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Re: [mmse] Adding a footnote yields a infinite loop.

From: G. Branden Robinson
Subject: Re: [mmse] Adding a footnote yields a infinite loop.
Date: Sat, 19 Nov 2022 15:24:03 -0600

Hi Hans,

At 2022-11-19T21:42:41+0100, hbezemer--- via wrote:
> I noticed that when using mmse it seems to give an error when adding a
> footnote.  Groff terminates with the following error message:
> "fatal error: input stack limit exceeded (probable infinite loop)"
> I can reproduce it with:
> groff -Tpdf -mmse SE.groff > SE.pdf

I was able to reproduce it too.  Thanks!

Here's a fix.

diff --git a/contrib/mm/mse.tmac b/contrib/mm/mse.tmac
index dedfb10bb..8184b1434 100644
--- a/contrib/mm/mse.tmac
+++ b/contrib/mm/mse.tmac
@@ -43,7 +43,7 @@
 .po \n[@po]u
 .pl \n[@pl]u
 . pg*footer-size 4\"                  1v+footer+even/odd footer+1v pg*footer-size 4v\"                  1v+footer+even/odd footer+1v
 .\" Dokumentnamn
 .ds LetDNAMN

The problem is that someone (presumably macro package author Jörgen
Hägg) left the scaling unit off of the `pg*footer-size` register
assignment, so the size used for the page footer was 4 basic units
instead of 4 vees.  The former value is too small by five orders of
magnitude (a factor of twelve thousand).

I hadn't really looked at mse.tmac before but I observe that it forces
the page dimensions (and offset) to fit, I think, A4 paper in portrait
format if they are not already set via the L, W, and O registers.  I
suspect that will need to change to work more smoothly with groff's
papersize.tmac macro file.

I may need to add a comment about this (in English :-/) to the
groff_mmse(7) page.

In the meantime a good way to render documents requiring mmse will be as

$ groff -dpaper=a4 -mm -mmse -P -p -P a4

If a different paper format is desired, setting the aforementioned
command-line registers will be important, so add the following flags.

  -rLxx -rWyy -rOzz

...where xx is the paper length, yy the line length, and zz the page
offset.  Use of scaling units ('c' for centimeters will be common, I
reckon) is recommended.

I'm attaching my own reproducer for your convenience.  Its mostly
equivalent to yours.


Description: application/troff-mm

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