diff options
| -rw-r--r-- | lib/vbexport/keyboard.c | 51 |
1 files changed, 33 insertions, 18 deletions
diff --git a/lib/vbexport/keyboard.c b/lib/vbexport/keyboard.c index 03fafad0f6a..b6ccd5adcc9 100644 --- a/lib/vbexport/keyboard.c +++ b/lib/vbexport/keyboard.c @@ -19,27 +19,42 @@ uint32_t VbExKeyboardRead(void) { - int c; + int c = 0; + /* No input available. */ if (!tstc()) - return 0; - - c = getc(); - - /* Special handle for up/down/left/right arrow keys. */ - if (c == CSI_0) { - if (getc() == CSI_1) { - c = getc(); - switch (c) { - case 'A': return VB_KEY_UP; - case 'B': return VB_KEY_DOWN; - case 'C': return VB_KEY_RIGHT; - case 'D': return VB_KEY_LEFT; - } - } - /* Filter out any speical key we don't recognize. */ - return 0; + goto out; + + /* Read a non-Escape character or a standalone Escape character. */ + if ((c = getc()) != CSI_0 || !tstc()) + goto out; + + /* Filter out non- Escape-[ sequence. */ + if (getc() != CSI_1) { + c = 0; + goto out; + } + + /* Special values for arrow up/down/left/right. */ + switch (getc()) { + case 'A': + c = VB_KEY_UP; + break; + case 'B': + c = VB_KEY_DOWN; + break; + case 'C': + c = VB_KEY_RIGHT; + break; + case 'D': + c = VB_KEY_LEFT; + break; + default: + /* Filter out speical keys that we do not recognize. */ + c = 0; + break; } +out: return c; } |