Changeset 14708 for trunk/Ohana/src/opihi/lib.shell/dvomath.c

Timestamp:

Aug 30, 2007, 10:57:43 AM (19 years ago)

Author:

eugene

Message:

added a comment

File:

• trunk/Ohana/src/opihi/lib.shell/dvomath.c (modified) (1 diff)

trunk/Ohana/src/opihi/lib.shell/dvomath.c

@@ -3 +3 @@
 /* return value on success is temp vector/buffer name or scalar value return value on error is NULL, all
    internals freed.  errors are sent to error stack.  may be printed by calling function */
+
+/* XXX this function breaks the elements of the line into objects, numbers, and operators.  it
+ * then converts the list to an RPN expresssion.  it then evaluates the expression.  if an
+ * expression is not a valid math expression (string - string), it results in an error.  The
+ * problem is that elements of a valid expression may be invalid as expressions on their own
+ * (eg, string consisting of word-word).  this function probably should be somewhat smarter
+ * about breaking down items into strings and objects.  for the time being, the user must
+ * protect string items with double quotes for safety.
+ */
    
 char *dvomath (int argc, char **argv, int *size, int validsize) {