1/*
2
3/usr/src/ext2ed/ext2_com.c
4
5A part of the extended file system 2 disk editor.
6
7--------------------------------------
8Extended-2 filesystem General commands
9--------------------------------------
10
11The commands here will be registered when we are editing an ext2 filesystem
12
13First written on: July 28 1995
14
15Copyright (C) 1995 Gadi Oxman
16
17*/
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22
23#include "ext2ed.h"
24
25void type_ext2___super (char *command_line)
26
27/*
28
29We are moving to the superblock - Just use setoffset and settype. The offset was gathered in the
30initialization phase (but is constant - 1024).
31
32*/
33
34{
35	char buffer [80];
36
37	super_info.copy_num=0;
38	sprintf (buffer,"setoffset %ld",file_system_info.super_block_offset);dispatch (buffer);
39	sprintf (buffer,"settype ext2_super_block");dispatch (buffer);
40}
41
42void type_ext2___cd (char *command_line)
43
44/*
45
46A global cd command - The path should start with /.
47
48We implement it through dispatching to our primitive functions.
49
50*/
51
52{
53	char temp [80],buffer [80],*ptr;
54
55	ptr=parse_word (command_line,buffer);
56	if (*ptr==0) {
57		wprintw (command_win,"Error - No argument specified\n");refresh_command_win ();return;
58	}
59	ptr=parse_word (ptr,buffer);
60
61	if (buffer [0] != '/') {
62		wprintw (command_win,"Error - Use a full pathname (begin with '/')\n");refresh_command_win ();return;
63	}
64
65	/* Note the various dispatches below - They should be intuitive if you know the ext2 filesystem structure */
66
67	dispatch ("super");dispatch ("group");dispatch ("inode");dispatch ("next");dispatch ("dir");
68	if (buffer [1] != 0) {
69		sprintf (temp,"cd %s",buffer+1);dispatch (temp);
70	}
71}
72
73void type_ext2___group (char *command_line)
74
75/*
76
77We go to the group descriptors.
78First, we go to the first group descriptor in the main copy.
79Then, we use the group's entry command to pass to another group.
80
81*/
82
83{
84	long group_num=0;
85	char *ptr,buffer [80];
86
87	ptr=parse_word (command_line,buffer);
88	if (*ptr!=0) {
89		ptr=parse_word (ptr,buffer);
90		group_num=atol (buffer);
91	}
92
93	group_info.copy_num=0;group_info.group_num=0;
94	sprintf (buffer,"setoffset %ld",file_system_info.first_group_desc_offset);dispatch (buffer);
95	sprintf (buffer,"settype ext2_group_desc");dispatch (buffer);
96	sprintf (buffer,"entry %ld",group_num);dispatch (buffer);
97}
98