Lots of work on unicode support

luprex/cpp/drv/driver-linux.cpp

@@ -219,18 +219,18 @@ static int socket_poll(struct pollfd *pollvec, int pollcount, int mstimeout, std
 }
 
 // Write unicode onto the console.
-static void console_write(const CodepointString &cps) {
-    std::string utf8 = ReadlineDevice::to_utf8(cps);
+static void console_write(const std::u32string &cps) {
+    std::string utf8 = drvutil::to_utf8(cps);
     write(1, utf8.c_str(), utf8.size());
 }
 
-static CodepointString console_read() {
-    CodepointString result;
+static std::u32string console_read() {
+    std::u32string result;
     char buffer[512];
     int nread = read(0, buffer, 512);
     if (nread > 0) {
         std::string_view s(buffer, nread);
-        result = ReadlineDevice::from_utf8(s, nullptr);
+        result = drvutil::from_utf8(s, nullptr);
     }
     return result;
 }