expressions moved to separate file

expr.h

@@ -0,0 +1,21 @@
+#ifndef expr_h
+#define expr_h
+
+#ifdef __cplusplus
+extern {
+#endif
+
+extern int exprDebug;
+
+size_t replaceExpressions(const char* source, char* buffer, size_t buffersize);
+/* Resolve integer expressions that are either free standing
+ * or in parentheses () embedded in an unquoted word.
+ * Do not resolve expressions in single or double quoted strings.
+ * An expression optionally starts with a integer format such as %x.
+ * It consists of integer numbers, operators and parentheses ().
+ */
+
+#ifdef __cplusplus
+}
+#endif
+#endif