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struct as an argument such that after copy-in, it can call roff_expand()
once again, which used to be called roff_res() before this. This
fixes a subtle low-level roff(7) parsing bug reported by Fabio
Scotoni <fabio at esse dot ch> in the 4.4BSD-Lite2 mdoc.samples(7)
manual page, because that page used an escaped escape sequence in
a macro argument.
To expand escaped escape sequences in quoted mdoc(7) arguments, too,
stop bypassing the call to roff_getarg() in mdoc_argv.c, function args()
for this case. This does not solve the case of escaped escape sequences
in quoted .Bl -column phrases yet.
Because roff_expand() can make the string longer, roff_getarg() can no
longer operate in-place but needs to malloc(3) the returned string.
In the high-level parsers, free(3) that string after processing it.
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combinations are handled, and are handled in a systematic manner.
This resolves some erratic duplicate handling, handles a number of
missing cases, and improves diagnostics in various respects.
Move validation of .br and .sp to the roff validation module
rather than doing that twice in the mdoc and man validation modules.
Move the node relinking function to the roff library where it belongs.
In validation functions, only look at the node itself, at previous
nodes, and at descendants, not at following nodes or ancestors,
such that only nodes are inspected which are already validated.
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It is not broken because of \), which is correctly implemented, but
the addition merely reveals a hidden bug elsewhere, almost certainly
in \\ handling. Given that \\ is among the most mysterious escape
sequences and using it is very strongly discouraged in manual pages,
fixing that is not urgent - and may be hard.
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that are not syntax mistakes and that do not cause wrong formatting
or content to style suggestions.
Also upgrade two warnings that may cause information loss to errors.
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causes horrible churn anyway, profit of the opportunity to stop
excessive testing, such that this is hopefully the last instance
of such churn. Consistently use OpenBSD RCS tags, blank .Os,
blank fourth .TH argument, and Mdocdate like everywhere else.
Use -Ios=OpenBSD for platform-independent predictable output.
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and operating system dependent messages about missing or unexpected
Mdocdate; inspired by mdoclint(1).
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Both kristaps@ and wiz@ repeated asked for this,
literally for years.
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