/* Tiny Basic Intermediate Language Interpreter -- 2004 July 19 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h> /* added 08 Oct 31 */
#include <conio.h>
char *ExplainErr(int code);
/* Default input/output file names, if defined (omit otherwise)... */
#define DefaultInputFile "TBasm.txt"
#define DefaultOutputFile "TBout.txt"
/* File input/output function macros (adjust for C++ framework) */
#define FileType FILE*
#define IoFileClose(fi) fclose(fi)
#define InFileChar(fi) CfileRead(fi)
#define OutFileChar(fi,ch) fputc(ch,fi)
#define ScreenChar(ch) con_printf("%c",ch)
#define KeyInChar (char)getchar()
#define NeedsEcho true
#define BreakTest Broken
/* File input/output function macros (Qt examples:) */
/* #define FileType QFile* */
/* #define IoFileClose(fi) fi->close() */
/* #define InFileChar(fi) (fi->atEnd()?'\0':fi->getch()) */
/* #define OutFileChar(fi,ch) fi->putch(ch) */
char CfileRead(FileType fi) { /* C file reader, returns '\0' on eof */
if (chn == EOF) return '\0';
return (char)chn;} /* ~CfileRead */
/* Constants: */
#define aByte unsigned char
#define CoreTop 65536 /* Core size */
#define UserProg 32 /* Core address of front of Basic program */
#define EndUser 34 /* Core address of end of stack/user space */
#define EndProg 36 /* Core address of end of Basic program */
#define GoStkTop 38 /* Core address of Gosub stack top */
#define LinoCore 40 /* Core address of "Current BASIC line number" */
#define ILPCcore 42 /* Core address of "IL Program Counter" */
#define BPcore 44 /* Core address of "Basic Pointer" */
#define SvPtCore 46 /* Core address of "Saved Pointer" */
#define InLine 48 /* Core address of input line */
#define ExpnStk 128 /* Core address of expression stack (empty) */
#define TabHere 191 /* Core address of output line size, for tabs */
#define WachPoint 255 /* Core address of debug watchpoint USR */
#define ColdGo 256 /* Core address of nominal restart USR */
#define WarmGo 259 /* Core address of nominal warm start USR */
#define InchSub 262 /* Core address of nominal char input USR */
#define OutchSub 265 /* Core address of nominal char output USR */
#define BreakSub 268 /* Core address of nominal break test USR */
#define DumpSub 273 /* Core address of debug core dump USR */
#define PeekSub 276 /* Core address of nominal byte peek USR */
#define Peek2Sub 277 /* Core address of nominal 2-byte peek USR */
#define PokeSub 280 /* Core address of nominal byte poke USR */
#define TrLogSub 283 /* Core address of debug trace log USR */
#define BScode 271 /* Core address of backspace code */
#define CanCode 272 /* Core address of line cancel code */
#define ILfront 286 /* Core address of IL code address */
#define BadOp 15 /* illegal op, default IL code */
/* Pascal habits die hard.. */
#define true 1
#define false 0
/* debugging stuff... */
#define DEBUGON 1 /* 1 enables \t Debugging toggle, 0 disables */
#define LOGSIZE 4096 /* how much to log */
static int Debugging = 0; /* >0 enables debug code */
int DebugLog[LOGSIZE]; /* quietly logs recent activity */
int LogHere = 0; /* current index in DebugLog */
int Watcher = 0, Watchee; /* memory watchpoint */
/* Static/global data: */
aByte Core[CoreTop]; /* everything goes in here */
aByte DeCaps[128]; /* capitalization table */
int Lino, ILPC; /* current line #, IL program counter */
int BP, SvPt; /* current, saved TB parse pointer */
int SubStk, ExpnTop; /* stack pointers */
int InLend, SrcEnd; /* current input line & TB source end */
int UserEnd;
int ILend, XQhere; /* end of IL code, start of execute loop */
int Broken = false; /* =true to stop execution or listing */
FileType inFile = NULL; /* from option '-i' or user menu/button */
FileType oFile = NULL; /* from option '-o' or user menu/button */
/************************* Memory Utilities.. *************************/
void Poke2(int loc, int valu) { /* store integer as two bytes */
Core[loc] = (aByte)((valu>>8)&255); /* nominally Big-Endian */
Core[loc+1] = (aByte)(valu&255);} /* ~Poke2 */
int Peek2(int loc) { /* fetch integer from two bytes */
return ((int)Core[loc])*256 + ((int)Core[loc+1]);} /* ~Peek2 */
/************************** I/O Utilities... **************************/
void Ouch(char ch) { /* output char to stdout */
if (oFile != NULL) { /* there is an output file.. */
if (ch>=' ') OutFileChar(oFile,ch);
else if (ch == '\r') OutFileChar(oFile,'\n');}
if (ch=='\r') {
Core[TabHere] = 0; /* keep count of how long this line is */
ScreenChar('\n');}
else if (ch>=' ') if (ch<='~') { /* ignore non-print control chars */
Core[TabHere]++;
ScreenChar(ch);}} /* ~Ouch */
char Inch(void) { /* read input character from stdin or file */
char ch;
if (inFile != NULL) { /* there is a file to get input from.. */
ch = InFileChar(inFile);
if (ch == '\n') ch = '\r';
if (ch == '\0') { /* switch over to console input at eof */
IoFileClose(inFile);
inFile = NULL;}
else {
Ouch(ch); /* echo input to screen (but not output file) */
return ch;}}
ch = KeyInChar; /* get input from stdin */
// ---Leency
// int __stdcall con_getch(void);
// For normal characters function returns ASCII-code.
// For extended characters (eg, Fx, and arrows), first function call
// returns 0 and second call returns the extended code (similar to the
// DOS-function input). Starting from version 7, after closing the
// console window, this function returns 0.
