FLD_D
while ((*(pos+1) != '\0') && !((FLD_D | REC_D_F) & l_d_mask[*++pos]));\
d_mask['\t'] = d_mask[' '] = BLANK | FLD_D;
d_mask[' '] &= ~FLD_D;
d_mask['\t'] &= ~FLD_D;
d_mask['\n'] &= ~FLD_D;
d_mask[(u_char)*optarg] |= FLD_D;