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Handle Alt+Numpad key sequences in console input and select

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{p}select/{p}poll completely ignored Alt+Numpad key sequences in console
input which results in newer readline using pselect to fail handling such
sequences correctly.  See https://cygwin.com/ml/cygwin/2017-01/msg00135.html

During debugging and testing it turned out that while reading console
input, single key presses during an Alt+Numpad sequences where not
ignored, so ultimately a sequence like

  Alt-down Numpad-1 Numpad-2 Numpad-3

whihc is supposed to result in a single character in the input stream
will actually result in 4 chars in the input stream, three control
sequences and the actual character.

Both problems should be fixed by this patch.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2017-01-19 18:59:48 +01:00
parent 96267313e1
commit 4652cc4384
2 changed files with 35 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
winsup/cygwin/fhandler_console.cc
View File

@ -7,6 +7,7 @@ Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */ details. */
#include "winsup.h" #include "winsup.h"
#include <dinput.h>
#include "miscfuncs.h" #include "miscfuncs.h"
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -415,6 +416,17 @@ fhandler_console::read (void *pv, size_t& buflen)
// left alt -- see http://www.microsoft.com/hwdev/tech/input/Scancode.asp // left alt -- see http://www.microsoft.com/hwdev/tech/input/Scancode.asp
&& input_rec.Event.KeyEvent.wVirtualScanCode == 0x38)) && input_rec.Event.KeyEvent.wVirtualScanCode == 0x38))
continue; continue;
/* Ignore Alt+Numpad keys. These are used to enter codepoints not
available in the current keyboard layout. They are eventually
handled in the key-up case below. For details see
http://www.fileformat.info/tip/microsoft/enter_unicode.htm */
if (input_rec.Event.KeyEvent.bKeyDown
&& wch == 0
&& input_rec.Event.KeyEvent.dwControlKeyState == LEFT_ALT_PRESSED
&& input_rec.Event.KeyEvent.wVirtualScanCode >= DIK_NUMPAD7
&& input_rec.Event.KeyEvent.wVirtualScanCode <= DIK_NUMPAD0
&& input_rec.Event.KeyEvent.wVirtualScanCode != DIK_SUBTRACT)
continue;
if (control_key_state & SHIFT_PRESSED) if (control_key_state & SHIFT_PRESSED)
con.nModifiers |= 1; con.nModifiers |= 1;

26
winsup/cygwin/select.cc
View File

@ -12,6 +12,7 @@ details. */
#define __INSIDE_CYGWIN_NET__ #define __INSIDE_CYGWIN_NET__
#include "winsup.h" #include "winsup.h"
#include <dinput.h>
#include <stdlib.h> #include <stdlib.h>
#include <sys/param.h> #include <sys/param.h>
#include "ntdll.h" #include "ntdll.h"
@ -893,9 +894,28 @@ peek_console (select_record *me, bool)
fh->send_winch_maybe (); fh->send_winch_maybe ();
if (irec.EventType == KEY_EVENT) if (irec.EventType == KEY_EVENT)
{ {
if (irec.Event.KeyEvent.bKeyDown if (irec.Event.KeyEvent.bKeyDown)
&& (irec.Event.KeyEvent.uChar.AsciiChar {
|| fhandler_console::get_nonascii_key (irec, tmpbuf))) /* Ignore Alt+Numpad keys. These are used to enter codepoints
not available in the current keyboard layout. They are
eventually handled in the key-up case below. For details see
http://www.fileformat.info/tip/microsoft/enter_unicode.htm */
if (irec.Event.KeyEvent.uChar.UnicodeChar == 0
&& irec.Event.KeyEvent.dwControlKeyState == LEFT_ALT_PRESSED
&& irec.Event.KeyEvent.wVirtualScanCode >= DIK_NUMPAD7
&& irec.Event.KeyEvent.wVirtualScanCode <= DIK_NUMPAD0
&& irec.Event.KeyEvent.wVirtualScanCode != DIK_SUBTRACT)
;
/* Handle normal input. */
else if (irec.Event.KeyEvent.uChar.UnicodeChar
|| fhandler_console::get_nonascii_key (irec, tmpbuf))
return me->read_ready = true;
}
/* Ignore key up events, except for left alt events with
non-zero character */
else if (irec.Event.KeyEvent.uChar.UnicodeChar != 0
&& irec.Event.KeyEvent.wVirtualKeyCode == VK_MENU
&& irec.Event.KeyEvent.wVirtualScanCode == 0x38)
return me->read_ready = true; return me->read_ready = true;
} }
else else