| ISWBLANK(3) | Linux Programmer's Manual | ISWBLANK(3) |
iswblank - test for whitespace wide character
#include <wctype.h> int iswblank (wint_t wc);
The iswblank function is the wide-character equivalent of the isblank function. It tests whether wc is a wide character belonging to the wide character class "blank".
The wide character class "blank" is a subclass of the wide character class "space".
Being a subclass of the wide character class "space", the wide character class "blank" is disjoint from the wide character class "graph" and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct".
The wide character class "blank" always contains at least the space character and the control character '\t'.
The iswblank function returns non-zero if wc is a wide character belonging to the wide character class "blank". Otherwise it returns zero.
This function is a GNU extension.
The behaviour of iswblank depends on the LC_CTYPE category of the current locale.
| July 25, 1999 | GNU |