MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

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.

No functional change intended.

MFC r328008:

units(1) free savescr in error condition too

CID: 978392

MFC r327578:

units(1): add missing ':' for two short arguments

PR: 209850

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

Bring a little more compability with GNU units 2.12
- notionally support a 'history file' flag. This doesn't do much now,
but is there to prevent scripts written against GNU units from
breaking
- correctly gracefully quit rather than exit (this will make it easier
to support a history file in the future)
- remove the "t" flag from fopen which was there to support windows. We
have not supported windows since at the latest, the introduction of
capsicum.

Rename units.lib -> definitions.units
- this matches GNU units 2.12
add ISO country codes from units 2.12

Remove pathnames.h
- it only holds a single constant
- it doesn't exist in the GNU variant

Fix interaction between libedit initialization and Capsicum
in units(1). The most visible is the removal of libedit warnings
about being unable to open termcap database.

Reviewed by: eadler@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3322

Only initialize libedit when necessary

The code path to support units conversions from the command line
need not initialize neither libedit nor the history. Therefore, only do
that when in interactive mode.

This hides the issue reported in PR bin/201167 whereby running commands
of the form 'echo "$(units ft in)"' would corrupt the terminal. The real
issue causing the corruption most likely still remains somewhere.

PR: bin/201167
Differential Revision: D2935
Reviewed by: eadler

units(1): Add support for output-format
Add support for the output-format argument. This also exposes subtle
rounding differences between GNU units and our units.

units(1): Clean up
Remove unused constant. Add 'static' where able.

units: Support start of line comments with '#'
Modern GNU units(1) supports comments anywhere with '#' but take the easy route for now and at least support start of line # comments.

units(1): Add 'terse' support
terse output is used when calling units from another script.

units(1): Add 'help' flag
- Add support for --help for compatibility
- Make usage() static

units(1): add long options
Things brings additional compatibility with units 2.10

Discussed with: wblock (man page)

units(1): Fix minor typos

Obtained From: DragonflyBSD

units(1): call el_end()

Add missing el_end() call

units(1): unbreak -f option, fix some style, increase compatibility.

- Unbreak the -f option: it was missing a ':'
- gunits -V spits out more information than just its version: attempt to do so
as well.

units(1): use common functions

No need to replicate strdup

units(1): don't compare pointers with 0

For better readability, don't compare pointers with 0 or assign 0
to them. Use NULL instead.

Inspired by: DragonflyBSD

units(1): Add 'static' and sort list.

Inspired by: DragonflyBSD

units(1): Add v option: verbose

For increased compatibility with GNU units: support a -v option which
produces more verbose output when spitting out the answer.
GNU -v does additional work in the version, information, and check output which
we do not (yet?) replicate.

units(1): Add U option

For increased compatibility with GNU units: support a -U option which tests for the
existence of the default units file and prints it to the screen.

units(1): support reading multiple units files

GNU units(1) supports reading up to 25 -f options. We support an arbitrary
number.

units(1): parse config file after setting defaults

Parse the config file after setting the defaults to permit the user to change
things (e.g., editing mode)

units(1): add libedit support

Add line editing and history support to units(1) via libedit.

Reviewed by: bdrewery

units(1): make -V print version instead of -v

The units program is likely little used. It is even less likely that a script
will want the units program to print out its version number by passing -v.

GNU units uses -V for version and -v for verbosity.

Increase compatibility between these two versions (written by the same author)
by switching our flag as well.

Take this opportunity to remove bogus information about the version number and
just call it 'FreeBSD units'.

Discussed with: cperciva, rwatson

add capsicum to units(1)

Add missing static keywords to units(1)

Add limited support for units that are related by affine rather
than linear relations. We can now convert degC to degF.

586 units, 56 prefixes
You have: 24 degC
You want: degF
75.2
You have: degC
You want: K
(-> x*1 +273.15)
(<- y*1 -273.15)

Add enough consts to keep everyone happy.

Add prototypes and turn on WARNS=?2.

Give units a bit of a cleanup:

1) Fix a bug where the recursion on prefixes where if recusrion failed
then the next attempt started too far along the string.
2) Up some internal limits that we were about to hit off.
3) Change the constness and signedness of some things and complete missing
prototypes.
4) Remove the readerror function 'cos it could print out the wrong
wrong file name. Replace it with more useful error messages.
5) Use sizeof when passing buffers to fgets.
6) Warn about empty prefix definitions.

Reviewed by: iedowse

Don't segv when trying to add a 0-length unit name.
Some string-related cleanups inspired by OpenBSD.

Reviewed by: asmodai

$Id$ -> $FreeBSD$

Use err(3). Cosmetic in usage(). Rewrote man page in mdoc format.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fix exit code when used in non-interactive mode.
Remove ';' typo attached to if statement.

This commit was generated by cvs2svn to compensate for changes in r16186,
which included commits to RCS files with non-trunk default branches.

Units conversion utility courtesy of NetBSD.

Submitted by: Jeremy Prior
Obtained from: NetBSD