bin: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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/

sh: Fix rare memory leak with SIGINT

If getcwd() failed earlier on but later succeeded in the pwd builtin,
there was no INTOFF protection between calling savestr() and storing its
result.

It is quite rare for getcwd() to fail, and rarer for it to succeed later in
the same directory.

Found via code inspection for changing ckmalloc() and similar to assert
INTOFF protection instead of applying it directly (which protects against
corrupting malloc's internal state but allows memory leaks or double frees).

MFC after: 1 week

sh: Don't treat % specially in CDPATH

sh: Ignore error when cd writes the directory actually switched to.

If CDPATH is used non-trivially or the operand is "-", cd writes the
directory actually switched to. (We currently do this only in interactive
shells, but POSIX requires this in non-interactive shells as well.)

As mentioned in Austin group bug #1045, cd shall not return an error while
leaving the current directory changed. Therefore, ignore any write error.

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

sh: Remove a global variable from cd.c.

sh: Use OLDPWD shell variable for 'cd -'.

Per POSIX, 'cd -' should use the OLDPWD shell variable, not internal state.
This variable is normally exported.

Also, if OLDPWD is not set, fail 'cd -' instead of changing to the current
directory.

sh: Prefer "" to nullstr where possible.

sh: Add stsavestr(), like savestr() but allocates using stalloc().

sh: Prefer memcpy() to strcpy() in most cases. Remove the scopy macro.

sh: Prefer internal nextopt() to libc getopt().

This reduces code duplication and code size.

/usr/bin/printf is not affected.

Side effect: different error messages when certain builtins are passed
invalid options.

sh: Properly show "Not a directory" error in cd builtin.

The errno message display added in r222292 did not take attempting to
cd to a non-directory or something that cannot be stat()ed into account.

PR: bin/164070
MFC after: 10 days

sh: Fix duplicate prototypes for builtins.

Have mkbuiltins write the prototypes for the *cmd functions to builtins.h
instead of builtins.c and include builtins.h in more .c files instead of
duplicating prototypes for *cmd functions in other headers.

sh: Correct criterion for using CDPATH in cd.

CDPATH should be ignored not only for pathnames starting with '/' but also
for pathnames whose first component is '.' or '..'.

The man page already describes this behaviour.

sh: Show errno messages in cd.

sh: Implement the cd -e flag proposed for the next POSIX issue.

This reflects failure to determine the pathname of the new directory in the
exit status (1). Normally, cd returns successfully if it did chdir() and the
call was successful.

In POSIX, -e only has meaning with -P; because our -L is not entirely
compliant and may fall back to -P mode, -e has some effect with -L as well.

sh: Add a function to print warnings (with command name and newline).
This is like error() but without raising an exception.
It is particularly useful as a replacement for the warnx macro in
bltin/bltin.h.

sh: Code size optimizations to "stack string" memory allocation:
* Prefer one CHECKSTRSPACE with multiple USTPUTC to multiple STPUTC.
* Add STPUTS macro (based on function) and use it instead of loops that add
nul-terminated strings to the stack string.

No functional change is intended, but code size is about 1K less on i386.

sh: Fix confusing behaviour if chdir succeeded but getcwd failed in cd -P.

If getcwd fails, do not treat this as an error, but print a warning and
unset PWD. This is similar to the behaviour when starting the shell in a
directory whose name cannot be determined.

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

In the spirit of r90111, depend on c89 and remove the "STATIC" macro
and its usage.

Consistently use "STATIC" for all functions in order to be able to set
breakpoints with in a debugger. And use naked "static" for variables.

Noticed by: bde

Merge r199631: Handle current work directories of arbitrary length.

sh: On startup of the shell, use PWD from the environment if it is valid.
Unset PWD if it is incorrect and no value for it can be determined.
This preserves the logical current directory across shell invocations.

Example (assuming /home is a symlink):
$ cd
$ pwd
/home/foo
$ sh
$ pwd
/home/foo

Formerly the second pwd would show the physical path (symlinks resolved).

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.

sh: Various warning fixes (from WARNS=6 NO_WERROR=1):
- const
- initializations to silence -Wuninitialized (it was safe anyway)
- remove nested extern declarations
- rename "index" locals to "idx"

sh: Constify various strings.

Most of this is adding const keywords, but setvar() in var.c had to be
changed somewhat more.

Handle current work directories of arbitrary length. The argument to cd
continues to be limited by PATH_MAX (1024).

Obtained from: NetBSD
PR: 104456

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

Split updatepwd() into two smaller functions. The first one, findpwd(),
computes the new path and the second one, updatepwd(), updates the variables
PWD, OLDPWD and the path used for the pwd builtin according to the new
directory. For a logical directory change, chdir() is now called between
those two functions, no longer causing wrong values to be stored in PWD etc. if
it fails.

PR: 64990, 101316, 120571

Don't strip a leading ./ from the path for the cd builtin to avoid interpreting
.//dir as /dir. Rather strip it only for the purpose of checking if the
directory path should be printed.