if (ch == 0) {
ch = (char)con_getch();
if (ch
== 0) exit(0); /* Kolibri specific - user closed window */ return 0; /* Do not show anything on press extchar */
}
if (ch==13) con_printf ("\n");
if (ch==8) con_printf ("\b ");
if (NeedsEcho) ScreenChar(ch); /* alternative input may need this */
if (oFile != NULL) OutFileChar(oFile,ch); /* echo it to output file */
if (ch == '\n') {
ch = '\r'; /* convert line end to TB standard */
Core[TabHere] = 0;} /* reset tab counter */
return ch;} /* ~Inch */
int StopIt(void) {return BreakTest;} /* ~StopIt, .. not implemented */
void OutStr(char* theMsg) { /* output a string to the console */
while (*theMsg != '\0') Ouch(*theMsg++);} /* ~OutStr */
void OutLn(void) { /* terminate output line to the console */
OutStr("\r");} /* ~OutLn */
void OutInt(int theNum) { /* output a number to the console */
if (theNum<0) {
Ouch('-');
theNum = -theNum;}
if (theNum>9) OutInt(theNum/10);
Ouch((char)(theNum%10+48));} /* ~OutInt */
/*********************** Debugging Utilities... ***********************/
void OutHex(int num, int nd) { /* output a hex number to the console */
if (nd>1) OutHex(num>>4, nd-1);
num = num&15;
if (num>9) Ouch((char)(num+55));
else Ouch((char)(num+48));} /* ~OutHex */
void ShowSubs(void) { /* display subroutine stack for debugging */
int ix;
OutLn(); OutStr(" [Stk "); OutHex(SubStk,5);
for (ix=SubStk; ix<UserEnd; ix++) {
OutStr(" ");
OutInt(Peek2(ix++));}
OutStr("]");} /* ~ShowSubs */
void ShowExSt(void) { /* display expression stack for debugging */
int ix;
OutLn(); OutStr(" [Exp "); OutHex(ExpnTop,3);
if ((ExpnTop&1)==0) for (ix=ExpnTop; ix<ExpnStk; ix++) {
OutStr(" ");
OutInt((int)((short)Peek2(ix++)));}
else for (ix=ExpnTop; ix<ExpnStk; ix++) {
OutStr(".");
OutInt((int)Core[ix]);}
OutStr("]");} /* ~ShowExSt */
void ShowVars(int whom) { /* display vars for debugging */
int ix, valu = 1, prior = 1;
if (whom==0) whom = 26; else {
whom = (whom>>1)&31; /* whom is a specified var, or 0 */
valu = whom;}
OutLn(); OutStr(" [Vars");
for (ix=valu; ix<=whom; ix++) { /* all non-zero vars, or else whom */
valu = (int)((short)Peek2(ix*2+ExpnStk));
if (valu==0) if (prior==0) continue; /* omit multiple 0s */
prior = valu;
OutStr(" ");
Ouch((char)(ix+64)); /* show var name */
OutStr("=");
OutInt(valu);}
OutStr("]");} /* ~ShowVars */
void ShoMemDump(int here, int nlocs) { /* display hex memory dump */
int temp, thar = here&-16;
while (nlocs>0) {
temp = thar;
OutLn();
OutHex(here,4);
OutStr(": ");
while (thar<here) {OutStr(" "); thar++;}
do {
OutStr(" ");
if (nlocs-- >0) OutHex(Core[here],2);
else OutStr(" ");}
while (++here%16 !=0);
OutStr(" ");
while (temp<thar) {OutStr(" "); temp++;}
while (thar<here) {
if (nlocs<0) if ((thar&15) >= nlocs+16) break;
temp = Core[thar++];
if (temp == (int)'\r') Ouch('\\');
else if (temp<32) Ouch('`');
else if (temp>126) Ouch('~');
else Ouch((char)temp);}}
OutLn();} /* ~ShoMemDump */
void ShoLogVal(int item) { /* format & output one activity log item */
int valu = DebugLog[item];
OutLn();
if (valu < -65536) { /* store to a variable */
Ouch((char)(((valu>>17)&31)+64));
OutStr("=");
OutInt((valu&0x7FFF)-(valu&0x8000));}
else if (valu < -32768) { /* error # */
OutStr("Err ");
OutInt(-valu-32768);}
else if (valu<0) { /* only logs IL sequence changes */
OutStr(" IL+");
OutHex(-Peek2(ILfront)-valu,3);}
else if (valu<65536) { /* TinyBasic line # */
OutStr("#");
OutInt(valu);}
else { /* poke memory byte */
OutStr("!");
OutHex(valu,4);
OutStr("=");
OutInt(valu>>16);}} /* ~ShoLogVal */
void ShowLog(void) { /* display activity log for debugging */
int ix;
OutLn();
OutStr("*** Activity Log @ ");
OutInt(LogHere);
OutStr(" ***");
if (LogHere >= LOGSIZE) /* circular, show only last 4K activities */
for (ix=(LogHere&(LOGSIZE-1)); ix<LOGSIZE; ix++) ShoLogVal(ix);
for (ix=0; ix<(LogHere&(LOGSIZE-1)); ix++) ShoLogVal(ix);
OutLn();
OutStr("*****");
OutLn();} /* ~ShowLog */
void LogIt(int valu) { /* insert this valu into activity log */
DebugLog[(LogHere++)&(LOGSIZE-1)] = valu;}
/************************ Utility functions... ************************/
void WarmStart(void) { /* initialize existing program */
UserEnd = Peek2(EndUser);
SubStk = UserEnd; /* empty subroutine, expression stacks */
Poke2(GoStkTop,SubStk);
ExpnTop = ExpnStk;
Lino = 0; /* not in any line */
ILPC = 0; /* start IL at front */
SvPt = InLine;
BP = InLine;
Core[BP] = 0;
Core[TabHere] = 0;
InLend = InLine;} /* ~WarmStart */
void ColdStart(void) { /* initialize program to empty */
if (Peek2(ILfront) != ILfront+2) ILend = Peek2(ILfront)+0x800;
Poke2(UserProg,(ILend+255)&-256); /* start Basic shortly after IL */
if (CoreTop>65535) {
Poke2(EndUser,65534);
Poke2(65534,0xDEAD);}
else Poke2(EndUser,CoreTop);
WarmStart();
SrcEnd = Peek2(UserProg);
Poke2(SrcEnd++,0);
Poke2(EndProg,++SrcEnd);} /* ~ColdStart */
void TBerror(void) { /* report interpreter error */
if (ILPC == 0) return; /* already reported it */
OutLn();
LogIt(-ILPC-32768);
OutStr("Tiny Basic error #"); /* IL address is the error # */
OutInt(ILPC-Peek2(ILfront));
// siemargl - add textual explain
OutStr(" - ");
OutStr(ExplainErr(ILPC-Peek2(ILfront)));
if (Lino>0) { /* Lino=0 if in command line */
OutStr(" at line ");
OutInt(Lino);}
OutLn();
if (Debugging>0) { /* some extra info if debugging.. */
ShowSubs();
ShowExSt();
ShowVars(0);
OutStr(" [BP=");
OutHex(BP,4);
OutStr(", TB@");
OutHex(Peek2(UserProg),4);
OutStr(", IL@");
OutHex(Peek2(ILfront),4);
OutStr("]");
ShoMemDump((BP-30)&-16,64);}
Lino = 0; /* restart interpreter at front */
ExpnTop = ExpnStk; /* with empty expression stack */
ILPC = 0; /* cheap error test; interp reloads it from ILfront */
BP = InLine;} /* ~TBerror */
void PushSub(int valu) { /* push value onto Gosub stack */
if (SubStk<=SrcEnd) TBerror(); /* overflow: bumped into program end */
else {
SubStk = SubStk-2;
Poke2(GoStkTop,SubStk);
Poke2(SubStk,valu);}
if (Debugging>0) ShowSubs();} /* ~PushSub */
int PopSub(void) { /* pop value off Gosub stack */
if (SubStk>=Peek2(EndUser)-1) { /* underflow (nothing in stack).. */
TBerror();
return -1;}
else {
if (Debugging>1) ShowSubs();
SubStk = SubStk+2;
Poke2(GoStkTop,SubStk);
return Peek2(SubStk-2);}} /* ~PopSub */
void PushExBy(int valu) { /* push byte onto expression stack */
if (ExpnTop<=InLend) TBerror(); /* overflow: bumped into input line */
else Core[--ExpnTop] = (aByte)(valu&255);
if (Debugging>0) ShowExSt();} /* ~PushExBy */
int PopExBy(void) { /* pop byte off expression stack */
if (ExpnTop<ExpnStk) return (int)Core[ExpnTop++];
TBerror(); /* underflow (nothing in stack) */
