Add scancode reading capability to TTY

drivers/tty/keyboard.c

@@ -591,14 +591,14 @@ int try;
 	if (ch <= 0xFF) {
 		/* A normal character. */
 		buf[0] = ch;
-		(void) in_process(tp, buf, 1);
+		(void) in_process(tp, buf, 1, scode);
 	} else
 	if (HOME <= ch && ch <= INSRT) {
 		/* An ASCII escape sequence generated by the numeric pad. */
 		buf[0] = ESC;
 		buf[1] = '[';
 		buf[2] = numpad_map[ch - HOME];
-		(void) in_process(tp, buf, 3);
+		(void) in_process(tp, buf, 3, scode);
 	} else
 	if ((F1 <= ch && ch <= F12) || (SF1 <= ch && ch <= SF12) ||
 				(CF1 <= ch && ch <= CF12 && !debug_fkeys)) {
@@ -626,7 +626,7 @@ int try;
 			*p++ = suffix;
 		}
 		*p++ = '~';
-		(void) in_process(tp, buf, p - buf);
+		(void) in_process(tp, buf, p - buf, scode);
 	} else
 	if (ch == ALEFT) {
 		/* Choose lower numbered console as current console. */
@@ -651,6 +651,9 @@ int try;
   		case CF8: sigchar(&tty_table[CONSOLE], SIGINT, 1); break;
   		case CF9: sigchar(&tty_table[CONSOLE], SIGKILL, 1); break;
   	    }
+	} else {
+		/* pass on scancode even though there is no character code */
+		(void) in_process(tp, NULL, 0, scode);
 	}
   }
 

drivers/tty/pty.c

@@ -417,7 +417,7 @@ PRIVATE int pty_read(tty_t *tp, int try)
 	}
 
 	/* Input processing. */
-	if (in_process(tp, &c, 1) == 0) break;
+	if (in_process(tp, &c, 1, -1) == 0) break;
 
 	/* PTY writer bookkeeping. */
 	pp->wrcum++;

drivers/tty/rs232.c

@@ -619,7 +619,7 @@ PRIVATE int rs_read(tty_t *tp, int try)
 	if (count > icount) count = icount;
 
 	/* Perform input processing on (part of) the input buffer. */
-	if ((count = in_process(tp, rs->itail, count)) == 0) break;
+	if ((count = in_process(tp, rs->itail, count, -1)) == 0) break;
 
 	lock();			/* protect interrupt sensitive variables */
 	rs->icount -= count;

drivers/tty/tty.c

@@ -1036,10 +1036,26 @@ register tty_t *tp;		/* pointer to terminal to read from */
 /*===========================================================================*
  *				in_process				     *
  *===========================================================================*/
-PUBLIC int in_process(tp, buf, count)
+PRIVATE void in_process_send_byte(tp, ch)
+tty_t *tp;	/* terminal on which character has arrived */
+int ch;		/* input character */
+{
+	/* Save the character in the input queue. */
+	*tp->tty_inhead++ = ch;
+	if (tp->tty_inhead == bufend(tp->tty_inbuf))
+		tp->tty_inhead = tp->tty_inbuf;
+	tp->tty_incount++;
+	if (ch & IN_EOT) tp->tty_eotct++;
+
+	/* Try to finish input if the queue threatens to overflow. */
+	if (tp->tty_incount == buflen(tp->tty_inbuf)) in_transfer(tp);
+}
+ 
+PUBLIC int in_process(tp, buf, count, scode)
 register tty_t *tp;		/* terminal on which character has arrived */
 char *buf;			/* buffer with input characters */
 int count;			/* number of input characters */
+int scode;			/* scan code */
 {
 /* Characters have just been typed in.  Process, save, and echo them.  Return
  * the number of characters processed.
@@ -1048,6 +1064,11 @@ int count;			/* number of input characters */
   int ch, sig, ct;
   int timeset = FALSE;
 
