head: use getline() instead of fgetln()

This replaces fgetln() with getline(). The main reason for this is
portability, making things easier for people who want to compile these
tools on non-FreeBSD systems.

I appreciate that's probably not the top concern for FreeBSD base tools,
but fgetln() is impossible to port to most platforms, as concurrent
access is essentially impossible to implement fully correct without the
line buffer on the FILE struct. Other than this, many generic FreeBSD
tools compile fairly cleanly on Linux with a few small changes.

Most uses of fgetln() pre-date getline() support (added in 2009 with
69099ba2ec8b), and there's been some previous patches (ee3ca711a898
8c98e6b1a7f3 1a2a4fc8ce1b) for other tools.

Obtained from: https://github.com/dcantrell/bsdutils and
https://github.com/chimera-linux/chimerautils
Signed-off-by: Martin Tournoij <martin@arp242.net>
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/893

Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by: Netflix

usr.bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Mark usage function as __dead2 in programs where it does not return

In most cases, usage does not return, so mark them as __dead2. For the
cases where they do return, they have not been marked __dead2.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/735

Improve usability of head(1) and tail(1):

- Consistently support -q (quiet) and -v (verbose)
- Allow specifying numbers with SI prefixes supported by expand_number(3)
- Remove 2^31 limit on lines for head(1)

MFC after: 2 weeks
Reviewed by: lwhsu, pauamma, gbe
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D35720

fileargs_init() sets errno on failure.

Sponsored by: The FreeBSD Foundation

cap_fileargs: chase r346315, update fileargs_init in consumers

Reported by: ci.freebsd.org (8 times so far)
MFC after: 3 weeks
MFC with: r346315
Sponsored by: The FreeBSD Foundation

head: sandbox using capsicum

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D14409

head: fix style nits

No functional change intended.

Reviewed by: emaste
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D14498

head(1): Provide long options

Provide long options --bytes and --lines to match -c and -n respectively.
This improves head(1)'s compatibility with its GNU counterpart in a sensible
way.

Reviewed by: eadler (previous version)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D14139

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Fix build on architectures where off_t is signed by casting to uintmax_t
before comparing with a size_t.

Fix head -c ### where ### is greater than 2^31. Unlike the submitted
patch this uses off_t.

WARNSify and add $FreeBSD$ to Makefile.

PR: bin/107824
Submitted by: Brian Cornell <briancornell at earthlink dot net>
MFC after: 3 days

Remove duplicate __FBSDID() - spotted by trying to build with a non-GNU
compiler.

Consistently use FBSDID

Fix VCS tags; ANSIfy functions

1) Staticise.
2) Remove registers.
3) Change some ints to size_t which are used with fread/fwrite.

remove __P

Make usage message and man page synopsis reflect the fact that -n
and -c are mutually exclusive.

PR: 34233
Submitted by: Gary W. Swearingen <swear@blarg.net>
MFC after: 3 days

In order to perform faster when doing "head -n", use a pair of
fgetln/fwrite instead of getc/putchar, this seems about five times
faster.

change a global into a local, misc style fixes

$Id$ -> $FreeBSD$

fread() returns 0 on eof or error, not EOF. This fixes the following
bug:

"head -c <n>" never exit and loops forever (until it is killed),
if the input stream has fewer bytes than specified (n).

PR: bin/8225
Submitted-by: FUJIMOTO Kensaku <fujimoto@oscar.elec.waseda.ac.jp>

Setting eval to 1 after calling warn was the original behaviour.

Use err(3) instead of local redefinition.

Support for -c, byte count.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Merge from Lite2

Import some parts of CSRG 4.4BSD-Lite2 usr.bin sources to fix tree build.

first check the count and then get
the next line of characters and not cause it to first get
the characters even if the count (cnt) has become 0.

Submitted by: R Bezuidenhout <rbezuide@mikom.csir.co.za>

head(1) ignored EOFs (in certain cases).

Closes PR # bin/678: head(1) ignore EOF

Submitted by: wosch@cs.tu-berlin.de (Wolfram Schneider)

BSD 4.4 Lite Usr.bin Sources