return -1;} /* ~PopExBy */
void PushExInt(int valu) { /* push integer onto expression stack */
ExpnTop = ExpnTop-2;
if (ExpnTop<InLend) TBerror(); /* overflow: bumped into input line */
else Poke2(ExpnTop,valu);
if (Debugging>0) ShowExSt();} /* ~PushExInt */
int PopExInt(void) { /* pop integer off expression stack */
if (++ExpnTop<ExpnStk) return (int)((short)Peek2((ExpnTop++)-1));
TBerror(); /* underflow (nothing in stack) */
return -1;} /* ~PopExInt */
int DeHex(char* txt, int ndigs) { /* decode hex -> int */
int num = 0;
char ch = ' ';
while (ch<'0') /* first skip to num... */
if (ch == '\0') return -1; else ch = DeCaps[((int)*txt++)&127];
if (ch>'F' || ch>'9' && ch<'A') return -1; /* not hex */
while ((ndigs--) >0) { /* only get requested digits */
if (ch<'0' || ch>'F') return num; /* not a hex digit */
if (ch>='A') num = num*16-55+((int)ch); /* A-F */
else if (ch<='9') num = num*16-48+((int)ch); /* 0-9 */
else return num; /* something in between, i.e. not hex */
ch = DeCaps[((int)*txt++)&127];}
return num;} /* ~DeHex */
int SkipTo(int here, char fch) { /* search for'd past next marker */
while (true) {
char ch = (char)Core[here++]; /* look at next char */
if (ch == fch) return here; /* got it */
if (ch == '\0') return --here;}} /* ~SkipTo */
int FindLine(int theLine) { /* find theLine in TB source code */
int ix;
int here = Peek2(UserProg); /* start at front */
while (true) {
ix = Peek2(here++);
if (theLine<=ix || ix==0) return --here; /* found it or overshot */
here = SkipTo(++here, '\r');} /* skip to end of this line */
} /* ~FindLine */
void GoToLino(void) { /* find line # Lino and set BP to its front */
int here;
if (Lino <= 0) { /* Lino=0 is just command line (OK).. */
BP = InLine;
if (DEBUGON>0) LogIt(0);
return;}
if (DEBUGON>0) LogIt(Lino);
if (Debugging>0) {OutStr(" [#"); OutInt(Lino); OutStr("]");}
BP = FindLine(Lino); /* otherwise try to find it.. */
here = Peek2(BP++);
if (here==0) TBerror(); /* ran off the end, error off */
else if (Lino != here) TBerror(); /* not there */
else BP++;} /* ~GoToLino */ /* got it */
void ListIt(int frm, int too) { /* list the stored program */
char ch;
int here;
if (frm==0) { /* 0,0 defaults to all; n,0 defaults to n,n */
too = 65535;
frm = 1;}
else if (too==0) too = frm;
here = FindLine(frm); /* try to find first line.. */
while (!StopIt()) {
frm = Peek2(here++); /* get this line's # to print it */
if (frm>too || frm==0) break;
here++;
OutInt(frm);
Ouch(' ');
do { /* print the text */
ch = (char)Core[here++];
Ouch(ch);}
while (ch>'\r');}} /* ~ListIt */
void ConvtIL(char* txt) { /* convert & load TBIL code */
int valu;
ILend = ILfront+2;
Poke2(ILfront,ILend); /* initialize pointers as promised in TBEK */
Poke2(ColdGo+1,ILend);
Core[ILend] = (aByte)BadOp; /* illegal op, in case nothing loaded */
if (txt == NULL) return;
while (*txt != '\0') { /* get the data.. */
while (*txt > '\r') txt++; /* (no code on 1st line) */
if (*txt++ == '\0') break; /* no code at all */
while (*txt > ' ') txt++; /* skip over address */
if (*txt++ == '\0') break;
while (true) {
valu = DeHex(txt++, 2); /* get a byte */
if (valu<0) break; /* no more on this line */
Core[ILend++] = (aByte)valu; /* insert this byte into code */
txt++;}}
XQhere = 0; /* requires new XQ to initialize */
Core[ILend] = 0;} /* ~ConvtIL */
void LineSwap(int here) { /* swap SvPt/BP if here is not in InLine */
if (here<InLine || here>=InLend) {
here = SvPt;
SvPt = BP;
BP = here;}
else SvPt = BP;} /* ~LineSwap */
/************************** Main Interpreter **************************/
void Interp(void) {
char ch; /* comments from TinyBasic Experimenter's Kit, pp.15-21 */
int op, ix, here, chpt; /* temps */
Broken = false; /* initialize this for possible later test */
while (true) {
if (StopIt()) {
Broken = false;
OutLn();
OutStr("*** User Break ***");
TBerror();}
if (ILPC==0) {
ILPC = Peek2(ILfront);
if (DEBUGON>0) LogIt(-ILPC);
if (Debugging>0) {
OutLn(); OutStr("[IL="); OutHex(ILPC,4); OutStr("]");}}
if (DEBUGON>0) if (Watcher>0) { /* check watchpoint.. */
if (((Watchee<0) && (Watchee+256+(int)Core[Watcher]) !=0)
|| ((Watchee >= 0) && (Watchee==(int)Core[Watcher]))) {
OutLn();
OutStr("*** Watched ");
OutHex(Watcher,4);
OutStr(" = ");
OutInt((int)Core[Watcher]);
OutStr(" *** ");
Watcher = 0;
TBerror();
continue;}}
op = (int)Core[ILPC++];
if (Debugging>0) {
OutLn(); OutStr("[IL+"); OutHex(ILPC-Peek2(ILfront)-1,3);
OutStr("="); OutHex(op,2); OutStr("]");}
switch (op>>5) {
default: switch (op) {
case 15:
TBerror();
return;
/* SX n 00-07 Stack Exchange. */
/* Exchange the top byte of computational stack with */
/* that "n" bytes into the stack. The top/left byte of the stack is */
/* considered to be byte 0, so SX 0 does nothing. */
case 1: case 2: case 3: case 4: case 5: case 6: case 7:
if (ExpnTop+op>=ExpnStk) { /* swap is below stack depth */
TBerror();
return;}
ix = (int)Core[ExpnTop];
Core[ExpnTop] = Core[ExpnTop+op];
Core[ExpnTop+op] = (aByte)ix;
if (Debugging>0) ShowExSt();
break;
/* LB n 09nn Push Literal Byte onto Stack. */
/* This adds one byte to the expression stack, which */
/* is the second byte of the instruction. An error stop will occur if */
/* the stack overflows. */
case 9:
PushExBy((int)Core[ILPC++]); /* push IL byte */
break;
/* LN n 0Annnn Push Literal Number. */
/* This adds the following two bytes to the */
/* computational stack, as a 16-bit number. Stack overflow results in */
/* an error stop. Numbers are assumed to be Big-Endian. */
case 10:
PushExInt(Peek2(ILPC++)); /* get next 2 IL bytes */
ILPC++;
break;
/* DS 0B Duplicate Top Number (two bytes) on Stack. */
/* An error stop will occur if there are less than 2 */
/* bytes (1 int) on the expression stack or if the stack overflows. */
case 11:
op = ExpnTop;
ix = PopExInt();
if (ILPC == 0) break; /* underflow */
ExpnTop = op;
PushExInt(ix);
break;
/* SP 0C Stack Pop. */
/* The top two bytes are removed from the expression */
/* stack and discarded. Underflow results in an error stop. */
case 12:
ix = PopExInt();
if (Debugging>0) ShowExSt();
break;
/* SB 10 Save BASIC Pointer. */
/* If BASIC pointer is pointing into the input line */
/* buffer, it is copied to the Saved Pointer; otherwise the two */
/* pointers are exchanged. */
case 16:
LineSwap(BP);
break;
/* RB 11 Restore BASIC Pointer. */
/* If the Saved Pointer points into the input line */
/* buffer, it is replaced by the value in the BASIC pointer; */
/* otherwise the two pointers are exchanged. */
case 17:
LineSwap(SvPt);
break;
/* FV 12 Fetch Variable. */
