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From: d89-mlt@sm.luth.se (Morgan Lindqvist)
Newsgroups: comp.sys.handhelds
Subject: HP48:Error msg information and question
Keywords: HP48 error lib
Message-ID: <1660@tau.sm.luth.se>
Date: 1 Jun 91 14:48:51 GMT
Distribution: comp
Organization: University of Lulea, Sweden
Lines: 53


Hello World!

This article have two parts, first some information and then a
question.

The information about the errorhandler.
 
If you want a program (that you writes) to say

MYPROG Error:
Too Few Arguments

And the ERRN (error number) not to bee #70000h. The program must
reside in a library, and it must bee written in internal code
e.i. NOT RPL.

(ERRN becomes #70000h if you give a string as input to DOERR )

Example:

Sdup			@ A program that DUP a string

02d9d			@ Program start
  18ece		 	@ Saves last RPL name e.i 'Sdup',
			@ verifies depth >=1 and
			@ checks argument type 
  0400d			@ <3h> internal type of a string
  02d9d			@ Program start
   03188			@ Internal DUP
  0312b			@ Program end
0312b			@ Program end

The difference between this and a normal internal program is the
Save last... instruction, it doesn't just save 'Sdup' it saves
the entire stack also. So if you call #10f86h (invalid syntax) in
the inner program the errorhandler first restores the stack and
then displays 

Sdup Error:
Invalid Syntax


Now too the question.

How do one do if one want to display a local Xlib error.
e.i. ERRN=#64001h error number 1 in library 640h (1600d).

DOERR doesn't restore the stack or display the RPL name.

Opinions are very welcome.

Morgan Lindqvist d89-mlt@sigma.sm.luth.se