libbb: consolidate the code to set termios unbuffered mode

function                                             old     new   delta
set_termios_to_raw                                     -     116    +116
count_lines                                           72      74      +2
powertop_main                                       1458    1430     -28
top_main                                             943     914     -29
more_main                                            759     714     -45
fsck_minix_main                                     2969    2921     -48
conspy_main                                         1197    1135     -62
rawmode                                               99      36     -63
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/6 up/down: 118/-275)         Total: -157 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 5 insertions, 5 deletions

diff --git a/loginutils/getty.c b/loginutils/getty.c
index 162c1697e..ba6c784a3 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -316,7 +316,7 @@ static void init_tty_attrs(int speed)
         /* non-raw output; add CR to each NL */
         G.tty_attrs.c_oflag = OPOST | ONLCR;
 
-        /* reads would block only if < 1 char is available */
+        /* reads will block only if < 1 char is available */
         G.tty_attrs.c_cc[VMIN] = 1;
         /* no timeout (reads block forever) */
         G.tty_attrs.c_cc[VTIME] = 0;
diff --git a/loginutils/vlock.c b/loginutils/vlock.c
index 52ae607c9..5ba6a8780 100644
--- a/loginutils/vlock.c
+++ b/loginutils/vlock.c
@@ -105,12 +105,12 @@ int vlock_main(int argc UNUSED_PARAM, char **argv)
         ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
 #endif
 
+//TODO: use set_termios_to_raw()
         tcgetattr(STDIN_FILENO, &oterm);
         term = oterm;
-        term.c_iflag &= ~BRKINT;
-        term.c_iflag |= IGNBRK;
-        term.c_lflag &= ~ISIG;
-        term.c_lflag &= ~(ECHO | ECHOCTL);
+        term.c_iflag |= IGNBRK; /* ignore serial break (why? VTs don't have breaks, right?) */
+        term.c_iflag &= ~BRKINT; /* redundant? "dont translate break to SIGINT" */
+        term.c_lflag &= ~(ISIG | ECHO | ECHOCTL); /* ignore ^C ^Z, echo off */
         tcsetattr_stdin_TCSANOW(&term);
 
         while (1) {