iswblank(3)

1iswblank(3)                Library Functions Manual                iswblank(3)
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NAME

6       iswblank - test for whitespace wide character
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

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

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

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

43       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
44       tributes(7).
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46       ┌─────────────────────────────────────┬───────────────┬────────────────┐
47       │Interface                            │ Attribute     │ Value          │
48       ├─────────────────────────────────────┼───────────────┼────────────────┤
49       │iswblank()                           │ Thread safety │ MT-Safe locale │
50       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

53       POSIX.1-2008.
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HISTORY

56       POSIX.1-2001.
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NOTES

59       The behavior of iswblank() depends on the LC_CTYPE category of the cur‐
60       rent locale.
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