110 lines
4.3 KiB
C++
110 lines
4.3 KiB
C++
/***********************************************************
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Directory owns treeNode and FileNode structure, detect S_IFDIR to make treeNode or not (see add_entry Function)
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File owns FileNode structure only, detect !S_IFDIR
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*/
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#include <stdio.h>
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#include <string>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "fs.h"
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#include "direntry.h"
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int main() {
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//Init fake root directory
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INode inode_root;
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u_int64_t file_permissions = 0;
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inode_root.permissions = file_permissions | S_IFDIR;
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TreeNode *root = fischl_init_entry(0, "/", &inode_root);//0 is inode number assigned by inode_allocate()
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//add file or dir under fake root
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INode inode_file1;
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fischl_add_entry(root, 2, "file1",&inode_file1);
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//I will put this function in create_new_inode function, there will inode number(2) when inode_allocate
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INode inode_dir1;
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//permission is necessary there to create treeNode or not
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file_permissions = 0;
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inode_dir1.permissions = file_permissions | S_IFDIR;
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fischl_add_entry(root, 3, "dir1",&inode_dir1);
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//find dir file (from root directory view, root contains dir1/ subdirectory)
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FileNode *get_dir1 = fischl_find_entry(root,"/dir1/");
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if(get_dir1 == NULL){
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printf("No dir1 under %s\n",root->dirName);
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freeTree(root);
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return -1;
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}else{
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fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
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printf(" %s under %s\n",get_dir1->name,root->dirName);
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}
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//add file2 under dir1
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INode inode_file2;
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if(get_dir1->subdirectory != NULL){
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//Treenode dir(you cannot find here), you only can get Filenode dir based on fischl_find_entry Function
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//So use Filenode->subdirectory will point to the treenode dir, then can add files
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fischl_add_entry(get_dir1->subdirectory, 4, "file2",&inode_file2);
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printf("add file2 in dir1\n");
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}
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/**********************************************************/
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//This is for debugging, and demonstate to you
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TreeNode *get_dir1_tree = find_parentPath(root,"/dir1/file2");
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if(get_dir1_tree == get_dir1->subdirectory){
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fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
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printf(" [Treenode]get_dir1_tree->dirName (%s) same [Filenode]get_dir1->name (%s)\n",get_dir1_tree->dirName,get_dir1->name);
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}else{
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printf("not same\n");
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}
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/**********************************************************/
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//two Ways to get File(include dir itself) information
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FileNode *get_file2 =NULL;
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//1. absolute path, the root(treeNode) will always exist when initialize
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get_file2 = fischl_find_entry(root,"/dir1/file2");
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if(get_file2 == NULL){
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printf("No dir1 under dir1\n");
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freeTree(root);
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return -1;
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}else{
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fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
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printf(" %s under %sdir1/\n",get_file2->name,root->dirName);
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}
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//2. relative path, the get_dir1(FileNode)->subdirectory(treeNode), use treeNode(dir) to find
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get_file2 = fischl_find_entry(get_dir1->subdirectory,"/file2");
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if(get_file2 == NULL){
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printf("No dir1 under %s\n",get_dir1->subdirectory->dirName);
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freeTree(root);
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return -1;
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}else{
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fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
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printf(" %s under %s\n",get_file2->name,get_dir1->subdirectory->dirName);
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}
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/**********************************************************/
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//add one more file under dir1
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INode inode_file3;
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if(get_dir1->subdirectory != NULL){
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fischl_add_entry(get_dir1_tree, 5, "file3",&inode_file3);
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printf("add file3 in dir1\n");
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}
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FileNode *get_file3 =NULL;
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//fischl_find_entry(get_dir1->subdirectory,"/file3"); are equivalent
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get_file3 = fischl_find_entry(get_dir1_tree,"/file3");
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if(get_file3 == NULL){
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printf("No dir1 under %s\n",get_dir1_tree->dirName);
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freeTree(root);
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return -1;
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}else{
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printf(" %s under %s\n",get_file3->name,get_dir1_tree->dirName);
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}
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FileNode *get_file1 = NULL;//under root
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//use .. to find
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get_file1 = fischl_find_entry(get_dir1_tree,"../file1");
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if(get_file1 == NULL){
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printf("No file1\n");
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freeTree(root);
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return -1;
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}else{
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printf(" %s under root(..)\n",get_file1->name);
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}
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// Cleanup
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freeTree(root);
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return 0;
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} |