mirror of https://github.com/mkerrisk/man-pages
74 lines
1.9 KiB
Groff
74 lines
1.9 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
|
|
.\"
|
|
.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
|
|
.\" This is free documentation; you can redistribute it and/or
|
|
.\" modify it under the terms of the GNU General Public License as
|
|
.\" published by the Free Software Foundation; either version 2 of
|
|
.\" the License, or (at your option) any later version.
|
|
.\" %%%LICENSE_END
|
|
.\"
|
|
.\" 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 2014-02-10 "GNU" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
iswcntrl \- test for control wide character
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #include <wctype.h>
|
|
.sp
|
|
.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
|
|
.SS Multithreading (see pthreads(7))
|
|
The
|
|
.BR iswcntrl ()
|
|
function is thread-safe with exceptions.
|
|
It can be safely used in multithreaded applications, as long as
|
|
.BR setlocale (3)
|
|
is not called to change the locale during its execution.
|
|
.SH CONFORMING TO
|
|
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)
|