-
Notifications
You must be signed in to change notification settings - Fork 1
/
variables.cpp
437 lines (361 loc) · 9.03 KB
/
variables.cpp
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
// awBASIC interpreter (c) 2002 Anthony J. Wood
// www.awsoftware.org
//
// This file is part of awbasic.
// awbasic is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
#include <malloc.h>
#include <string.h>
#include <ctype.h>
#include "basic.h"
void SetVariable(union VariableValue* storage, union VariableValue newvalue, unsigned char type)
{
if (type&VT_STRING)
free(storage->string);
CopyVariableValue(storage, &newvalue);
}
unsigned int CountArrayDims(struct BasicCode* code, const unsigned char* expr)
{
int err;
unsigned int numdims, len;
struct TypedValue dummy;
numdims=0;
while (TRUE)
{
err = EvalExpression(expr, &len, code, &dummy);
expr+=len;
if (err!=ERR_OKAY)
return numdims;
numdims++;
SkipWhiteSpace(&expr);
if (*expr!=',')
return numdims;
expr++;
}
}
int CalcIndexValues(struct BasicCode* code, const unsigned char* expr, unsigned int* numdims, unsigned int** indexvals, unsigned int* len)
{
int err, isize;
unsigned int i, ii;
struct TypedValue size;
const unsigned char* expr_start = expr;
*numdims = CountArrayDims(code, expr);
*indexvals = (unsigned int*)malloc(*numdims*sizeof(int));
if (*indexvals==0)
return ERR_OUTOFMEM;
for (i=1; i <= *numdims; i++)
{
err = EvalExpression(expr, &ii, code, &size);
expr+=ii;
if (err!=ERR_OKAY)
return err;
if (!IsNumber(&size))
return ERR_TM;
isize = IntVal(&size);
if (isize < 0)
return ERR_FC;
(*indexvals)[*numdims-i]=isize; // put in reverse order, compatible with L2 Basic
SkipWhiteSpace(&expr);
if (*expr!=',')
if (i!=*numdims)
return ERR_SYNTAX;
expr++;
}
if (*(expr-1)!=')')
return ERR_SYNTAX;
if (len)
*len = (expr - expr_start);
return ERR_OKAY;
}
int SimpleParseVariable(unsigned char deftab[], const unsigned char* expr, unsigned char* type, unsigned short* label, unsigned int* len)
{
const unsigned char* expr_start = expr;
/*
* First, decode variable label (up to two significant chars)
*/
SkipWhiteSpace(&expr);
if (!isalpha(*expr))
return ERR_SYNTAX;
*label = tolower(*expr);
expr++;
if (isalnum(*expr))
{
*label = (*label)|(tolower(*expr)<<8);
expr++;
while (isalnum(*expr)) // skip end (non-significant) portion of variable name
expr++;
}
/*
* Next, What Type is this variable?
*/
SkipWhiteSpace(&expr); // Allow A $
if (*expr=='$')
{
*type = VT_STRING;
expr++;
}
else if (*expr=='%')
{
*type = VT_INT;
expr++;
}
else if (*expr=='#')
{
*type = VT_DOUBLE;
expr++;
}
else if (*expr=='!')
{
*type = VT_FLOAT;
expr++;
}
else
*type = deftab[((*label)&0xFF)-'a'];
if (len)
*len = (expr - expr_start);
return ERR_OKAY;
}
int ParseVariable(struct BasicCode* code, const unsigned char* expr, union VariableValue** value_ptr, unsigned char* type, unsigned int* len)
{
const unsigned char* expr_start = expr;
unsigned short label;
unsigned int i, *ap;
int err;
/*
* Parse label and type. EG A1$
*/
err=SimpleParseVariable(code->deftab, expr, type, &label, len);
if (err!=ERR_OKAY)
return err;
expr+=*len;
/*
* Check if this is an array
*/
SkipWhiteSpace(&expr); // Allow A $ (4) = "fred"
if (*expr=='(')
{
(*type)|= VT_ARRAY;
expr++;
}
/*
* Look up the variable to get is storage location.
*/
for (i=0; i < MAX_VARIABLES && code->variables[i].label!=0; i++)
{
if (code->variables[i].label == label && code->variables[i].value.type_flags==(*type))
break;
}
if (i >= MAX_VARIABLES)
return ERR_OUTOFMEM;
/*
* If variable doesn't exist in table, create it.
*/
if (code->variables[i].label==0)
{
code->variables[i].value.type_flags=*type;
code->variables[i].label=label;
if ((*type)&VT_ARRAY)
{
/*
* create array stucture with default of DIM A(10, ...,10)
* Note that 10 is 0 through 10, inclusive (11 total)
* int 0: number of dimensions (n)
* int 1..n: size for each dimension
* n X VariableValue's
*/
unsigned int numdims,allocsize;
unsigned int* ap;
numdims = CountArrayDims(code, expr);
allocsize = 0;
for (unsigned int ii=0; ii < numdims; ii++)
allocsize = allocsize*(11) + (11);
allocsize*=sizeof(union VariableValue);
allocsize+=(1+numdims)*sizeof(int);
ap=(unsigned int*)malloc(allocsize);
if (ap==0)
return ERR_OUTOFMEM;
memset(ap, 0, allocsize);
ap[0]=numdims;
while (numdims)
{
ap[numdims]=11;
numdims--;
}
code->variables[i].value.value.array = ap;
}
}
/*
* Set value_ptr to the variable locations storage.
