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
|
(*
Copyright (c) 2000
Cambridge University Technical Services Limited
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
(**********************************************************************
* Import Signatures
**********************************************************************)
signature ForeignExceptionSig_Import =
sig
val Foreign : string -> exn
end;
(**********************************************************************
* Functor Definition
**********************************************************************)
functor CONVERSIONS (
structure LowerLevel : LowerLevelSig
structure CallWithConv : CallWithConvSig
structure ForeignException : ForeignExceptionSig_Import
sharing type LowerLevel.vol = CallWithConv.vol
sharing LowerLevel.Ctype = CallWithConv.Ctype
) : ConversionsSig =
struct
open LowerLevel;
open LowerLevel.Ctype;
open CallWithConv;
open ForeignException;
(* Generally we don't want to convert a unit value into a void except in the
case when we're returning a void result from a callback. Just return
zero in that case. *)
val VOID = mkConversion (fn _ => ()) (fn () => toCint 0) Cvoid
local
fun int2bool 0 = false
| int2bool _ = true
fun bool2int false = 0
| bool2int true = 1
in
val BOOL = mapConversion (int2bool,bool2int) INT;
end
fun ID x = x;
val POINTER = mkConversion ID ID (Cpointer Cvoid)
fun POINTERTO conv =
let val (from,to,ctype) = breakConversion conv
in mkConversion (from o deref) (address o to) (Cpointer ctype)
end;
(***
The conversion STRING' is Like STRING conversion,
except when converting from C to ML, it also copes with NULL pointers.
(However, the ML string created is identical to the ML string created
when converting a pointer to a null.)
***)
val STRING' = mkConversion
(fn v => if fromCint v = 0 then "" else fromCstring v)
toCstring
(Cpointer Cchar);
end (* struct *)
|
