CVS log for src/usr.bin/env/env.c

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Pull up following revision(s) (requested by kim in ticket #993):

	usr.bin/env/env.1: revision 1.16
	usr.bin/env/env.c: revision 1.24

Implement "env -C dir" to chdir

Use err(3) to expose errno(2) if chdir(2) (or unsetenv(3)) fails.

Implement "env -C dir" to chdir

Use err(3) to expose errno(2) if chdir(2) (or unsetenv(3)) fails.

Merge changes from current as of 20200406

Implement env(1) -0

-0      End each output line with NUL, not newline.

FreeBSD and GNU env(1) implement -0 which is used in 3rd party scripts.

This change is based on the FreeBSD code.

Add CVS Id tag and switch __attribute__ to __dead.

Implement env(1) -u

The option '-u name' causes removal of the name environment variable if
it is in the environment.  This is similar to the unset command in sh(1).
The value for name must not include the '=' character.

Add HISTORY section in the man page.

The -u argument is implemented by Linux, FreeBSD and Darwin.
The lack of -u in NetBSD is a cause for a frequent fallout in the LLVM
toolchain test-suite.

minor KNF nits.

Do use putenv(3) to handle the provided strings directly, instead of
setenv(3) which need string splitting and later reassembly.

remove duplicate 'was' in a comment

Sync with wrstuden-revivesa-base-2.

Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.

de-__P, add ANSI prototypes, and a teeny bit of KNF.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

fix nested extern

Don't declare 'extern opt*' getopt variables.

Pull up to last week's -current.

revert previous

remove superfluous '-' in getopt string

WARNSify, fix .Nm usage

Include appropriate header files to bring prototypes into scope.
Removed explicit errno declarations.

Merge and Sync with 4.4BSD-Lite2
Mostly looks like the previous NetBSD version, actually -- only minimal
Lite2 stigmata preserved although I started with Lite2. Mostly the changes
were things like index->strchr and the rest was NetBSD code.

imported from 44lite2

Provide prototypes in static function declarations.

POSIX.2 utilities must call setlocale(LC_ALL, "");

simplify error message handling by using err() function.

Minor tweaks: including header files to bring prototypes into scope,
explicitly declaring function return values, etc. to make gcc -Wall
shut up.

Add RCS identifiers.

Make Posix 1003.2 (Draft 11.2) compliant.

initial import of 386bsd-0.1 sources

Initial revision