Implement text input

src/linux/nact_linux.cpp

@@ -1,8 +1,35 @@
 #include <stdio.h>
 #include "nact.h"
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+
+extern "C" {
+// ags_text.cpp
+char* sjis2utf(char* src);
+char* utf2sjis(char* src);
+}
+#endif
 
 void NACT::text_dialog()
 {
+#ifdef __EMSCRIPTEN__
+	static char buf[256];
+	char *oldstr = sjis2utf(tvar[tvar_index - 1]);
+	int ok = EM_ASM_({
+			var r = xsystem35.shell.inputString("文字列を入力してください", UTF8ToString($0), 8);
+			if (r) {
+				stringToUTF8(r, $1, $2);
+				return 1;
+			}
+			return 0;
+		}, oldstr, buf, sizeof buf);
+	free(oldstr);
+	if (ok) {
+		char *newstr = utf2sjis(buf);
+		strcpy_s(tvar[tvar_index - 1], 22, newstr);
+		free(newstr);
+	}
+#endif
 }
 
 void NACT::initialize_console()