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cli: Consume invalid escape sequences early

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Unexpected 'Esc' key presses are accumulated internally, even if it is
already clear that the current escape sequence is invalid. This results
in weird behaviour. For example, the next character after 'Esc' key
simply disappears from input and 'Unknown command' is printed
after 'Enter'.

This commit fixes some issues with extra 'Esc' keys entered by user:

1. Sequence <Esc><Esc><Enter> right after autoboot stop gives:
=>
nknown command 'ry 'help'
=>
2. Sequence <Esc><p><r><i><Enter> gives:
=> ri
Unknown command 'ri' - try 'help'
=>
3. Extra 'Esc' key presses break backspace functionality.

Signed-off-by: Yurii Monakov <monakov.y@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Yurii Monakov 2023-10-10 11:16:39 +03:00 • committed by Tom Rini
parent 5cab3515f8
commit 2dd86b9075
2 changed files with 14 additions and 0 deletions
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2
common/cli_getch.c
View file

@ -46,6 +46,8 @@ static int cli_ch_esc(struct cli_ch_state *cch, int ichar,
case 1:
if (ichar == '[' || ichar == 'O')
act = ESC_SAVE;
else
act = ESC_CONVERTED;
break;
case 2:
switch (ichar) {

12
test/common/cread.c
View file

@ -43,6 +43,12 @@ static int cli_ch_test(struct unit_test_state *uts)
ut_asserteq('a', cli_ch_process(cch, 'a'));
ut_asserteq(0, cli_ch_process(cch, 0));
/* unexpected 'Esc' */
ut_asserteq('a', cli_ch_process(cch, 'a'));
ut_asserteq(0, cli_ch_process(cch, '\e'));
ut_asserteq('b', cli_ch_process(cch, 'b'));
ut_asserteq(0, cli_ch_process(cch, 0));
return 0;
}
COMMON_TEST(cli_ch_test, 0);
@ -80,6 +86,12 @@ static int cread_test(struct unit_test_state *uts)
ut_asserteq(7, cli_readline_into_buffer("-> ", buf, 1));
ut_asserteq_str("abc\e[Xx", buf);
/* unexpected 'Esc' */
*buf = '\0';
ut_asserteq(7, console_in_puts("abc\eXx\n"));
ut_asserteq(5, cli_readline_into_buffer("-> ", buf, 1));
ut_asserteq_str("abcXx", buf);
/* check timeout, should be between 1000 and 1050ms */
start = get_timer(0);
*buf = '\0';