NAME

       iswblank - test for whitespace wide character

LIBRARY

       Standard C library (libc, -lc)

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 │
       └──────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

NOTES

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

SEE ALSO

       isblank(3), iswctype(3)

Linux man-pages 6.9.1                              2024-06-15                                        iswblank(3)