| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
Language Environment |
both |
#include <wctype.h>
int iswblank(wint_t wc);#define _ISOC99_SOURCE
#include <wctype.h>
int iswblank(wint_t wc);Tests for a wide blank character.
The space, uppercase, and lowercase characters can be redefined by their respective classes of the LC_CTYPE in the current locale.
For use as a C library function: To avoid infringing on the user's name space, this nonstandard function has two names. One name, __iswblk(), and the other as shown above. The name shown above is exposed only when you use the compiler option LANGLVL(EXTENDED) or define the _EXT feature test macro.
For use as a z/OS UNIX function: Define the _OPEN_SYS feature test macro.
If the wide integer satisfies the test value, iswblank() returns nonzero.
If the wide integer does not satisfy the test value, iswblank() returns 0.
The value for wc must be representable as a wide unsigned char. WEOF is a valid input value.
The behavior of iswblank() is affected by the LC_CTYPE category of the current locale. If you change the category, undefined results can occur.