zircon/third_party/ulib/musl/src/ctype/iswcntrl.c

#include <wctype.h>

int iswcntrl(wint_t wc) {
  return (unsigned)wc < 32 || (unsigned)(wc - 0x7f) < 33 || (unsigned)(wc - 0x2028) < 2 ||
         (unsigned)(wc - 0xfff9) < 3;
}