iswblank (3)

NAME

iswblank - test for whitespace wide character

SYNOPSIS

#include <wctype.h>
int iswblank(wint_t wc);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
iswblank():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

The 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".
The wide-character class "blank" always contains at least the space character and the control character '\t'.

RETURN VALUE

The iswblank() function returns nonzero if wc is a wide character belonging to the wide-character class "blank". Otherwise, it returns zero.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
iswblank () Thread safety MT-Safe locale

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.

NOTES

The behavior of iswblank() depends on the LC_CTYPE category of the current locale.

SEE ALSO

isblank(3), iswctype(3)

Information

Source
Linux kernel
OS/version
GNU
Source updated
March 15, 2016
Page created
February 9, 2018
Page generated
December 2, 2018