Bugs of Esc[nE and Esc[nF

[viruscamp]

From dvdhrm#142

When I am using pacman , I found:
Error output in kmscon:

[]$ sudo pacman -Sy
:: Synchronizing package databases…
 core
 extra
 core is up to date extra is up to date[]$

Correct output in getty, xterm, qterminal, konsole, etc

[]$ sudo pacman -Sy
:: Synchronizing package databases...
 core is up to date
 extra is up to date
[]$ 

I wrote a sample code to simulate it, and got the same outputs:

#include <stdio.h>
#include <unistd.h>

// from pacman-6.0.1/src/pacman/util.c: 1835
/* Moves console cursor `lines` up */
void console_cursor_move_up(unsigned int lines)
{
    printf("\x1B[%dF", lines);
}

/* Moves console cursor `lines` down */
void console_cursor_move_down(unsigned int lines)
{
    printf("\x1B[%dE", lines);
}

/* Erases line from the current cursor position till the end of the line */
void console_erase_line(void)
{
    printf("\x1B[K");
}

int main()
{
    printf(":: Synchronizing package databases...\n");
    printf(" %s\n", "core");
    printf(" %s\n", "extra");
    sleep(1);
    
    console_cursor_move_up(2);
    printf(" %s is up to date", "core");
    console_erase_line();
    
    console_cursor_move_down(1);
    printf(" %s is up to date", "extra");
    console_erase_line();
    
    printf("\n");

    return 0;
}

[viruscamp]

That's a shell script which do the same:

echo -e ":: Synchronizing package databases..."
echo -e "core"
echo -e "extra"

sleep 1
echo -ne "\E[2F"
echo -ne " core is up to date"
echo -ne "\E[K"

sleep 1
echo -ne "\E[1E"
echo -ne " extra is up to date"
echo -ne "\E[K"

echo

[viruscamp]

I have tested in wlterm which also use libtsm as kmscon, and found the same bug.

So, it should be the bug of libtsm.

[viruscamp]

According to https://www.man7.org/linux/man-pages/man4/console_codes.4.html , 'ECMA-48 CSI sequences' parts, the do_csi function in https://github.com/Aetf/libtsm/blob/check-null/src/tsm/tsm-vte.c#L1749C16-L1749C16 lacks

       E   CNL       Move cursor down the indicated # of rows, to column 1.
       F   CPL       Move cursor up the indicated # of rows, to column 1.