Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

top: display battery capacity remaining

Submitted by: Antranig Vartanian <antranigv@freebsd.am>
Reviewed by: imp, philip
Differential Revision: https://reviews.freebsd.org/D22871

Merge ^/head r352537 through r352586.

top(1): support multibyte characters in command names (ARGV array)
depending on locale.

- add setlocale()
- remove printable() function
- add VIS_OCTAL and VIS_SAFE to the flag of strvisx() to di

top(1): support multibyte characters in command names (ARGV array)
depending on locale.

- add setlocale()
- remove printable() function
- add VIS_OCTAL and VIS_SAFE to the flag of strvisx() to display
non-printable characters that do not use C-style backslash sequences
in three digit octal sequence, or remove it

This change allows multibyte characters to be displayed according to
locale. If it is recognized as a non-display character according to the
locale, it is displayed in three digit octal sequence.

Reference:
https://www.mail-archive.com/svn-src-all@freebsd.org/msg165751.html
https://www.mail-archive.com/svn-src-all@freebsd.org/msg165766.html
https://www.mail-archive.com/svn-src-all@freebsd.org/msg165833.html
https://www.mail-archive.com/svn-src-all@freebsd.org/msg165846.html
https://www.mail-archive.com/svn-src-all@freebsd.org/msg165891.html

Submitted by: hrs
Differential Revision: https://reviews.freebsd.org/D16204

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Merge ^/head r343956 through r344177.

Fix multiple warnings in usr.bin/top about discarded qualifiers from
both clang and gcc, by either constifying variables, or when that is not
possible, using __DECONST.

MFC after: 1 week

top(1): include what you use

- Change headers to more closely match what we use
- use more standard functions instead of bzero, bcmp, bcopy
- Add myself to authors.

Tested with: base clang (amd64),

top(1): include what you use

- Change headers to more closely match what we use
- use more standard functions instead of bzero, bcmp, bcopy
- Add myself to authors.

Tested with: base clang (amd64), gcc 9 (amd64), base clang (i386), base
gcc (mips)

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top(1): top warnings and cleanup

- Add const where helpful
- add missing 'static' for file-local functions
- use nitems where possible
- convert manual abort() to assert
- use strndup instead of hom

top(1): top warnings and cleanup

- Add const where helpful
- add missing 'static' for file-local functions
- use nitems where possible
- convert manual abort() to assert
- use strndup instead of homegrown version

Tested with clang, gcc7, and gcc9

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top(1): const poison part 2

Further reduce the number of warnings emitted by gcc.

top(1): further unconditionally assume we're on FreeBSD

top(1): build with WARNS=3

This fixes everything but
-Wincompatible-pointer-types-discards-qualifiers

top(1): clean much of WARNS=3 issues

There is still one glaring issue: new_message is not a protoype, but
can't be trivially converted since it uses K&R style var-args.

top(1): Migrate top to usr.bin

We've been maintaining top(1) for a long time, and the upstream
hasn't existed/been used in similarly as long. Make it clear that we own
top(1)

Tested with 'make univ

top(1): Migrate top to usr.bin

We've been maintaining top(1) for a long time, and the upstream
hasn't existed/been used in similarly as long. Make it clear that we own
top(1)

Tested with 'make universe'. Everything passed except MIPS which failed
for unrelated reasons. Install also tested for amd64.

Reviewed by: sbruno
No objections: imp, mmacy
Differential Revision: https://reviews.freebsd.org/D15387

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