auth - Fix

[address@hidden]

Hi,

 

I found a very annoying bug in the authentication feature of grub (grub-core/normal/auth.c). The feature uses the function grub_printf to print backspaces to the screen, but the function fails to remove/override the last printed character and setting the cursor one step back (printing backspace). It simply moves the cursor one step forward, when it reveives a backspace character. Therfore the username entered by user is not displayed correctly, if the user used the backspace key (this problem has no effect on the input buffer; it only affects the display of the user input).
The patch I attached this mail should fix this bug. It manipulates the cursor directly, if the user pressed the backspace key.



auth.patch
Description: Text Data