adding zephyr-im master branch

zwgc/eval.h

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+/* This file is part of the Project Athena Zephyr Notification System.
+ * It is one of the source files comprising zwgc, the Zephyr WindowGram
+ * client.
+ *
+ *      Created by:     Marc Horowitz <marc@athena.mit.edu>
+ *
+ *      $Id$
+ *
+ *      Copyright (c) 1989 by the Massachusetts Institute of Technology.
+ *      For copying and distribution information, see the file
+ *      "mit-copyright.h".
+ */
+
+
+#include <zephyr/mit-copyright.h>
+
+#ifndef eval_MODULE
+#define eval_MODULE
+
+#include "new_string.h"
+
+/*
+ *    string eval_expr(Node *expr)
+ *        Modifies: dict
+ *        Requires: expr is a proper expression (NOT NULL).  (see node.c)
+ *        Effects: Evaluates expr to its string value which is returned.
+ *                 The returned string is on the heap and must be freed
+ *                 eventually.
+ */
+
+extern string eval_expr(Node *);
+
+/*
+ *    int eval_bool_expr(Node *expr)
+ *        Modifies: dict
+ *        Requires: expr is a proper expression or NULL.  (see node.c)
+ *        Effects: Evaluates expr to its boolean value which is returned.
+ *                 NULL is defined to have the boolean value true.
+ */
+
+extern int eval_bool_expr(Node *);
+
+#endif