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

Use calloc() to get zeroed memory.

MFC after: 1 month

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

Change the behaviour of -F slightly; it now persists (forever) in
trying to open files rather than giving up when it encounters an
error. ENOENT errors are not reported.

As a result, files that are moved away then recreated are not at
risk of being 'lost' to tail. Files that are recreated and
temporarily have unreadable permissions will be shown when they
are fixed.

This behaviour is consistent with the GNU version of tail but
without the verbiage that goes with the GNU version.

This change also fixes error messages accompanying -f and -F.
They no longer report problems with (null)!

MFC after: 3 weeks

Nuking the temporary pointer once it is properly tracked in local storage.
This should fix the double free() bug where there's no tailing newline(\n)
character:

current# echo -n test | tail
testAssertion failed: (run->magic == ARENA_RUN_MAGIC), function
arena_dalloc, file /usr/src/lib/libc/stdlib/malloc.c, line 2448.
Abort (core dumped)

Reviewed by: kib
MFC after: 3 days

initialize variables, WARNS=6 compliant

Fix various memory leaks.

Submitted by: rdivacky
Obtained from: OpenBSD
MFC after: 1 week

Convert to ANSI style function definitions.

Revert part of the last commit. This fixes tail for pipes.

Submitted by: joerg

WARNS=2 fixes, use __FBSDID().

Remove register keyword usage with prejudice.
Modern compilers are smarter when it comes to allocating register
usage.

Properly constify some static arrays.

Also #if out some sccsid's and add rcsid's.

Dont forget to #include <err.h>

Argh! caught! *blush*.. This program was supplying it's own 'err' routine
which was slightly different to the libc one. To save any more cunfusion,
use the libc one.

one file somehow slipped by me in the previous commit
tidy up

when file can be opened for read but cannot be read from:
fail once (was twice) in forward case
fail once (was no times) in reverse case

this can happen when file is a directory on an NFS or procfs mount.

Another program depending on zero'ed malloc.

Submitted by: Kai Vorma <vode@snakemail.hut.fi>

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

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