/* The top byte of the computational stack is used to */
/* index into Page 00. It is replaced by the two bytes fetched. Error */
/* stops occur with stack overflow or underflow. */
case 18:
op = PopExBy();
if (ILPC != 0) PushExInt(Peek2(op));
if (Debugging>1) ShowVars(op);
break;
/* SV 13 Store Variable. */
/* The top two bytes of the computational stack are */
/* stored into memory at the Page 00 address specified by the third */
/* byte on the stack. All three bytes are deleted from the stack. */
/* Underflow results in an error stop. */
case 19:
ix = PopExInt();
op = PopExBy();
if (ILPC == 0) break;
Poke2(op,ix);
if (DEBUGON>0) LogIt((ix&0xFFFF)+((op-256)<<16));
if (Debugging>0) {ShowVars(op); if (Debugging>1) ShowExSt();}
break;
/* GS 14 GOSUB Save. */
/* The current BASIC line number is pushed */
/* onto the BASIC region of the control stack. It is essential that */
/* the IL stack be empty for this to work properly but no check is */
/* made for that condition. An error stop occurs on stack overflow. */
case 20:
PushSub(Lino); /* push line # (possibly =0) */
break;
/* RS 15 Restore Saved Line. */
/* Pop the top two bytes off the BASIC region of the */
/* control stack, making them the current line number. Set the BASIC */
/* pointer at the beginning of that line. Note that this is the line */
/* containing the GOSUB which caused the line number to be saved. As */
/* with the GS opcode, it is essential that the IL region of the */
/* control stack be empty. If the line number popped off the stack */
/* does not correspond to a line in the BASIC program an error stop */
/* occurs. An error stop also results from stack underflow. */
case 21:
Lino = PopSub(); /* get line # (possibly =0) from pop */
if (ILPC != 0) GoToLino() ; /* stops run if error */
break;
/* GO 16 GOTO. */
/* Make current the BASIC line whose line number is */
/* equal to the value of the top two bytes in the expression stack. */
/* That is, the top two bytes are popped off the computational stack, */
/* and the BASIC program is searched until a matching line number is */
/* found. The BASIC pointer is then positioned at the beginning of */
/* that line and the RUN mode flag is turned on. Stack underflow and */
/* non-existent BASIC line result in error stops. */
case 22:
ILPC = XQhere; /* the IL assumes an implied NX */
if (DEBUGON>0) LogIt(-ILPC);
Lino = PopExInt();
if (ILPC != 0) GoToLino() ; /* stops run if error */
break;
/* NE 17 Negate (two's complement). */
/* The number in the top two bytes of the expression */
/* stack is replaced with its negative. */
case 23:
ix = PopExInt();
if (ILPC != 0) PushExInt(-ix);
break;
/* AD 18 Add. */
/* Add the two numbers represented by the top four */
/* bytes of the expression stack, and replace them with the two-byte */
/* sum. Stack underflow results in an error stop. */
case 24:
ix = PopExInt();
op = PopExInt();
if (ILPC != 0) PushExInt(op+ix);
break;
/* SU 19 Subtract. */
/* Subtract the two-byte number on the top of the */
/* expression stack from the next two bytes and replace the 4 bytes */
/* with the two-byte difference. */
case 25:
ix = PopExInt();
op = PopExInt();
if (ILPC != 0) PushExInt(op-ix);
break;
/* MP 1A Multiply. */
/* Multiply the two numbers represented by the top 4 */
/* bytes of the computational stack, and replace them with the least */
/* significant 16 bits of the product. Stack underflow is possible. */
case 26:
ix = PopExInt();
op = PopExInt();
if (ILPC != 0) PushExInt(op*ix);
break;
/* DV 1B Divide. */
/* Divide the number represented by the top two bytes */
/* of the computational stack into that represented by the next two. */
/* Replace the 4 bytes with the quotient and discard the remainder. */
/* This is a signed (two's complement) integer divide, resulting in a */
/* signed integer quotient. Stack underflow or attempted division by */
/* zero result in an error stop. */
case 27:
ix = PopExInt();
op = PopExInt();
if (ix == 0) TBerror(); /* divide by 0.. */
else if (ILPC != 0) PushExInt(op/ix);
break;
/* CP 1C Compare. */
/* The number in the top two bytes of the expression */
/* stack is compared to (subtracted from) the number in the 4th and */
/* fifth bytes of the stack, and the result is determined to be */
/* Greater, Equal, or Less. The low three bits of the third byte mask */
/* a conditional skip in the IL program to test these conditions; if */
/* the result corresponds to a one bit, the next byte of the IL code */
/* is skipped and not executed. The three bits correspond to the */
/* conditions as follows: */
/* bit 0 Result is Less */
/* bit 1 Result is Equal */
/* bit 2 Result is Greater */
/* Whether the skip is taken or not, all five bytes are deleted from */
/* the stack. This is a signed (two's complement) comparison so that */
/* any positive number is greater than any negative number. Multiple */
/* conditions, such as greater-than-or-equal or unequal (i.e.greater- */
/* than-or-less-than), may be tested by forming the condition mask */
/* byte of the sum of the respective bits. In particular, a mask byte */
/* of 7 will force an unconditional skip and a mask byte of 0 will */
/* force no skip. The other 5 bits of the control byte are ignored. */
/* Stack underflow results in an error stop. */
case 28:
ix = PopExInt();
op = PopExBy();
ix = PopExInt()-ix; /* <0 or =0 or >0 */
if (ILPC == 0) return; /* underflow.. */
if (ix<0) ix = 1;
else if (ix>0) ix = 4; /* choose the bit to test */
else ix = 2;
if ((ix&op)>0) ILPC++; /* skip next IL op if bit =1 */
if (Debugging>0) ShowExSt();
break;
/* NX 1D Next BASIC Statement. */
/* Advance to next line in the BASIC program, if in */
/* RUN mode, or restart the IL program if in the command mode. The */
/* remainder of the current line is ignored. In the Run mode if there */
/* is another line it becomes current with the pointer positioned at */
/* its beginning. At this time, if the Break condition returns true, */
/* execution is aborted and the IL program is restarted after */
/* printing an error message. Otherwise IL execution proceeds from */
/* the saved IL address (see the XQ instruction). If there are no */
/* more BASIC statements in the program an error stop occurs. */
case 29:
if (Lino == 0) ILPC = 0;
else {
BP = SkipTo(BP, '\r'); /* skip to end of this line */
Lino = Peek2(BP++); /* get line # */
if (Lino==0) { /* ran off the end */
TBerror();
break;}
else BP++;
ILPC = XQhere; /* restart at saved IL address (XQ) */
if (DEBUGON>0) LogIt(-ILPC);}
if (DEBUGON>0) LogIt(Lino);
