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Date: Mon, 15 Mar 93 10:54:08 JST
From: "Akio    Kido" <kido@vnet.IBM.COM>
To: sc22wg15@dkuug.dk, sc22wg20@dkuug.dk, XoJIG@xopen.co.uk,
        sig-international@osf.org, uojlg-bse@uiap.ui.org,
        efischer@donald.aix.kingston.ibm.com
Subject: MSE 4.1.mm
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.SK
.H 1 Library
.P
Various portions of clause 7 of \*(AC
are adjusted to include the following specifications.
Each subclause to be extended
usually has a correspondingly titled subclause
in this portion of this amendment.
.H 2 "Definitions of terms"
.eX 7.1.1
.P
A
.I "wide character"
is a code value
(a bit pattern)
of an object of type
.Cf wchar_t
that corresponds to a member of the extended character set.\*F
.FS
An equivalent definition can be found in subclause 6.1.3.4 of \*(AC.
.FE
.P
A
.I "null wide character"
is a wide character with value zero.
.P
A
.I "wide string"
is a contiguous sequence of wide characters terminated by
and including the first null wide character.
A ``pointer to'' a wide string
is a pointer to its initial
(lowest addressed)
wide character.
The ``length'' of a wide string
is the number of wide characters
preceding the null wide character
and its ``value''
is the sequence of code values of the contained wide characters,
in order.
.P
A
.I "shift sequence"
is a contiguous sequence of bytes within a multibyte string
that causes a change in shift state.
(See \*(AC subclause 5.2.1.2.)
Shift sequences shall not have corresponding wide characters;
they are instead taken to be an adjunct to an adjacent multibyte character.\*F
.FS
For state-dependent encodings,
the values for
.Cf MB_CUR_MAX
and
.Cf MB_LEN_MAX
must thus be large enough to count all the bytes
in any complete multibyte character
plus at least one adjacent shift sequence of maximum length.
Whether these counts provide for more than one shift sequence
is the implementation's choice.
.FE
.H 2 "Standard headers"
.eX 7.1.2
The list of standard headers is adjusted to include two new standard headers,
.Cf <iso646.h>
and
.Cf <wchar.h> .
.H 2 "Errors \*(Cw<errno.h>\fP"
.eX 7.1.4
The list of macros defined in
.Cf <errno.h>
is adjusted to include a new macro,
.Cf EILSEQ .
.H 2 "Alternative spellings \*(Cw<iso646.h>\fP"
.P
The header
.Cf <iso646.h>
defines the following eleven macros
(on the left)
that expand to the corresponding tokens
(on the right):
.Cb
	and      &&
	and_eq   &=
	bitand   &
	bitor    \*|
	compl    \*~
	ne       !=
	not      !
	or       \*|\*|
	or_eq    \*|=
	xor      ^
	xor_eq   ^=
.Ce