Implement basic canonical mode for Windows

The `cat` command now works properly, when run by itself on the bash
command prompt. It's working beautifully so far, and is only missing
a few keystrokes for clearing words and lines. Definitely works more
well than the one that ships with WIN32 :-)

libc/intrin/g_fds.c

@@ -123,9 +123,6 @@ textstartup void __init_fds(int argc, char **argv, char **envp) {
     SetupWinStd(fds, 0, kNtStdInputHandle, sockset);
     SetupWinStd(fds, 1, kNtStdOutputHandle, sockset);
     SetupWinStd(fds, 2, kNtStdErrorHandle, sockset);
-    __veof = CTRL('D');
-    __vintr = CTRL('C');
-    __vquit = CTRL('\\');
   }
   fds->p[1].flags = O_WRONLY | O_APPEND;
   fds->p[2].flags = O_WRONLY | O_APPEND;

libc/intrin/kprintf.greg.c

@@ -800,7 +800,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
           // undocumented %r specifier
           // used for good carriage return
           // helps integrate loggers with repls
-          if (!__replstderr || __nocolor) {
+          if (!__ttyconf.replstderr || __nocolor) {
             break;
           } else {
             s = "\r\e[K";

libc/intrin/nomultics.c

@@ -16,13 +16,17 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/ttydefaults.h"
 #include "libc/intrin/nomultics.internal.h"
 
-unsigned char __replmode;
-unsigned char __replstderr;
-unsigned char __ttymagic;
-unsigned char __veof;
-unsigned char __vintr;
-unsigned char __vquit;
-unsigned char __vtime;
-unsigned char __mousebuttons;
+struct TtyConf __ttyconf = {
+    .vmin = 1,
+    .veof = CTRL('D'),
+    .vintr = CTRL('C'),
+    .vquit = CTRL('\\'),
+    .verase = CTRL('?'),
+    .vwerase = CTRL('W'),
+    .vkill = CTRL('U'),
+    .vreprint = CTRL('R'),
+    .vlnext = CTRL('V'),
+};

libc/intrin/nomultics.internal.h

@@ -1,18 +1,48 @@
-#ifndef COSMOPOLITAN_LIBC_INTRIN_NOMULTICS_INTERNAL_H_
-#define COSMOPOLITAN_LIBC_INTRIN_NOMULTICS_INTERNAL_H_
-#include "libc/calls/struct/timespec.h"
+#ifndef COSMOPOLITAN_NOMULTICS_H_
+#define COSMOPOLITAN_NOMULTICS_H_
+
+#define kTtySilence 1  /* do not relay read() into write() */
+#define kTtyEchoRaw 2  /* don't ^X visualize control codes */
+#define kTtyUncanon 4  /* enables non-canonical (raw) mode */
+#define kTtyNoCr2Nl 8  /* don't map \r → \n (a.k.a !ICRNL) */
+#define kTtyNoIsigs 16 /* don't auto-raise signals on keys */
+#define kTtyXtMouse 32 /* enables eXtreme Xterm mouse mode */
+
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
-extern unsigned char __replmode;
-extern unsigned char __replstderr;
-extern unsigned char __ttymagic;
-extern unsigned char __veof;
-extern unsigned char __vintr;
-extern unsigned char __vquit;
-extern unsigned char __vtime;
-extern unsigned char __mousebuttons;
+struct TtyConf {
+  unsigned char magic;
+  unsigned char mousebs;
+  unsigned char replmode;
+  unsigned char replstderr;
+  union {
+    unsigned char c_cc[20];
+    struct {
+      unsigned char vline;
+      unsigned char vintr;  /* SIGINT keystroke (isigs) */
+      unsigned char vquit;  /* SIGQUIT keystroke (isigs) */
+      unsigned char verase; /* backspace keystroke (canon) */
+      unsigned char vkill;  /* kill line back keystroke (canon) */
+      unsigned char veof;   /* EOF keystroke (canon) */
+      unsigned char vtime;  /* vtime*100ms can control read delay */
+      unsigned char vmin;   /* use 0 for special non-blocking mode */
+      unsigned char vswtc;
+      unsigned char vstart;
+      unsigned char vstop;
+      unsigned char vsusp; /* keystroke for SIGTSTP (isigs) */
+      unsigned char veol;
+      unsigned char vreprint; /* keystroke to print unread line (canon) */
+      unsigned char vdiscard;
+      unsigned char vwerase; /* keystroke for kill word back (canon) */
+      unsigned char vlnext;  /* print next keystroke as ascii (canon) */
+      unsigned char veol2;
+    };
+  };
+};
+
+extern struct TtyConf __ttyconf;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
-#endif /* COSMOPOLITAN_LIBC_INTRIN_NOMULTICS_INTERNAL_H_ */
+#endif /* COSMOPOLITAN_NOMULTICS_H_ */