Strings are now 2 bytes per character

c/frame.c

@@ -409,7 +409,7 @@ void vm_exception(struct vm * vm, struct objectref * objectref)
       printc(')');
       prints("\n    ");
       struct arrayref * arrayref = string_objectref->aref[0];
-      print__string(arrayref->u8, arrayref->length);
+      print_chars(arrayref->u16, arrayref->length);
       printc('\n');
     }
   }

c/native.c

@@ -88,9 +88,21 @@ const static struct native_method native_method[] = {
   },
   {
     .class_name = "java/io/PrintStream",
-    .method_name = "write",
+    .method_name = "_write",
     .method_descriptor = "([B)V",
-    .func = native_java_io_printstream_write_1,
+    .func = native_java_io_printstream_write_ba_1,
+  },
+  {
+    .class_name = "java/io/PrintStream",
+    .method_name = "_write",
+    .method_descriptor = "([C)V",
+    .func = native_java_io_printstream_write_ca_1,
+  },
+  {
+    .class_name = "java/io/PrintStream",
+    .method_name = "_write",
+    .method_descriptor = "(Ljava/lang/String;)V",
+    .func = native_java_io_printstream_write_s_1,
   },
   {
     .class_name = "jvm/internal/Loader",

c/native/printstream.c

@@ -2,8 +2,21 @@
 #include "printstream.h"
 #include "printf.h"
 
-void native_java_io_printstream_write_1(struct vm * vm, uint32_t * args)
+void native_java_io_printstream_write_ba_1(struct vm * vm, uint32_t * args)
 {
   struct arrayref * arrayref = (struct arrayref *)args[0];
-  print_string((const char *)arrayref->u8, arrayref->length);
+  print_bytes(arrayref->u8, arrayref->length);
+}
+
+void native_java_io_printstream_write_ca_1(struct vm * vm, uint32_t * args)
+{
+  struct arrayref * arrayref = (struct arrayref *)args[0];
+  print_chars(arrayref->u16, arrayref->length);
+}
+
+void native_java_io_printstream_write_s_1(struct vm * vm, uint32_t * args)
+{
+  struct objectref * objectref = (struct objectref *)args[0];
+  struct arrayref * arrayref = objectref->aref[0];
+  print_chars(arrayref->u16, arrayref->length);
 }

c/native/printstream.h

@@ -4,4 +4,6 @@
 
 #include "frame.h"
 
-void native_java_io_printstream_write_1(struct vm * vm, uint32_t * args);
+void native_java_io_printstream_write_ba_1(struct vm * vm, uint32_t * args);
+void native_java_io_printstream_write_ca_1(struct vm * vm, uint32_t * args);
+void native_java_io_printstream_write_s_1(struct vm * vm, uint32_t * args);

c/printf.c

@@ -78,6 +78,20 @@ void print_string(const char * s, int length)
   }
 }
 
+void print_bytes(const uint8_t * s, int length)
+{
+  for (int i = 0; i < length; i++) {
+    print_char(s[i]);
+  }
+}
+
+void print_chars(const uint16_t * s, int length)
+{
+  for (int i = 0; i < length; i++) {
+    print_char(s[i]);
+  }
+}
+
 void print_cstring(const char * s)
 {
   while (*s != 0) {

c/printf.h

@@ -6,6 +6,8 @@
 #include <stdio.h>
 #endif
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -20,6 +22,8 @@ static inline void print_char(char c)
 }
 
 void print_string(const char * s, int length);
+void print_bytes(const uint8_t * s, int length);
+void print_chars(const uint16_t * s, int length);
 void print_cstring(const char * s);
 
 void _printf(const char * format, ...);

classes/java/io/PrintStream.java

@@ -10,94 +10,94 @@ public class PrintStream
 
     private static final byte[] newline = {'\n'};
 
-    public static native void write(byte[] buf);
+    private static native void _write(byte[] buf);
 
-    public static void write(String s) {
-        write(s.getBytes());
-    }
+    private static native void _write(char[] buf);
+
+    private static native void _write(String s);
 
     public void print(byte[] buf) {
-        write(buf);
+        _write(buf);
     }
 
     public void print(boolean b) {
-        write(String.valueOf(b));
+        _write(String.valueOf(b));
     }
 
     public void print(char c) {
-        write(String.valueOf(c));
+        _write(String.valueOf(c));
     }
 
     public void print(int i) {
-        write(String.valueOf(i));
+        _write(String.valueOf(i));
     }
 
     public void print(long l) {
-        write(String.valueOf(l));
+        _write(String.valueOf(l));
     }
 
     public void print(float f) {
-        write(String.valueOf(f));
+        _write(String.valueOf(f));
     }
 
     public void print(double d) {
-        write(String.valueOf(d));
+        _write(String.valueOf(d));
     }
 
     public void print(Object obj) {
-        write(String.valueOf(obj));
+        _write(String.valueOf(obj));
     }
 
     public void print(String s) {
-        write(String.valueOf(s));
+        _write(String.valueOf(s));
     }
 
     public void println() {
-        write(newline);
+        _write(newline);
     }
 
     public void println(byte[] buf) {
-        write(buf);
-        write(newline);
+        _write(buf);
+        _write(newline);
     }
 
     public void println(boolean b) {
-        write(String.valueOf(b));
-        write(newline);
+        _write(String.valueOf(b));
+        _write(newline);
     }
 
     public void println(char c) {
-        write(String.valueOf(c));
-        write(newline);
+        _write(String.valueOf(c));
+        _write(newline);
     }
 
     public void println(int i) {
-        write(String.valueOf(i));
-        write(newline);
+        _write(String.valueOf(i));
+        _write(newline);
     }
 
     public void println(long l) {
-        write(String.valueOf(l));
-        write(newline);
+        _write(String.valueOf(l));
+        _write(newline);
     }
 
     public void println(float f) {
-        write(String.valueOf(f));
-        write(newline);
+        _write(String.valueOf(f));
+        _write(newline);
     }
 
     public void println(double d) {
-        write(String.valueOf(d));
-        write(newline);
+        _write(String.valueOf(d));
+        _write(newline);
     }
 
     public void println(Object obj) {
-        write(String.valueOf(obj));
-        write(newline);
+        _write(String.valueOf(obj));
+        _write(newline);
     }
 
     public void println(String s) {
-        write(String.valueOf(s));
-        write(newline);
+        _write(String.valueOf(s));
+        _write(newline);
     }
 }