Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Unbreak group operations by reverting previous delta which removed the
assignment of `l' in `gr_update' to the return value of snprintf. It
claimed to have fixed the case where snprintf returned -1--in fact, it
broke the entire routine. Not setting `l' here causes fileupdate() to
invariably fail with EINVAL because it does its own check to assert
that the parameter isn't -1.

Handle snprintf() returning -1.

MFC after: 2 weeks

Clean up error handling in fileupdate(), which now returns 0 on success
instead of a boolean. This replicated through he front-end sub-functions
relating to add, delete, modify entries in passwd & group files
Errno is now preserved so output of errc()/warnc() will be less obfuscated
by subsequent errors when reporting the problem.

Add more intelligent error handling when attempting to modify/delete NIS
entries with no corresponding local database entry.

[MFC to stable in a couple of weeks to keep both in sync]

$Id$ -> $FreeBSD$

1) Do not blindly ignore file update errors which may occur due to concurrent
updating
2) Add -V <etcdir>, which allows maintaining user/group database in alternate
locations other than /etc.

Use err(3) instead of local redefinition. Add rcsid string.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

1) 200 users per group limitation removed and pw
will handle lines of any length in /etc/group.
2) Fixed bug with usermod -d not updating user's home
directory.
3) Minor formatting display changes/fixes with *show -P.

This commit was generated by cvs2svn to compensate for changes in r20302,
which included commits to RCS files with non-trunk default branches.

Copyright update by the author, to be more in line with our sample
copyright.

Submitted by: David Nugent

pw(8) -- a backend utility to manage the user and group databases.

sysinstall's new User&group menu will use it, hence it's a 2.2
candidate despite of providing new functionality.

Submitted by: David L. Nugent, <davidn@blaze.net.au>