ISWBLANKSection: Linux Programmer's Manual (3)
Index | Return to Main Contents
NAMEiswblank - test for whitespace wide character
#include <wctype.h> int iswblank(wint_t wc);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTIONThe iswblank() function is the wide-character equivalent of the isblank(3) 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".
RETURN VALUEThe iswblank() function returns nonzero if wc is a wide character belonging to the wide-character class "blank". Otherwise, it returns zero.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|iswblank()||Thread safety||MT-Safe locale|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
NOTESThe behavior of iswblank() depends on the LC_CTYPE category of the current locale.
SEE ALSOisblank(3), iswctype(3)
COLOPHONThis page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
Return to Main Contents