CTYPE_MASK_space
/* 09 \t */ CTYPE_MASK_blank | CTYPE_MASK_cntrl | CTYPE_MASK_space,
/* 0A \n */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
/* 0B \v */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
/* 0C \f */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
/* 0D \r */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
/* 20 */ CTYPE_MASK_blank | CTYPE_MASK_print | CTYPE_MASK_space
#define ossl_isspace(c) (ossl_ctype_check((c), CTYPE_MASK_space))