iswblank

Header: <wctype.h>

Checks if the given wide character is classified as blank character (that is, a whitespace character used to separate words in a sentence) by the current C locale. In the default C locale, only space (0x20) and horizontal tab (0x09) are blank characters.

# Declarations

int iswblank( wint_t ch );

(since C99)

# Parameters

# Return value

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

# Notes

ISO 30112 defines POSIX blank characters as Unicode characters U+0009, U+0020, U+1680, U+180E, U+2000..U+2006, U+2008, U+200A, U+205F, and U+3000.

# Example

#include <locale.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
 
int main(void)
{
    wchar_t c = L'\u3000'; // Ideographic space ('　')
    printf("In the default locale, iswblank(%#x) = %d\n", c, !!iswblank(c));
    setlocale(LC_ALL, "en_US.utf8");
    printf("In Unicode locale, iswblank(%#x) = %d\n", c, !!iswblank(c));
}

# See also