libexec: 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

Remove $FreeBSD$: one-line .c pattern

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

getty: code cleanup, part 2

* Clean up whitespace
* Reindent

Sponsored by: Klara, Inc.

getty: code cleanup, part 1

* Avoid unnecessary use of `unsigned char *`
* Use explicit casts when assigning `unsigned char *` to `char *` or vice versa
* Drop unused global variables (and fix memory leak in `gettable()`)
* Use `snprintf()` instead of `strcpy()` + `strcat()`
* Drop spurious braces in switch

Sponsored by: Klara, Inc.
Obtained from: Apple OSS Distributions (in part)
Differential Revision: https://reviews.freebsd.org/D37263

Fix potential buffer overflow and undefined behavior.

The buffer allocated in read_chat() could be 1 element too short, if the
chatstr parameter passed in is 1 or 3 charachters long (e.g. "a" or "a b").
The allocation of the pointer array does not account for the terminating
NULL pointer in that case.

Overlapping source and destination strings are undefined in strcpy().
Instead of moving a string to the left by one character just increment the
char pointer before it is assigned to the results array.

MFC after: 2 weeks

Build getty(8) with WARNS=6.

Reviewed by: imp@
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14197

In libexec/getty/chat.c, replace && with & in chat_send(). The intent
is to test if the CHATDEBUG_SEND bit is set in the chat_debug global.

MFC after: 1 week

Add __unused. Ansi prototypes.

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.

Include gettytab.h before extern.h so that the declarations of struct
gettyflags, gettynums and gettystrs are available.

Fixed a misspelling of 0 as NULL.

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/
Add FreeBSD Id tag where missing.

Removed unused include of <sys/resource.h> instead of depending on
namespace pollution only 1 layer deep in <sys/stat.h> for its
prerequisite <sys/time.h>

Removed other unused includes.

o __P removal
o remove register
o use strict prototypes

$Id$ -> $FreeBSD$

Correct incompletes .Xrs. Remove duplicate #includes and unused variables.

Use cgetustr() since we handled special escapes ourselves.
Fix typo in escape parsing function.
PR: 4370
Submitted by: sumii@is.s.u-tokyo.ac.jp

Revert $FreeBSD$ to $Id$

Tidy-up modem-chat handling: ensure tty modes are restored to
'sane' standard (not raw) settings before abort/exiting; move
responsibility of setting raw mode for chat-handling out of
chat.c to avoid doing redundant tc{s,g}etattr()s; move DE
pause prior setting standard mode before issue/login prompt to
avoid echoing modem connect strings. Fixed up comment styles
in a couple of places.

Added:
ic=expect/send script modem init script
ac=expect/send script modem answer script
ct#val chat script timeout (seconds)
rt#val recycle timeout (seconds) if 'ac' set
dc#val debug bitmask for debugging chat scripts
hw (boolean) enable crtscts handshaking
if=path 'issue' file sent prior login prompt

chat.c is a simplistic expect/send chat module.