iswcntrl - test for control wide character
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
iswcntrl(btowc(c)), but not vice versa.
The iswcntrl() function returns nonzero if
wc is a wide character belonging to the wide-character class
"cntrl". Otherwise, it returns zero.
POSIX.1-2001, POSIX.1-2008, C99.
This page is part of release 5.10 of the Linux
project. A description of the project, information about reporting bugs,
and the latest version of this page, can be found at