win32: add virtual terminal support to termios(3)

Modify `struct termios` to support Windows virtual terminals.
Native console mode flags replace the Unix `c_?flag` structure
members.  Remove unsupported flags from termios.h.

Add implementations of tcgetattr(3)/tcsetattr(3) to get/set console
flags when virtual terminal input mode is enabled.

Add support for emulating raw mode to get_termios_and_make_raw().
This (and related functions) are exposed but not yet used.

3 files changed, 50 insertions, 114 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 388b246ca..bf15f4c75 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -311,13 +311,12 @@ int FAST_FUNC is_TERM_dumb(void)
         return term && strcmp(term, "dumb") == 0;
 }
 
-#if !ENABLE_PLATFORM_MINGW32
 int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
 {
         return tcsetattr(STDIN_FILENO, TCSANOW, tp);
 }
 
-int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct termios *oldterm, int flags)
+int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct termios *oldterm, int flags IF_PLATFORM_MINGW32(UNUSED_PARAM))
 {
 //TODO: slattach, shell read might be adapted to use this too: grep for "tcsetattr", "[VTIME] = 0"
         int r;
@@ -326,6 +325,9 @@ int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct t
         r = tcgetattr(fd, oldterm);
         *newterm = *oldterm;
 
+#if ENABLE_PLATFORM_MINGW32
+        newterm->imode &= ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
+#else
         /* Turn off buffered input (ICANON)
          * Turn off echoing (ECHO)
          * and separate echoing of newline (ECHONL, normally off anyway)
@@ -382,6 +384,7 @@ int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct t
                  */
                 newterm->c_iflag &= ~(IXOFF|IXON|IXANY|BRKINT|INLCR|ICRNL|IUCLC|IMAXBEL);
         }
+#endif
         return r;
 }
 
@@ -392,7 +395,6 @@ int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags)
         get_termios_and_make_raw(fd, &newterm, oldterm, flags);
         return tcsetattr(fd, TCSANOW, &newterm);
 }
-#endif
 
 pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
 {
diff --git a/win32/termios.c b/win32/termios.c
index 7d390ce09..4b3588826 100644
--- a/win32/termios.c
+++ b/win32/termios.c
@@ -1,5 +1,33 @@
 #include "libbb.h"
 
+int tcsetattr(int fd, int mode UNUSED_PARAM, const struct termios *t)
+{
+        if (terminal_mode(FALSE) & VT_INPUT) {
+                HANDLE h = (HANDLE)_get_osfhandle(fd);
+                if (!SetConsoleMode(h, t->imode)) {
+                        errno = err_win_to_posix();
+                        return -1;
+                }
+        }
+
+        return 0;
+}
+
+int tcgetattr(int fd, struct termios *t)
+{
+        if (terminal_mode(FALSE) & VT_INPUT) {
+                HANDLE h = (HANDLE)_get_osfhandle(fd);
+                if (!GetConsoleMode(h, &t->imode)) {
+                        errno = err_win_to_posix();
+                        return -1;
+                }
+        }
+        t->c_cc[VINTR] = 3;     // ctrl-c
+        t->c_cc[VEOF] = 4;      // ctrl-d
+
+        return 0;
+}
+
 int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
 {
         HANDLE cin = GetStdHandle(STD_INPUT_HANDLE);
diff --git a/win32/termios.h b/win32/termios.h
index c98d414f3..8408aa3e3 100644
--- a/win32/termios.h
+++ b/win32/termios.h
@@ -1,125 +1,31 @@
-/* iflag bits */
-#define IGNBRK  0x00001
-#define BRKINT  0x00002
-#define IGNPAR  0x00004
-#define IMAXBEL 0x00008
-#define INPCK   0x00010
-#define ISTRIP  0x00020
-#define INLCR   0x00040
-#define IGNCR   0x00080
-#define ICRNL   0x00100
-#define IXON    0x00400
-#define IXOFF   0x01000
-#define IUCLC   0x04000
-#define IXANY   0x08000
-#define PARMRK  0x10000
+#ifndef TERMIOS_H
+#define TERMIOS_H
 
