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diff --git a/env.h b/env.h
index b690106..73bcedd 100644
--- a/env.h
+++ b/env.h
@@ -1,14 +1,15 @@
-#ifndef ENV_H
-#define ENV_H
-
-TCHAR *copy_environment_block(TCHAR *);
-TCHAR *useful_environment(TCHAR *);
-TCHAR *expand_environment_string(TCHAR *);
-int set_environment_block(TCHAR *);
-int clear_environment();
-int duplicate_environment(TCHAR *);
-int test_environment(TCHAR *);
-void duplicate_environment_strings(TCHAR *);
-TCHAR *copy_environment();
-
-#endif
+#ifndef ENV_H
+#define ENV_H
+
+size_t environment_length(TCHAR *);
+TCHAR *copy_environment_block(TCHAR *);
+TCHAR *useful_environment(TCHAR *);
+TCHAR *expand_environment_string(TCHAR *);
+int set_environment_block(TCHAR *);
+int clear_environment();
+int duplicate_environment(TCHAR *);
+int test_environment(TCHAR *);
+void duplicate_environment_strings(TCHAR *);
+TCHAR *copy_environment();
+
+#endif