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1 | (* Copyright (C) 1999-2008 Henry Cejtin, Matthew Fluet, Suresh |
2 | * Jagannathan, and Stephen Weeks. | |
3 | * Copyright (C) 1997-2000 NEC Research Institute. | |
4 | * | |
5 | * MLton is released under a BSD-style license. | |
6 | * See the file MLton-LICENSE for details. | |
7 | *) | |
8 | ||
9 | structure CUtil: C_UTIL = | |
10 | struct | |
11 | open Int | |
12 | ||
13 | structure Pointer = Primitive.MLton.Pointer | |
14 | ||
15 | fun makeLength (sub, term) p = | |
16 | let | |
17 | fun loop i = | |
18 | if term (sub (p, i)) | |
19 | then i | |
20 | else loop (i +? 1) | |
21 | in loop 0 | |
22 | end | |
23 | ||
24 | fun toArrayOfLength (s: 'a, | |
25 | sub: 'a * int -> 'b, | |
26 | n: int) : 'b array = | |
27 | let | |
28 | val (a, _) = | |
29 | Array.unfoldi | |
30 | (n, (), fn (i, ()) => | |
31 | (sub (s, i), ())) | |
32 | in | |
33 | a | |
34 | end | |
35 | ||
36 | structure C_Pointer = | |
37 | struct | |
38 | type t = C_Pointer.t | |
39 | val null = Pointer.toWord Pointer.null | |
40 | fun isNull p = p = null | |
41 | end | |
42 | ||
43 | structure C_String = | |
44 | struct | |
45 | type t = C_String.t | |
46 | ||
47 | fun sub (cs, i) = | |
48 | Primitive.Char8.idFromWord8 | |
49 | (Pointer.getWord8 | |
50 | (Pointer.fromWord cs, | |
51 | C_Ptrdiff.fromInt i)) | |
52 | ||
53 | fun update (cs, i, c) = | |
54 | Pointer.setWord8 | |
55 | (Pointer.fromWord cs, | |
56 | C_Ptrdiff.fromInt i, | |
57 | Primitive.Char8.idToWord8 c) | |
58 | ||
59 | val length = makeLength (sub, fn #"\000" => true | _ => false) | |
60 | ||
61 | fun toCharArrayOfLength (cs, n) = | |
62 | toArrayOfLength (cs, sub, n) | |
63 | ||
64 | fun toStringOfLength (cs, n) = | |
65 | String.unsafeFromArray | |
66 | (CharArray.fromPoly (toCharArrayOfLength (cs, n))) | |
67 | ||
68 | fun toString cs = toStringOfLength (cs, length cs) | |
69 | end | |
70 | ||
71 | structure C_StringArray = | |
72 | struct | |
73 | type t = C_StringArray.t | |
74 | ||
75 | fun sub (css: t, i) = | |
76 | (Pointer.toWord o Pointer.getCPointer) | |
77 | (Pointer.fromWord css, | |
78 | C_Ptrdiff.fromInt i) | |
79 | ||
80 | val length = makeLength (sub, C_Pointer.isNull) | |
81 | ||
82 | val toArrayOfLength = | |
83 | fn (css, n) => | |
84 | toArrayOfLength (css, C_String.toString o sub, n) | |
85 | ||
86 | fun toArray css = toArrayOfLength (css, length css) | |
87 | ||
88 | val toList = Array.toList o toArray | |
89 | ||
90 | (* The C side converts the last element of the array, "", | |
91 | * to the null terminator that C primitives expect. | |
92 | * As far as C can tell, the other elements of the array | |
93 | * are just char*'s. | |
94 | *) | |
95 | fun fromList l = | |
96 | let | |
97 | val (a, _) = | |
98 | Array.unfoldi | |
99 | (1 +? List.length l, l, fn (_, l) => | |
100 | case l of | |
101 | [] => (NullString.empty, l) | |
102 | | s::l => (NullString.nullTerm s, l)) | |
103 | in | |
104 | a | |
105 | end | |
106 | end | |
107 | end |