if (Debugging>0) {OutStr(" [#"); OutInt(Lino); OutStr("]");}
break;
/* LS 1F List The Program. */
/* The expression stack is assumed to have two 2-byte */
/* numbers. The top number is the line number of the last line to be */
/* listed, and the next is the line number of the first line to be */
/* listed. If the specified line numbers do not exist in the program, */
/* the next available line (i.e. with the next higher line number) is */
/* assumed instead in each case. If the last line to be listed comes */
/* before the first, no lines are listed. If Break condition comes */
/* true during a List operation, the remainder of the listing is */
/* aborted. Zero is not a valid line number, and an error stop occurs */
/* if either line number specification is zero. The line number */
/* specifications are deleted from the stack. */
case 31:
op = 0;
ix = 0; /* The IL seems to assume we can handle zero */
while (ExpnTop<ExpnStk) { /* or more numbers, so get them.. */
op = ix;
ix = PopExInt();} /* get final line #, then initial.. */
if (op<0 || ix<0) TBerror();
else ListIt(ix,op);
break;
/* PN 20 Print Number. */
/* The number represented by the top two bytes of the */
/* expression stack is printed in decimal with leading zero */
/* suppression. If it is negative, it is preceded by a minus sign */
/* and the magnitude is printed. Stack underflow is possible. */
case 32:
ix = PopExInt();
if (ILPC != 0) OutInt(ix);
break;
/* PQ 21 Print BASIC String. */
/* The ASCII characters beginning with the current */
/* position of BASIC pointer are printed on the console. The string */
/* to be printed is terminated by quotation mark ("), and the BASIC */
/* pointer is left at the character following the terminal quote. An */
/* error stop occurs if a carriage return is imbedded in the string. */
case 33:
while (true) {
ch = (char)Core[BP++];
if (ch=='\"') break; /* done on final quote */
if (ch<' ') { /* error if return or other control char */
TBerror();
break;}
Ouch(ch);} /* print it */
break;
/* PT 22 Print Tab. */
/* Print one or more spaces on the console, ending at */
/* the next multiple of eight character positions (from the left */
/* margin). */
case 34:
do {Ouch(' ');} while (Core[TabHere]%8>0);
break;
/* NL 23 New Line. */
/* Output a carriage-return-linefeed sequence to the */
/* console. */
case 35:
Ouch('\r');
break;
/* PC "xxxx" 24xxxxxxXx Print Literal String. */
/* The ASCII string follows opcode and its */
/* last byte has the most significant bit set to one. */
case 36:
do {
ix = (int)Core[ILPC++];
Ouch((char)(ix&127)); /* strip high bit for output */
} while ((ix&128)==0);
break;
/* GL 27 Get Input Line. */
/* ASCII characters are accepted from console input */
/* to fill the line buffer. If the line length exceeds the available */
/* space, the excess characters are ignored and bell characters are */
/* output. The line is terminated by a carriage return. On completing */
/* one line of input, the BASIC pointer is set to point to the first */
/* character in the input line buffer, and a carriage-return-linefeed */
/* sequence is [not] output. */
case 39:
InLend = InLine;
while (true) { /* read input line characters... */
ch = Inch();
if (!ch) continue;
else if (ch=='\r') break; /* end of the line */
else if (ch=='\t') {
Debugging = (Debugging+DEBUGON)&1; /* maybe toggle debug */
ch = ' ';} /* convert tabs to space */
else if (ch==(char)Core[BScode]) { /* backspace code */
if (InLend>InLine) InLend--; /* assume console already */
else { /* backing up over front of line: just kill it.. */
Ouch('\r');
break;}}
else if (ch==(char)Core[CanCode]) { /* cancel this line */
InLend = InLine;
Ouch('\r'); /* also start a new input line */
break;}
else if (ch<' ') continue; /* ignore non-ASCII & controls */
else if (ch>'~') continue;
if (InLend>ExpnTop-2) continue; /* discard overrun chars */
/* Siemargl fix for not so smart consoles*/
if (ch != (char)Core[BScode])
Core[InLend++] = (aByte)ch;
} /* insert this char in buffer */
while (InLend>InLine && Core[InLend-1] == ' ')
InLend--; /* delete excess trailing spaces */
Core[InLend++] = (aByte) '\r'; /* insert final return & null */
Core[InLend] = 0;
BP = InLine;
break;
/* IL 2A Insert BASIC Line. */
/* Beginning with the current position of the BASIC */
/* pointer and continuing to the [end of it], the line is inserted */
/* into the BASIC program space; for a line number, the top two bytes */
/* of the expression stack are used. If this number matches a line */
/* already in the program it is deleted and the new one replaces it. */
/* If the new line consists of only a carriage return, it is not */
/* inserted, though any previous line with the same number will have */
/* been deleted. The lines are maintained in the program space sorted */
/* by line number. If the new line to be inserted is a different size */
/* than the old line being replaced, the remainder of the program is */
/* shifted over to make room or to close up the gap as necessary. If */
/* there is insufficient memory to fit in the new line, the program */
/* space is unchanged and an error stop occurs (with the IL address */
/* decremented). A normal error stop occurs on expression stack */
/* underflow or if the number is zero, which is not a valid line */
/* number. After completing the insertion, the IL program is */
/* restarted in the command mode. */
case 42:
Lino = PopExInt(); /* get line # */
if (Lino <= 0) { /* don't insert line #0 or negative */
if (ILPC != 0) TBerror();
else return;
break;}
while (((char)Core[BP]) == ' ') BP++; /* skip leading spaces */
if (((char)Core[BP]) == '\r') ix = 0; /* nothing to add */
else ix = InLend-BP+2; /* the size of the insertion */
op = 0; /* this will be the number of bytes to delete */
chpt = FindLine(Lino); /* try to find this line.. */
if (Peek2(chpt) == Lino) /* there is a line to delete.. */
op = (SkipTo(chpt+2, '\r')-chpt);
if (ix == 0) if (op==0) { /* nothing to add nor delete; done */
Lino = 0;
break;}
op = ix-op; /* = how many more bytes to add or (-)delete */
if (SrcEnd+op>=SubStk) { /* too big.. */
TBerror();
break;}
SrcEnd = SrcEnd+op; /* new size */
if (op>0) for (here=SrcEnd; (here--)>chpt+ix; )
Core[here] = Core[here-op]; /* shift backend over to right */
else if (op<0) for (here=chpt+ix; here<SrcEnd; here++)
Core[here] = Core[here-op]; /* shift it left to close gap */
if (ix>0) Poke2(chpt++,Lino); /* insert the new line # */
while (ix>2) { /* insert the new line.. */
Core[++chpt] = Core[BP++];
ix--;}
Poke2(EndProg,SrcEnd);
ILPC = 0;
Lino = 0;
if (Debugging>0) ListIt(0,0);
