- ansify, knf.
- no functional changes

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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revert some of dsl's changes to make things build on i386; he can undo what
he wants when he comes back.

Lint is differentially far too picky...
Remove some warnings that only appear on i386 (not on amd64) and that
for some reason best known to others are deemed fatal for i386.
Making this code 'pass li

Lint is differentially far too picky...
Remove some warnings that only appear on i386 (not on amd64) and that
for some reason best known to others are deemed fatal for i386.
Making this code 'pass lint' does absolutely nothing for its readability (etc).

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Remove a load of pointless casts - one that even lint doesn't bleat about.

oops, fix miss-increment fp->_p.

mbrtowc(3) never return correct multibyte length of L'\0'.

don't use __sgetc() to avoid overwriting fwide(3) orientation
(__srget() call by __sgetc() uses _SET_ORIENTATION macro).

SUSv3 said, if an encoding error occurs, the error indicator
for the stream shall be set.

Add missing __RCSID()

add fgetws() and fputws() (lib/20576).

Note: fgetws.c, fgetws.3, fputws.c and fputws.3 are obtained from FreeBSD,
and fitted by sigsegv@infoseek.jp and me.

Merge the nathanw_sa branch.

- make FILE structure extensible without breaking binary-compatibility.
- add fputwc, fgetwc, fwide and related functions.
- add hooks needed to maintain the orientation of file stream.