MFC r359680: mail/gprof/tip: tap with the ugly stick

The ugly stick here is this bit in the respective headers:

#ifndef EXTERN
#define EXTERN extern
#endif

with a follow-up #define EXTERN in a single .c file to push all of their
definitions into one spot. A pass should be made over these three later to
push these definitions into the correct files instead, but this will suffice
for now and at a more leisurely pace.

Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add const to the copyright variable
Bump WARNS to level 2

Touch up some more small typos missed in the previous round.

Reported by: Ben Kaduk <minimarmot@gmail.com> et al.

Spelling fixes for usr.bin/

In usr.bin/mail/cmd1.c, use the correct printf length modifier for a
ptrdiff_t. In usr.bin/mail/main.c, cast a field width to int.

MFC after: 1 week

Add __unused. Ansi prototypes.

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

Use static storage-class specifier where appropriate.
Found by: CScout

Sync usage screen with manpage.

MFC after: 5 days

Add the -e (mail presence test), -H (header summary mode), and -F
(message save as first recipient) options for standards
conformance.

Submitted by: Wartan Hachaturow <wart@tepkom.ru> (with some changes)
PR: standards/61934

Consistently use FBSDID

Sync with most of NetBSD's changes, including:

*) Sync with 4.4BSD-Lite2
*) Set usecs for utimes()
*) Add 'inc' command and 'autoinc' option that check for new mail
manually and automatically, respectively
*) Use POSIX signal handling and tty semantics
*) Handle long lines correctly when paging messages
*) Add ability to explicitly search 'To:' line
*) Various manpage cleanups
*) Support overriding '~/.mailrc' with $MAILRC
*) Support 'askbcc' and 'asksub' options
*) Fix various bugs

Reviewed by: ru (mail.1)
Obtained from: NetBSD

Add the -E flag to not send messages that have an empty body. This is
useful for piping cron script error output by mail.

PR: bin/9494
Obtained from: NetBSD
MFC after: 2 weeks

Nuke unused variables.

Respect REPLYTO in mailrc.

PR: bin/8322
Submitted by: Philipp Mergenthaler <philipp.mergenthaler@stud.uni-karlsruhe.de>
MFC after: 2 weeks

Cleanup mail(1)'s varying styles by converting to using style(9).

Also take a stab at cleaning up BDECFLAGS and convert all uses of
NOSTR, NIL, NONE, NOVAR, NOGRP, NOGE to NULL. Also kill 'register' to
get diffs somewhat closer to OpenBSD/NetBSD.

There are no functional changes however.
Reviewed by: nra (visual inspection)

Merge various changes from OpenBSD and NetBSD.

o remove panic() in favor of err(3) and use err(3) functions
consistently throughout
o use stat(2)'s S_IS* macros rather than S_IF*
o [r]index -> str[r]chr
o convert some static buffers to dynamic ones
o use real tempfiles rather than reopening the same templates
o rename some functions that clash with libc
o convert wait_status from union to int and use wait(2) status macros
o fix multiple potential buffer overflows
o fix a few comments
o add $FreeBSD$

Reviewed by: nra, nectar (earlier version)

Ignore the MAIL environment variable when the -u flag is set.

PR: bin/8665

Teach boring old mail(1) about the use of the REPLYTO environment
variable which is de-facto standard for MUAs.

Teach bomail to generate an in-reply-to header so threading MUAs and
mail->news gateways won't lose context.

While i was at it, removed two gratuitous standard violations for
functions starting with an underscore.

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

Allow mail(1) to look for multiple mail.rc files.
Submitted-By: Lyndon Nerenberg VE7TCP <lyndon@orthanc.com>

Simplistic conversion of mail to use termios instead of sgtty.

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Usr.bin Sources