1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* this file is #include'd (x times) by convert.c */
/* You need to define the following macros before including this
template. They are undefined at the end of this file to give a
clean slate for the next inclusion.
- CTYPE
The type of an element of the C array, for example 'char'.
- FROM_CTYPE
The function that converts a CTYPE to a SCM, for example
scm_from_char.
- UVEC_TAG
The tag of a suitable uniform vector that can hold the CTYPE, for
example 's8'.
- UVEC_CTYPE
The C type of an element of the uniform vector, for example
scm_t_int8.
- SCM2CTYPES
The name of the 'SCM-to-C' function, for example scm_c_scm2chars.
- CTYPES2SCM
The name of the 'C-to-SCM' function, for example, scm_c_chars2scm.
- CTYPES2UVECT
The name of the 'C-to-uniform-vector' function, for example
scm_c_chars2byvect. It will create a uniform vector of kind
UVEC_TAG.
- CTYPES2UVECT_2
The name of a second 'C-to-uniform-vector' function. Leave
undefined if you want only one such function.
- CTYPE_2
- UVEC_TAG_2
- UVEC_CTYPE_2
The tag and C type of the second kind of uniform vector, for use
with the function described above.
*/
/* The first level does not expand macros in the arguments. */
#define paste(a1,a2,a3) a1##a2##a3
#define stringify(a) #a
/* But the second level does. */
#define F(pre,T,suf) paste(pre,T,suf)
#define S(T) stringify(T)
/* Convert a vector, list or uniform vector into a C array. If the
result array in argument 2 is NULL, malloc() a new one.
*/
CTYPE *
SCM2CTYPES (SCM obj, CTYPE *data)
{
size_t len, i;
UVEC_CTYPE *uvec_elements;
obj = F(scm_any_to_,UVEC_TAG,vector) (obj);
len = scm_c_uniform_vector_length (obj);
uvec_elements = F(scm_,UVEC_TAG,vector_elements) (obj);
if (data == NULL)
data = scm_malloc (len * sizeof (CTYPE));
for (i = 0; i < len; i++)
data[i] = uvec_elements[i];
scm_uniform_vector_release (obj);
return data;
}
/* Converts a C array into a vector. */
SCM
CTYPES2SCM (const CTYPE *data, long n)
{
long i;
SCM v;
v = scm_c_make_vector (n, SCM_UNSPECIFIED);
for (i = 0; i < n; i++)
SCM_VECTOR_SET (v, i, FROM_CTYPE (data[i]));
return v;
}
/* Converts a C array into a uniform vector. */
SCM
CTYPES2UVECT (const CTYPE *data, long n)
{
long i;
SCM uvec;
UVEC_CTYPE *uvec_elements;
uvec = F(scm_make_,UVEC_TAG,vector) (scm_from_long (n), SCM_UNDEFINED);
uvec_elements = F(scm_,UVEC_TAG,vector_elements) (uvec);
for (i = 0; i < n; i++)
uvec_elements[i] = data[i];
scm_uniform_vector_release (uvec);
return uvec;
}
#ifdef CTYPE2UVECT_2
SCM
CTYPES2UVECT_2 (const CTYPE_2 *data, long n)
{
long i;
SCM uvec;
UVEC_CTYPE_2 *uvec_elements;
uvec = F(scm_make_,UVEC_TAG_2,vector) (scm_from_long (n), SCM_UNDEFINED);
uvec_elements = F(scm_,UVEC_TAG_2,vector_elements) (obj);
for (i = 0; i < n; i++)
v[i] = data[i];
scm_uniform_vector_release (uvec);
return uvec;
}
#endif
#undef paste
#undef stringify
#undef F
#undef S
#undef CTYPE
#undef FROM_CTYPE
#undef UVEC_TAG
#undef UVEC_CTYPE
#undef SCM2CTYPES
#undef CTYPES2SCM
#undef CTYPES2UVECT
#ifdef CTYPES2UVECT_2
#undef CTYPES2UVECT_2
#undef CTYPE_2
#undef UVEC_TAG_2
#undef UVEC_CTYPE_2
#endif
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|