iswblank(3) - Linux manual page (original) (raw)

iswblank(3) Library Functions Manual iswblank(3)

NAME top

   iswblank - test for whitespace wide character

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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 top

   The **iswblank**() function is the wide-character equivalent of the
   [isblank(3)](../man3/isblank.3.html) 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 top

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

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌───────────────────────────────┬───────────────┬────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├───────────────────────────────┼───────────────┼────────────────┤
   │ **iswblank**()                    │ Thread safety │ MT-Safe locale │
   └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   POSIX.1-2001.

NOTES top

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

SEE ALSO top

   [isblank(3)](../man3/isblank.3.html), [iswctype(3)](../man3/iswctype.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 iswblank(3)

Pages that refer to this page:isalpha(3), iswctype(3)