remove unneeded includes

from Michal Mazurek, ok tb@

remove needless headers

ok tb@, from Michal Mazurek

Use strlcpy to copy strings in struct mount, not memmove. Avoids
reading past the end of a buffer. Problem found and OK jsg@

Avoid SIGFPE when parsing an invalid ext2fs through a raw device operation.

ok millert

Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible. Annotate <sys/param.h> lines with their current reasons. Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc. Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution. These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

do not alias unions between files (lint hates it)

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

ansi

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

use strlcpy instead of strncpy+a[len-1]='\0'

$OpenBSD$

Support for ext2fs rev. 1

New struct statfs with mount options. NOTE: this replaces statfs(2),
fstatfs(2), and getfsstat(2) so you will need to build a new kernel
before doing a "make build" or you will get "unimplemented syscall" errors.

The new struct statfs has the following featuires:
o Has a u_int32_t flags field--now softdep can have a real flag.

o Uses u_int32_t instead of longs (nicer on the alpha). Note: the man
page used to lie about setting invalid/unused fields to -1. SunOS does
that but our code never has.

o Gets rid of f_type completely. It hasn't been used since NetBSD 0.9
and having it there but always 0 is confusing. It is conceivable
that this may cause some old code to not compile but that is better
than silently breaking.

o Adds a mount_info union that contains the FSTYPE_args struct. This
means that "mount" can now tell you all the options a filesystem was
mounted with. This is especially nice for NFS.

Other changes:
o The linux statfs emulation didn't convert between BSD fs names
and linux f_type numbers. Now it does, since the BSD f_type
number is useless to linux apps (and has been removed anyway)

o FreeBSD's struct statfs is different from our (both old and new)
and thus needs conversion. Previously, the OpenBSD syscalls
were used without any real translation.

o mount(8) will now show extra info when invoked with no arguments.
However, to see *everything* you need to use the -v (verbose) flag.

tabify

Wall

Better support for unmounted filesystems (i.e. df /dev/rsd0a):
- interpret the superblock of lfs, ext2fs, and ffs filesystems.
- never mount() an offline filesystem, always read its superblock.
- use the same algorithm as statfs() for ffs, get the same answers.

Even so, now I'm really unsure this code should remain in df.
Similar functionality should be added to dumpfs or fsck instead.