add linted comment

branches: 1.13.2;
Add negative offset checks to fseeko

These were not strictly needed before, as lseek would error on negative
arguments, but having added open_memstream we have a virtual file pointer
that assumes that it gets sane values, so we get an assertion triggered
on a negative value. Best to check in one place rather than at all the
relevant points.

- widen the internal read and write calls to match the syscalls
- add funopen2() which provides access to flush() and the wider calls.
- make use of the new flush call in fmemopen()

- 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 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@

From tnozaki@: make fpos_t a complex object that keeps track of the parse
state of the stream. Change argument of the seek function to funopen() from
fpos_t to off_t. Make f{g,s}etpos() use the new fpos_t struct, while providing
backwards compatible entry points. Approved by releng@

branches: 1.8.8;
sign-compare fix

Since _file is a short, check that the fd fits in it, otherwise bail with
EMFILE. We treat _file as an unsigned short to double our range, with a
special case for -1 (closed). Make a note of what we should do about stdio
if we ever bump libc. We could change _file in the future compatibly to an
int by putting it in the extension space but for now we don't bother.

branches: 1.6.4; 1.6.8;
remove bogus (void)&var; From Anon Ymous

de __P

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

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

Merge the nathanw_sa branch.

branches: 1.2.2;
Oops, forgot to define weak aliases for public names.
Fixes PR {pkg,lib}/10655.

XCU5: Add fseeko() and ftello() functions which provide the functionality of
fseek() and ftell(), respectively, but operate on file offsets of type off_t.