int main(int argc,char *argv[]){
int ch;
int ret;
while((ch=getopt(argc,argv,"fhrvwx"))!= EOF){
switch(ch){
case 'f':
ret = myaccess(argv[1],F_OK);
if(0==ret) {
printf("file exist\n");
} else {
printf("file not exist\n");
}
break;
case 'r':
ret = myaccess(argv[1],R_OK);
if(0==ret) {
printf("file readed\n");
} else {
printf("file not readed\n");
}
break;
case 'w':
ret = myaccess(argv[1],W_OK);
if(0==ret) {
printf("file write\n");
} else {
printf("file not write\n");
}
break;
case 'x':
ret = myaccess(argv[1],X_OK);
if(0==ret) {
printf("file execute\n");
} else {
printf("file not execute\n");
}
break;
case 'h':
usage(argv[0]);
break;
case 'v':
printf("%s VERSION:%s",argv[0],VERSION);
exit(0);
break;
default:
usage(argv[0]);
break;
}
}
if(argc <= 2){
usage(argv[0]);
}
return 0;
}
int Enterdir(char* namestr)//进入目录
{
int i;
i=Fd_dirfile(namestr);
if(i!=-1)
{
read_inode(i);
if((inodetemp->di_mode&DIMODE_DIR)!=DIMODE_DIR)
{
printf("%s 不是目录!\n",namestr);
return -1;
}
if(!myaccess())
{
printf("您没有权限!\n");
return -1;
}
changeinode();
}
else
{
printf("未找到该文件!请输入正确的文件或目录名\n");
return -1;
}
read_dir_data(cur_inode->di_block[0]);
return 1;
}
char*
findApp( const char* fn )
/* purpose: check the executable filename and correct it if necessary
* paramtr: fn (IN): current knowledge of filename
* returns: newly allocated fqpn of path to exectuble, or NULL if not found
*/
{
char* s, *path, *t = NULL;
/* sanity check */
if ( fn == NULL || *fn == '\0' ) return NULL;
/* don't touch absolute paths */
if ( *fn == '/' ) {
if ( myaccess(fn) == 0 ) return strdup(fn);
else return NULL;
}
/* try from CWD */
if ( myaccess(fn) == 0 ) return strdup(fn);
/* continue only if there is a PATH to check */
if ( (s=getenv("PATH")) == NULL ) return NULL;
else path = strdup(s);
/* tokenize to compare */
for ( s=strtok(path,":"); s; s=strtok(NULL,":") ) {
size_t len = strlen(fn) + strlen(s) + 2;
t = (char*) malloc(len);
strncpy( t, s, len );
strncat( t, "/", len );
strncat( t, fn, len );
if ( myaccess(t) == 0 ) break;
else {
free((void*) t);
t = NULL;
}
}
/* some or no matches found */
free((void*) path);
return t;
}
char* ReadFile(char strname[14])
{
int fi;
fi=Fd_dirfile(strname);//查找该文件夹下是否有文件
if(fi!=-1)
{
// printf("已找到 %s 文件\n",strname);
}
else
{
printf("找不到到 %s 文件\n",strname);
return NULL;
}
inodetemp=read_inode(fi);
if(!myaccess())
{
printf("您没有权限!\n");
return NULL;
}
if(inodetemp==NULL)
{
return NULL;
}
if((inodetemp->di_mode&DIMODE_FILE)!=DIMODE_FILE)
{
printf("%s不是一个文件!\n",strname);
return NULL;
}
char *buf;
buf = (char *)malloc(BLOCKSIZ*(inodetemp->di_size/BLOCKSIZ+1));
fseek(fd, DATASTART+BLOCKSIZ*inodetemp->di_block[0], SEEK_SET);
fread (buf, BLOCKSIZ*(inodetemp->di_size/BLOCKSIZ+1),1,fd);
