[bug #65930] [me] large values of register `tv` cause infinite trap recursion

[G. Branden Robinson]

Update of bug #65930 (group groff):

                  Status:               Need Info => Confirmed              

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Follow-up Comment #17:

Okay, well, my patch from comment #2 seems to be impotent to resolve the
problem reported in comment #0.


$ cat ATTIC/stack-limit.me
.mso e.tmac
.br
.nr $v 421
$ sed -n '/\.de @t/,+10p' tmac/e.tmac
.de @t                  \" --- output header or footer title
.if !\\n(?h \
\{\
.       \" Temporarily set vertical spacing to zero so `sz` doesn't
.       \" spring the footer trap again in infinite regress.
.       nr _t \\n(tv
.       nr tv 0
.       sz \\n(tp\"             \" set header/footer type fonts, etc.
.       @F \\n(tf
.       lt \\n(_Lu              \" make title span entire page
.       if \\n(?n \
$ ./build/test-groff -abww ATTIC/stack-limit.me 
<beginning of page>
troff: backtrace: '/home/branden/src/GIT/groff/build/../tmac/e.tmac':1507:
macro 'sz'
troff: backtrace: '/home/branden/src/GIT/groff/build/../tmac/e.tmac':470:
macro '@t'
troff: backtrace: '/home/branden/src/GIT/groff/build/../tmac/e.tmac':458:
macro '@e'
troff: backtrace: '/home/branden/src/GIT/groff/build/../tmac/e.tmac':405:
trap-called macro '@f'
troff: fatal error: input stack limit exceeded (probable infinite loop)


Back to the drawing board, I reckon.


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