iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l

Determine if an integer represents a control character.

int iscntrl( 
   int c 
);
int iswcntrl( 
   wint_t c 
);
int _iscntrl_l( 
   int c,
   _locale_t locale
);
int _iswcntrl_l( 
   wint_t c,
   _locale_t locale
);

Parameters

• c
  Integer to test

• locale
  The locale to use.

Return Value

Each of these routines returns nonzero if c is a particular representation of a control character. iscntrl returns a nonzero value if c is a control character (0x00 – 0x1F or 0x7F). iswcntrl returns a nonzero value if c is a control wide character. Each of these routines returns 0 if c does not satisfy the test condition.

When used with a debug CRT library, iscntrl will display a CRT assert if passed a parameter that is not EOF or in the range of 0 through 0xFF. When used with a debug CRT library, iscntrl will use the parameter as an index into an array, with undefined results if the parameter is not EOF or in the range of 0 through 0xFF.

The versions of these functions with the _l suffix are identical except that they use the locale parameter passed in instead of the current locale. For more information, see Locale.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
_istcntrl	iscntrl	iscntrl	iswcntrl
_istcntrl_l	_iscntrl_l	_iscntrl_l	_iswcntrl_l

Requirements

Routine	Required header
iscntrl	<ctype.h>
iswcntrl	<ctype.h> or <wchar.h>
_iscntrl_l	<ctype.h>
_iswcntrl_l	<ctype.h> or <wchar.h>

For additional compatibility information, see Compatibility in the Introduction.

.NET Framework Equivalent

System::Char::IsControl

See Also

Concepts

Character Classification

Locale

is, isw Routines