win32: add support for virtual terminal input

Alter certain applets to support virtual terminal input, if enabled.

In many places this is achieved by building previously excluded
upstream terminal-handling code.  The busybox-w32 implementation
of termios(3) functions does nothing if virtual terminal input is
disabled, so it can be invoked regardless.

Some applet-specific terminal-handling code is also required.

This affects less, more, vi and command line editing in the shell.
(The `more` applet isn't enabled in the default configuration.)

This series of patches adds about 1.7KB to the binaries.

1 files changed, 7 insertions, 4 deletions

diff --git a/util-linux/more.c b/util-linux/more.c
index 07275131e..84ce37bc7 100644
--- a/util-linux/more.c
+++ b/util-linux/more.c
@@ -62,6 +62,7 @@ static void tcsetattr_tty_TCSANOW(struct termios *settings)
         tcsetattr(G.tty_fileno, TCSANOW, settings);
 }
 
+#if !ENABLE_PLATFORM_MINGW32
 static void gotsig(int sig UNUSED_PARAM)
 {
         /* bb_putchar_stderr doesn't use stdio buffering,
@@ -70,6 +71,7 @@ static void gotsig(int sig UNUSED_PARAM)
         tcsetattr_tty_TCSANOW(&G.initial_settings);
         _exit(EXIT_FAILURE);
 }
+#endif
 
 #define CONVERTED_TAB_SIZE 8
 
@@ -159,12 +161,13 @@ int more_main(int argc UNUSED_PARAM, char **argv)
                                  * to get input from the user.
                                  */
                                 for (;;) {
-#if !ENABLE_PLATFORM_MINGW32
                                         fflush_all();
-                                        input = getc(tty);
-#else
-                                        input = _getch();
+#if ENABLE_PLATFORM_MINGW32
+                                        if (!(terminal_mode(FALSE) & VT_INPUT))
+                                                input = _getch();
+                                        else
 #endif
+                                        input = getc(tty);
                                         input = tolower(input);
                                         /* Erase the last message */
                                         printf("\r%*s\r", len, "");