iswblank (3) Linux Manual Page
iswblank – test for whitespace wide character
Synopsis
#include <wctype.h>Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
int iswblank(wint_t wc);
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 |