_bcs_isdigit
#define isdigit(c) _bcs_isdigit(c)
#define isdigit(c) _bcs_isdigit(c)
} else if (_bcs_isdigit(ch) == 0) \
if (!_bcs_isdigit(*p)) {
} else if (!_bcs_isdigit(c))
if (_bcs_isdigit((int)(unsigned char)buf[0])) {
if (_region_size(r) == 0 || !_bcs_isdigit(_region_peek8(r, 0)))