Re: [Module::Build] ./Build on Win98

[David G. <da...@hy...>]

Randy W. Sims wrote:
>>> Otherwise, I'm not sure how to quote the percent symbol (%%* doesn't 
>>> work). I've posted a message over on alt.msdos.batch about this.
>>
>> Won't the multi-argument form of system() be helpful here?  It's 
>> generally much easier to get that to work out than trying to get 
>> quoting right.
> 
> It doesn't seem so... In order to use redirection in the command that's 
> executed, the shell must be invoked. If you use the multiple arg form of 
> system, you have to explicitly specify the shell. The problem is the 
> shell then requires the syntax:
> 
>  $shell /C "$string"

I've been deleting this thread for a while for lack of time to read it, 
but caught up briefly here.  I apologize if this has been discussed 
already or you're well beyond it, but Roderich Schupp and I had a short 
exchange a while ago about windows shell quoting in discussing 
improvement to IPC::Run3.  In short, we concluded it's really ugly.  By 
triangulating between Perl, Haskell and gtk/glib source and comments, he 
came up with the following escaping algorithm:

     sub protect_argv_string
     {
         my ($p) = @_;
         (my $q = $p) =~ s/(\\*)"/$1$1\\"/g;
         $q = qq["$q"] if $p =~ /[ \t]/;
         return $q;
     }

That said, I don't think we ever came up with a way of properly escaping 
"%".  You can precede it with a backslash it to prevent it from being 
interpreted as an environment variable, but the backslash itself appears 
in the output.

Regards,
David