Commit | Line | Data |
---|---|---|
bfd7932e MV |
1 | TYPE |
2 | SCM_TO_TYPE_PROTO (SCM val) | |
3 | { | |
4 | if (SCM_I_INUMP (val)) | |
5 | { | |
6 | scm_t_signed_bits n = SCM_I_INUM (val); | |
7 | #if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SIZEOF_SCM_T_BITS | |
8 | return n; | |
9 | #else | |
10 | if (n >= TYPE_MIN && n <= TYPE_MAX) | |
11 | return n; | |
12 | else | |
13 | { | |
14 | goto out_of_range; | |
15 | } | |
16 | #endif | |
17 | } | |
18 | else if (SCM_BIGP (val)) | |
19 | { | |
20 | if (TYPE_MIN >= SCM_MOST_NEGATIVE_FIXNUM | |
21 | && TYPE_MAX <= SCM_MOST_POSITIVE_FIXNUM) | |
22 | goto out_of_range; | |
23 | else if (TYPE_MIN >= LONG_MIN && TYPE_MAX <= LONG_MAX) | |
24 | { | |
25 | if (mpz_fits_slong_p (SCM_I_BIG_MPZ (val))) | |
26 | { | |
27 | long n = mpz_get_si (SCM_I_BIG_MPZ (val)); | |
28 | #if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SCM_SIZEOF_LONG | |
29 | return n; | |
30 | #else | |
31 | if (n >= TYPE_MIN && n <= TYPE_MAX) | |
32 | return n; | |
33 | else | |
34 | goto out_of_range; | |
35 | #endif | |
36 | } | |
37 | else | |
38 | goto out_of_range; | |
39 | } | |
40 | else | |
41 | { | |
42 | scm_t_intmax n; | |
43 | size_t count; | |
44 | ||
45 | if (mpz_sizeinbase (SCM_I_BIG_MPZ (val), 2) | |
46 | > CHAR_BIT*sizeof (scm_t_uintmax)) | |
47 | goto out_of_range; | |
48 | ||
49 | mpz_export (&n, &count, 1, sizeof (scm_t_uintmax), 0, 0, | |
50 | SCM_I_BIG_MPZ (val)); | |
51 | ||
52 | if (mpz_sgn (SCM_I_BIG_MPZ (val)) >= 0) | |
53 | { | |
54 | if (n < 0) | |
55 | goto out_of_range; | |
56 | } | |
57 | else | |
58 | { | |
59 | n = -n; | |
60 | if (n >= 0) | |
61 | goto out_of_range; | |
62 | } | |
63 | ||
64 | if (n >= TYPE_MIN && n <= TYPE_MAX) | |
65 | return n; | |
66 | else | |
67 | { | |
68 | out_of_range: | |
69 | scm_out_of_range (NULL, val); | |
70 | return 0; | |
71 | } | |
72 | } | |
73 | } | |
74 | else | |
75 | { | |
76 | scm_wrong_type_arg_msg (NULL, 0, val, "exact integer"); | |
77 | return 0; | |
78 | } | |
79 | } | |
80 | ||
81 | SCM | |
82 | SCM_FROM_TYPE_PROTO (TYPE val) | |
83 | { | |
84 | #if SIZEOF_TYPE != 0 && SIZEOF_TYPE < SIZEOF_SCM_T_BITS | |
85 | return SCM_I_MAKINUM (val); | |
86 | #else | |
87 | if (SCM_FIXABLE (val)) | |
88 | return SCM_I_MAKINUM (val); | |
89 | else if (val >= LONG_MIN && val <= LONG_MAX) | |
90 | { | |
91 | SCM z = scm_double_cell (scm_tc16_big, 0, 0, 0); | |
92 | mpz_init_set_si (SCM_I_BIG_MPZ (z), val); | |
93 | return z; | |
94 | } | |
95 | else | |
96 | { | |
97 | SCM z = scm_double_cell (scm_tc16_big, 0, 0, 0); | |
98 | mpz_init (SCM_I_BIG_MPZ (z)); | |
99 | if (val < 0) | |
100 | { | |
101 | val = -val; | |
102 | mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0, | |
103 | &val); | |
104 | mpz_neg (SCM_I_BIG_MPZ (z), SCM_I_BIG_MPZ (z)); | |
105 | } | |
106 | else | |
107 | mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0, | |
108 | &val); | |
109 | return z; | |
110 | } | |
111 | #endif | |
112 | } | |
113 | ||
114 | /* clean up */ | |
115 | #undef TYPE | |
116 | #undef TYPE_MIN | |
117 | #undef TYPE_MAX | |
118 | #undef SIZEOF_TYPE | |
119 | #undef SCM_TO_TYPE_PROTO | |
120 | #undef SCM_FROM_TYPE_PROTO | |
121 | ||
122 | /* | |
123 | Local Variables: | |
124 | c-file-style: "gnu" | |
125 | End: | |
126 | */ |