isspace-iswspace-isspace-l-iswspace-l.md

description	title	ms.date	api_name	api_location	api_type	topic_type	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: isspace, iswspace, _isspace_l, _iswspace_l	isspace, iswspace, _isspace_l, _iswspace_l	4/2/2020	iswspace _isspace_l _iswspace_l isspace _o_isspace _o_iswspace	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-string-l1-1-0.dll ntoskrnl.exe	DLLExport	apiref	iswspace _istspace isspace	iswspace function isspace function _iswspace_l function _isspace_l function iswspace_l function isspace_l function _istspace function istspace function	b851e0c0-36bb-4dac-a1a3-533540939035

isspace, iswspace, _isspace_l, _iswspace_l

Determines whether an integer represents a space character.

Syntax

int isspace(
   int c
);
int iswspace(
   wint_t c
);
int _isspace_l(
   int c,
   _locale_t locale
);
int _iswspace_l(
   wint_t c,
   _locale_t locale
);

Parameters

c
Integer to test.

locale
Locale to use.

Return value

Each of these routines returns nonzero if c is a particular representation of a space character. isspace returns a nonzero value if c is a white-space character (0x09 - 0x0D or 0x20). The result of the test condition for the isspace function depends on the LC_CTYPE category setting of the locale. For more information, see setlocale, _wsetlocale. The versions of these functions that don't have the _l suffix use the current locale for any locale-dependent behavior; the versions that do have the _l suffix are identical except that they use the locale that's passed in instead. For more information, see Locale.

iswspace returns a nonzero value if c is a wide character that corresponds to a standard white-space character.

The behavior of isspace and _isspace_l is undefined if c isn't EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c isn't one of these values, the functions raise an assertion.

Generic-text routine mappings

TCHAR.H routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_istspace	isspace	_ismbcspace	iswspace

Remarks

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine	Required header
isspace	<ctype.h>
iswspace	<ctype.h> or <wchar.h>
_isspace_l	<ctype.h>
_iswspace_l	<ctype.h> or <wchar.h>

For more compatibility information, see Compatibility.

See also

Character classification
Locale
is, isw routines