src/lib/libc/stdio/refill.c, branch stable/8

Next stage of stdio cleanup: Retire __sFILEX and merge the fields back into

2008-04-17T22:17:54+00:00

__sFILE.  This was supposed to be done in 6.0.  Some notes:
- Where possible I restored the various lines to their pre-__sFILEX state.
- Retire INITEXTRA() and just initialize the wchar bits (orientation and
  mbstate) explicitly instead.  The various places that used INITEXTRA
  didn't need the locking fields or _up initialized.  (Some places needed
  _up to exist and not be off the end of a NULL or garbage pointer, but
  they didn't require it to be initialized to a specific value.)
- For now, stdio.h "knows" that pthread_t is a 'struct pthread *' to
  avoid namespace pollution of including all the pthread types in stdio.h.
  Once we remove all the inlines and make __sFILE private it can go back
  to using pthread_t, etc.
- This does not remove any of the inlines currently and does not change
  any of the public ABI of 'FILE'.

MFC after:	1 month
Reviewed by:	peter

Per Regents of the University of Calfornia letter, remove advertising

2007-01-09T00:28:16+00:00

clause.

# If I've done so improperly on a file, please let me know.

Basic support for wide character I/O: getwc(), fgetwc(), getwchar(),

2002-08-13T09:30:41+00:00

putwc(), fputwc(), putwchar(), ungetwc(), fwide().

Fix the style of the SCM ID's.

2002-03-22T21:53:29+00:00

I believe have made all of libc .c's as consistent as possible.

Remove __P() usage.

2002-03-21T22:49:10+00:00

Re-arrange my funopen(3) fix to minimize differences with original stdio code,

2001-09-03T02:24:37+00:00

no functional changes.

Add fp->_offset optimization in _SAPP+_SOPT case

Fix bug in off_t overflow checking: if fp->_offset overflows, just remove

2001-09-02T19:52:09+00:00

__SOFF flag (i.e. we don't have offset) instead of returning EOVERFLOW.
It allows again continious reading from non-stop stream.

Move all stdio internal flags processing and setting out of __sread(),

2001-09-02T19:10:10+00:00

__swrite() and __sseek() to higher level. According to funopen(3) they all
are just wrappers to something like standard read(2), write(2) and
lseek(2), i.e. must not touch stdio internals because they are replaceable
with any other functions knows nothing about stdio internals. See example
of funopen(3) usage in sendmail sources f.e.

NOTE: this is original stdio bug, not result of my range checkin added.

Fix style breakage.

2001-03-05T11:06:18+00:00

Fix the current libc breakage in current:

2001-02-16T06:11:22+00:00

o Back out the __std* stuff.  Can't figure out how to do this right now,
  so we'll save it for late.
o use _up as a pointer for extra fields that we need to access.
o back out the libc major version bump.

Submitted by: green
reviewed by: peter, imp, green, obrien (to varying degrees).

We'll fix the "how do we stop encoding sizeof(FILE) in binaries" part
later.