HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 9d3ebce4 MV |
1 | /* This code in included by number.s.c to generate integer conversion |
| 2 | functions like scm_to_int and scm_from_int. It is only for | |
| 3 | unsigned types, see conv-integer.i.c for the signed variant. | |
| 4 | */ | |
| 5 | ||
| 6 | /* You need to define the following macros before including this | |
| 7 | template. They are undefined at the end of this file to giove a | |
| 8 | clean slate for the next inclusion. | |
| 9 | ||
| 10 | TYPE - the integral type to be converted | |
| 11 | TYPE_MIN - the smallest representable number of TYPE, typically 0. | |
| 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 | |
| 17 | code is always used. | |
| 18 | ||
| 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 | |
| 22 | type. | |
| 23 | ||
| 24 | */ | |
| 25 | ||
| bfd7932e MV |
26 | TYPE |
| 27 | SCM_TO_TYPE_PROTO (SCM val) | |
| 28 | { | |
| 29 | if (SCM_I_INUMP (val)) | |
| 30 | { | |
| 31 | scm_t_signed_bits n = SCM_I_INUM (val); | |
| 32 | if (n >= 0 | |
| 33 | && ((scm_t_uintmax)n) >= TYPE_MIN && ((scm_t_uintmax)n) <= TYPE_MAX) | |
| 34 | return n; | |
| 35 | else | |
| 36 | { | |
| 37 | out_of_range: | |
| 1713d319 MV |
38 | scm_i_range_error (val, |
| 39 | scm_from_unsigned_integer (TYPE_MIN), | |
| 40 | scm_from_unsigned_integer (TYPE_MAX)); | |
| bfd7932e MV |
41 | return 0; |
| 42 | } | |
| 43 | } | |
| 44 | else if (SCM_BIGP (val)) | |
| 45 | { | |
| 46 | if (TYPE_MAX <= SCM_MOST_POSITIVE_FIXNUM) | |
| 47 | goto out_of_range; | |
| 48 | else if (TYPE_MAX <= ULONG_MAX) | |
| 49 | { | |
| 50 | if (mpz_fits_ulong_p (SCM_I_BIG_MPZ (val))) | |
| 51 | { | |
| 52 | unsigned long n = mpz_get_ui (SCM_I_BIG_MPZ (val)); | |
| 53 | #if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SCM_SIZEOF_LONG | |
| 54 | return n; | |
| 55 | #else | |
| 56 | if (n >= TYPE_MIN && n <= TYPE_MAX) | |
| 57 | return n; | |
| 58 | else | |
| 59 | goto out_of_range; | |
| 60 | #endif | |
| 61 | } | |
| 62 | else | |
| 63 | goto out_of_range; | |
| 64 | } | |
| 65 | else | |
| 66 | { | |
| 67 | scm_t_uintmax n; | |
| 68 | size_t count; | |
| 69 | ||
| 70 | if (mpz_sgn (SCM_I_BIG_MPZ (val)) < 0) | |
| 71 | goto out_of_range; | |
| 72 | ||
| 73 | if (mpz_sizeinbase (SCM_I_BIG_MPZ (val), 2) | |
| 74 | > CHAR_BIT*sizeof (TYPE)) | |
| 75 | goto out_of_range; | |
| 76 | ||
| 77 | mpz_export (&n, &count, 1, sizeof (TYPE), 0, 0, SCM_I_BIG_MPZ (val)); | |
| 78 | ||
| 79 | if (n >= TYPE_MIN && n <= TYPE_MAX) | |
| 80 | return n; | |
| 81 | else | |
| 82 | goto out_of_range; | |
| 83 | } | |
| 84 | } | |
| 85 | else | |
| 86 | { | |
| 87 | scm_wrong_type_arg_msg (NULL, 0, val, "exact integer"); | |
| 88 | return 0; | |
| 89 | } | |
| 90 | } | |
| 91 | ||
| 92 | SCM | |
| 93 | SCM_FROM_TYPE_PROTO (TYPE val) | |
| 94 | { | |
| 95 | #if SIZEOF_TYPE != 0 && SIZEOF_TYPE < SIZEOF_SCM_T_BITS | |
| 96 | return SCM_I_MAKINUM (val); | |
| 97 | #else | |
| 98 | if (SCM_POSFIXABLE (val)) | |
| 99 | return SCM_I_MAKINUM (val); | |
| 100 | else if (val <= ULONG_MAX) | |
| c71b0706 | 101 | return scm_i_ulong2big (val); |
| bfd7932e MV |
102 | else |
| 103 | { | |
| 104 | SCM z = scm_double_cell (scm_tc16_big, 0, 0, 0); | |
| 105 | mpz_init (SCM_I_BIG_MPZ (z)); | |
| 106 | mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0, &val); | |
| 107 | return z; | |
| 108 | } | |
| 109 | #endif | |
| 110 | } | |
| 111 | ||
| 112 | #undef TYPE | |
| 113 | #undef TYPE_MIN | |
| 114 | #undef TYPE_MAX | |
| 115 | #undef SIZEOF_TYPE | |
| 116 | #undef SCM_TO_TYPE_PROTO | |
| 117 | #undef SCM_FROM_TYPE_PROTO | |
| 118 |