+  /* Send scancode if requested */
+  if (tp->tty_termios.c_iflag & SCANCODES) {
+	in_process_send_byte(tp, (scode & BYTE) | IN_EOT);
+  }
+
   for (ct = 0; ct < count; ct++) {
 	/* Take one character. */
 	ch = *buf++ & BYTE;
@@ -1180,15 +1201,10 @@ int count;			/* number of input characters */
 	/* Perform the intricate function of echoing. */
 	if (tp->tty_termios.c_lflag & (ECHO|ECHONL)) ch = tty_echo(tp, ch);
 
-	/* Save the character in the input queue. */
-	*tp->tty_inhead++ = ch;
-	if (tp->tty_inhead == bufend(tp->tty_inbuf))
-		tp->tty_inhead = tp->tty_inbuf;
-	tp->tty_incount++;
-	if (ch & IN_EOT) tp->tty_eotct++;
-
-	/* Try to finish input if the queue threatens to overflow. */
-	if (tp->tty_incount == buflen(tp->tty_inbuf)) in_transfer(tp);
+	/* Send processed byte of input unless scancodes sent instead */
+	if (!(tp->tty_termios.c_iflag & SCANCODES)) {
+		in_process_send_byte(tp, ch);
+	}
   }
   return ct;
 }
@@ -1502,6 +1518,9 @@ tty_t *tp;
   /* Setting the output speed to zero hangs up the phone. */
   if (tp->tty_termios.c_ospeed == B0) sigchar(tp, SIGHUP, 1);
 
+  /* SCANCODES is supported only for the console */
+  if (!isconsole(tp)) tp->tty_termios.c_iflag &= ~SCANCODES;
+
   /* Set new line speed, character size, etc at the device level. */
   (*tp->tty_ioctl)(tp, 0);
 }

drivers/tty/tty.h

@@ -147,7 +147,8 @@ extern struct kmessages kmess;
 _PROTOTYPE( void handle_events, (struct tty *tp)			);
 _PROTOTYPE( void sigchar, (struct tty *tp, int sig, int mayflush)	);
 _PROTOTYPE( void tty_task, (void)					);
-_PROTOTYPE( int in_process, (struct tty *tp, char *buf, int count)	);
+_PROTOTYPE( int in_process, (struct tty *tp, char *buf, int count,
+							int scode)	);
 _PROTOTYPE( void out_process, (struct tty *tp, char *bstart, char *bpos,
 				char *bend, int *icount, int *ocount)	);
 _PROTOTYPE( void tty_wakeup, (clock_t now)				);

include/termios.h

@@ -146,6 +146,7 @@ _PROTOTYPE( int tcsetattr, \
 
 /* Extensions to the termios c_iflag bit map.  */
 #define IXANY		0x0800	/* allow any key to continue ouptut */
+#define SCANCODES	0x1000	/* send scancodes */
 
 /* Extensions to the termios c_oflag bit map. They are only active iff
  * OPOST is enabled. */

man/man4/tty.4

@@ -315,6 +315,30 @@ is set a break is input as a single '\e0', or if
 .B PARMRK
 is set as '\e377', '\e0', '\e0'.
 (Breaks are always ignored.)
+.TP
+.B SCANCODES
+Send input as keyboard scancodes rather than processed ASCII characters. This 
+flag only applies to consoles; to check whether the flag is supported use the
+.B tcgetattr
+function after setting it and test whether
+.B c_iflag
+still contains the
+.B SCANCODES
+flag. Scancodes are provided directly and without any processing. As a 
+consequence, the
+.B ISTRIP
+,
+.B IGNCR
+,
+.B ICRNL
+,
+.B INLCR
+,
+.B ICANON
+and
+.B IEXTEN
+flags no longer influence input if this flag is specified. However, they may
+still influence echoing if enabled.  (MINIX 3 specific.)
 .SS "Output Modes"
 The
 .B c_oflag