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

Fix build on architectures where off_t is signed by casting to uintmax_t
before comparing with a size_t.

Fix head -c ### where ### is greater than 2^31. Unlike the submitted
patch this uses off_t.

WARNSify and add $FreeBSD$ to Makefile.

PR: bin/107824
Submitted by: Brian Cornell <briancornell at earthlink dot net>
MFC after: 3 days

Remove duplicate __FBSDID() - spotted by trying to build with a non-GNU
compiler.

Consistently use FBSDID

Fix VCS tags; ANSIfy functions

1) Staticise.
2) Remove registers.
3) Change some ints to size_t which are used with fread/fwrite.

remove __P

Make usage message and man page synopsis reflect the fact that -n
and -c are mutually exclusive.

PR: 34233
Submitted by: Gary W. Swearingen <swear@blarg.net>
MFC after: 3 days

In order to perform faster when doing "head -n", use a pair of
fgetln/fwrite instead of getc/putchar, this seems about five times
faster.

change a global into a local, misc style fixes

$Id$ -> $FreeBSD$

fread() returns 0 on eof or error, not EOF. This fixes the following
bug:

"head -c <n>" never exit and loops forever (until it is killed),
if the input stream has fewer bytes than specified (n).

PR: bin/8225
Submitted-by: FUJIMOTO Kensaku <fujimoto@oscar.elec.waseda.ac.jp>

Setting eval to 1 after calling warn was the original behaviour.

Use err(3) instead of local redefinition.

Support for -c, byte count.

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

Merge from Lite2

first check the count and then get
the next line of characters and not cause it to first get
the characters even if the count (cnt) has become 0.

Submitted by: R Bezuidenhout <rbezuide@mikom.csir.co.za>

head(1) ignored EOFs (in certain cases).

Closes PR # bin/678: head(1) ignore EOF

Submitted by: wosch@cs.tu-berlin.de (Wolfram Schneider)

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

BSD 4.4 Lite Usr.bin Sources