256]; char pwd[256]; printf("----------登录文件查询系统----------\n"); printf("账号:"); scanf("%s", account); printf("密码:"); scanf("%s", pwd); printf("------------------------------------\n"); USER user = QueryUser(&account, &pwd); if(user.state==0) { printf("登录失败!\n"); login(); } else { printf("用户权限:%d\n", user.userRights); return user.userRights; } }用户信息查询函数 struct USER QueryUser(char account[256], char pwd[256])//查询用户信息 { struct USER userlist[10] = { {"admin",0,"admin","admin",0}, {"user1",1,"user1","123456",0}, {"user2",2,"user2","123456",0}, {"user3",3,"user3","123456",0}, {"user4",2,"user4","12345678",0} }; struct USER FailUser = { "登陆失败",3,"登陆失败","登陆失败",0 }; for (int i = 0; i name)); while (1) { memset(a,'\0',sizeof(a)); a[0]='/'; if (handFOLDER->parentFolder != NULL) { handFOLDER = handFOLDER->parentFolder; strcat(a,handFOLDER->name); strcat(a,nowPath ); strcpy(nowPath,a); } else { printf("当前位置:%s\n", nowPath); break; } } }创建根目录 void CreatRootFolder(FOLDERS* rootFolder) { FOLDERS* r = rootFolder; strcpy(r->name, "root"); r->nextFolder = NULL; r->frontFolder = NULL; r->firstChildFolder = NULL; r->firstChildFile = NULL; r->parentFolder = NULL; r->lastChildFile = NULL; r->canRead = 3; r->canWrite = 0; printf("创建根目录%s成功!\n", r->name); }获取当前目录下所有子目录信息 void getAllFolder(FOLDERS* nowFOLDER, int userRights) { if(nowFOLDER->canRead firstChildFolder == NULL) { printf("当前目录下无子目录\n"); } else { printf("当前目录下的子目录列表：\n"); handFOLDER = handFOLDER->firstChildFolder; printf("/%s\n", handFOLDER->name); while (1) { handFOLDER = handFOLDER->nextFolder; if (handFOLDER->name == NULL) { break; } else { printf("/%s\n", handFOLDER->name); } } } } }获取当前目录下所有文件信息 void getAllFile(FOLDERS* nowFOLDER, int useRights) { if (nowFOLDER->firstChildFile != NULL) { printf("当前目录下子文件列表:\n"); FILES* handFile; handFile = (FILES*)malloc(sizeof(FILES)); handFile = nowFOLDER->firstChildFile; printf("%s\n", handFile->name); while (1) { if (handFile->nextFile == NULL) break; else { handFile = handFile->nextFile; printf("%s\n", handFile->name); } } } else printf("该目录下无文件!\n"); }对单个目录或文件进行修改 void modifyFolder(FOLDERS *modifyFOLDER, int userRights) { printf("当前目录信息:\n"); printf("目录名:%s\n", modifyFOLDER->name); printf("可读权限:%d\n", modifyFOLDER->canRead); printf("可写权限:%d\n", modifyFOLDER->canWrite); while (1) { int Choice = 0; printf("------------------------------------\n\n"); printf("1.文件名\n"); printf("2.可读权限\n"); printf("3.可写权限\n"); printf("4.退出修改\n"); printf("请输入要修改的选项:"); scanf("%d", &Choice); if (Choice == 1) { int flag = 0; char name[256]; FOLDERS* handFOLDER; handFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handFOLDER = modifyFOLDER; printf("请输入新的目录名:"); scanf("%s,", name); while (1) { if (handFOLDER->frontFolder != NULL) { handFOLDER = handFOLDER->frontFolder; if (strcmp(handFOLDER->name, name) && strlen(handFOLDER->name) == strlen(name)) { printf("该目录名已存在!\n"); flag = 1; break; } } else flag = 0; break; } while (1) { if (handFOLDER->nextFolder != NULL && flag == 0) { handFOLDER = handFOLDER->nextFolder; if (strcmp(handFOLDER->name, name) && strlen(handFOLDER->name) == strlen(name)) { printf("该目录名已存在!