iswcntrl(3)

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

6       iswcntrl - test for control 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 iswcntrl(wint_t wc);
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DESCRIPTION

17       The  iswcntrl()  function is the wide-character equivalent of the iscn‐
18       trl(3) function.  It tests whether wc is a wide character belonging  to
19       the wide-character class "cntrl".
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21       The  wide-character  class  "cntrl" is disjoint from the wide-character
22       class "print" and therefore also disjoint from its subclasses  "graph",
23       "alpha", "upper", "lower", "digit", "xdigit", "punct".
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25       For  an unsigned char c, iscntrl(c) implies iswcntrl(btowc(c)), but not
26       vice versa.
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RETURN VALUE

29       The iswcntrl() function returns nonzero if wc is a wide  character  be‐
30       longing  to  the  wide-character  class "cntrl".  Otherwise, it returns
31       zero.
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ATTRIBUTES

34       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
35       tributes(7).
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37       ┌─────────────────────────────────────┬───────────────┬────────────────┐
38       │Interface                            │ Attribute     │ Value          │
39       ├─────────────────────────────────────┼───────────────┼────────────────┤
40       │iswcntrl()                           │ Thread safety │ MT-Safe locale │
41       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

44       C11, POSIX.1-2008.
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HISTORY

47       POSIX.1-2001, C99.
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NOTES

50       The behavior of iswcntrl() depends on the LC_CTYPE category of the cur‐
51       rent locale.
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