feat: switch text to UTF-8; add Unicode key events, dead keys & Czech layout; fix numpad navigation; add NumLock support

template/sysroot/include/montauk/syscall.h

@@ -7,6 +7,7 @@
 #pragma once
 #include <Api/Syscall.hpp>
 #include <montauk/statuscodes.h>
+#include <montauk/utf8.h>
 
 namespace montauk {
 
@@ -222,7 +223,23 @@ namespace montauk {
 
     // Keyboard
     inline bool is_key_available() { return (bool)syscall0(montauk::abi::SYS_ISKEYAVAILABLE); }
-    inline void getkey(montauk::abi::KeyEvent* out) { syscall1(montauk::abi::SYS_GETKEY, (uint64_t)out); }
+    // Scancode to use when checking for navigation keys (arrows, Home/End,
+    // PgUp/PgDn, Insert/Delete). The keypad shares those scancodes with its
+    // digit and '.' keys, so a keypad key that types a character reports 0
+    // here: numpad 4 is text, not Left. Compare against this, not .scancode.
+    inline uint8_t nav_scancode(const montauk::abi::KeyEvent& key) {
+        uint8_t sc = key.scancode;
+        if (!key.extended && (sc & 0x7F) >= 0x47 && (sc & 0x7F) <= 0x53 &&
+            montauk::utf8::key_codepoint(key) != 0)
+            return 0;
+        return sc;
+    }
+
+    // Fills the full event, including the Unicode codepoint the key types.
+    inline void getkey(montauk::abi::KeyEvent* out) {
+        syscall2(montauk::abi::SYS_GETKEY_EX, (uint64_t)out, sizeof(*out));
+    }
+    // Text keys arrive as UTF-8, one byte per call.
     inline char getchar() { return (char)syscall0(montauk::abi::SYS_GETCHAR); }
     // Returns 0 rather than blocking when no character is pending.
     inline char getchar_nb() { return (char)syscall0(montauk::abi::SYS_GETCHAR_NB); }
@@ -496,7 +513,8 @@ namespace montauk {
         return (int)syscall3(montauk::abi::SYS_CHILDIO_WRITE, (uint64_t)childPid, (uint64_t)data, (uint64_t)len);
     }
     inline int childio_writekey(int childPid, const montauk::abi::KeyEvent* key) {
-        return (int)syscall2(montauk::abi::SYS_CHILDIO_WRITEKEY, (uint64_t)childPid, (uint64_t)key);
+        return (int)syscall3(montauk::abi::SYS_CHILDIO_WRITEKEY_EX, (uint64_t)childPid,
+                             (uint64_t)key, sizeof(*key));
     }
     inline int childio_settermsz(int childPid, int cols, int rows) {
         return (int)syscall3(montauk::abi::SYS_CHILDIO_SETTERMSZ, (uint64_t)childPid, (uint64_t)cols, (uint64_t)rows);