\n"); flag = 1; break; } } else flag = 0; break; } if (flag == 0) { strcpy(modifyFOLDER->name, name); printf("修改目录名成功!\n"); } } if (Choice == 2) { int read = 3; printf("请输入可读权限:"); scanf("%d", &read); if (read 3) printf("无法修改为低于3的权限!\n"); else { modifyFOLDER->canRead = NULL; modifyFOLDER->canRead = read; printf("修改可读权限成功!\n"); } } if (Choice == 3) { int write = 3; printf("请输入可写权限:"); scanf("%d", &write); if (write 3) printf("无法修改为低于3的权限!\n"); else { modifyFOLDER->canWrite = NULL; modifyFOLDER->canWrite = write; printf("修改可写权限成功!\n"); } } if (Choice == 4) break; } } void modifyFile(FILES *modifyFILE,int userRights){ if(userRights>modifyFILE->canWrite) { printf("用户权限不足无法修改该文件!\n"); return 0; } else { while(1) { int Choice=0; printf("1.文件名\n"); printf("2.可读权限\n"); printf("3.可写权限\n"); printf("4.修改文件内容\n"); printf("5.退出修改\n"); printf("请输入要修改项:"); scanf("%d",&Choice); FILES *handFILE; handFILE = (FILES*)malloc(sizeof(FILES)); handFILE = modifyFILE; if(Choice==1) { int flag=0; char name[256]=""; printf("请输入文件名:"); scanf("%s",name); while(1) { if(handFILE->frontFile!=NULL&&flag==0) { handFILE=handFILE->frontFile; if(strcmp(handFILE->name,name) == 0 && strlen(handFILE->name) == strlen(name)) flag=1; } else if(flag==1) { printf("1该目录下已存在该文件!\n"); break; } else if(handFILE->frontFile==NULL&&flag==0) break; } if(flag==0) { while(1) { if(handFILE->nextFile!=NULL&&flag==0) { handFILE=handFILE->nextFile; if(strcmp(handFILE->name,name) == 0 && strlen(handFILE->name) == strlen(name)) flag=1; } else if(flag==1) { printf("2该目录下已存在该文件!\n"); break; } else if(handFILE->nextFile==NULL&&flag==0) break; } } if(flag==0) { strcpy(modifyFILE->name,name); printf("修改文件名成功!\n"); } } if(Choice==2) { int read=0; printf("请输入可读权限:"); scanf("%d",&read); if(read3) printf("修改的权限不可大于3，修改失败!\n"); else { modifyFILE->canRead=read; printf("修改成功!\n"); } } if(Choice==3) { int write=0; printf("请输入可读权限:"); scanf("%d",&write); if(write3) printf("修改的权限不可大于3，修改失败!\n"); else { modifyFILE->canWrite=write; printf("修改成功!\n"); } } if(Choice==4) { strcpy(modifyFILE->content,""); printf("请输入文件内容以 #! 作为结束符:\n"); int fileslen = 0; char ch; while ((ch = getchar())) { if (ch == '!' && modifyFILE->content[fileslen - 1] == '#') { modifyFILE->content[fileslen] = ch; break; } else { modifyFILE->content[fileslen] = ch; fileslen++; } } printf("修改文件内容成功!\n"); } if(Choice==5) return 0; } } }返回父目录 void backParFolder(FOLDERS *nowFOLDER){ if(nowFOLDER->parentFolder!=NULL) { FOLDERS *parFOLDER; parFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); parFOLDER = nowFOLDER->parentFolder; *nowFOLDER = *parFOLDER; } else printf("无父目录!\n"); return 0; }在当前目录下操作文件夹 void OperateFolder(FOLDERS* nowFOLDER, int userRights) { int Choice; printf("------------------------------------\n\n"); printf("1.进入子目录\n"); printf("2.创建子目录\n"); printf("3.删除子目录\n"); printf("4.修改子目录\n"); printf("5.