iswcntrl(3) Library Functions Manual iswcntrl(3)
NAME
iswcntrl - test for control wide character
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <wctype.h>
int iswcntrl(wint_t wc);
DESCRIPTION
The iswcntrl() function is the wide-character equivalent of the iscn-
trl(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
The iswcntrl() function returns nonzero if wc is a wide character be-
longing to the wide-character class "cntrl". Otherwise, it returns
zero.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌─────────────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼────────────────┤
│ iswcntrl() │ Thread safety │ MT-Safe locale │
└─────────────────────────────────────┴───────────────┴────────────────┘
STANDARDS
C11, POSIX.1-2008.
HISTORY
POSIX.1-2001, C99.
NOTES
The behavior of iswcntrl() depends on the LC_CTYPE category of the cur-
rent locale.
SEE ALSO
iscntrl(3), iswctype(3)
Linux man-pages 6.9.1 2024-05-02 iswcntrl(3)
Generated by dwww version 1.16 on Tue Dec 16 04:35:16 CET 2025.