TYPE
SCM_TO_TYPE_PROTO (SCM val)
{
if (SCM_I_INUMP (val))
{
scm_t_signed_bits n = SCM_I_INUM (val);
#if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SIZEOF_SCM_T_BITS
return n;
#else
if (n >= TYPE_MIN && n <= TYPE_MAX)
return n;
else
{
goto out_of_range;
}
#endif
}
else if (SCM_BIGP (val))
{
if (TYPE_MIN >= SCM_MOST_NEGATIVE_FIXNUM
&& TYPE_MAX <= SCM_MOST_POSITIVE_FIXNUM)
goto out_of_range;
else if (TYPE_MIN >= LONG_MIN && TYPE_MAX <= LONG_MAX)
{
if (mpz_fits_slong_p (SCM_I_BIG_MPZ (val)))
{
long n = mpz_get_si (SCM_I_BIG_MPZ (val));
#if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SCM_SIZEOF_LONG
return n;
#else
if (n >= TYPE_MIN && n <= TYPE_MAX)
return n;
else
goto out_of_range;
#endif
}
else
goto out_of_range;
}
else
{
scm_t_intmax n;
size_t count;
if (mpz_sizeinbase (SCM_I_BIG_MPZ (val), 2)
> CHAR_BIT*sizeof (scm_t_uintmax))
goto out_of_range;
mpz_export (&n, &count, 1, sizeof (scm_t_uintmax), 0, 0,
SCM_I_BIG_MPZ (val));
if (mpz_sgn (SCM_I_BIG_MPZ (val)) >= 0)
{
if (n < 0)
goto out_of_range;
}
else
{
n = -n;
if (n >= 0)
goto out_of_range;
}
if (n >= TYPE_MIN && n <= TYPE_MAX)
return n;
else
{
out_of_range:
scm_i_range_error (val,
scm_from_signed_integer (TYPE_MIN),
scm_from_signed_integer (TYPE_MAX));
return 0;
}
}
}
else
{
scm_wrong_type_arg_msg (NULL, 0, val, "exact integer");
return 0;
}
}
int scm_is_fixnum(SCM x) {
return SCM_I_INUMP(x);
}
