grdc.6: Improve grammar a little bit.

grdc.6: Fix .Dd typo.

grdc(6): Add '-t' option to show time in 12-hour format

Partially based on FreeBSD's implementation (revision 112749). But I
moved the AM/PM mark to the upper-left corner instead of the
bottom-righ

grdc(6): Add '-t' option to show time in 12-hour format

Partially based on FreeBSD's implementation (revision 112749). But I
moved the AM/PM mark to the upper-left corner instead of the
bottom-right corner as in FreeBSD, because the mark in the bottom-right
corner would be flushed by scrolling.

In addition, improve the determination of AM/PM mark, including:
00:mm -> 12:mm AM
12:mm -> 12:mm PM

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grdc(6): Improve scrolling timestamp precisions

Use clock_gettime() to obtain the current time with higher precision,
which is used to improve the scrolling timestamp, trying to make the
scrolling e

grdc(6): Improve scrolling timestamp precisions

Use clock_gettime() to obtain the current time with higher precision,
which is used to improve the scrolling timestamp, trying to make the
scrolling end on the integral seconds.

Inspired by OpenBSD's implementation.

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grdc(6): Allow 'q' to quit immediately

Add support to allow pressing 'q' to quit immediately.

Partially based on OpenBSD's implementation:
https://github.com/openbsd/src/commit/8ca82b000914eb1e6f45

grdc(6): Allow 'q' to quit immediately

Add support to allow pressing 'q' to quit immediately.

Partially based on OpenBSD's implementation:
https://github.com/openbsd/src/commit/8ca82b000914eb1e6f45d22092c9358df4233247

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grdc(6): Improve handling of long scroll delays

Add the scroll delay to the current time, so that the finally showed
time matches the real current time.

In addition, skip nanosleep() if the sleep i

grdc(6): Improve handling of long scroll delays

Add the scroll delay to the current time, so that the finally showed
time matches the real current time.

In addition, skip nanosleep() if the sleep interval is negative.

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grdc(6): Various code cleanups

* Staticize various variables and functions.
* Reduce file-global variables.
* Minor style updates.
* Add a copyright header (as did by OpenBSD).

grdc(6): Fix 100% CPU usage and make timeout work again

grdc(6) was passing a timespec with tv_nsec = 1000000*1000, which is
invalid. So every nanosleep() call just returns with EINVAL error.
This

grdc(6): Fix 100% CPU usage and make timeout work again

grdc(6) was passing a timespec with tv_nsec = 1000000*1000, which is
invalid. So every nanosleep() call just returns with EINVAL error.
This causes grdc(6) to loop hard and uses 100% CPU. It also brreaks
the optional timeout argument; grdc(6) just exits immediately.

Fix the above issue by correctly setting the timespec argument.

This fix also makes the optional timeout argument work again.

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