return buf;
}
int mywrite(char strname[])//编辑文件
{
int fi,i,k;
char *buf;
char *buf1;
fi=Fd_dirfile(strname);//查找该文件夹下是否有文件
if(fi==-1)
{
printf("该文件夹下没有 %s 文件或文件夹\n",strname);
return 0;
}
inodetemp=read_inode(fi);
if(!myaccess())
{
printf("您没有权限!\n");
return NULL;
}
buf=(char *)malloc((inodetemp->di_size/BLOCKSIZ+1)*BLOCKSIZ);
buf1=(char *)malloc(BLOCKSIZ);
buf=ReadFile(strname);
if(buf==NULL)
{
printf("文件读取失败!\n");
return 0;
}
char c;
printf("是否真的要写覆盖 %s ?<y/n>",strname);
fgetc(stdin);
scanf("%c",&c);
if(c!='y')
{
return 0;
}
i =0;
k=0;
printf("原来文件的内容%s\n",buf);
printf("输入新文件内容，以\"###\"结束:\n");
fgetc(stdin);
while(k!=3)
{
buf1[i] = getchar();
if(buf1[i] == '#')
{
k++;
if(k == 3)
break;
}
else
k=0;
i++;
if(i/BLOCKSIZ > 0)
{
buf1 = (char *)realloc(buf1,BLOCKSIZ*(i/BLOCKSIZ+1));
}
}
buf1[i-2]='\0';
inodetemp->di_size=strlen(buf1);
fseek(fd,DINODESTART+BLOCKSIZ*inodetemp->di_ino, SEEK_SET);//将新建的文件写入硬盘inode区
fwrite(inodetemp,BLOCKSIZ, 1, fd);
fseek(fd, DATASTART+BLOCKSIZ*inodetemp->di_block[0], SEEK_SET);
fwrite (buf1, BLOCKSIZ*(inodetemp->di_size/BLOCKSIZ+1),1,fd);
return 1;
}
int deletefd(char strname[20])
{
int fi,i;
fi=Fd_dirfile(strname);//查找该文件夹下是否有文件
if(fi==-1)
{
printf("该文件夹下没有 %s 文件或文件夹\n",strname);
return 0;
}
inodetemp=read_inode(fi);
if((inodetemp->di_mode&DIMODE_SYSTEM)==DIMODE_SYSTEM)
{
printf("%s是系统文件，无法删除\n",strname);
return 0;
}else if((inodetemp->di_mode&DIMODE_FILE)==DIMODE_FILE)//如果是文件 则直接删除
{
}
else if((inodetemp->di_mode&DIMODE_DIR)==DIMODE_DIR)
{
if(inodetemp->di_number>2)
{
printf("该目录下还有文件，不能删除此文件夹!\n");
return 0;
}
}
if(!myaccess())
{
printf("您没有权限!\n");
return -1;
}
char c;
printf("是否真的要删除 %s ?<y/n>",strname);
fgetc(stdin);
scanf("%c",&c);
if(c!='y')
{
return 0;
}
i=0;
while(strcmp(dir_buf[i].d_name,strname)!=0)
{
i++;
}
for(;i<cur_inode->di_number;i++)
{
strcpy(dir_buf[i].d_name,dir_buf[i+1].d_name);
dir_buf[i].d_ino=dir_buf[i+1].d_ino;
}
cur_inode->di_number--;
fseek(fd,DATASTART+BLOCKSIZ*cur_inode->di_block[0], SEEK_SET);//更新当前目录block
fwrite(dir_buf,BLOCKSIZ, 1, fd);
fseek(fd,DINODESTART+BLOCKSIZ*cur_inode->di_ino, SEEK_SET);//更新当前目录inode
fwrite(cur_inode,BLOCKSIZ, 1, fd);
for(i=0;i<(int)(inodetemp->di_size/BLOCKSIZ+1);i++)
{
bk_bitmap[inodetemp->di_block[i]]=0;
}
di_bitmap[inodetemp->di_ino]=0;
filsys.s_free_blocks_count++;
filsys.s_free_blocks_group[inodetemp->di_block[0]/GROUPNUM]++;
filsys.s_free_inodes_count++;
fseek(fd, BLOCKSIZ, SEEK_SET);//修改超级块 free block计数 free inode计数 和每组free block 计数
fwrite (&filsys,BLOCKSIZ, 1,fd);
fseek(fd, BLOCKSIZ*2, SEEK_SET);//在硬盘修改inode位图
fwrite (di_bitmap,BLOCKSIZ, 1,fd);
fseek(fd, BLOCKSIZ*3, SEEK_SET);//在硬盘修改block位图
fwrite (bk_bitmap,BLOCKSIZ, 1,fd);
return 1;
}
