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isspace, iswspace, _isspace_l, _iswspace_l

Determines whether an integer represents a space character.

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
);

c

Integer to test.

locale

Locale to use.

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; see setlocale, _wsetlocale for more information. The versions of these functions that do not 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 is not EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c is not one of these values, the functions raise an assertion.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_ istspace

isspace

_ismbcspace

iswspace

Routine

Required header

isspace

<ctype.h>

iswspace

<ctype.h> or <wchar.h>

_isspace_l

<ctype.h>

_iswspace_l

<ctype.h> or <wchar.h>

For additional compatibility information, see Compatibility.

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