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Differential D10420

bsdgrep trivial improvement: define REG_NOSPEC to be a no-op if not defined, use REG_NOSPEC instead of magic number
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Authored by kevans on Apr 18 2017, 2:50 PM.
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emaste
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rS317705: bsdgrep: avoid use of magic number for REG_NOSPEC
Summary

At the moment, glibc's cflags are not up to 0020 in value. Future proof this by using REG_NOSPEC directly and defining it to 0 for a no-op in other implementations where it's not defined.

Clearly we can define REG_NOSPEC differently if we pair bsdgrep with another regex(3) implementation that uses a different name, so this is the safe route.

Test Plan

Ensure no regressions with Kyua test suite

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Build Status
Buildable 8777
Build 9133: arc lint + arc unit

Event Timeline

kevans created this revision.Apr 18 2017, 2:50 PM
Harbormaster completed remote builds in B8776: Diff 27517.Apr 18 2017, 2:50 PM
kevans updated this revision to Diff 27518.Apr 18 2017, 2:53 PM
  • Fix line length
Harbormaster completed remote builds in B8777: Diff 27518.Apr 18 2017, 2:53 PM
kevans updated this revision to Diff 27519.Apr 18 2017, 2:54 PM
  • Apologies, typo
Harbormaster completed remote builds in B8778: Diff 27519.Apr 18 2017, 2:54 PM
emaste edited edge metadata.Apr 20 2017, 12:56 AM

I agree this is better than 0020. But maybe we should have GREP_FIXED be disabled if neither REG_NOSPEC or REG_LITERAL are defined?

Do we have positive and negative test cases for grep / fgrep / egrep already?

kevans added a comment.Apr 20 2017, 3:06 AM
In D10420#216375, @emaste wrote:

I agree this is better than 0020. But maybe we should have GREP_FIXED be disabled if neiter REG_NOSPEC or REG_LITERAL are defined?

I considered this, but I've never actually seen an implementation that defined REG_LITERAL -- after reading the commment, I assumed it was a typo since I couldn't find any history of a REG_LITERAL in FreeBSDs regex.h and I hadn't seen an implementation that used it. A quick Google search revealed that I was definitively wrong. =)

Should I use this method of #define REG_LITERAL 0 if not defined and just set cflags |= REG_NOSPEC | REG_LITERAL, or would it be cleaner to have two #ifdef blocks inline in this switch? I personally prefer the former, but if there's a precedent it would be good to follow it.

Do we have positive and negative test cases for grep / fgrep / egrep already?

Heh, well, not really. We don't actually even have a single test that uses fgrep/grep -F. egrep has a primitive test for basic branching functionality/matching escaped characters, but the rest of its inclusion was incidental, having come from the one of the PRs for general matching broken-ness with the -o flag.

We could still use improvement in this area. =)

kevans updated this revision to Diff 27574.Apr 20 2017, 2:25 PM
  • Error out at runtime on GREP_FIXED if literal expressions are not supported in regex(3)
Herald added a reviewer: transport. · View Herald TranscriptApr 20 2017, 2:25 PM
Harbormaster completed remote builds in B8810: Diff 27574.Apr 20 2017, 2:25 PM
kevans updated this revision to Diff 27575.Apr 20 2017, 2:26 PM

Other cruft snuck in despite a recent merge with -HEAD...

Harbormaster completed remote builds in B8811: Diff 27575.Apr 20 2017, 2:26 PM
kevans updated this revision to Diff 27576.Apr 20 2017, 2:27 PM

Grrr, arc's behavior with Git is not friendly. Diffs against origin/master, not master

kevans removed a reviewer: transport.Apr 21 2017, 2:27 PM
emaste added inline comments.May 2 2017, 9:05 PM
usr.bin/grep/grep.c
718

This won't work as DEFINED (upper-case) would be treated as a macro. We want #elif defined(), and I'll make the REG_NOSPEC case use defined() as well, for consistency.

emaste added inline comments.May 2 2017, 9:06 PM
usr.bin/grep/grep.c
721

also we want errx here - there is no errno to report.

Closed by commit rS317705: bsdgrep: avoid use of magic number for REG_NOSPEC (authored by emaste). · Explain WhyMay 2 2017, 9:08 PM
This revision was automatically updated to reflect the committed changes.

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usr.bin/
grep/
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Diff 27518

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usr.bin/grep/grep.c

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