isspace, iswspace, _isspace_l, _iswspace_l
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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; 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 |
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 additional compatibility information, see Compatibility.