[bug #63074] [troff] support construction of arbitrary byte sequences in device control commands

[G. Branden Robinson]

Follow-up Comment #26, bug#63074 (group groff):

In my seat-of-the-pants example, I committed the same crime I complained of:
lack of input validation.  My point might be easier to understand if I add it
in.


.nr refno 1
.de DEFREF
.  nr refno +1
.  if !\A'\\$1' \
.    ab bogus tag '\\$1' in reference definition; stick to ASCII
.  ds ref*id!\n[refno]!tag \\$1
.  ds ref*id!\n[refno]!author \\$2
.  ds ref*id!\n[refno]!desc \\$3
.  ds ref*id!\n[refno]!year \\$4
..
.DEFREF story "Dupr\[e aa]" "Best \%Story\%Book Ever" 1989
.DEFREF Гуляйпольщина "Махновщина"
"весенне-летнего" 1919 \" gets rejected




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