PR: 88813
Submitted by: Josh Elsasser
Patch from: NetBSD (cd.c rev 1.38)
MFC after: 2 weeks

Remove clause 3 from the UCB licenses.

OK'ed by: imp, core

Changes following CScout analysis:

- Removed dead declarations
- Made objects that should have been declared as static, static.

The changes use STATIC instead of static, following the existing
convention in the rest of the code.

Approved by: schweikh (mentor)
MFC after: 2 weeks

Add a -P/-o physical option which behaves similarly to bash/ksh's options
by the same name. This option makes the cd and pwd builtins behave physically
(as opposed to logically) by default.

Submitted by: fanf

Set opterr to zero to avoid duplicate warnings from getopt(3) for unknown
options.

Use PATH_MAX instead of a local guess at it, which happened to be incorrect.

Suggested by: fanf

pwdcmd()'s argc and argv arguments are no longer unused, remove __unused.

Pointed out by: fanf

Remove broken and incomplete support for old releases of System V,
don't support system that implement getcwd(3) with a pipe to /bin/pwd.

Consistently use FBSDID

Bring back the cd -L and -P options from revision 1.24, but try harder not
to fail when the logical current directory no longer exists. Allow changes
to absolute paths when logical cwd is invalid, fall back to physical cd
if logical cd fails.

Temporarily back out revision 1.24; it seems to handle the case where the
current directory no longer exists incorrectly and breaks `make cleandir'.

Add the SUSv3 -L and -P options to the cd and pwd builtin utilities. `Logical'
handling of .. is now the default.

Remove a small, annoying, nit I ran in to editing this file, a lone tab
on a line by itself.

o __P has been reoved
o Old-style K&R declarations have been converted to new C89 style
o register has been removed
o prototype for main() has been removed (gcc3 makes it an error)
o int main(int argc, char *argv[]) is the preferred main definition.
o Attempt to not break style(9) conformance for declarations more than
they already are.
o Change
int
foo() {
...
to
int
foo(void)
{
...

Don't call setvar() with the VTEXTFIXED flag. A copy is created by
setvar() and passed to setvareq(). When the VTEXTFIXED flag is set,
that copy is never freed, causing a memory leak.

PR: 31533
Submitted by: maxim@macomnet.ru

Include strerror(errno) in error messages after failed system calls.
Fix a warning.

$Id$ -> $FreeBSD$

Don't blindly eliminate `..' and the previous pathname component.
PR: 2541
Obtained from: NetBSD

Add rcsid. Spelling.

Use the __unused attribute where warranted.

Nuke register keyword usage and #if -> #ifdef.

Obtained from: NetBSD

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.

Make sh(1) think and be in the same place at the same time. This closes
PR#2331: strange output of sh's pwd on symlinked directories.

Oops, it needs little more caulk to get it right.

Apply a little dab of bit caulk to keep those beggars
from leaking out.

Noticed by: bde

Don't use _POSIX_PATH_MAX to limit the size of the path, instead
use 'getcwd(NULL, 0)' just as pwd(1) does.

Suggested by: bde

Make sh(1) a little braver in the face of adversity. sh(1)
now handles the getpwd() init problem the same way as bash
and ksh do. Also while I was in here, I cleaned up the format
a little, removed some unnnecessary #if SYMLINKS cruft, and
changed the pwd builtin to use getcwd(3) as Joerg suggested.

Merge in NetBSD mods and -Wall cleaning.

Obtained from: NetBSD, me

Merge of 4.4-Lite2 sh source, plus some gcc -Wall cleaning. This is a
merge of parallel duplicate work by Steve Price and myself. :-]

There are some changes to the build that are my fault... mkinit.c was
trying (poorly) to duplicate some of the work that make(1) is designed to
do. The Makefile hackery is my fault too, the depend list was incomplete
because of some explicit OBJS+= entries, so mkdep wasn't picking up their
source file #includes.

This closes a pile of /bin/sh PR's, but not all of them..

Submitted by: Steve Price <steve@bonsai.hiwaay.net>, peter

Import the 4.4BSD-Lite2 /bin/sh sources

Requested by: joerg

(Note, this is mostly going to be conflicts, which is expected. Our entire
sh source has a mainline, so this should not change anything except for
a few new files appearing. I dont think they are a problem)

A fix for the "cd -" coredump on a brand new /bin/sh. The problem was
noticed on a NetBSD bugs mailing list but this is entirely my own work.

Inspired by: Scott Reynolds <scottr@plexus.com>, for NetBSD

Obtained from: partly from 1.1.5

Convert "" to "." for "cd" and "cd ''". chdir("") is required to fail
on POSIX systems.

Get this braindead, mongoloid shell look in /stand for pwd if it can't
find it in /bin. This is something of a kludge, I know, but consider
my limited alternatives: I can't make this an execvp() without making
people scream that I introduced a failure point or slowed down pwd,
and I can't make it an optional macro since crunch doesn't let you pass
arbitrary command-line args to the build of one of its crunch-ees.
This is the simplest, if not the nicest looking, solution I could come up
with.

Added $Id$

BSD 4.4 Lite bin Sources