isblank, iswblank, _isblank_l, _iswblank_l

Determines whether an integer represents a blank character.

int isblank(
   int c 
);
int iswblank(
   wint_t c 
);
int _isblank_l(
   int c,
   _locale_t locale
);
int _iswblank_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 or horizontal tab character, or is one of a locale-specific set of characters that are used to separate words within a line of text. isblank returns a nonzero value if c is a space character (0x20) or horizontal tab character (0x09). The result of the test condition for the isblank functions depends on the LC_CTYPE category setting of the locale; for more information, see setlocale, _wsetlocale. 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.

iswblank returns a nonzero value if c is a wide character that corresponds to a standard space or horizontal tab character.

The behavior of isblank and _isblank_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

Requirements

For additional compatibility information, see Compatibility.

.NET Framework Equivalent

System::Char::IsWhiteSpace

See Also

Reference

Character Classification

Locale

is, isw Routines