Linux Cubed Series 7: Sunsite/Linux Cubed Series 7 - Sunsite Vol 1.iso/system/filesyst/ext2/ext2ed-0.000/ext2ed-0/ext2ed-0.1/inodebitmap_com.c

C/C++ Source or Header | 1995-08-24 | 5KB | 215 lines

/*

/usr/src/ext2ed/inodebitmap_com.c

A part of the extended file system 2 disk editor.

-------------------------
Handles the inode bitmap.
-------------------------

Please refer to the documentation in blockbitmap_com.c - Those two files are almost equal.

First written on: July 25 1995

Copyright (C) 1995 Gadi Oxman

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "ext2ed.h"


void type_ext2_inode_bitmap___entry (char *command_line)

{
    unsigned long entry_num;
    char *ptr,buffer [80];

    ptr=parse_word (command_line,buffer);
    if (*ptr==0) {
        wprintw (command_win,"Error - No argument specified\n");refresh_command_win ();return;
    }
    ptr=parse_word (ptr,buffer);

    entry_num=atol (buffer);

    if (entry_num >= file_system_info.super_block.s_inodes_per_group) {
        wprintw (command_win,"Error - Entry number out of bounds\n");refresh_command_win ();return;
    }

    inode_bitmap_info.entry_num=entry_num;
    strcpy (buffer,"show");dispatch (buffer);
}

void type_ext2_inode_bitmap___next (char *command_line)

{
    long entry_offset=1;
    char *ptr,buffer [80];

    ptr=parse_word (command_line,buffer);
    if (*ptr!=0) {
        ptr=parse_word (ptr,buffer);
        entry_offset=atol (buffer);
    }

    sprintf (buffer,"entry %ld",inode_bitmap_info.entry_num+entry_offset);
    dispatch (buffer);
}

void type_ext2_inode_bitmap___prev (char *command_line)

{
    long entry_offset=1;
    char *ptr,buffer [80];

    ptr=parse_word (command_line,buffer);
    if (*ptr!=0) {
        ptr=parse_word (ptr,buffer);
        entry_offset=atol (buffer);
    }

    sprintf (buffer,"entry %ld",inode_bitmap_info.entry_num-entry_offset);
    dispatch (buffer);
}

void type_ext2_inode_bitmap___allocate (char *command_line)

{
    long entry_num,num=1;
    char *ptr,buffer [80];

    ptr=parse_word (command_line,buffer);
    if (*ptr!=0) {
        ptr=parse_word (ptr,buffer);
        num=atol (buffer);
    }

    entry_num=inode_bitmap_info.entry_num;
    if (num > file_system_info.super_block.s_inodes_per_group-entry_num) {
        wprintw (command_win,"Error - There aren't that much inodes in the group\n");
        refresh_command_win ();return;
    }

    while (num) {
        allocate_inode (entry_num);
        num--;entry_num++;
    }

    dispatch ("show");
}

void type_ext2_inode_bitmap___deallocate (char *command_line)

{
    long entry_num,num=1;
    char *ptr,buffer [80];

    ptr=parse_word (command_line,buffer);
    if (*ptr!=0) {
        ptr=parse_word (ptr,buffer);
        num=atol (buffer);
    }

    entry_num=inode_bitmap_info.entry_num;
    if (num > file_system_info.super_block.s_inodes_per_group-entry_num) {
        wprintw (command_win,"Error - There aren't that much inodes in the group\n");
        refresh_command_win ();return;
    }

    while (num) {
        deallocate_inode (entry_num);
        num--;entry_num++;
    }

    dispatch ("show");
}


void allocate_inode (long entry_num)

{
    unsigned char bit_mask=1;
    int byte_offset,j;

    byte_offset=entry_num/8;
    for (j=0;j<entry_num%8;j++)
        bit_mask*=2;
    type_data.u.buffer [byte_offset] |= bit_mask;
}

void deallocate_inode (long entry_num)

{
    unsigned char bit_mask=1;
    int byte_offset,j;

    byte_offset=entry_num/8;
    for (j=0;j<entry_num%8;j++)
        bit_mask*=2;
    bit_mask^=0xff;

    type_data.u.buffer [byte_offset] &= bit_mask;
}

void type_ext2_inode_bitmap___show (char *command_line)

{
    int i,j;
    unsigned char *ptr;
    unsigned long inode_num,entry_num;

    ptr=type_data.u.buffer;
    show_pad_info.line=0;show_pad_info.max_line=-1;

    wmove (show_pad,0,0);
    for (i=0,entry_num=0;i<file_system_info.super_block.s_inodes_per_group/8;i++,ptr++) {
        for (j=1;j<=128;j*=2) {
            if (entry_num==inode_bitmap_info.entry_num) {
                wattrset (show_pad,A_REVERSE);
                show_pad_info.line=show_pad_info.max_line-show_pad_info.display_lines/2;
            }

            if ((*ptr) & j)
                wprintw (show_pad,"1");
            else
                wprintw (show_pad,"0");

            if (entry_num==inode_bitmap_info.entry_num)
                wattrset (show_pad,A_NORMAL);

            entry_num++;
        }
        wprintw (show_pad," ");
        if (i%8==7) {
            wprintw (show_pad,"\n");
            show_pad_info.max_line++;
        }
    }

    if (i%8!=7) {
        wprintw (show_pad,"\n");
        show_pad_info.max_line++;
    }

    refresh_show_pad ();
    show_info ();
    wmove (show_win,1,0);wprintw (show_win,"Inode bitmap of block group %ld\n",inode_bitmap_info.group_num);

    inode_num=1+inode_bitmap_info.entry_num+inode_bitmap_info.group_num*file_system_info.super_block.s_inodes_per_group;
    wprintw (show_win,"Status of inode %ld - ",inode_num);
    ptr=type_data.u.buffer+inode_bitmap_info.entry_num/8;
    j=1;
    for (i=inode_bitmap_info.entry_num % 8;i>0;i--)
        j*=2;
    if ((*ptr) & j)
        wprintw (show_win,"Allocated\n");
    else
        wprintw (show_win,"Free\n");
    refresh_show_win ();
}