break;
/* MT 2B Mark the BASIC program space Empty. */
/* Also clears the BASIC region of the control stack */
/* and restart the IL program in the command mode. The memory bounds */
/* and stack pointers are reset by this instruction to signify empty */
/* program space, and the line number of the first line is set to 0, */
/* which is the indication of the end of the program. */
case 43:
ColdStart();
if (Debugging>0) {ShowSubs(); ShowExSt(); ShowVars(0);}
break;
/* XQ 2C Execute. */
/* Turns on RUN mode. This instruction also saves */
/* the current value of the IL program counter for use of the NX */
/* instruction, and sets the BASIC pointer to the beginning of the */
/* BASIC program space. An error stop occurs if there is no BASIC */
/* program. This instruction must be executed at least once before */
/* the first execution of a NX instruction. */
case 44:
XQhere = ILPC;
BP = Peek2(UserProg);
Lino = Peek2(BP++);
BP++;
if (Lino == 0) TBerror();
else if (Debugging>0)
{OutStr(" [#"); OutInt(Lino); OutStr("]");}
break;
/* WS 2D Stop. */
/* Stop execution and restart the IL program in the */
/* command mode. The entire control stack (including BASIC region) */
/* is also vacated by this instruction. This instruction effectively */
/* jumps to the Warm Start entry of the ML interpreter. */
case 45:
WarmStart();
if (Debugging>0) ShowSubs();
break;
/* US 2E Machine Language Subroutine Call. */
/* The top six bytes of the expression stack contain */
/* 3 numbers with the following interpretations: The top number is */
/* loaded into the A (or A and B) register; the next number is loaded */
/* into 16 bits of Index register; the third number is interpreted as */
/* the address of a machine language subroutine to be called. These */
/* six bytes on the expression stack are replaced with the 16-bit */
/* result returned by the subroutine. Stack underflow results in an */
/* error stop. */
case 46:
Poke2(LinoCore,Lino); /* bring these memory locations up.. */
Poke2(ILPCcore,ILPC); /* ..to date, in case user looks.. */
Poke2(BPcore,BP);
Poke2(SvPtCore,SvPt);
ix = PopExInt()&0xFFFF; /* datum A */
here = PopExInt()&0xFFFF; /* datum X */
op = PopExInt()&0xFFFF; /* nominal machine address */
if (ILPC == 0) break;
if (op>=Peek2(ILfront) && op<ILend) { /* call IL subroutine.. */
PushExInt(here);
PushExInt(ix);
PushSub(ILPC); /* push return location */
ILPC = op;
if (DEBUGON>0) LogIt(-ILPC);
break;}
switch (op) {
case WachPoint: /* we only do a few predefined functions.. */
Watcher = here;
if (ix>32767) ix = -(int)Core[here]-256;
Watchee = ix;
if (Debugging>0) {
OutLn(); OutStr("[** Watch "); OutHex(here,4); OutStr("]");}
PushExInt((int)Core[here]);
break;
case ColdGo:
ColdStart();
break;
case WarmGo:
WarmStart();
break;
case InchSub:
PushExInt((int)Inch());
break;
case OutchSub:
Ouch((char)(ix&127));
PushExInt(0);
break;
case BreakSub:
PushExInt(StopIt());
break;
case PeekSub:
PushExInt((int)Core[here]);
break;
case Peek2Sub:
PushExInt(Peek2(here));
break;
case PokeSub:
ix = ix&0xFF;
Core[here] = (aByte)ix;
PushExInt(ix);
if (DEBUGON>0) LogIt(((ix+256)<<16)+here);
Lino = Peek2(LinoCore); /* restore these pointers.. */
ILPC = Peek2(ILPCcore); /* ..in case user changed them.. */
BP = Peek2(BPcore);
SvPt = Peek2(SvPtCore);
break;
case DumpSub:
ShoMemDump(here,ix);
PushExInt(here+ix);
break;
case TrLogSub:
ShowLog();
PushExInt(LogHere);
break;
default: TBerror();}
break;
/* RT 2F IL Subroutine Return. */
/* The IL control stack is popped to give the address */
/* of the next IL instruction. An error stop occurs if the entire */
/* control stack (IL and BASIC) is empty. */
case 47:
ix = PopSub(); /* get return from pop */
if (ix<Peek2(ILfront) || ix>=ILend) TBerror();
else if (ILPC != 0) {
ILPC = ix;
if (DEBUGON>0) LogIt(-ILPC);}
break;
/* JS a 3000-37FF IL Subroutine Call. */
/* The least significant eleven bits of this */
/* 2-byte instruction are added to the base address of the IL program */
/* to become address of the next instruction. The previous contents */
/* of the IL program counter are pushed onto the IL region of the */
/* control stack. Stack overflow results in an error stop. */
case 48: case 49: case 50: case 51: case 52: case 53: case 54: case 55:
PushSub(ILPC+1); /* push return location there */
if (ILPC == 0) break;
ILPC = (Peek2(ILPC-1)&0x7FF)+Peek2(ILfront);
if (DEBUGON>0) LogIt(-ILPC);
break;
/* J a 3800-3FFF Jump. */
/* The low eleven bits of this 2-byte */
/* instruction are added to the IL program base address to determine */
/* the address of the next IL instruction. The previous contents of */
/* the IL program counter is lost. */
case 56: case 57: case 58: case 59: case 60: case 61: case 62: case 63:
ILPC = (Peek2(ILPC-1)&0x7FF)+Peek2(ILfront);
if (DEBUGON>0) LogIt(-ILPC);
break;
/* NO 08 No Operation. */
/* This may be used as a space filler (such as to */
/* ignore a skip). */
default: break;} /* last of inner switch cases */
break; /* end of outer switch cases 0,1 */
/* BR a 40-7F Relative Branch. */
/* The low six bits of this instruction opcode are */
/* added algebraically to the current value of the IL program counter */
/* to give the address of the next IL instruction. Bit 5 of opcode is */
/* the sign, with + signified by 1, - by 0. The range of this branch */
/* is +/-31 bytes from address of the byte following the opcode. An */
/* offset of zero (i.e. opcode 60) results in an error stop. The */
/* branch operation is unconditional. */
case 2: case 3:
ILPC = ILPC+op-96;
if (DEBUGON>0) LogIt(-ILPC);
break;
/* BC a "xxx" 80xxxxXx-9FxxxxXx String Match Branch. */
/* The ASCII character string in IL */
/* following this opcode is compared to the string beginning with the */
/* current position of the BASIC pointer, ignoring blanks in BASIC */
/* program. The comparison continues until either a mismatch, or an */
/* IL byte is reached with the most significant bit set to one. This */
/* is the last byte of the string in the IL, compared as a 7-bit */
/* character; if equal, the BASIC pointer is positioned after the */
/* last matching character in the BASIC program and the IL continues */
/* with the next instruction in sequence. Otherwise the BASIC pointer */
/* is not altered and the low five bits of the Branch opcode are */
/* added to the IL program counter to form the address of the next */
/* IL instruction. If the strings do not match and the branch offset */
/* is zero an error stop occurs. */
case 4:
if (op==128) here = 0; /* to error if no match */
else here = ILPC+op-128;
