/
Variant.c
167 lines (137 loc) · 4.06 KB
/
Variant.c
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
165
166
/*
* Internal Variant datatype conversions. The Parser/compiler will have
* to insert calls to these before passing variant variables to
* functions expecting non-variant intrinsics...
*
* Copyright (c) 1998 Ryan C. Gordon and Gregory S. Read.
*/
#include "Variant.h"
void __freeVariant(STATEPARAMS, PVariant var)
/*
* Free the resources occupied by a variant. The variant (and contained
* data) is inaccessible after this call.
*
* params : var == variant to free.
* returns : void.
*/
{
if (var->type == STRING)
__freeString(STATEARGS, var->data._string);
__memFree(STATEARGS, var);
} /* __freeVariant */
int __variantToInt(STATEPARAMS, PVariant var)
{
int retVal = 0;
switch (var->type)
{
case INTEGER:
retVal = var->data._integer;
break;
case LONG:
retVal = (int) var->data._long;
break;
case SINGLE:
retVal = (int) var->data._single;
break;
case DOUBLE:
retVal = (int) var->data._double;
break;
default:
__runtimeError(STATEARGS, ERR_ILLEGAL_FUNCTION_CALL); /* !!! Is that the right error code? */
break;
} /* switch */
return(retVal);
} /* __variantToInt */
long __variantToLong(STATEPARAMS, PVariant var)
{
long retVal = 0;
switch (var->type)
{
case INTEGER:
retVal = (long) var->data._integer;
break;
case LONG:
retVal = var->data._long;
break;
case SINGLE:
retVal = (long) var->data._single;
break;
case DOUBLE:
retVal = (long) var->data._double;
break;
default:
__runtimeError(STATEARGS, ERR_ILLEGAL_FUNCTION_CALL); /* !!! Is that the right error code? */
break;
} /* switch */
return(retVal);
} /* __variantToLong */
float __variantToFloat(STATEPARAMS, PVariant var)
{
float retVal = 0;
switch (var->type)
{
case INTEGER:
retVal = (float) var->data._integer;
break;
case LONG:
retVal = (float) var->data._long;
break;
case SINGLE:
retVal = var->data._single;
break;
case DOUBLE:
retVal = (float) var->data._double;
break;
default:
__runtimeError(STATEARGS, ERR_ILLEGAL_FUNCTION_CALL); /* !!! Is that the right error code? */
break;
} /* switch */
return(retVal);
} /* __variantToFloat */
double __variantToDouble(STATEPARAMS, PVariant var)
{
double retVal = 0;
switch (var->type)
{
case INTEGER:
retVal = (double) var->data._integer;
break;
case LONG:
retVal = (double) var->data._long;
break;
case SINGLE:
retVal = (double) var->data._single;
break;
case DOUBLE:
retVal = var->data._double;
break;
default:
__runtimeError(STATEARGS, ERR_ILLEGAL_FUNCTION_CALL); /* !!! Is that the right error code? */
break;
} /* switch */
return(retVal);
} /* __variantToDouble */
PBasicString __variantToString(STATEPARAMS, PVariant pVar, boolean byRef)
/*
* The parser/compiler will be responsible for free()ing the return value
* from this call after the program is done with it...
*
* params : pVar == Variant to convert.
* byRef == (true) to return the PBasicString stored in the
* variant structure, (false) to make a new copy of it.
*/
{
PBasicString retVal = NULL;
/* !!! Should we auto-convert numbers? How does BASIC do this? */
if (pVar->type == STRING)
{
if (byRef)
retVal = pVar->data._string;
else
__assignString(STATEARGS, &retVal, pVar->data._string);
} /* if */
else
__runtimeError(STATEARGS, ERR_ILLEGAL_FUNCTION_CALL); /* !!! Is that the right error code? */
return(retVal);
} /* __variantToString */
/* end of Variant.c ... */