less,microcom,lineedit: use common routine to set raw termios

function                                             old     new   delta
get_termios_and_make_raw                               -     139    +139
xget1                                                 39       8     -31
read_line_input                                     3912    3867     -45
less_main                                           2525    2471     -54
set_termios_to_raw                                   116      36     -80
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/4 up/down: 139/-210)          Total: -71 bytes

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

1 files changed, 5 insertions, 16 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 17766a126..3a092ffe2 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -2259,7 +2259,7 @@ static int32_t reverse_i_search(int timeout)
  */
 int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
 {
-        int len;
+        int len, n;
         int timeout;
 #if ENABLE_FEATURE_TAB_COMPLETION
         smallint lastWasTab = 0;
@@ -2274,9 +2274,10 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 
         INIT_S();
 
-        if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
-         || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON
-        ) {
+        n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
+                | TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */
+        );
+        if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) {
                 /* Happens when e.g. stty -echo was run before.
                  * But if ICANON is not set, we don't come here.
                  * (example: interactive python ^Z-backgrounded,
@@ -2329,18 +2330,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 #endif
 #define command command_must_not_be_used
 
-        new_settings = initial_settings;
-        /* ~ICANON: unbuffered input (most c_cc[] are disabled, VMIN/VTIME are enabled) */
-        /* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */
-        /* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */
-        new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG);
-        /* reads will block only if < 1 char is available */
-        new_settings.c_cc[VMIN] = 1;
-        /* no timeout (reads block forever) */
-        new_settings.c_cc[VTIME] = 0;
-        /* Should be not needed if ISIG is off: */
-        /* Turn off CTRL-C */
-        /* new_settings.c_cc[VINTR] = _POSIX_VDISABLE; */
         tcsetattr_stdin_TCSANOW(&new_settings);
 
 #if ENABLE_USERNAME_OR_HOMEDIR