FreeBSD/src 0805158 (r322609)contrib/netbsd-tests/usr.bin/grep t_grep.sh, usr.bin/grep util.c

MFC r318571: bsdgrep: emit more than MAX_LINE_MATCHES per line

We should not set an arbitrary cap on the number of matches on a line,
and in any case MAX_LINE_MATCHES of 32 is much too low.  Instead, if we
match more than MAX_LINE_MATCHES, keep processing and matching from the
last match until all are found.

For the regression test, we produce 4096 matches (larger than we expect
we'll ever set MAX_LINE_MATCHES) and make sure we actually get 4096
lines of output with the -o flag.

We'll also make sure that every distinct line is getting its own line
number to detect line metadata not being printed as appropriate along
the way.

PR:             218811
Approved by:    emaste (mentor, blanket MFC)
DeltaFile
+23-7usr.bin/grep/util.c
+21-0contrib/netbsd-tests/usr.bin/grep/t_grep.sh
+44-72 files

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