-
Notifications
You must be signed in to change notification settings - Fork 1
/
basicmain.cpp
265 lines (203 loc) · 6.17 KB
/
basicmain.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
// 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 <stdio.h>
#include <ctype.h> // isdigit
#include <string.h> // strlen
#include <ctype.h>
#include <memory.h> // memset
#include <malloc.h>
#include "basic.h"
//
// STATUS 4-19-02:
//
// BUGS
// A. Need to report error on LPRINT@
// A. DIM A$,B% not supported (see wheel.bas)
// b. Add PRINT USING "!";"ABC";"DEF" format.
// c. Bug? defstr a:a="fred":defint a. Lose memory?
// d. BUG: hold key down, move focus out of window (or click and hold title bar), release key. Key up lost / bit stuck in map.
// e. Upon a line change due to a return or next, the trace window doesn't print out the new line number.
// f. ConWin title is hardcoded to debug window.
// g. When basic first run, window sometimes opens off screen.
// h. In Win95, when you close the console with close box, get a system error message.
// i. PRINT USING"## ,##";L;M; Not suported (used in strek40a.bas and others)
// J. IF A < > 5 THEN 10 doesn't work. (note space < >). Found one program (wumpus*) that did this.
// k. for x=0 to 1 step 0:next should be infinte loop, but its not. Also, forx=1to1step0 is not infinte loop in real l2 basic
// l. Double click on basic window title bar makes it full screen
// m. 10 if a$="<RETURN GO TO NEXT LINE>" then ..... cases and END (I think the file loader is stopping, no error)
// n. 2085 ford=1to4:nextd ' comment Gives a SYNTAX ERROR
//
//************************
/*
* Allocate an execution context for basic.
* This current implementation only allows one basic process, but could
* be easily modified to use malloc for the creation of multiple process.
*/
struct BasicCode* BasicCreateProcess(struct IoConsole* primary_con, IoConsole* debug_con)
{
static struct BasicCode code;
static bool already_called = FALSE;
if (already_called)
return NULL;
already_called = TRUE;
/*
* Set up consoles
*/
memset(&code, 0, sizeof(code));
BasicSetDefaultState(&code);
code.std_con=primary_con;
code.debug_con=DebugAttachConsole(&code, debug_con);
return &code;
}
/* Free any process resources */
void BasicDestroyProcess(struct BasicCode* p)
{
BasicSetDefaultState(p);
}
/* Sets numerical variables to 0. Frees and clears strings */
void BasicClear(struct BasicCode* p)
{
short i;
for (i=0; i < MAX_VARIABLES; i++)
if (p->variables[i].label)
if (p->variables[i].value.type_flags&VT_STRING && p->variables[i].value.value.string)
free(p->variables[i].value.value.string);
memset(p->variables, 0, sizeof(p->variables));
}
/*
* Reset a struct BasicCode so it is in the state for a new 'Run'
* Frees and zeros any allocated variables, resets the stack pointer, resets data pointer, and variable default types
* Sets up code just as if a new Run is about to happen.
*/
void BasicSetDefaultState(struct BasicCode* p)
{
short i;
BasicClear(p);
if (p->print_con)
{
io_close(p->print_con);
p->print_con=NULL;
}
for (i=0; i < 26; i++)
p->deftab[i]=VT_FLOAT;
p->stack.sp=0;
p->onerror=0;
DoRestore(p);
p->pc = &p->image[0];
if (p->std_con)
io_inkey(p->std_con); // clear the inkey buffer (it was remembering the last key press)
}
/*
* Given an execution context, run the code in it.
*/
int BasicRun(struct BasicCode* code)
{
int err;
code->run_mode=RM_RUNNING;
err = Interpret(code);
code->run_mode=RM_IDLE;
if (code->print_con)
{
io_close(code->print_con);
code->print_con=NULL;
}
if (err==ERR_WINDOWCLOSED)
return err;
if (err != ERR_NORMAL_END)
{
int current_line = code->current_line_start_pc[2] +
(code->current_line_start_pc[3]<<8);
if (io_get_cursor(code->std_con)%code->std_con->io_width!=0)
io_putc(code->std_con,'\n');
if (err==ERR_BREAK)
{
io_printf1i(code->std_con, "Break in %d\n", current_line);
}
else
{
io_putc(code->std_con, '?');
io_putstr(code->std_con, LookupErrorString(err));
io_printf1i(code->std_con, " Error in %d\n", current_line);
if (code->debug_con)
DebugErrorDump(code, code->debug_con, err);
}
}
io_putstr(code->std_con, "*** BASIC Execution Complete\n");
return err;
}
bool BasicSaveFile(struct BasicCode* code, char* filespec)
{
struct IoConsole* io;
io = IoFileWriteOpen(filespec);
if (io)
{
DebugShowList(code, io);
io_close(io);
return TRUE;
}
return FALSE;
}
bool BasicLoadFile(struct BasicCode* process, char* filespec)
{
unsigned char buffer[128*1024]; // temp storage for read files
FILE* fp;
size_t size;
BasicSetDefaultState(process);
fp=fopen(filespec, "rb");
size = fread(buffer, sizeof (buffer[0]), sizeof (buffer), fp);
if (size == 0 || size == sizeof(buffer))
{
return FALSE;
}
fclose(fp);
if (isgraph(buffer[0]) || isspace(buffer[0])) // ASCII File
{
buffer[size] = 0; // mark end
return Tokenize((char*)buffer, process);
}
else
{
return LoadAlreadyTokenized(buffer, size, process);
}
}
bool LoadAlreadyTokenized(unsigned char* source, int size, struct BasicCode* code)
{
int i, last;
unsigned char* m_memory;
m_memory = code->image;
if (size > MAX_IMAGESIZE)
{
io_putstr(code->std_con,"code to large\n");
return FALSE;
}
if (source[0] != 0xFF) // BASIC disk images always start with 0xFF
{
io_putstr(code->std_con, "Not a TRS-80 L2 BASIC tokenized file\n");
return FALSE;
}
i = 0; // basic program address
memcpy(m_memory+i, source+1, size-1);
//
// A BASIC file is a dump of the RAM image. Scan and patchup address
// in case the memory location this BASIC program was placed at has changed.
// (BASIC RAM images have the format <addr of next line><line number>...<0><addr of next line>...)
//
do
{
last = i;
i = i+4;
while (m_memory[i])
i++;
i++;
m_memory[last] = i&0xFF;
m_memory[last+1] = i>>8;
} while (m_memory[i] || m_memory[i+1]); // two bytes of zero mark the end of a basic program
i = i + 2; // point to the first byte past the basic program in memory
return TRUE;
}