From 464df1d5e5ab1322e2dd0a7796939fff1aeefa9a Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 17:49:25 +0200
Subject: Adding upstream version 1.47.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ext2ed/blockbitmap_com.c | 266 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 266 insertions(+)
 create mode 100644 ext2ed/blockbitmap_com.c

(limited to 'ext2ed/blockbitmap_com.c')

diff --git a/ext2ed/blockbitmap_com.c b/ext2ed/blockbitmap_com.c
new file mode 100644
index 0000000..53e61dc
--- /dev/null
+++ b/ext2ed/blockbitmap_com.c
@@ -0,0 +1,266 @@
+/*
+
+/usr/src/ext2ed/blockbitmap_com.c
+
+A part of the extended file system 2 disk editor.
+
+-------------------------
+Handles the block bitmap.
+-------------------------
+
+This file implements the commands which are specific to the blockbitmap type.
+
+First written on: July 5 1995
+
+Copyright (C) 1995 Gadi Oxman
+
+*/
+
+#include "config.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ext2ed.h"
+
+/*
+
+The functions in this file use the flobal structure block_bitmap_info. This structure contains the current
+position in the bitmap.
+
+*/
+
+void type_ext2_block_bitmap___entry (char *command_line)
+
+/*
+
+This function changes the current entry in the bitmap. It just changes the entry_num variable in block_bitmap_info
+and dispatches a show command to show the new entry.
+
+*/
+
+{
+	unsigned long entry_num;
+	char *ptr,buffer [80];
+
+
+
+	ptr=parse_word (command_line,buffer);					/* Get the requested entry */
+	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_blocks_per_group) {	/* Check if it is a valid entry number */
+
+		wprintw (command_win,"Error - Entry number out of bounds\n");
+		refresh_command_win ();return;
+	}
+
+
+
+	block_bitmap_info.entry_num=entry_num;					/* If it is, just change entry_num and */
+	strcpy (buffer,"show");dispatch (buffer);				/* dispatch a show command */
+}
+
+void type_ext2_block_bitmap___next (char *command_line)
+
+/*
+
+This function passes to the next entry in the bitmap. We just call the above entry command.
+
+*/
+
+{
+	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",block_bitmap_info.entry_num+entry_offset);
+	dispatch (buffer);
+}
+
+void type_ext2_block_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",block_bitmap_info.entry_num-entry_offset);
+	dispatch (buffer);
+}
+
+void type_ext2_block_bitmap___allocate (char *command_line)
+
+/*
+
+This function starts allocating block from the current position. Allocating involves setting the correct bits
+in the bitmap. This function is a vector version of allocate_block below - We just run on the blocks that
+we need to allocate, and call allocate_block for each one.
+
+*/
+
+{
+	long entry_num,num=1;
+	char *ptr,buffer [80];
+
+	ptr=parse_word (command_line,buffer);					/* Get the number of blocks to allocate */
+	if (*ptr!=0) {
+		ptr=parse_word (ptr,buffer);
+		num=atol (buffer);
+	}
+
+	entry_num=block_bitmap_info.entry_num;
+										/* Check for limits */
+	if (num > file_system_info.super_block.s_blocks_per_group-entry_num) {
+		wprintw (command_win,"Error - There aren't that much blocks in the group\n");
+		refresh_command_win ();return;
+	}
+
+	while (num) {								/* And call allocate_block */
+		allocate_block (entry_num);					/* for each block */
+		num--;entry_num++;
+	}
+
+	dispatch ("show");							/* Show the result */
+}
+
+void type_ext2_block_bitmap___deallocate (char *command_line)
+
+/* This is the opposite of the above function - We call deallocate_block instead of allocate_block */
+
+{
+	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=block_bitmap_info.entry_num;
+	if (num > file_system_info.super_block.s_blocks_per_group-entry_num) {
+		wprintw (command_win,"Error - There aren't that much blocks in the group\n");
+		refresh_command_win ();return;
+	}
+
+	while (num) {
+		deallocate_block (entry_num);
+		num--;entry_num++;
+	}
+
+	dispatch ("show");
+}
+
+
+void allocate_block (long entry_num)
+
+/* In this function we convert the bit number into the right byte and inner bit positions. */
+
+{
+	unsigned char bit_mask=1;
+	int byte_offset,j;
+
+	byte_offset=entry_num/8;					/* Find the correct byte - entry_num/8 */
+									/* The position inside the byte is entry_num %8 */
+	for (j=0;j<entry_num%8;j++)
+		bit_mask*=2;						/* Generate the or mask - 1 at the right place */
+	type_data.u.buffer [byte_offset] |= bit_mask;			/* And apply it */
+}
+
+void deallocate_block (long entry_num)
+
+/* This is the opposite of allocate_block above. We use an and mask instead of an or mask. */
+
+{
+	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_block_bitmap___show (char *command_line)
+
+/*
+
+We show the bitmap as a series of bits, grouped at 8-bit intervals. We display 8 such groups on each line.
+The current position (as known from block_bitmap_info.entry_num) is highlighted.
+
+*/
+
+{
+	int i,j;
+	unsigned char *ptr;
+	unsigned long block_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_blocks_per_group/8;i++,ptr++) {
+		for (j=1;j<=128;j*=2) {						/* j contains the and bit mask */
+			if (entry_num==block_bitmap_info.entry_num) {		/* Highlight the current entry */
+				wattrset (show_pad,A_REVERSE);
+				show_pad_info.line=show_pad_info.max_line-show_pad_info.display_lines/2;
+			}
+
+			if ((*ptr) & j)						/* Apply the mask */
+				wprintw (show_pad,"1");
+			else
+				wprintw (show_pad,"0");
+
+			if (entry_num==block_bitmap_info.entry_num)
+				wattrset (show_pad,A_NORMAL);
+
+			entry_num++;						/* Pass to the next entry */
+		}
+		wprintw (show_pad," ");
+		if (i%8==7) {							/* Display 8 groups in a row */
+			wprintw (show_pad,"\n");
+			show_pad_info.max_line++;
+		}
+	}
+
+	refresh_show_pad ();
+	show_info ();								/* Show the usual information */
+
+										/* Show the group number */
+	wmove (show_win,1,0);
+	wprintw (show_win,"Block bitmap of block group %ld\n",block_bitmap_info.group_num);
+										/* Show the block number */
+
+	block_num=block_bitmap_info.entry_num+block_bitmap_info.group_num*file_system_info.super_block.s_blocks_per_group;
+	block_num+=file_system_info.super_block.s_first_data_block;
+
+	wprintw (show_win,"Status of block %ld - ",block_num);			/* and the allocation status */
+	ptr=type_data.u.buffer+block_bitmap_info.entry_num/8;
+	j=1;
+	for (i=block_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 ();
+}
-- 
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