Re: groff <= 1.19.3, ms macros -- confusing warning for 1 < pl < 13

[Keith Marshall]

On Sunday 15 July 2007 06:06, Werner LEMBERG wrote:
> > I observed this unexpected behaviour:-- [...]
> >
> > Ok to apply the following patch, which resolves this?
>
> Please do.

Done.

FWIW, and for completeness, I did also check with:--

  $ nroff -ms
  .pl 0
  .LP
  <standard input>:2: warning: number register `0:ds-type' not defined
  <standard input>:2: warning: number register `0:LL' not defined
  <standard input>:2: warning: number register `0:ri' not defined
  <standard input>:2: warning: number register `0:LT' not defined
  <standard input>:2: warning: number register `0:li' not defined
  <standard input>:2: warning: macro `FAM' not defined
  <standard input>:2: warning: number register `0:PS' not defined
  <standard input>:2: warning: number register `0:VS' not defined
  <standard input>:2: warning: number register `0:PD' not defined
  <standard input>:2: warning: number register `0:PI' not defined

and with:--

  $ nroff -ms
  .pl 1
  .LP
  :
  :
  <standard input>:2: fatal error: input stack limit exceeded
    (probable infinite loop)

The `.pl 0' case is clearly some part of the initialisation code being 
skipped, at zero page length, while the `.pl 1' case is, presumably, 
recursive springing of the top of page trap.  I guess it should be 
possible to protect against these two cases, but, given the limited 
usefulness of these short page lengths, it may not be worth the effort.

Regards,
Keith.