[tex-k] some garbage in "cannot \read from terminal"/"End of file on the terminal!" error

Hironori KITAGAWA h_kitagawa2001 at yahoo.co.jp
Sun Jul 18 21:32:22 CEST 2021

Hello all,

Hironobu Yamashita reported the following example,
which shows that some garbage "x ag _" is printed in the log (u.log).
$ cat u.tex

$ echo x | latex u | head -n5
This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2022/dev) (preloaded format=latex)
 restricted \write18 enabled.
entering extended mode
LaTeX2e <2021-06-01> patch level 1
$ grep '<read \*>' u.log
<read *> x ag _

I made a similar example for plain TeX.
$ cat v.tex
$ (for i in `seq 40`; do echo c; done) | tex v
This is TeX, Version 3.141592653 (TeX Live 2021) (preloaded format=tex)
(./v.tex! Emergency stop.
<read *> c^^Mo\temp\testB\rela

... (omitted, "End of file on the terminal!" in the log)

Yukimasa Morimi and I looked into these matter, and found that
the variable limit is not initialized when
  else fatal_error("*** (cannot \read from terminal in nonstop modes)")
  (module 484 in tex.web)
  if not input_ln(term_in,true) then fatal_error("End of file on the terminal!");
  (module 71 in tex.web)
I made a patch (to tex.ch) which initializes limit in these modules.

<h_kitagawa2001 at yahoo.co.jp>
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