System.java: (getenv0): New method.

2004-06-14  Andrew Haley  <aph@redhat.com>

        * java/lang/System.java: (getenv0): New method.
        (getenv): Add security check.  Do the right thing.
        * java/lang/natSystem.cc (getenv0): New method.

From-SVN: r83107

libjava/java/lang/natSystem.cc

@@ -142,3 +142,16 @@ java::lang::System::isWordsBigEndian (void)
   u.lval = 1;
   return u.cval == 0;
 }
+
+jstring
+java::lang::System::getenv0 (jstring name)
+{
+  jint len = _Jv_GetStringUTFLength (name);
+  char buf[len + 1];
+  jsize total = JvGetStringUTFRegion (name, 0, name->length(), buf);
+  buf[total] = '\0';
+  const char *value = ::getenv (buf);
+  if (value == NULL)
+    return NULL;
+  return JvNewStringLatin1 (value);
+}