#include"stdio.h"
#include"string.h"
typedef struct _directory{
char name[20];
int begin;
int length;
char owner[10];
}Directory;
FILE *dir,*file;
void ls(){
int count=10;
Directory dirs;
fseek(dir,0,0);/*把文件指针放到文件的开头*/
while(count>0){
count=fread(&dirs,sizeof(Directory),1,dir);/*读目录文件*/
if(count>0)
printf("%s\n",dirs.name);
}
}
void cat(char name[])
{
int count=10,begin,length;
char content[100];/*文件的最大长度是100个字符*/
Directory dirs;
fseek(dir,0,0);
while((count>0)&&(strcmp(dirs.name,name)!=0))
{/*查目录*/
count=fread(&dirs,sizeof(Directory),1,dir);
}
if(count==0){
printf("no such file!");
return;
}
else{/*创建该文件*/
begin=dirs.begin;
length=dirs.length;
fseek(file,begin,0);
fread(&content,1,length,file);
content[length]='\0';
printf("%s",content);
printf("\n");
}
}
void create(char name[]){
char content[100];
Directory dirs;
fseek(dir,0,2);/*将文件指针放到文件结束的位置*/
strcpy(dirs.name,name);
fseek(file,0,2);
scanf("%s",&content);
dirs.length=strlen(content);
dirs.begin=ftell(file);
fwrite(&dirs,sizeof(dirs),1,dir);
fwrite(&content,1,dirs.length,file);
}
void rm(char name[]){
}
void main(){
char name[20];
char *tempname;
file=fopen("file.dat","a+");/*打开数据文件*/
dir=fopen("directory.dat","a+");/*打开目录文件*/
char temp[20];
while(strcmp(temp,"exit")!=0){
gets(temp);/*从命令行中读字符串*/
if(strstr(temp,"ls")!=0)
ls();/*列出所有文件*/
else if(strstr(temp,"cat")!=0){
tempname=temp+4;
strcpy(name,tempname);
cat(name);/*读指定文件中的内容*/
}
else if(strstr(temp,"create")){
tempname=temp+7;
strcpy(name,tempname);
create(name);/*创建一个文件*/
}
else if(strstr(temp,"rm")){
tempname=temp+7;
strcpy(name,tempname);
rm(name);/*删除一个文件*/
}
else printf("bad order");
printf("\n");
}
fclose(dir);/*关闭一个文件*/
fclose(file);
}
