It replaces the existing pwcache.c functions user_from_uid(3) and
group_from_gid(3) with the pax equivalents.  Adapted from NetBSD
(mycroft) changes from our own pax's cache.c.  OK guenther@

with the types.
OK jca@

This version of the function will always open the secure/shadow/master
password files. Soon, the regular variants of these functions will not.
(Intermixing shadow and regular gets a little weird; don't do that.)
Not using struct spwd and getspwnam functions to reduce churn in callers.
Should just be a one line diff in most places.
ok deraadt

ok guenther millert kettenis

the buffer size.  OK deraadt@

in sys/cdefs.h) instead of _FOO_SOURCE.  Also fix several namespace
pollution issues, including the byte order defines.  OK deraadt@

Today it finally dies.  Based on a diff from Gabriel Kihlman.

rescinded 22 July 1999.  Proofed by myself and Theo.

bit flags ORed together.  Currently the only flags defined are
_PASSWORD_SECUREONLY and _PASSWORD_OMITV7 but this is enough to
cause pw_mkdb() to run pwd_mkdb with the options we want.
With this change we no longer generate the old V7 passwd file when
only the extra fields in master.passwd (or the encrypted password)
have changed.  There are other programs that could probably use
the _PASSWORD_OMITV7 flag; they will be converted at a future date.

a single chunk with the strings pointing elsewhere in the buffer so
a simple free() of the struct passwd * is all that is needed to decallocate.