MFC r344677: patch(1): Exit successfully if we're fed a 0-length patch

This change is made in the name of GNU patch compatibility. If GNU patch is
fed a zero-length patch, it will exit successfully

MFC r344677: patch(1): Exit successfully if we're fed a 0-length patch

This change is made in the name of GNU patch compatibility. If GNU patch is
fed a zero-length patch, it will exit successfully with no output. This is
used in at least one port to date (comms/wsjtx), and we break on this usage.

It seems unlikely that anyone relies on patch(1) calling their completely
empty patch garbage and failing, and GNU compatibility is a plus if it helps
with porting, so make the switch.

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patch(1): make some macros look boolean.

Similar to r306560, plus remove an unused macro.

Suggested by: jmallett

patch(1): make some macros look boolean.

Minor cleanup inspired by a new patch(1) variant in schily tools.

For reference:
https://sourceforge.net/p/schillix-on/

MFC after: 1 week

Remove automatic checkout feature.

Obtained from: DragonFly via OpenBSD
Relnotes: yes
MFC: never

Fix shell injection vulnerability in patch(1) and drop SCCS
support by replacing system() with execve().

Future revisions may remove the functionality completely.

Obtained from: Bitrig
Security: CV

Fix shell injection vulnerability in patch(1) and drop SCCS
support by replacing system() with execve().

Future revisions may remove the functionality completely.

Obtained from: Bitrig
Security: CVE-2015-1416

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patch(1): avoid line number overflows

Introduce strtolinenum to properly check line numbers while parsing:
no signs, no spaces, just digits, 0 <= x <= LONG_MAX

Properly validate line ranges supplie

patch(1): avoid line number overflows

Introduce strtolinenum to properly check line numbers while parsing:
no signs, no spaces, just digits, 0 <= x <= LONG_MAX

Properly validate line ranges supplied in diff file to prevent overflows.
Also fixes an out of boundary memory access because the resulting values
are used as array indices.

PR: 195436
Obtained from: OpenBSD (CVS pch.c rev 1.45, 1,46, common.h rev 1.28)
MFC after: 1 week

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Various style(9) fixes and typos in grep, sort and patch.

MFC after: 3 days

- Refresh code with latest OpenBSD revisions.
- Remove $DragonFly$ tags as they are using git nowadays and VCS tags will
not help merging.
- Other changes to Copyright headers to make them consi

- Refresh code with latest OpenBSD revisions.
- Remove $DragonFly$ tags as they are using git nowadays and VCS tags will
not help merging.
- Other changes to Copyright headers to make them consistent with other
source code, we intend to fork from this point.

Reviewed by: pfg

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- Add a BSD-licensed patch, ported by Pedro F. Giffuni (pfg) from
DragonflyBSD and install it as bsdpatch. WITH_BSD_PATCH makes it
default and installs GNU patch as gnupatch.

Submitted by: pfg

- Add a BSD-licensed patch, ported by Pedro F. Giffuni (pfg) from
DragonflyBSD and install it as bsdpatch. WITH_BSD_PATCH makes it
default and installs GNU patch as gnupatch.

Submitted by: pfg
Obtained from: The DragonflyBSD Project

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Import of a BSD-licensed version of `patch', which will eventually
replace the version we currently have in src/gnu/usr.bin/patch/.
Among other things, this version includes a --posix option for str

Import of a BSD-licensed version of `patch', which will eventually
replace the version we currently have in src/gnu/usr.bin/patch/.
Among other things, this version includes a --posix option for strict
POSIX conformance.

This version is the current source from OpenBSD as of today. It is
their 3.5-release, plus a few updates to patch.c and pch.c that they
made about three weeks ago.

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Finish importing Lite2's src/usr.bin, except for ex, diff, grep, mail,
pascal and vmstat.sparc. All changed files on the vendor branch should
already have been imported.

BSD 4.4 Lite Usr.bin Sources