chpt = BP;
ix = 0;
while ((ix&128)==0) {
while (((char)Core[BP]) == ' ') BP++; /* skip over spaces */
ix = (int)Core[ILPC++];
if (((char)(ix&127)) != DeCaps[((int)Core[BP++])&127]) {
BP = chpt; /* back up to front of string in Basic */
if (here==0) TBerror();
else ILPC = here; /* jump forward in IL */
break;}}
if (DEBUGON>0) if (ILPC>0) LogIt(-ILPC);
break;
/* BV a A0-BF Branch if Not Variable. */
/* If the next non-blank character pointed to by the */
/* BASIC pointer is a capital letter, its ASCII code is [doubled and] */
/* pushed onto the expression stack and the IL program advances to */
/* next instruction in sequence, leaving the BASIC pointer positioned */
/* after the letter; if not a letter the branch is taken and BASIC */
/* pointer is left pointing to that character. An error stop occurs */
/* if the next character is not a letter and the offset of the branch */
/* is zero, or on stack overflow. */
case 5:
while (((char)Core[BP]) == ' ') BP++; /* skip over spaces */
ch = (char)Core[BP];
if (ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z')
PushExBy((((int)Core[BP++])&0x5F)*2);
else if (op==160) TBerror(); /* error if not letter */
else ILPC = ILPC+op-160;
if (DEBUGON>0) if (ILPC>0) LogIt(-ILPC);
break;
/* BN a C0-DF Branch if Not a Number. */
/* If the next non-blank character pointed to by the */
/* BASIC pointer is not a decimal digit, the low five bits of the */
/* opcode are added to the IL program counter, or if zero an error */
/* stop occurs. If the next character is a digit, then it and all */
/* decimal digits following it (ignoring blanks) are converted to a */
/* 16-bit binary number which is pushed onto the expression stack. In */
/* either case the BASIC pointer is positioned at the next character */
/* which is neither blank nor digit. Stack overflow will result in an */
/* error stop. */
case 6:
while (((char)Core[BP]) == ' ') BP++; /* skip over spaces */
ch = (char)Core[BP];
if (ch >= '0' && ch <= '9') {
op = 0;
while (true) {
here = (int)Core[BP++];
if (here==32) continue; /* skip over spaces */
if (here<48 || here>57) break; /* not a decimal digit */
op = op*10+here-48;} /* insert into value */
BP--; /* back up over non-digit */
PushExInt(op);}
else if (op==192) TBerror(); /* error if no digit */
else ILPC = ILPC+op-192;
if (DEBUGON>0) if (ILPC>0) LogIt(-ILPC);
break;
/* BE a E0-FF Branch if Not Endline. */
/* If the next non-blank character pointed to by the */
/* BASIC pointer is a carriage return, the IL program advances to the */
/* next instruction in sequence; otherwise the low five bits of the */
/* opcode (if not 0) are added to the IL program counter to form the */
/* address of next IL instruction. In either case the BASIC pointer */
/* is left pointing to the first non-blank character; this */
/* instruction will not pass over the carriage return, which must */
/* remain for testing by the NX instruction. As with the other */
/* conditional branches, the branch may only advance the IL program */
/* counter from 1 to 31 bytes; an offset of zero results in an error */
/* stop. */
case 7:
while (((char)Core[BP]) == ' ') BP++; /* skip over spaces */
if (((char)Core[BP]) == '\r') ;
else if (op==224) TBerror(); /* error if no offset */
else ILPC = ILPC+op-224;
if (DEBUGON>0) if (ILPC>0) LogIt(-ILPC);
break;}}} /* ~Interp */
/***************** Intermediate Interpreter Assembled *****************/
char* DefaultIL() {
static char s[9000]; /* be sure to increase size if you add text */
strcpy(s
,"0000 ; 1 . ORIGINAL TINY BASIC INTERMEDIATE INTERPRETER\n"); strcat(s
,"0000 ; 3 . EXECUTIVE INITIALIZATION\n"); strcat(s
,"0000 ; 5 :STRT PC \":Q^\" COLON, X-ON\n"); strcat(s
,"0004 10; 8 BE L0 BRANCH IF NOT EMPTY\n"); strcat(s
,"0005 E1; 9 BR STRT TRY AGAIN IF NULL LINE\n"); strcat(s
,"0006 59; 10 :L0 BN STMT TEST FOR LINE NUMBER\n"); strcat(s
,"0007 C5; 11 IL IF SO, INSERT INTO PROGRAM\n"); strcat(s
,"0008 2A; 12 BR STRT GO GET NEXT\n"); strcat(s
,"0009 56; 13 :XEC SB SAVE POINTERS FOR RUN WITH\n"); strcat(s
,"000A 10; 14 RB CONCATENATED INPUT\n"); strcat(s
,"000D ; 17 . STATEMENT EXECUTOR\n"); strcat(s
,"000D ; 19 :STMT BC GOTO \"LET\"\n"); strcat(s
,"0011 ; 20 BV * MUST BE A VARIABLE NAME\n"); strcat(s
,"0011 A0; 21 BC * \"=\"\n"); strcat(s
,"0012 80BD; 22 :LET JS EXPR GO GET EXPRESSION\n"); strcat(s
,"0014 30BC; 23 BE * IF STATEMENT END,\n"); strcat(s
,"0016 E0; 24 SV STORE RESULT\n"); strcat(s
,"0019 ; 27 :GOTO BC PRNT \"GO\"\n"); strcat(s
,"001C ; 28 BC GOSB \"TO\"\n"); strcat(s
,"001F ; 29 JS EXPR GET LINE NUMBER\n"); strcat(s
,"001F 30BC; 30 BE *\n"); strcat(s
,"0021 E0; 31 SB (DO THIS FOR STARTING)\n"); strcat(s
,"0023 11; 33 GO GO THERE\n"); strcat(s
,"0025 ; 35 :GOSB BC * \"SUB\" NO OTHER WORD BEGINS \"GO...\"\n"); strcat(s
,"0029 ; 36 JS EXPR\n"); strcat(s
,"0029 30BC; 37 BE *\n"); strcat(s
,"002E ; 41 :PRNT BC SKIP \"PR\"\n"); strcat(s
,"0031 ; 42 BC P0 \"INT\" OPTIONALLY OMIT \"INT\"\n"); strcat(s
,"0035 ; 43 :P0 BE P3\n"); strcat(s
,"0035 E5; 44 BR P6 IF DONE, GO TO END\n"); strcat(s
,"0036 71; 45 :P1 BC P4 \";\"\n"); strcat(s
,"0037 88BB; 46 :P2 BE P3\n"); strcat(s
,"0039 E1; 47 NX NO CRLF IF ENDED BY ; OR ,\n"); strcat(s
,"003A 1D; 48 :P3 BC P7 '\"'\n"); strcat(s
,"003B 8FA2; 49 PQ QUOTE MARKS STRING\n"); strcat(s
,"003D 21; 50 BR P1 GO CHECK DELIMITER\n"); strcat(s
,"003E 58; 51 :SKIP BR IF (ON THE WAY THRU)\n"); strcat(s
,"003F 6F; 52 :P4 BC P5 \",\"\n"); strcat(s
,"0040 83AC; 53 PT COMMA SPACING\n"); strcat(s
,"0042 22; 54 BR P2\n"); strcat(s
,"0043 55; 55 :P5 BC P6 \":\"\n"); strcat(s
,"0044 83BA; 56 PC \"S^\" OUTPUT X-OFF\n"); strcat(s
,"0046 2493; 57 :P6 BE *\n"); strcat(s
,"0048 E0; 58 NL THEN CRLF\n"); strcat(s
,"004A 1D; 60 :P7 JS EXPR TRY FOR AN EXPRESSION\n"); strcat(s
,"004B 30BC; 61 PN\n"); strcat(s
,"004D 20; 62 BR P1\n"); strcat(s
,"004F ; 64 :IF BC INPT \"IF\"\n"); strcat(s
,"0052 ; 65 JS EXPR\n"); strcat(s
,"0052 30BC; 66 JS RELO\n"); strcat(s
,"0054 3134; 67 JS EXPR\n"); strcat(s
,"0056 30BC; 68 BC I1 \"THEN\" OPTIONAL NOISEWORD\n"); strcat(s
,"0058 84544845CE;\n"); strcat(s
,"005D ; 69 :I1 CP COMPARE SKIPS NEXT IF TRUE\n"); strcat(s
,"005D 1C; 70 NX FALSE.\n"); strcat(s
,"005E 1D; 71 J STMT TRUE. GO PROCESS STATEMENT\n"); strcat(s
,"005F 380D; 72 .\n"); strcat(s
,"0061 ; 73 :INPT BC RETN \"INPUT\"\n"); strcat(s
,"0061 9A494E5055D4;\n"); strcat(s
,"0067 ; 74 :I2 BV * GET VARIABLE\n"); strcat(s
,"0067 A0; 75 SB SWAP POINTERS\n"); strcat(s
,"0068 10; 76 BE I4\n"); strcat(s
,"0069 E7; 77 :I3 PC \"? Q^\" LINE IS EMPTY; TYPE PROMPT\n"); strcat(s
