linux-kernel - Re: [PATCH] kconfig/[mn]conf: handle backspace (^H) key

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Date:   Fri, 29 Mar 2019 22:50:04 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kconfig/[mn]conf: handle backspace (^H) key

On Fri, Mar 29, 2019 at 5:16 PM Changbin Du <changbin.du@...il.com> wrote:
>
> On Fri, Mar 29, 2019 at 04:50:18PM +0900, Masahiro Yamada wrote:
> > On Tue, Mar 26, 2019 at 12:16 AM Changbin Du <changbin.du@...il.com> wrote:
> > >
> > > Backspace is not working on some terminal emulators which do not send the
> > > key code defined by terminfo. Terminals either send '^H' (8) or '^?' (127).
> > > But currently only '$?' is handled.
> >
> >
> >
> > Shall I fix '$?' to '^?'
> > if it is a typo?
> >
> yes, please. It is a typo, sorry.
>

Fixed the typo,
and applied to linux-kbuild/fixes. Thanks.



> >
> >
> >
> > > Let's also handle '^H' for those
> > > terminals.
> > >
> > > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > > ---
> > >  scripts/kconfig/lxdialog/inputbox.c | 3 ++-
> > >  scripts/kconfig/nconf.c             | 2 +-
> > >  scripts/kconfig/nconf.gui.c         | 3 ++-
> > >  3 files changed, 5 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/scripts/kconfig/lxdialog/inputbox.c b/scripts/kconfig/lxdialog/inputbox.c
> > > index 611945611bf8..1dcfb288ee63 100644
> > > --- a/scripts/kconfig/lxdialog/inputbox.c
> > > +++ b/scripts/kconfig/lxdialog/inputbox.c
> > > @@ -113,7 +113,8 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
> > >                         case KEY_DOWN:
> > >                                 break;
> > >                         case KEY_BACKSPACE:
> > > -                       case 127:
> > > +                       case 8:   /* ^H */
> > > +                       case 127: /* ^? */
> > >                                 if (pos) {
> > >                                         wattrset(dialog, dlg.inputbox.atr);
> > >                                         if (input_x == 0) {
> > > diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
> > > index a4670f4e825a..ac92c0ded6c5 100644
> > > --- a/scripts/kconfig/nconf.c
> > > +++ b/scripts/kconfig/nconf.c
> > > @@ -1048,7 +1048,7 @@ static int do_match(int key, struct match_state *state, int *ans)
> > >                 state->match_direction = FIND_NEXT_MATCH_UP;
> > >                 *ans = get_mext_match(state->pattern,
> > >                                 state->match_direction);
> > > -       } else if (key == KEY_BACKSPACE || key == 127) {
> > > +       } else if (key == KEY_BACKSPACE || key == 8 || key == 127) {
> > >                 state->pattern[strlen(state->pattern)-1] = '\0';
> > >                 adj_match_dir(&state->match_direction);
> > >         } else
> > > diff --git a/scripts/kconfig/nconf.gui.c b/scripts/kconfig/nconf.gui.c
> > > index 7be620a1fcdb..77f525a8617c 100644
> > > --- a/scripts/kconfig/nconf.gui.c
> > > +++ b/scripts/kconfig/nconf.gui.c
> > > @@ -439,7 +439,8 @@ int dialog_inputbox(WINDOW *main_window,
> > >                 case KEY_F(F_EXIT):
> > >                 case KEY_F(F_BACK):
> > >                         break;
> > > -               case 127:
> > > +               case 8:   /* ^H */
> > > +               case 127: /* ^? */
> > >                 case KEY_BACKSPACE:
> > >                         if (cursor_position > 0) {
> > >                                 memmove(&result[cursor_position-1],
> > > --
> > > 2.17.1
> > >
> >
> >
> > --
> > Best Regards
> > Masahiro Yamada
>
> --
> Cheers,
> Changbin Du



-- 
Best Regards
Masahiro Yamada