echo: fix lint error due to strict bool mode

No functional change.

With -Wall compiling this was giving:

echo.c: In function 'main':
echo.c:74:1: warning: control reaches end of non-void function

This raises 2 issues.

First, why with WARNS set to 6, which shoul

With -Wall compiling this was giving:

echo.c: In function 'main':
echo.c:74:1: warning: control reaches end of non-void function

This raises 2 issues.

First, why with WARNS set to 6, which should include just about
everything, was this not causing problems with everyday builds?
Surely falling off the end of a non-void function without returning
a specific value is one of the more basic errors that should be fixed.
(Whatever the name of the function). Is there a missing -Wxxx option?

And second, does C99 really promise:
Remove unnecessary call to exit(0); returning from main is equivalent
since C99.
in the sense that simply falling out of main() is exit(0)? Or is it
simply saying that the return value of main() is the exit status (which
has been true for much longer than since c99)?

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echo: clean up, increase WARNS to 6

Lint can handle __COPYRIGHT and __RCSID, so there is no need to hide
them anymore.

Use proper type 'bool' for nflag, ensure correct types via lint's strict
bool

echo: clean up, increase WARNS to 6

Lint can handle __COPYRIGHT and __RCSID, so there is no need to hide
them anymore.

Use proper type 'bool' for nflag, ensure correct types via lint's strict
bool mode.

Remove unnecessary call to exit(0); returning from main is equivalent
since C99.

No functional change.

show more ...

Catch up with /bin/sh built-in echo ... if a write error occurs,
don't just exit(1), write an error message to stderr as well
(required for POSIX conformance).

Drop main() prototype.

Check ferror(stdout) and exit(1) if there's been a problem.
Fixes PR bin/39574 from Ed Ravin, but with a simpler patch.

Remove the \n and tabs from the __COPYRIGHT() strings.

PR/38755: murray armfield: /bin posix programs missing setprogname and/or
setlocale

Put a few headers back so this compiles again.
Compile problems noticed by Dan Carosone.

Also remove headers that are no longer needed. Also pointed out by Mike
Small.

Remove unused variable stdout_ok, which was left over from my changes
in September. Pointed out by Mike Small in a private email.

Following private discussion with kleink@ and hubertf@ and public discussion
on tech-userlevel@, back out printescaped() functionality.
kleink: ``We sell rope.''

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

As discusses a little while back on tech-userlevel:

If stdout is a tty, use vis(3) to print any filenames to prevent garbage
from being printed if the filename contains control- or other non-printab

As discusses a little while back on tech-userlevel:

If stdout is a tty, use vis(3) to print any filenames to prevent garbage
from being printed if the filename contains control- or other non-printable
characters.

While here, sprinkle some EXIT_FAILURE and NOTREACHED where appropriate.

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ANSIfy, KNF. Parts from #13590 by Petri Koistinen.

lint

__RCSID()/__COPYRIGHT()/prototype police.

convert to new RCS id conventions.

Merge 4.4-Lite version.

Add RCS identifiers.

changed "Id" to "Header" for rcsids

added rcs ids to all files

initial import of 386bsd-0.1 sources