返回目录操作项\n"); printf("请选择要操作的序列号:"); scanf("%d", &Choice); printf("------------------------------------\n\n"); if (Choice == 1) { char name[100]; printf("请输入要进入的子目录:"); scanf("%s", name); FOLDERS* handFFOLDER; handFFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handFFOLDER = nowFOLDER; if (handFFOLDER->firstChildFolder != NULL) { handFFOLDER = handFFOLDER->firstChildFolder; if (strcmp(handFFOLDER->name, name) == 0 && strlen(name) == strlen(handFFOLDER->name)) { if(userRightscanRead) { printf("handFFOLDER:%s\n", handFFOLDER->name); printf("handFFOLDERparent:%s\n", handFFOLDER->parentFolder); printf("nowfolder:%s\n",nowFOLDER->name); FOLDERS *parFOLDER; parFOLDER=(FOLDERS *)malloc(sizeof (FOLDERS)); strcpy(parFOLDER->name,nowFOLDER->name); parFOLDER->canRead=nowFOLDER->canRead; parFOLDER->canWrite=nowFOLDER->canWrite; parFOLDER->firstChildFile=nowFOLDER->firstChildFile; parFOLDER->firstChildFolder=nowFOLDER->firstChildFolder; parFOLDER->nextFolder=nowFOLDER->nextFolder; parFOLDER->parentFolder=nowFOLDER->parentFolder; parFOLDER->frontFolder=nowFOLDER->frontFolder; parFOLDER->lastChildFile=parFOLDER->lastChildFile; *nowFOLDER=*handFFOLDER ; nowFOLDER->parentFolder=parFOLDER; return 0; } else { printf("用户权限不足无法进入!\n"); return 0 } } else { if (handFFOLDER->nextFolder != NULL) { handFFOLDER = handFFOLDER->nextFolder; while (1) { if (handFFOLDER != NULL) { if (strcmp(handFFOLDER->name, name) == 0 && strlen(name) == strlen(handFFOLDER->name)) { if(userRightscanRead) { FOLDERS *parFOLDER; parFOLDER=(FOLDERS *)malloc(sizeof (FOLDERS)); strcpy(parFOLDER->name,nowFOLDER->name); parFOLDER->canRead=nowFOLDER->canRead; parFOLDER->canWrite=nowFOLDER->canWrite; parFOLDER->firstChildFile=nowFOLDER->firstChildFile; parFOLDER->firstChildFolder=nowFOLDER->firstChildFolder; parFOLDER->nextFolder=nowFOLDER->nextFolder; parFOLDER->parentFolder=nowFOLDER->parentFolder; parFOLDER->frontFolder=nowFOLDER->frontFolder; parFOLDER->lastChildFile=parFOLDER->lastChildFile; *nowFOLDER=*handFFOLDER; nowFOLDER->parentFolder=parFOLDER; return 0; } else { printf("用户权限不足无法进入!\n"); return 0 } } else { handFFOLDER = handFFOLDER->nextFolder; } } else break; } } } printf("该文件夹不存在！\n"); return 0; } else { printf("当前目录下文件夹为空!\n"); return 0; } getAllFolder(handFFOLDER, userRights); } else if (Choice == 2) { FOLDERS* newFOLDER, * handFOLDER;//新的文件夹,目前文件夹 newFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handFOLDER = nowFOLDER; char name[100]; printf("请输入要创建目录的名称："); scanf("%s", newFOLDER->name); newFOLDER->nextFolder = NULL; newFOLDER->firstChildFile = NULL; newFOLDER->firstChildFolder = NULL; newFOLDER->parentFolder = handFOLDER; newFOLDER->canRead = userRights; newFOLDER->canWrite = userRights; newFOLDER->lastChildFile = NULL; if (handFOLDER->firstChildFolder == NULL) { handFOLDER->firstChildFolder = newFOLDER; } else { handFOLDER = handFOLDER->firstChildFolder; while (1) { if (strcmp(handFOLDER->name, newFOLDER->name) == 0 && strlen(handFOLDER->name) == strlen(newFOLDER->name)) { printf("该目录已存在,请修改名称后创建!\n"); return 0; } if (handFOLDER->nextFolder != NULL) handFOLDER = handFOLDER->nextFolder; else { handFOLDER->nextFolder = newFOLDER; newFOLDER->frontFolder = handFOLDER; break; } } } printf("创建新文件夹成功！