-/* oflag bits */
+#define VINTR 0
+#define VEOF  1
 
-#define OPOST   0x00001
-#define OLCUC   0x00002
-#define OCRNL   0x00004
-#define ONLCR   0x00008
-#define ONOCR   0x00010
-#define ONLRET  0x00020
-#define OFILL   0x00040
-#define CRDLY   0x00180
-#define CR0     0x00000
-#define CR1     0x00080
-#define CR2     0x00100
-#define CR3     0x00180
-#define NLDLY   0x00200
-#define NL0     0x00000
-#define NL1     0x00200
-#define BSDLY   0x00400
-#define BS0     0x00000
-#define BS1     0x00400
-#define TABDLY  0x01800
-#define TAB0    0x00000
-#define TAB1    0x00800
-#define TAB2    0x01000
-#define TAB3    0x01800
-#define XTABS   0x01800
-#define VTDLY   0x02000
-#define VT0     0x00000
-#define VT1     0x02000
-#define FFDLY   0x04000
-#define FF0     0x00000
-#define FF1     0x04000
-#define OFDEL   0x08000
-
-/* lflag bits */
-#define ISIG    0x0001
-#define ICANON  0x0002
-#define ECHO    0x0004
-#define ECHOE   0x0008
-#define ECHOK   0x0010
-#define ECHONL  0x0020
-#define NOFLSH  0x0040
-#define TOSTOP  0x0080
-#define IEXTEN  0x0100
-#define FLUSHO  0x0200
-#define ECHOKE  0x0400
-#define ECHOCTL 0x0800
-
-#define VDISCARD        1
-#define VEOL            2
-#define VEOL2           3
-#define VEOF            4
-#define VERASE          5
-#define VINTR           6
-#define VKILL           7
-#define VLNEXT          8
-#define VMIN            9
-#define VQUIT           10
-#define VREPRINT        11
-#define VSTART          12
-#define VSTOP           13
-#define VSUSP           14
-#define VSWTC           15
-#define VTIME           16
-#define VWERASE 17
-
-#define TCIFLUSH        0
-#define TCSAFLUSH       1
-#define TCSANOW         2
-#define TCSADRAIN       3
-#define TCSADFLUSH      4
-
-#define  B0     0000000         /* hang up */
-#define  B50    0000001
-#define  B75    0000002
-#define  B110   0000003
-#define  B134   0000004
-#define  B150   0000005
-#define  B200   0000006
-#define  B300   0000007
-#define  B600   0000010
-#define  B1200  0000011
-#define  B1800  0000012
-#define  B2400  0000013
-#define  B4800  0000014
-#define  B9600  0000015
+#define TCIFLUSH    0
+#define TCSAFLUSH   1
+#define TCSANOW     2
+#define TCSADRAIN   3
+#define TCSADFLUSH  4
 
 typedef unsigned char cc_t;
-typedef unsigned int  tcflag_t;
 typedef unsigned int  speed_t;
-typedef unsigned short otcflag_t;
-typedef unsigned char ospeed_t;
 
-#define NCCS            18
+#define NCCS            2
 struct termios {
-        tcflag_t        c_iflag;
-        tcflag_t        c_oflag;
-        tcflag_t        c_cflag;
-        tcflag_t        c_lflag;
-        char            c_line;
         cc_t            c_cc[NCCS];
-        speed_t         c_ispeed;
-        speed_t         c_ospeed;
+        unsigned long   imode;
+        unsigned long   omode;
 };
 
 struct winsize {
         unsigned short ws_row, ws_col;
         unsigned short ws_xpixel, ws_ypixel;
 };
+
+int tcgetattr(int fd, struct termios *t);
+int tcsetattr(int fd, int mode, const struct termios *t);
+
+#endif /* TERMIOS_H */