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

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Message-Id: <20190325151647.11581-1-changbin.du@gmail.com>
Date:   Mon, 25 Mar 2019 15:16:47 +0000
From:   Changbin Du <changbin.du@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     sam@...nborg.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...il.com>
Subject: [PATCH] kconfig/[mn]conf: handle backspace (^H) key

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. 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