[Bug-ddrescue] [patch] [proposal] debug_printf and debug print macros

[Alexander Sashnov]

Hello to developers of GNU ddrescue.

I've just wondered how you manage to debug this software without any 
debug printf or something like this.

Feel free to test, use and include to the upstream the patch from the 
attachment.


How to apply this patch (tested on Ubuntu 13.04 x32):

# Ubuntu-specific: lzip installation:
$ sudo apt-get instal debian-keyring
$ sudo apt-get install lzip

$ cd ~/tmp
$ wget 
http://download.savannah.gnu.org/releases/ddrescue/ddrescue-1.17-rc4.tar.lz
$ tar xf ddrescue-1.17-rc4.tar.lz
$ cd ddrescue-1.17-rc4/
$ patch -p1 < ~/Downloads/debug_printf_for_ddrescue.patch
$ ./configure
$ make


How to use it:

$ DEBUG_OUTPUT_FILENAME=debug_output.log ./ddrescue 
/dev/mapper/disk_with_bad_blocks destination.img logfile.log

debug_output.log will be created in current dir.





PS.   Here is logfile.log and debug_output.log in the attachment
 for  640 sectors device with bad blocks:

$ sudo dmsetup table /dev/mapper/disk_with_bad_blocks
0 280 linear 7:4 0
280 72 error
352 288 linear 7:4 352

This particular debug printf log file may also be enteresting
(I've seen subject "10K/s on badblocks" in this list).

--
Best regards,
Alexander Sashnov.

debug_printf_for_ddrescue.patch
Description: Text Data

debug_output.log
Description: Text Data

logfile.log
Description: Text Data