Simple C string test

Was added for Javascript, but was not being used in full test-suite.
Rename from javascript_unicode to simple_string and provide for all
languages.
Rewrite to use portable C

Examples/test-suite/common.mk

@@ -613,6 +613,7 @@ C_TEST_CASES += \
 	simple_array \
 	sizeof_pointer \
 	sneaky1 \
+	string_simple \
 	struct_rename \
 	struct_initialization \
 	typedef_struct \

Examples/test-suite/javascript/javascript_unicode_runme.js

@@ -1,9 +0,0 @@
-var javascript_unicode = require("./javascript_unicode");
-
-var str = "olé";
-
-var copy = javascript_unicode.copy_string(str);
-
-if (str !== copy) {
-	print("Error: copy is not equal: original="+str+", copy="+copy);
-}

Examples/test-suite/javascript/string_simple_runme.js

@@ -0,0 +1,10 @@
+var string_simple = require("./string_simple");
+
+// Test unicode string
+var str = "olé";
+
+var copy = string_simple.copy_string(str);
+
+if (str !== copy) {
+  throw "Error: copy is not equal: original="+str+", copy="+copy;
+}

Examples/test-suite/javascript_unicode.i

@@ -1,10 +0,0 @@
-%module javascript_unicode
-
-%newobject copy_string;
-
-%inline %{
-#include <string.h>
-const char* copy_string(const char* str) {
-	return strdup(str);
-}
-%}

Examples/test-suite/string_simple.i

@@ -0,0 +1,13 @@
+%module string_simple
+
+%newobject copy_string;
+
+%inline %{
+#include <string.h>
+const char* copy_string(const char* str) {
+  size_t len = strlen(str);
+  char* newstring = malloc(len + 1);
+  strcpy(newstring, str);
+  return newstring;
+}
+%}