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Improve safety in var imports from the environment.

Add a new var flag VUNSAFE - set on all vars imported from the environment.

Add setvareqsafe() (which is to setvareq() as setvarsafe() is to setvar())
and use that instead of setvareq() when processing the environment, so
errors don't cause the shell to abort.  Use VUNSAFE in that call.

Add flags arguments to all var callback functions which are used when setting
variables, and pass the flags given to the setvar*() functions to those
functions, so they can act differently in different situations (if desired).
Most of them just ignore the flags.

When unsetting a variable, call setvar() to clear things (and call the
callback function) both when the variable had a value which needs to be freed,
and when unsetting a variable which wasn't unset previously, so the VUNSET
flag can be seen by that callback func.

When setting HISTSIZE, use the flags passed to determine whether to ignore
bad values (if VUNSAFE) or treat them as an error.  This replaces the
earlier temporary hack to always ignore bad data there (histedit.c 1.68).

Miscellaneous associated minor changes.

These changes should largely be invisible in normal use.

Ooops, restore accidently removed files from merge mishap

Sync with HEAD

Arrange for set -o and $- output to be sorted, rather than more
or less random (and becoming worse as more options are added.)
Since the data is known at compile time, sort at compile time,
rather than at run time.

Resolve conflicts from previous merge (all resulting from $NetBSD
keywork expansion)

Command line, and "set" command options processing cleanup.

sh +c "command string"	no longer works (it must be -c)
sh +o   and   sh -o	no longer work (if you could call what they did
			before working.)  nb: this is without an option name.
-ooo Opt1 Opt2 Opt3	no longer works (set & cmd line), this should be
			-o Opt1 -o Opt2 -o Opt3   (same with +ooo of course).
-oOpt			is now supported - option value (name of option in
			this case) immediately following -o (or +o).
			(as with other commands that use std opt parsing)
			Both set comamnd and command line.

In addition, the output from "set +o" has shrunk dramatically, by borrowing
a trick from ksh93 (but implemented in a more traditional syntax).
"set +o" is required to produce a command (or commands) which when executed
later, will return all options to the state they were in when "set +o"
was done.  Previously that was done by generating a set command, with
every option listed (set -o opt +o other-opt ...) to set them all back
to their current setings.   Now we have a new "magic option" ("default")
which sets all options to their default values, so now set +o output
need only be "set -o default -o changed-opt ..." (only the options that
have been changed from their default values need be explicitly mentioned.)
The definition of "default value" for this is the value the shell set the
option to, after startup, after processing the command line (with any
flags, or -o option type settings), but before beginning processing any
user input (incuding startup files, like $ENV etc).

Anyone can execute "set -o default" of course, but only from a "set"
command (it makes no sense at all as a -o option to sh).   This also
causes "set +o" to be slightly more useful as a general command, as
ignoring the "set -o default" part of the result, it lists just those
options that have been altered after sh startup.  There is no +o default.
There isn't an option called "default" at all...

This causes some of the commented out text from sh.1 to become uncommented.

Implement the NETBSD_SHELL readonly unexportable unimportable
variable (with its current value set at 20160401) as discussed on
current-users and tech-userlevel. This also includes the necessary
support to implement it properly (particularly the unexportable
part) and adds options to the export command to support unexportable
variables. Also implement the "posix" option (no single letter
equivalent) which gets its default value from whether or not
POSIXLY_CORRECT is set in the environment when the shell starts
(but can be changed just like any other option using -o and +o on
the command line, or the set builtin command.) While there, fix
all uses of options so it is possible to have options that have a
short (one char) name, and no long name, just as it has been possible
to have options with a long name and no short name, though there
are currently none (with no long name).  For now, the only use of
the posix option is to control whether ${ENV} is read at startup
by a non-interactive shell, so changing it with set is not usful
- that might change in the future. (from kre@)

name the long option after the ksh name (trackall) to indicate the intended
posix behavior not the bash one.

update that -n is implemented and add -h using the long name that bash
uses. (from kre, long name from me)

Drop privileges when executed set{u,g}id unless -p is specified like other
shells do to avoid system() and popen() abuse.

Define an undocumented -F option to only use fork instead of vfork for
debugging purposes.

Catchup with rmind-uvmplock merge.

PR/45069: Henning Petersen: Use prototypes from builtins.h .

TOG require that 'set +o' output the options in a form suitable for
restoring them - make it so.

If 'set -o tabcomplete' it set, then bind <tab> to the libedit filename
completion function.
Note that the libedit code will probably want fine-tuning!
While editing the man page, add a note that non-whitespace IFS chars are
terminators and can generate null arguments.

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

Patches provided by Joel Baker in PR 22249, verified by myself.

Support command -p, -v and -V as posix
Stop temporary PATH assigments messing up hash table
Fix sh -c -e "echo $0 $*" -a x (as posix)
(agreed by christos)

Fixes from David Laight:
- ansification
- format of output of jobs command (etc)
- job identiers %+, %- etc
- $? and $(...)
- correct quoting of output of set, export -p and readonly -p
- differentiation between nornal and 'posix special' builtins
- correct behaviour (posix) for errors on builtins and special builtins
- builtin printf and kill
- set -o debug (if compiled with DEBUG)
- cd src obj (as ksh - too useful to do without)
- unset -e name, remove non-readonly variable from export list.
  (so I could unset -e PS1 before running the test shell...)

remove redundant declarations and nexted externs.

compile with WARNS = 2

Add -q option, which when used with -v and/or -x, turns off the tracing
during the execution of /etc/profile, .profile and $ENV.

Update /bin/sh from trunk per request of Christos Zoulas.  Fixes
many bugs.

Fix miscellaneous getopts problems:
- the 3 argument version of getopts would not reset properly
- OPTARG did not get cleared after a non argument option was found
- OPTIND was not set properly after a non argument option.

PR/2808: Remove trailing whitespace (from FreeBSD)

- Add getoptsreset to be used as a callback function when OPTIND is set.
  This is used to implement the POSIX behavior when OPTIND=1
- Call setvarsafe instead of setvar. If one ran
	"getopts optstr badvariable"
  where badvariable contained an illegal variable name, there was no way
  to recover, since setvar() would longjmp on the error.

Merge in my changes from vangogh, and fix the x=`false`; echo $? == 0
bug.

convert to new RCS id conventions.

Add RCS ids.

sync with 4.4lite

44lite code

Add RCS identifiers.

changed "Id" to "Header" for rcsids

added rcs ids to all files

initial import of 386bsd-0.1 sources

Initial revision