Remove $FreeBSD$: one-line .c pattern

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

m4: Add -G option which reverses -g.

This matches GNU m4's -G / --traditional option, and although BSD m4 in non-GNU mode is not exactly identical to GNU mode in traditional mode, it's close enough.

Sponsored by: Klara, Inc.
Reviewed by: kevans, imp
Differential Revision: https://reviews.freebsd.org/D40697

m4: Support long options.

The option names are identical to those of the equivalent options in GNU m4, except of course for --gnu which does not exist in GNU m4.

While here, make the argument to -d / --debug optional, with the same default behavior as in GNU m4, and document it properly.

Sponsored by: Klara, Inc.
Reviewed by: kevans, imp
Differential Revision: https://reviews.freebsd.org/D40694

Import from OpenBSD: -E flag

Add -E flag (make warnings fatal), following the behavior of GNU m4 1.4.9+

Help and direction millert@ espie@ anton@ deraadt@

ok espie@

Obtained from: OpenBSD

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Synchronize m4(1) with OpenBSD

Synchronize with OpenBSD

Obtained from: OpenBSD

Sync with OpenBSD
This brings:
- check for integer overflows in custom allocs
- fix potential integer overflows in memory allocation
- annotate regexp error messages with source string
- better error handling in mkstemp/unlink/fdopen logic

Reduce diff with upstream.

More -Wmissing-variable-declarations fixes.

In addition to adding missing `static' keywords:
- bin/dd: Pull in `extern.h' to guarantee consistency with source file.
- libexec/rpc.rusersd: Move shared globals into an extern.h.
- libexec/talkd: Move `debug' and `hostname' into extern.h.
- usr.bin/cksum: Put counters in extern.h, as they are used by ckdist/mtree.
- usr.bin/m4: Move `end_result' into extern.h.
- usr.sbin/services_mkdb: Move shared globals into an extern.h.

Improve m4 compatibility with GNU m4 extension ** (exponent)

Submitted by: Marc Espie (espie@OpenBSD.org)
Approved by: des@ (mentor)

Synchronize with laster version of m4 from OpenBSD and NetBSD
This bring better compatibility with gnum4

Reviewed by: cognet
Approved by: cognet
Obtained from: OpenBSD, NetBSD

Mark global functions and/or variables in m4(1) static where possible.

This allows compilers and static analyzers to more thorough analysis.

Fix build of m4 with WARNS=6.

Change the parser; rename `exp' to `exponent' not to collide with exp(3).

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

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.

Store a pointer to "null" in struct ndblock's defn member instead of a
duplicate allocated on the heap; the address defn points to is significant,
and is checked against the address of "null" in certain conditionals.

PR: 59883
MFC after: 1 week

Respect locale settings from the environment.

Die on -D=foo, when parsing options - we can't let someone define (nil).

MFC after: 3 days

Kill extraneous whitespace.

Add a default case to the getopt(3) switch, remove a blank line nearby.

Functions declared as <type> <identifier>(<nil>) should be declared as
<type> <identifier>(<void-type>) in ANSI C.

Remove prototype for main().

Cast sp to uintptr_t when doing a compare of it to STACKMAX which is a size_t.

This messes up some indentation in mdef.h for some macros.

If a file operand cannot be processed, go on to process any remaining files
but exit non-zero.

Revert vendor identifiers, and #if 0 what is #if 0/#else for OpenBSD.

Add __FBSDID() properly.

Requested by: bde, mike

Remove redundant declarations of getopt(3) externals (since <unistd.h> does
take care of them), and add __FreeBSD__ to the defined() checks for the
_PATH_DIVNAME.

Merge local changes again, against ANSIfied m4(1).

Import OpenBSD m4(1) as of April 26. Mostly ANSIfication changes.

Crank WARNS.

Cast sizeof() to (int), as it's being compared against an int, not a size_t.
If i is changed to a size_t, it means the logic must be slightly changed later
in the flow, where --i is checked to be >= 0. I am not sure I want to make a
logic change to account for clearing up a warning, when an aesthetic one will
keep from modifying the logic.

Other harmless casts, that I think I've made in the right directions.

Make gpbc() an inline function, rather than an obfuscated macro, make its
scratch space local, rather than global. The previous macro used a dirty
hack (logical AND in place of a conditional) which would lead GCC to throw
a fit (rightly so) as the logical check, as well as the incrementation of
a variable, were not used for anything.

const'ify a few places where gcc3 yells. xstrdup() some global consts in
places where we xstrdup() when not using consts, but tried to assign them
to non-consts before.

Don't use execv(2) if we don't have the kind of arguments it wants.

Reviewed by: asmodai obrien tjr
Submitted by: tjr (a gcc3 build log)

Bring OpenBSD m4(1) off of the OPENBSD vendor branch, and add the -s option,
$FreeBSD$ identifiers, and fix initialisation to stderr to happen in a function
as stderr is not the same in CURRENT as in OpenBSD.

Reviewed by: obrien

This adds support for -s to the m4(1) utility, which causes #line directives
to be emitted as per the C preprocessor. It updates the manual page in
regards to standards accordingly.

PR: standards/36075
Submitted by: tjr
Reviewed by: mike
MFC after: 1 week

Import OpenBSD m4 as of today.

Remove the local basename in favor of the libc version.
Remove xmalloc and xstrdup and do the error checking at the place of use.

Clean up temporary file(s) and directory when m4 exits without falling
through main() (e.g., signals or calls to errx()).

PR: conf/25715

The secure temporary directory is always created, so always remove it.

Create temporary files in a secure directory, instead of using multiple
filenames based on a single invocation of mktemp() in /tmp, which is
easily predictable after the first one.

Audited by: markm

getopt and friends are declared in <unistd.h>
getopt returns -1 not EOF.

$Id$ -> $FreeBSD$

Use err(3) instead of local redefinition. Remove progname.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Remove trailing whitespace.

Make m4 more 8bit clean.
Don't use is*(EOF)
This fix core dump when LANG setted to 8bit wide charset
and ENABLE_STARTUP_LOCALE

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