1ISWBLANK(3)                Linux Programmer's Manual               ISWBLANK(3)
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NAME

6       iswblank - test for whitespace wide character
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SYNOPSIS

9       #include <wctype.h>
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11       int iswblank(wint_t wc);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       iswblank():
16              _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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DESCRIPTION

19       The  iswblank()  function  is  the wide-character equivalent of the is‐
20       blank(3) function.  It tests whether wc is a wide  character  belonging
21       to the wide-character class "blank".
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23       The  wide-character  class  "blank" is a subclass of the wide-character
24       class "space".
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26       Being a subclass of the wide-character class "space", the  wide-charac‐
27       ter class "blank" is disjoint from the wide-character class "graph" and
28       therefore also disjoint from its subclasses "alnum", "alpha",  "upper",
29       "lower", "digit", "xdigit", "punct".
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31       The  wide-character  class  "blank"  always contains at least the space
32       character and the control character '\t'.
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RETURN VALUE

35       The iswblank() function returns nonzero if wc is a wide  character  be‐
36       longing  to  the  wide-character  class "blank".  Otherwise, it returns
37       zero.
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ATTRIBUTES

40       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
41       tributes(7).
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43       ┌───────────┬───────────────┬────────────────┐
44       │Interface  │ Attribute     │ Value          │
45       ├───────────┼───────────────┼────────────────┤
46       │iswblank() │ Thread safety │ MT-Safe locale │
47       └───────────┴───────────────┴────────────────┘

CONFORMING TO

49       POSIX.1-2001, POSIX.1-2008.
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NOTES

52       The behavior of iswblank() depends on the LC_CTYPE category of the cur‐
53       rent locale.
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SEE ALSO

56       isblank(3), iswctype(3)
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COLOPHON

59       This page is part of release 5.10 of the Linux  man-pages  project.   A
60       description  of  the project, information about reporting bugs, and the
61       latest    version    of    this    page,    can     be     found     at
62       https://www.kernel.org/doc/man-pages/.
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66GNU                               2019-03-06                       ISWBLANK(3)
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