Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Part of r245761 makes "grep -D skip" broken for pipes, i.e.
echo xxx | grep -D skip xxx
returns nothing. Instead of just removing added S_ISFIFO condition
(originally absent in this version of grep), make it work as latest
GNU version does: don't skip directories and devices if fd == STDIN_FILENO.

grep: change some int types.

Change several int variables to size_t, ssize_t, or ptrdiff_t.
This should fix the bug described in CVE-2012-5667 when an input
line is so long that its length cannot be stored in an int
variable.

This is based on NetBSD's revision which says:

This change to NetBSD's version of GNU grep 2.5.1 (licenced under
GPLv2) was made without direct reference to any code licenced
under GPLv3.

Obtained from: NetBSD
MFC after: 3 days

Make "-D skip" option work with FIFO by opening file in non-blocking mode.

Reviewed by: jhb
Tested by: delphij

Remove redundant string length check from the previous commit.

Fix a longstanding buglet in bz-prefixed grep(1).

Removed redundant (and incorrect) code in prline. Fixes grep -i --color "",
among other things.

PR: 79063
Obtained from: Fedora (Tim Waugh)

Fix background colour problems with --color output (RH bug #138913).

Obtained from: Karsten Hopp via Fedora

Remove mb-caching hack.

Obtained from: Fedora (Tim Waugh)

Fix regression in output with -R compared to previous version.

PR: 77466
Submitted by: Andre Guibert de Bruet <andy@siliconlandmark.com>

Make grep run much (~10x) faster in multibyte locales by caching the wide
character representation of input data across calls to dfaexec(), and by
caching the lengths of character across calls to check_multibyte_string().

Obtained from: Fedora (Tim Waugh)

Improve case-insensitive matching in multibyte locales.

Obtained from: Isamu Hasegawa (IBM) via Fedora

Merge local changes.

Merge conflicts, upgrade

Allow -J to simultaneously do non-bzip2 grepping.
Don't allow -J and -Z together.

Partially submitted by: knu

Create bzgrep.

Restore backwards compatible -R option.
Broken in revision 1.17.

Noticed by: hoek

Merge FreeBSD changes into 2.4d.

Fix conflicts.

* Make --null option work in (HAVE_LIBZ > 0) case.
* Remove "why we need this decl..." comment. The `matcher' variable
is defined in *grepmat.c files in the original distribution, which
we did not import.

Merge FreeBSD chagnes into GNU grep 2.4.

Support the environtmental var "GREP_OPTIONS". Which can hold a set of
default options for diff. These options are interpreted first and can be
overwritten by explicit command line parameters.

Obtained from: GNU Grep 2.3h

Alias -R to -r for backward compatibility.

Submitted by: ru
Requested by: wosch

Set default matcher from argv[0].

Merge FreeBSD changes into 2.3:
* revs 1.9-10 - built-in decompression using zlib(3) library

FreeBSD changes OBE'ed by 2.3:
* rev 1.7 - our "-q" flag. Use "-L" or "-l" now.
* revs 1.{4,6} - colleate, and with correct LC_ type.
* rev 1.3 - remove trailing whitespace.

Submitted by: ru

Back out the botched attempt to update to gnu grep 2.3 (lots of history
was lost). Restore original version to try and avoid breaking the build
while David O'brien does a proper set of imports and merges.

Requested by: obrien