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grep: factor test for \0 in grep patterns into a function
Factor the test for \0 in grep patterns into a function. Since commit
9ecedde ("Use kwset in grep", 2011-08-21) any pattern containing a
\0 is considered fixed as regcomp() can't handle it.
This change makes later changes that make use of either has_null() or
is_fixed() (but not both) smaller.
While I'm at it make the comment conform to the style guide, i.e. add
an opening "/*\n".
Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>
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