1
/* This code in included by numbers.c to generate integer conversion
2
functions like scm_to_int and scm_from_int. It is only for signed
3
types, see conv-uinteger.i.c for the unsigned variant.
6
/* You need to define the following macros before including this
7
template. They are undefined at the end of this file to give a
8
clean slate for the next inclusion.
10
TYPE - the integral type to be converted
11
TYPE_MIN - the smallest representable number of TYPE
12
TYPE_MAX - the largest representable number of TYPE
13
SIZEOF_TYPE - the size of TYPE, equal to "sizeof (TYPE)" but
14
in a form that can be computed by the preprocessor.
15
When this number is 0, the preprocessor is not used
16
to select which code to compile; the most general
19
SCM_TO_TYPE_PROTO(arg), SCM_FROM_TYPE_PROTO(arg)
20
- These two macros should expand into the prototype
21
for the two defined functions, without the return
27
SCM_TO_TYPE_PROTO (SCM val)
29
if (SCM_I_INUMP (val))
31
scm_t_signed_bits n = SCM_I_INUM (val);
32
#if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SIZEOF_SCM_T_BITS
35
if (n >= TYPE_MIN && n <= TYPE_MAX)
43
else if (SCM_BIGP (val))
45
if (TYPE_MIN >= SCM_MOST_NEGATIVE_FIXNUM
46
&& TYPE_MAX <= SCM_MOST_POSITIVE_FIXNUM)
48
else if (TYPE_MIN >= LONG_MIN && TYPE_MAX <= LONG_MAX)
50
if (mpz_fits_slong_p (SCM_I_BIG_MPZ (val)))
52
long n = mpz_get_si (SCM_I_BIG_MPZ (val));
53
#if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SCM_SIZEOF_LONG
56
if (n >= TYPE_MIN && n <= TYPE_MAX)
70
if (mpz_sizeinbase (SCM_I_BIG_MPZ (val), 2)
71
> CHAR_BIT*sizeof (scm_t_uintmax))
74
mpz_export (&n, &count, 1, sizeof (scm_t_uintmax), 0, 0,
77
if (mpz_sgn (SCM_I_BIG_MPZ (val)) >= 0)
89
if (n >= TYPE_MIN && n <= TYPE_MAX)
94
scm_i_range_error (val,
95
scm_from_signed_integer (TYPE_MIN),
96
scm_from_signed_integer (TYPE_MAX));
103
scm_wrong_type_arg_msg (NULL, 0, val, "exact integer");
109
SCM_FROM_TYPE_PROTO (TYPE val)
111
#if SIZEOF_TYPE != 0 && SIZEOF_TYPE < SIZEOF_SCM_T_BITS
112
return SCM_I_MAKINUM (val);
114
if (SCM_FIXABLE (val))
115
return SCM_I_MAKINUM (val);
116
else if (val >= LONG_MIN && val <= LONG_MAX)
117
return scm_i_long2big (val);
120
SCM z = scm_double_cell (scm_tc16_big, 0, 0, 0);
121
mpz_init (SCM_I_BIG_MPZ (z));
125
mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0,
127
mpz_neg (SCM_I_BIG_MPZ (z), SCM_I_BIG_MPZ (z));
130
mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0,
142
#undef SCM_TO_TYPE_PROTO
143
#undef SCM_FROM_TYPE_PROTO