PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values t

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

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Remove duplicate function declaration. From Henning Petersen in PR 45998.

close on exec fixes:
- open + fcntl -> open O_CLOEXEC
- configuration database file descriptors that can stay open are now opened
fopen(db, "re")

- Add strndup and stresep
- Use stresep so in fstab so that we can mount paths with white space in them.

Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

WARNS=4

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

botched strncpy -> strlcpy
from xs@kittenz.org

fstabscan() fixes:
- if _fs_fstab.fs_type is NULL, the line is incorrect, so warn about it
rather than trying to deference a NULL pointer.
fixes [bin/13787] by Dave Burgess.
- clear _fs_fstab bef

fstabscan() fixes:
- if _fs_fstab.fs_type is NULL, the line is incorrect, so warn about it
rather than trying to deference a NULL pointer.
fixes [bin/13787] by Dave Burgess.
- clear _fs_fstab before each use (just to be sure)

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Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attemp

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

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add a new fstab type "dp" for the user-specified dump device.
change swapctl -A to see this and add it via swapctl(2). also
add a new swapctl -D <device> to change the dump device on the
fly.

Fix printf format errors.

- Use strsep() instead of strtok_r()
- Use warn{x,}() instead of home brewed error()
- Simplify some code.

Use strtok_r() instead of strtok(), lest the application be surprised by
strtok()'s internal marker having changed.

Need "namespace.h".

Use warn(3).

const poisoning.

remove obsolete register declarations

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

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Fix RCSID's
Fix bogus NULL casts
GC constant strings.
Fix gcc warnings.

- convert unsafe strcpy(), strcat() and sprintf() to the `n' versions.
- some KNF.

Add explict function return types

oops; since i kept the writev() trick, still need uio.h