\n"); getAllFolder(nowFOLDER, userRights); return 0; } if (Choice == 3) { char name[100]; printf("请输入要删除的子目录:"); scanf("%s", name); FOLDERS* handFFOLDER, * handnext; handFFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handnext = (FOLDERS*)malloc(sizeof(FOLDERS)); handFFOLDER = nowFOLDER; if (handFFOLDER->firstChildFolder != NULL) { handFFOLDER = handFFOLDER->firstChildFolder; if (strcmp(handFFOLDER->name, name) == 0 && strlen(handFFOLDER->name) == strlen(name)) { if(userRights>handFFOLDER->canWrite) { printf("权限不足无法删除!\n"); return 0; } else { if (handFFOLDER->nextFolder == NULL) nowFOLDER->firstChildFolder = NULL; else { handFFOLDER = handFFOLDER->nextFolder; nowFOLDER->firstChildFolder = handFFOLDER; handFFOLDER->frontFolder = NULL; } printf("删除目录成功!\n"); return 0; } } else { while (1) { handFFOLDER = handFFOLDER->nextFolder; if (strcmp(handFFOLDER->name, name) == 0 && strlen(handFFOLDER->name) == strlen(name)) { if (handFFOLDER->nextFolder == NULL) { if(userRights>handFFOLDER->canWrite) { printf("权限不足无法删除!\n"); return 0; } else { handFFOLDER = handFFOLDER->frontFolder; handFFOLDER->nextFolder = NULL; printf("删除目录成功!\n"); return 0; } } else { if(userRights>handFFOLDER->canWrite) { printf("权限不足无法删除!\n"); return 0; } else { handnext = handFFOLDER->nextFolder; handFFOLDER = handFFOLDER->frontFolder; handFFOLDER->nextFolder = handnext; handnext->frontFolder = handFFOLDER; printf("删除目录成功!\n"); return 0; } } } if (handFFOLDER->nextFolder == NULL) { printf("该目录不存在!\n"); return 0; } } } } printf("该目录下无子目录!\n"); return 0; } if (Choice == 4) { char name[100]; printf("请输入要修改的子目录:"); scanf("%s", name); FOLDERS* handFFOLDER; handFFOLDER = (FOLDERS*)malloc(sizeof(FOLDERS)); handFFOLDER = nowFOLDER; if (handFFOLDER->firstChildFolder != NULL) { handFFOLDER = handFFOLDER->firstChildFolder; if (strcmp(handFFOLDER->name, name) == 0 && strlen(handFFOLDER->name) == strlen(name)) { printf("userr:%d\n", userRights); if (handFFOLDER->canWrite nextFolder != NULL) { handFFOLDER = handFFOLDER->nextFolder; if (strcmp(handFFOLDER->name,name) == 0 && strlen(handFFOLDER->name) == strlen(name)) { if (handFFOLDER->canWrite firstChildFile != NULL) { char name[256]; printf("请输入要查看的文件名:"); scanf("%s", name); FILES* handFFile; handFFile = (FILES*)malloc(sizeof(FILES)); handFFile = nowFolder->firstChildFile; while (1) { if (strcmp(handFFile, name) == 0 && strlen(handFFile->name) == strlen(name)) { if (handFFile->canRead canRead); printf("文件可写权限:%d\n", handFFile->canWrite); printf("文件内容:\n"); int clen = 0; while (1) { if (handFFile->content[clen] == '#' && handFFile->content[clen + 1] == '!') break; else { printf("%c", handFFile->content[clen]); clen++; } } printf("\n"); return 0; } } else { if (handFFile->nextFile != NULL) handFFile = handFFile->nextFile; else { printf("该目录不存在该文件!\n"); break; } } } } else printf("该目录下无文件夹!