* If this is an array, the calc the correct array entry
*/
if ((*type)&VT_ARRAY)
{
unsigned int index =0;
unsigned int numdims, *indexvals;
ap = code->variables[i].value.value.array;
err = CalcIndexValues(code, expr, &numdims, &indexvals, &i);
expr+=i;
if (err!=ERR_OKAY)
{
free(indexvals);
return err;
}
for (i=0; i < numdims; i++)
{
if (indexvals[i] >= ap[i+1])
{
free(indexvals);
return ERR_BS;
}
index = index*ap[i+1]+indexvals[i];
}
*value_ptr = (union VariableValue *)((unsigned char*)ap+sizeof(int)*(numdims+1)+sizeof(union VariableValue)*index);
free(indexvals);
}
else
{
*value_ptr = &code->variables[i].value.value;
}
if ((*type)&VT_STRING) // if this string location uninitilized, initilize it.
{
if ((*value_ptr)->string==NULL)
{
(*value_ptr)->string = (char*)malloc(1);
(*value_ptr)->string[0]=0;
}
}
/*
* Calc length of source characters parsed and return
*/
if (len)
*len = (expr - expr_start);
(*type)&= (~VT_ARRAY); // This routine returns a single typed value, never an "array"
return ERR_OKAY;
}
int CreateArray(struct Variable vartab[], unsigned short label, unsigned char type, unsigned int* ap)
{
for (int i=0; i < MAX_VARIABLES && vartab[i].label!=0; i++)
if (vartab[i].label == label && vartab[i].value.type_flags==(type|VT_ARRAY))
return ERR_DD;
if (i >= MAX_VARIABLES)
return ERR_OUTOFMEM;
vartab[i].label=label;
vartab[i].value.type_flags=type|VT_ARRAY;
vartab[i].value.value.array=ap;
return ERR_OKAY;
}
short IntVal(struct TypedValue* tv)
{
if (tv->type_flags&VT_INT)
return tv->value.intval;
else if (tv->type_flags&VT_FLOAT)
return (int)tv->value.floatval;
else if (tv->type_flags&VT_DOUBLE)
return (int)tv->value.doubleval;
else return 0; // Should never happen
}
float FloatVal(struct TypedValue* tv)
{
if (tv->type_flags&VT_FLOAT)
return tv->value.floatval;
else if (tv->type_flags&VT_INT)
return (float)tv->value.intval;
else if (tv->type_flags&VT_DOUBLE)
return (float)tv->value.doubleval;
else return 0.0; // Should never happen
}
double DoubleVal(struct TypedValue* tv)
{
if (tv->type_flags&VT_DOUBLE)
return tv->value.doubleval;
else if (tv->type_flags&VT_FLOAT)
return (double)tv->value.floatval;
else if (tv->type_flags&VT_INT)
return (double)tv->value.intval;
else return 0.0; // Should never happen
}
bool IsNumber(struct TypedValue* tv)
{
return !(tv->type_flags&VT_STRING);
}
bool IsNumberT(unsigned char type)
{
return !(type&VT_STRING);
}
bool IsInt(struct TypedValue* tv)
{
return tv->type_flags&VT_INT;
}
void CopyVariableValue(VariableValue* d, VariableValue* s)
{
memcpy(d, s, sizeof(VariableValue));
}
void ConvertType(struct TypedValue* v, unsigned char newtype)
{
if (newtype&VT_INT)
v->value.intval = IntVal(v);
else if (newtype&VT_FLOAT)
v->value.floatval = FloatVal(v);
else if (newtype&VT_DOUBLE)
v->value.doubleval=DoubleVal(v);
else
return;
v->type_flags=newtype;
}
// ***************************** OLD CODE
#if 0
float LookupFloat(struct Variable vartab[], struct Variable *v)
{
for (int i=0; i < MAX_VARIABLES && vartab[i].label!=0; i++)
{
if (vartab[i].label == v->label && vartab[i].value.type_flags&VT_FLOAT)
return vartab[i].value.value.floatval;
}
return 0.0; // un-initilized variables are zero
}
int SetFloat(struct Variable vartab[], struct Variable *v, Variable** vp)
{
for (int i=0; i < MAX_VARIABLES && vartab[i].label!=0; i++)
{
if (vartab[i].label == v->label && vartab[i].value.type_flags&VT_FLOAT)
{
vartab[i].value.value.floatval = v->value.value.floatval;
if (vp)
*vp = &vartab[i];
return ERR_OKAY;
}
}
if (i < MAX_VARIABLES)
{
vartab[i] = *v;
if (vp)
*vp = &vartab[i];
return ERR_OKAY;
}
return ERR_OUTOFMEM;
}
char* LookupString(struct Variable vartab[], struct Variable *v)
{
for (int i=0; i < MAX_VARIABLES && vartab[i].label!=0; i++)
{
if (vartab[i].label == v->label && vartab[i].value.type_flags&VT_STRING)
return vartab[i].value.value.string;
}
return ""; // un-initilized variable
}
int SetString(struct Variable vartab[], struct Variable *v)
{
for (int i=0; i < MAX_VARIABLES && vartab[i].label!=0; i++)
if (vartab[i].label == v->label && vartab[i].value.type_flags&VT_STRING)
break;
if (i < MAX_VARIABLES)
{
vartab[i]=*v; // NOTE: This takes the pointer in v, so it shouldn't be free
v->value.value.string = NULL;
return ERR_OKAY;
}
return ERR_OUTOFMEM;
}
#endif