R devel - Jan 2012 - checkRd freezes while parsing erroneous preprocessor macros

Dear developers,

I came across with a bug while parsing Rd files.

Given is the following minimal Rd file:

----
\name{foo}
\title{foo}
\description{
#ifdef windows
	win
#endifd
#ifdef unix
	unix
#endif
}
----

By accident I have a typo at line 6, instead of having #endif I typed #endifd.

If I run checkRd(), parse_Rd(), Rd2HTML(), or others including the command line
"R CMD Rconv" R will freeze and the only chance I have is to kill R.

As far as I can tell for checkRd() the problem is the internal function
prepare_Rd() which runs for ever.

Is there a way to avoid having that freezing behaviour?

I'm on a Mac running Snow Leopard:

R version 2.14.0 (2011-10-31)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_GB.UTF-8/en_US.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] tools     stats     graphics  grDevices utils     datasets  methods   base


Many thanks in advance,
--Hans

On 13/01/2012 8:06 AM, Hans-J?rg Bibiko wrote:
> Dear developers,
>
> I came across with a bug while parsing Rd files.
>
> Given is the following minimal Rd file:
>
> ----
> \name{foo}
> \title{foo}
> \description{
> #ifdef windows
> 	win
> #endifd
> #ifdef unix
> 	unix
> #endif
> }
> ----
>
> By accident I have a typo at line 6, instead of having #endif I typed
#endifd.
>
> If I run checkRd(), parse_Rd(), Rd2HTML(), or others including the command
line "R CMD Rconv" R will freeze and the only chance I have is to kill
R.
>
> As far as I can tell for checkRd() the problem is the internal function
prepare_Rd() which runs for ever.
>
> Is there a way to avoid having that freezing behaviour?

The obvious way is not to have the typo in your file, but I'll look into 
what's causing it so you're allowed to have errors.

Duncan Murdoch
> I'm on a Mac running Snow Leopard:
>
> R version 2.14.0 (2011-10-31)
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
> locale:
> [1] en_GB.UTF-8/en_US.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
>
> attached base packages:
> [1] tools     stats     graphics  grDevices utils     datasets  methods  
base
>
>
> Many thanks in advance,
> --Hans
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