#include <wchar.h>
#include <wctype.h>

/* Our definition of whitespace is the Unicode White_Space property,
 * minus non-breaking spaces (U+00A0, U+2007, and U+202F) and script-
 * specific characters with non-blank glyphs (U+1680 and U+180E). */

int iswspace(wint_t wc) {
  static const wchar_t spaces[] = {' ',    '\t',   '\n',   '\r',   11,     12,     0x0085, 0x2000,
                                   0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2008, 0x2009,
                                   0x200a, 0x2028, 0x2029, 0x205f, 0x3000, 0};
  return wc && wcschr(spaces, wc);
}