Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

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

ANSIify function definitions.
Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by: md5

Minor cleanup: ANSI C function declarations, use argc after getopt(3) to check
for remaining arguments, rather than checking for *argv being a boolean truth.
Instead of using an empty case to check for -f- to mean "read stdin", and have
stdin reopned otherwise, use a FILE* for the mbox, and assign it to stdin when
we mean to use stdin, otherwise fopen(3). Kill `register' qualifier.

Consistently use FBSDID

remove __P

Replaced unsafe use of sprintf() with snprintf().

optarg and optind are declared in unistd.h.
h_error is declared in netdb.h

$Id$ -> $FreeBSD$

This covers the previous version, since a null commit message was accidentally
used:

Add a -c flag to print a count of messages and exit.

PR: 10921
Submitted by: James Howard <howardjp@byzantine.student.umd.edu>
Requested by: DES

*** empty log message ***

Add usage(), use err(3).

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

Honor the MAIL environment variable, if set.
Submitted-by: Dan Cross <cross@math.psu.edu>

Read from standard input if file name "-" is given.

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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