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Revision 1.1, Wed Apr 13 13:19:36 2022 UTC (2 years, 2 months ago) by schwarze
Branch: MAIN
CVS Tags: HEAD 

Surprisingly, groff supports multiple copy mode escapes at the
beginning of an escape sequence: \, \E, \EE, \EEE, and so on all do
the same outside copy mode, so let them do the same in mandoc(1), too.

This fixes an assertion failure triggered by \EE*X that tb@ found
with afl(1).  The first E was consumed by roff_expand(), but that
function failed to recognize the escape sequence as the expansion
of a user-defined string and handed it over to mandoc_escape(),
which consumed the second E and then died on an assertion because
it is not prepared to handle user-defined strings.  Fix this by
letting *both* functions handle arbitrary numbers of 'E's correctly.

ESC-E(1)                    General Commands Manual                   ESC-E(1)

NNAAMMEE
     eesscc--EE - copy-mode escaping of backslashes

DDEESSCCRRIIPPTTIIOONN
     initial text

     string expansion: myval myval myval myval

     output device: ascii ascii ascii ascii

     numerical expression test: 1 0 1 0

     register: 1 2 3 3

     special character: <= >= << >>

     final text

OpenBSD                         April 13, 2022                         OpenBSD