iswcntrl(3) — Linux manual page

iswcntrl(3)              Library Functions Manual             iswcntrl(3)

NAME         top

       iswcntrl - test for control wide character

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <wctype.h>

       int iswcntrl(wint_t wc);

DESCRIPTION         top

       The iswcntrl() function is the wide-character equivalent of the
       iscntrl(3) function.  It tests whether wc is a wide character
       belonging to the wide-character class "cntrl".

       The wide-character class "cntrl" is disjoint from the wide-
       character class "print" and therefore also disjoint from its
       subclasses "graph", "alpha", "upper", "lower", "digit", "xdigit",
       "punct".

       For an unsigned char c, iscntrl(c) implies iswcntrl(btowc(c)), but
       not vice versa.

RETURN VALUE         top

       The iswcntrl() function returns nonzero if wc is a wide character
       belonging to the wide-character class "cntrl".  Otherwise, it
       returns zero.

ATTRIBUTES         top

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

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001, C99.

NOTES         top

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

SEE ALSO         top

       iscntrl(3), iswctype(3)

COLOPHON         top

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Linux man-pages 6.15            2025-05-17                    iswcntrl(3)

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

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