Adding Termios library as std::libc::termios (posix libc functions) (#1272)

Adding libc's termios to lib/std/libc

lib/std/libc/os/posix.c3

@@ -53,3 +53,138 @@ struct Stack_t
 
 extern fn CInt sigaltstack(Stack_t* ss, Stack_t* old_ss);
 extern fn CInt sigaction(CInt signum, Sigaction *action, Sigaction *oldaction);
+
+module libc::termios @if($and(env::LIBC, env::POSIX));
+
+distinct Cc = char;
+distinct Speed = CUInt;
+distinct Tcflags = CUInt;
+
+const Tcflags TCOOFF = 0;
+const Tcflags TCOON = 1;
+const Tcflags TCIOFF = 2;
+const Tcflags TCION = 3;
+const Tcflags TCIFLUSH = 0;
+const Tcflags TCOFLUSH = 1;
+const Tcflags TCIOFLUSH = 2;
+const Tcflags TCSANOW = 0;
+const Tcflags TCSADRAIN = 1;
+const Tcflags TCSAFLUSH = 2;
+const Speed B0 = 0000000;
+const Speed B50 = 0000001;
+const Speed B75 = 0000002;
+const Speed B110 = 0000003;
+const Speed B134 = 0000004;
+const Speed B150 = 0000005;
+const Speed B200 = 0000006;
+const Speed B300 = 0000007;
+const Speed B600 = 0000010;
+const Speed B1200 = 0000011;
+const Speed B1800 = 0000012;
+const Speed B2400 = 0000013;
+const Speed B4800 = 0000014;
+const Speed B9600 = 0000015;
+const Speed B19200 = 0000016;
+const Speed B38400 = 0000017;
+const Speed B57600 = 0010001;
+const Speed B115200 = 0010002;
+const Speed B230400 = 0010003;
+const Speed B460800 = 0010004;
+const Speed B500000 = 0010005;
+const Speed B576000 = 0010006;
+const Speed B921600 = 0010007;
+const Speed B1000000 = 0010010;
+const Speed B1152000 = 0010011;
+const Speed B1500000 = 0010012;
+const Speed B2000000 = 0010013;
+const Speed B2500000 = 0010014;
+const Speed B3000000 = 0010015;
+const Speed B3500000 = 0010016;
+const Speed B4000000 = 0010017;
+const Speed MAX_BAUD = B4000000;
+const CInt VINTR = 0;
+const CInt VQUIT = 1;
+const CInt VERASE = 2;
+const CInt VKILL = 3;
+const CInt VEOF = 4;
+const CInt VTIME = 5;
+const CInt VMIN = 6;
+const CInt VSWTC = 7;
+const CInt VSTART = 8;
+const CInt VSTOP = 9;
+const CInt VSUSP = 10;
+const CInt VEOL = 11;
+const CInt VREPRINT = 12;
+const CInt VDISCARD = 13;
+const CInt VWERASE = 14;
+const CInt VLNEXT = 15;
+const CInt VEOL2 = 16;
+const CInt ISIG = 0000001;
+const CInt ICANON = 0000002;
+const CInt ECHO = 0000010;
+const CInt ECHOE = 0000020;
+const CInt ECHOK = 0000040;
+const CInt ECHONL = 0000100;
+const CInt NOFLSH = 0000200;
+const CInt TOSTOP = 0000400;
+const CInt IEXTEN = 0100000;
+const CInt CSIZE = 0000060;
+const CInt CS5 = 0000000;
+const CInt CS6 = 0000020;
+const CInt CS7 = 0000040;
+const CInt CS8 = 0000060;
+const CInt CSTOPB = 0000100;
+const CInt CREAD = 0000200;
+const CInt PARENB = 0000400;
+const CInt PARODD = 0001000;
+const CInt HUPCL = 0002000;
+const CInt CLOCAL = 0004000;
+const CInt OPOST = 0000001;
+const CInt OLCUC = 0000002;
+const CInt ONLCR = 0000004;
+const CInt OCRNL = 0000010;
+const CInt ONOCR = 0000020;
+const CInt ONLRET = 0000040;
+const CInt OFILL = 0000100;
+const CInt OFDEL = 0000200;
+const CInt VTDLY = 0040000;
+const CInt VT0 = 0000000;
+const CInt VT1 = 0040000;
+const CInt IGNBRK = 0000001;
+const CInt BRKINT = 0000002;
+const CInt IGNPAR = 0000004;
+const CInt PARMRK = 0000010;
+const CInt INPCK = 0000020;
+const CInt ISTRIP = 0000040;
+const CInt INLCR = 0000100;
+const CInt IGNCR = 0000200;
+const CInt ICRNL = 0000400;
+const CInt IUCLC = 0001000;
+const CInt IXON = 0002000;
+const CInt IXANY = 0004000;
+const CInt IXOFF = 0010000;
+const CInt IMAXBEL = 0020000;
+const CInt IUTF8 = 0040000;
+
+extern fn CInt tcgetattr(Fd fd, Termios* self);
+extern fn CInt tcsetattr(Fd fd, CInt optional_actions, Termios* self);
+extern fn CInt tcsendbreak(Fd fd, CInt duration);
+extern fn CInt tcdrain(Fd fd);
+extern fn CInt tcflush(Fd fd, CInt queue_selector);
+extern fn CInt tcflow(Fd fd, CInt action);
+extern fn Speed cfgetospeed(Termios* self);
+extern fn Speed cfgetispeed(Termios* self);
+extern fn CInt cfsetospeed(Termios* self, Speed speed);
+extern fn CInt cfsetispeed(Termios* self, Speed speed);
+
+const CInt NCCS = 32;
+struct Termios {
+        Tcflags c_iflag;
+        Tcflags c_oflag;
+        Tcflags c_cflag;
+        Tcflags c_lflag;
+        Cc c_line;
+        Cc[NCCS] c_cc;
+        Speed c_ispeed;
+        Speed c_ospeed;
+}