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.TH ISWCNTRL "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

iswcntrl,

iswcntrl_l

\(em test for a control wide-character code

.SH SYNOPSIS

.LP

.nf

#include <wctype.h>

.P

int iswcntrl(wint_t \fIwc\fP);

int iswcntrl_l(wint_t \fIwc\fP, locale_t \fIlocale\fP);

.fi

.SH DESCRIPTION

For

\fIiswcntrl\fR():

The functionality described on this reference page is aligned with the

ISO\ C standard. Any conflict between the requirements described here and the

ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.

.P

The

\fIiswcntrl\fR()

and

\fIiswcntrl_l\fR()

functions shall test whether

.IR wc

is a wide-character code representing a character of class

.BR cntrl

in the current locale,

or in the locale represented by

.IR locale ,

respectively; see the Base Definitions volume of POSIX.1\(hy2008,

.IR "Chapter 7" ", " "Locale".

.P

The

.IR wc

argument is a

.BR wint_t ,

the value of which the application shall ensure is a wide-character

code corresponding to a valid character in the current locale, or equal

to the value of the macro WEOF. If the argument has any other value,

the behavior is undefined.

.P

The behavior is undefined if the

.IR locale

argument to

\fIiswcntrl_l\fR()

is the special locale object LC_GLOBAL_LOCALE or is not a valid locale

object handle.

.SH "RETURN VALUE"

The

\fIiswcntrl\fR()

and

\fIiswcntrl_l\fR()

functions shall return non-zero if

.IR wc

is a control wide-character code; otherwise, they shall return 0.

.SH ERRORS

No errors are defined.

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

To ensure applications portability, especially across natural

languages, only these functions and the functions in the reference pages

listed in the SEE ALSO section should be used for character classification.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fIiswalnum\fR\^(\|)",

.IR "\fIiswalpha\fR\^(\|)",

.IR "\fIiswctype\fR\^(\|)",

.IR "\fIiswdigit\fR\^(\|)",

.IR "\fIiswgraph\fR\^(\|)",

.IR "\fIiswlower\fR\^(\|)",

.IR "\fIiswprint\fR\^(\|)",

.IR "\fIiswpunct\fR\^(\|)",

.IR "\fIiswspace\fR\^(\|)",

.IR "\fIiswupper\fR\^(\|)",

.IR "\fIiswxdigit\fR\^(\|)",

.IR "\fIsetlocale\fR\^(\|)",

.IR "\fIuselocale\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "Chapter 7" ", " "Locale",

.IR "\fB<locale.h>\fP",

.IR "\fB<wctype.h>\fP"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the

event of any discrepancy between this version and the original IEEE and

The Open Group Standard, the original IEEE and The Open Group Standard

is the referee document. The original Standard can be obtained online at

http://www.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .