The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> iswcntrl - test for a control wide-character code

#### SYNOPSIS

> ``#include <wctype.h>
> int iswcntrl(wint_t` wc`);
> ``

#### DESCRIPTION

> [CX] 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 IEEE Std 1003.1-2001 defers to the ISO C standard.

> The iswcntrl() function shall test whether wc is a wide-character code representing a character of class cntrl in the program's current locale; see the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale.

> The wc argument is a 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.

#### RETURN VALUE

> The iswcntrl() function shall return non-zero if wc is a control wide-character code; otherwise, it shall return 0.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> To ensure applications portability, especially across natural languages, only this function and those listed in the SEE ALSO section should be used for classification of wide-character codes.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> iswalnum(), iswalpha(), iswctype(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <wchar.h>, <wctype.h>

#### CHANGE HISTORY

> First released in Issue 4.

#### Issue 5

> The following change has been made in this issue for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):

> - The SYNOPSIS has been changed to indicate that this function and associated data types are now made visible by inclusion of the <wctype.h> header rather than <wchar.h>.

#### Issue 6

> The DESCRIPTION is updated to avoid use of the term "must" for application requirements.

End of informative text.

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