iswcntrl

int iswcntrl( wint_t ch );

Checks if the given wide character is a control character, i.e. codes 0x00-0x1F and 0x7F and any control characters specific to the current locale.

Parameters

Return value

Non-zero value if the wide character is a control character, zero otherwise.

Notes

ISO 30112 defines POSIX control characters as Unicode characters U+0000..U+001F, U+007F..U+009F, U+2028, and U+2029 (Unicode classes Cc, Zl, and Zp).

Example

#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.h>
 
int main(void)
{
    wchar_t c = L'\u2028'; // the Unicode character "line separator"
    printf("in the default locale, iswcntrl(%#x) = %d\n", c, !!iswcntrl(c));
    setlocale(LC_ALL, "en_US.utf8");
    printf("in Unicode locale, iswcntrl(%#x) = %d\n", c, !!iswcntrl(c));
}

in the default locale, iswcntrl(0x2028) = 0
in Unicode locale, iswcntrl(0x2028) = 1

References

• C11 standard (ISO/IEC 9899:2011):
• 7.30.2.1.4 The iswcntrl function (p: 449)
• C99 standard (ISO/IEC 9899:1999):
• 7.25.2.1.4 The iswcntrl function (p: 395)

See also