user_namespaces.7: Minor rewordings of recently added text

[thirdparty/man-pages.git] / man3 / iswcntrl.3

.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
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.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH ISWCNTRL 3  2015-08-08 "GNU" "Linux Programmer's Manual"
.SH NAME
iswcntrl \- test for control wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.PP
.BI "int iswcntrl(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR iswcntrl ()
function is the wide-character equivalent of the
.BR iscntrl (3)
function.
It tests whether
.I wc
is a wide character
belonging to the wide-character class "cntrl".
.PP
The wide-character class "cntrl" is disjoint from the wide-character class
"print" and therefore also disjoint from its subclasses "graph", "alpha",
"upper", "lower", "digit", "xdigit", "punct".
.PP
For an unsigned char
.IR c ,
.I iscntrl(c)
implies
.IR iswcntrl(btowc(c)) ,
but not vice versa.
.SH RETURN VALUE
The
.BR iswcntrl ()
function returns nonzero if
.I wc
is a
wide character belonging to the wide-character class "cntrl".
Otherwise, it returns zero.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR iswcntrl ()
T}	Thread safety	MT-Safe locale
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
.SH NOTES
The behavior of
.BR iswcntrl ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR iscntrl (3),
.BR iswctype (3)