K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2016-08-02T20:25:22.398725Z
K 7
svn:log
V 440
Fix a segfault in bsdgrep when parsing the invalid extended regexps "?"
or "+" (these are invalid, because there is no preceding operand).

When bsdgrep attempts to emulate GNU grep in discarding and ignoring the
invalid ? or + operators, some later logic in tre_compile_fast() goes
beyond the end of the buffer, leading to a crash.

Fix this by bailing out, and reporting a bad pattern instead.

Reported by:	Steve Kargl
MFC after:	1 week

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