IsAstack ( )

[Klaus Major]

Hi Hugh,

> I need a robust alternative to "if there is  a stack pFilePath"  
> that does
> *not* load the file into memory and potentially  cause problems  
> with shared stack
> name space.
>
> Can anyone improve or see  anything not foolproof with this?
>
> function isAstack  pFilePath
> return line 1 of  url("file:"&pFilePath)="#!/bin/sh"
> end isAstack

In the latest fileformat 2.7x, the first 8 bytes of a valid stackfile  
are:

REVO2700

So I would use a combination of checking the suffix and reading/ 
checking the first
lines/chars of the actual stackfile.

> /H

Regards

Klaus Major
klaus at major-k.de
http://www.major-k.de