\n"); } else if (Choice == 2) { FILES* newFile, * handFile; handFile = (FILES*)malloc(sizeof(FILES)); newFile = (FILES*)malloc(sizeof(FILES)); newFile->parentFolder = nowFolder; newFile->nextFile = NULL; newFile->frontFile = NULL; newFile->canRead = userRights; newFile->canWrite = userRights; printf("请输入文件名:"); scanf("%s", newFile->name); if (nowFolder->firstChildFile == NULL) { nowFolder->firstChildFile = newFile; nowFolder->lastChildFile = newFile; } else { handFile = nowFolder->firstChildFile; while (1) { if (strcmp(handFile->name, newFile->name) == 0 && strlen(handFile->name) == strlen(newFile->name)) { printf("该文件已存在，请更改文件名!\n"); return 0; } if (handFile->nextFile == NULL) { handFile->nextFile = newFile; newFile->frontFile = handFile; nowFolder->lastChildFile = newFile; break; } else handFile = handFile->nextFile; } } printf("请输入文件内容以 #! 作为结束符:\n"); int fileslen = 0; char ch; while ((ch = getchar())) { if (ch == '!' && newFile->content[fileslen - 1] == '#') { newFile->content[fileslen] = ch; break; } else { newFile->content[fileslen] = ch; fileslen++; } } printf("创建新文件%s成功！\n", newFile->name); return 0; } else if (Choice == 3) { if(nowFolder->firstChildFile!=NULL) { FILES *handFFILE; handFFILE = (FILES*)malloc(sizeof(FILES)); handFFILE=nowFolder->firstChildFile; char name[256]; printf("请输入要删除的文件名:"); scanf("%s",name); if(strcmp(handFFILE->name,name)==0&&strlen(handFFILE->name)==strlen(name)) { if(userRights>handFFILE->canWrite) { printf("权限不足无法删除!\n"); return 0; } else { if(handFFILE->nextFile==NULL) { nowFolder->firstChildFile=NULL; handFFILE->parentFolder=NULL; } else { handFFILE->parentFolder=NULL; handFFILE=handFFILE->nextFile; nowFolder->firstChildFile=handFFILE; handFFILE->frontFile=NULL; } printf("删除文件成功!\n"); return 0; } } if(handFFILE->nextFile!=NULL) { while(1) { handFFILE=handFFILE->nextFile; if(strcmp(handFFILE->name,name)==0&&strlen(handFFILE->name)==strlen(name)) { if(userRights>handFFILE->canWrite) { printf("权限不足无法删除!\n"); return 0; } else { if(handFFILE->nextFile==NULL) { handFFILE=handFFILE->frontFile; handFFILE->nextFile=NULL; } else { FILES *handnext; handnext = (FILES*)malloc(sizeof(FILES)); handnext=handFFILE->nextFile; handFFILE=handFFILE->frontFile; handFFILE->nextFile=handnext; handnext->frontFile=handFFILE; } printf("删除文件成功!\n"); return 0; } } if(handFFILE->nextFile==NULL) { printf("该文件不存在!\n"); return 0; } } } } else printf("该目录下不存在文件!\n"); return 0; } else if (Choice == 4) { if(nowFolder->firstChildFile!=NULL) { FILES *handFFILE; handFFILE = (FILES*)malloc(sizeof(FILES)); handFFILE=nowFolder->firstChildFile; char name[256]; printf("请输入要修改的文件名:"); scanf("%s",name); if(strcmp(handFFILE->name,name)==0&&strlen(handFFILE->name)==strlen(name)) { modifyFile(handFFILE,userRights); return 0; } if(handFFILE->nextFile!=NULL) { while(1) { handFFILE=handFFILE->nextFile; if(strcmp(handFFILE->name,name)==0&&strlen(handFFILE->name)==strlen(name)) { modifyFile(handFFILE,userRights); return 0; } if(handFFILE->nextFile==NULL) { printf("该文件不存在!\n"); return 0; } } } } else printf("该目录下不存在文件!\n"); return 0; } else if (Choice == 5) return 0; }以上是本人编写的操作系统课程设计大致内容，程序设计本身还可能存在某些漏洞，欢迎各位大佬指出。 |
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