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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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ISWBLANK(3) Linux Programmer's Manual ISWBLANK(3)
iswblank - test for whitespace wide character
#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
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'.
The iswblank() function returns nonzero if wc is a wide character
belonging to the wide-character class "blank". Otherwise, it
returns zero.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│iswblank() │ Thread safety │ MT-Safe locale │
└───────────────────────────────┴───────────────┴────────────────┘
POSIX.1-2001, POSIX.1-2008.
The behavior of iswblank() depends on the LC_CTYPE category of
the current locale.
isblank(3), iswctype(3)
This page is part of release 5.13 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
https://www.kernel.org/doc/man-pages/.
GNU 2021-03-22 ISWBLANK(3)
Pages that refer to this page: isalpha(3), iswctype(3)
Copyright and license for this manual page
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