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This change prevents misinterpreting an unknown ESC sequence's

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tail as a garbage input. To reproduce, run "sleep 3" and
hold down Down_Arrow key until sleep runs.
With debugging log enabled, the following can be seen:

entered get_key_code(no_delay:0)
 c=tty_lowlevel_getch()=27
 push_char(27) !0
 c=xgetch_second()=91
 push_char(91) !0
 2 c=tty_lowlevel_getch()=66
 push_char(66)
 seq_buffer[0]:27   <---- the saved Down Arrow sequence "ESC [ B"
 seq_buffer[1]:91
 seq_buffer[2]:66
 seq_buffer[3]:0
pending_keys!=NULL. m=-1
d=*pending_keys++=27
d=ALT(*pending_keys++)=ALT(91)=8283
^^^^^^^^^^^^^^^^^^^^^^^ we misinterpret "ESC [ B" as "ESC ["
return correct_key_code(8283)
entered get_key_code(no_delay:0)
pending_keys!=NULL. m=-1
d=*pending_keys++=66
^^^^^^^^^^^^ we think user pressed "B"
return correct_key_code(66)

With this patch, no bogus "input" is generated.

Longer unknown sequences need an additional fix, coming next.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Slava Zanko <slavazanko@gmail.com>
This commit is contained in:
Denys Vlasenko 2013-05-21 14:47:30 +03:00 committed by Slava Zanko
parent 77cfaf03cb
commit ecd3b62b8e
1 changed files with 7 additions and 2 deletions
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9
lib/tty/key.c
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@ -1747,14 +1747,19 @@ get_key_code (int no_delay)
if (pending_keys != NULL)
{
int d;
gboolean bad_seq;
d = *pending_keys++;
while (d == ESC_CHAR)
d = ALT (*pending_keys++);
if (*pending_keys == '\0')
bad_seq = (*pending_keys != ESC_CHAR && *pending_keys != 0);
if (*pending_keys == '\0' || bad_seq)
pending_keys = seq_append = NULL;
if (bad_seq)
goto nodelay_try_again;
if (d > 127 && d < 256 && use_8th_bit_as_meta)
d = ALT (d & 0x7f);
@ -1835,7 +1840,7 @@ get_key_code (int no_delay)
{
if (c == this->ch)
{
if (!this->child)
if (this->child == NULL)
{
/* We got a complete match, return and reset search */
int code;