,"006E ; 78 GL READ INPUT LINE\n"); strcat(s
,"006E 27; 79 BE I4 DID ANYTHING COME?\n"); strcat(s
,"006F E1; 80 BR I3 NO, TRY AGAIN\n"); strcat(s
,"0070 59; 81 :I4 BC I5 \",\" OPTIONAL COMMA\n"); strcat(s
,"0071 81AC; 82 :I5 JS EXPR READ A NUMBER\n"); strcat(s
,"0073 30BC; 83 SV STORE INTO VARIABLE\n"); strcat(s
,"0075 13; 84 RB SWAP BACK\n"); strcat(s
,"0076 11; 85 BC I6 \",\" ANOTHER?\n"); strcat(s
,"0077 82AC; 86 BR I2 YES IF COMMA\n"); strcat(s
,"0079 4D; 87 :I6 BE * OTHERWISE QUIT\n"); strcat(s
,"007C ; 90 :RETN BC END \"RETURN\"\n"); strcat(s
,"007C 895245545552CE;\n"); strcat(s
,"0083 E0; 92 RS RECOVER SAVED LINE\n"); strcat(s
,"0086 ; 95 :END BC LIST \"END\"\n"); strcat(s
,"008C ; 99 :LIST BC RUN \"LIST\"\n"); strcat(s
,"008C 984C4953D4;\n"); strcat(s
,"0091 ; 100 BE L2\n"); strcat(s
,"0091 EC; 101 :L1 PC \"@^@^@^@^J^@^\" PUNCH LEADER\n"); strcat(s
,"0092 24000000000A80;\n"); strcat(s
,"0099 ; 102 LS LIST\n"); strcat(s
,"0099 1F; 103 PC \"S^\" PUNCH X-OFF\n"); strcat(s
,"009A 2493; 104 NL\n"); strcat(s
,"009C 23; 105 NX\n"); strcat(s
,"009D 1D; 106 :L2 JS EXPR GET A LINE NUMBER\n"); strcat(s
,"009E 30BC; 107 BE L3\n"); strcat(s
,"00A0 E1; 108 BR L1\n"); strcat(s
,"00A1 50; 109 :L3 BC * \",\" SEPARATED BY COMMAS\n"); strcat(s
,"00A2 80AC; 110 BR L2\n"); strcat(s
,"00A5 ; 112 :RUN BC CLER \"RUN\"\n"); strcat(s
,"00A9 ; 113 J XEC\n"); strcat(s
,"00A9 380A; 114 .\n"); strcat(s
,"00AB ; 115 :CLER BC REM \"CLEAR\"\n"); strcat(s
,"00AB 86434C4541D2;\n"); strcat(s
,"00B2 ; 118 :REM BC DFLT \"REM\"\n"); strcat(s
,"00B7 ; 121 :DFLT BV * NO KEYWORD...\n"); strcat(s
,"00B7 A0; 122 BC * \"=\" TRY FOR LET\n"); strcat(s
,"00B8 80BD; 123 J LET IT'S A GOOD BET.\n"); strcat(s
,"00BA 3814; 124 .\n"); strcat(s
,"00BC ; 125 . SUBROUTINES\n"); strcat(s
,"00BC ; 127 :EXPR BC E0 \"-\" TRY FOR UNARY MINUS\n"); strcat(s
,"00BC 85AD; 128 JS TERM AHA\n"); strcat(s
,"00BE 30D3; 129 NE\n"); strcat(s
,"00C0 17; 130 BR E1\n"); strcat(s
,"00C1 64; 131 :E0 BC E4 \"+\" IGNORE UNARY PLUS\n"); strcat(s
,"00C2 81AB; 132 :E4 JS TERM\n"); strcat(s
,"00C4 30D3; 133 :E1 BC E2 \"+\" TERMS SEPARATED BY PLUS\n"); strcat(s
,"00C6 85AB; 134 JS TERM\n"); strcat(s
,"00C8 30D3; 135 AD\n"); strcat(s
,"00CA 18; 136 BR E1\n"); strcat(s
,"00CB 5A; 137 :E2 BC E3 \"-\" TERMS SEPARATED BY MINUS\n"); strcat(s
,"00CC 85AD; 138 JS TERM\n"); strcat(s
,"00CE 30D3; 139 SU\n"); strcat(s
,"00D0 19; 140 BR E1\n"); strcat(s
,"00D1 54; 141 :E3 RT\n"); strcat(s
,"00D3 ; 143 :TERM JS FACT\n"); strcat(s
,"00D3 30E2; 144 :T0 BC T1 \"*\" FACTORS SEPARATED BY TIMES\n"); strcat(s
,"00D5 85AA; 145 JS FACT\n"); strcat(s
,"00D7 30E2; 146 MP\n"); strcat(s
,"00D9 1A; 147 BR T0\n"); strcat(s
,"00DA 5A; 148 :T1 BC T2 \"/\" FACTORS SEPARATED BY DIVIDE\n"); strcat(s
,"00DB 85AF; 149 JS FACT\n"); strcat(s
,"00DD 30E2; 150 DV\n"); strcat(s
,"00DF 1B; 151 BR T0\n"); strcat(s
,"00E0 54; 152 :T2 RT\n"); strcat(s
,"00E2 ; 154 :FACT BC F0 \"RND\" *RND FUNCTION*\n"); strcat(s
,"00E6 ; 155 LN 257*128 STACK POINTER FOR STORE\n"); strcat(s
,"00E7 8080; 156 FV THEN GET RNDM\n"); strcat(s
,"00E9 12; 157 LN 2345 R:=R*2345+6789\n"); strcat(s
,"00EB 0929; 158 MP\n"); strcat(s
,"00ED 1A; 159 LN 6789\n"); strcat(s
,"00EF 1A85; 160 AD\n"); strcat(s
,"00F1 18; 161 SV\n"); strcat(s
,"00F2 13; 162 LB 128 GET IT AGAIN\n"); strcat(s
,"00F3 0980; 163 FV\n"); strcat(s
,"00F5 12; 164 DS\n"); strcat(s
,"00F6 0B; 165 JS FUNC GET ARGUMENT\n"); strcat(s
,"00F7 3130; 166 BR F1\n"); strcat(s
,"00F9 61; 167 :F0 BR F2 (SKIPPING)\n"); strcat(s
,"00FA 73; 168 :F1 DS\n"); strcat(s
,"00FB 0B; 169 SX 2 PUSH TOP INTO STACK\n"); strcat(s
,"00FC 02; 170 SX 4\n"); strcat(s
,"00FD 04; 171 SX 2\n"); strcat(s
,"00FE 02; 172 SX 3\n"); strcat(s
,"00FF 03; 173 SX 5\n"); strcat(s
,"0100 05; 174 SX 3\n"); strcat(s
,"0101 03; 175 DV PERFORM MOD FUNCTION\n"); strcat(s
,"0102 1B; 176 MP\n"); strcat(s
,"0103 1A; 177 SU\n"); strcat(s
,"0104 19; 178 DS PERFORM ABS FUNCTION\n"); strcat(s
,"0105 0B; 179 LB 6\n"); strcat(s
,"0106 0906; 180 LN 0\n"); strcat(s
,"0109 0000; 181 CP (SKIP IF + OR 0)\n"); strcat(s
,"010B 1C; 182 NE\n"); strcat(s
,"010C 17; 183 RT\n"); strcat(s
,"010D 2F; 184 :F2 BC F3 \"USR\" *USR FUNCTION*\n"); strcat(s
,"0112 ; 185 BC * \"(\" 3 ARGUMENTS POSSIBLE\n"); strcat(s
,"0112 80A8; 186 JS EXPR ONE REQUIRED\n"); strcat(s
,"0114 30BC; 187 JS ARG\n"); strcat(s
,"0116 312A; 188 JS ARG\n"); strcat(s
,"0118 312A; 189 BC * \")\"\n"); strcat(s
,"011A 80A9; 190 US GO DO IT\n"); strcat(s
,"011C 2E; 191 RT\n"); strcat(s
,"011D 2F; 192 :F3 BV F4 VARIABLE?\n"); strcat(s
,"011E A2; 193 FV YES. GET IT\n"); strcat(s
,"011F 12; 194 RT\n"); strcat(s
,"0120 2F; 195 :F4 BN F5 NUMBER?\n"); strcat(s
,"0121 C1; 196 RT GOT IT.\n"); strcat(s
,"0122 2F; 197 :F5 BC * \"(\" OTHERWISE MUST BE (EXPR)\n"); strcat(s
,"0123 80A8; 198 :F6 JS EXPR\n"); strcat(s
,"0125 30BC; 199 BC * \")\"\n"); strcat(s
,"0127 80A9; 200 RT\n"); strcat(s
,"012A ; 202 :ARG BC A0 \",\" COMMA?\n"); strcat(s
,"012A 83AC; 203 J EXPR YES, GET EXPRESSION\n"); strcat(s
,"012C 38BC; 204 :A0 DS NO, DUPLICATE STACK TOP\n"); strcat(s
,"012E 0B; 205 RT\n"); strcat(s
,"0130 ; 207 :FUNC BC * \"(\"\n"); strcat(s
,"0130 80A8; 208 BR F6\n"); strcat(s
,"0132 52; 209 RT\n"); strcat(s
,"0134 ; 211 :RELO BC R0 \"=\" CONVERT RELATION OPERATORS\n"); strcat(s
,"0134 84BD; 212 LB 2 TO CODE BYTE ON STACK\n"); strcat(s
,"0136 0902; 213 RT =\n"); strcat(s
,"0138 2F; 214 :R0 BC R4 \"<\"\n"); strcat(s
,"0139 8EBC; 215 BC R1 \"=\"\n"); strcat(s
,"013B 84BD; 216 LB 3 <=\n"); strcat(s
,"013D 0903; 217 RT\n"); strcat(s
,"013F 2F; 218 :R1 BC R3 \">\"\n"); strcat(s
,"0140 84BE; 219 LB 5 <>\n"); strcat(s
,"0142 0905; 220 RT\n"); strcat(s
,"0144 2F; 221 :R3 LB 1 <\n"); strcat(s
,"0145 0901; 222 RT\n"); strcat(s
,"0147 2F; 223 :R4 BC * \">\"\n"); strcat(s
,"0148 80BE; 224 BC R5 \"=\"\n"); strcat(s
,"014A 84BD; 225 LB 6 >=\n"); strcat(s
,"014C 0906; 226 RT\n"); strcat(s
,"014E 2F; 227 :R5 BC R6 \"<\"\n"); strcat(s
,"014F 84BC; 228 LB 5 ><\n"); strcat(s
,"0151 0905; 229 RT\n"); strcat(s
,"0153 2F; 230 :R6 LB 4 >\n"); strcat(s
,"0154 0904; 231 RT\n"); return s;} /* ~DefaultIL */
/**************************** Startup Code ****************************/
void StartTinyBasic(char* ILtext) {
int nx;
for (nx=0; nx<CoreTop; nx++) Core[nx] = 0; /* clear Core.. */
Poke2(ExpnStk,8191); /* random number seed */
Core[BScode] = 8; /* backspace */
Core[CanCode] = 27; /*escape */
for (nx=0; nx<32; nx++) DeCaps[nx] = '\0'; /* fill caps table.. */
for (nx=32; nx<127; nx++) DeCaps[nx] = (char)nx;
for (nx=65; nx<91; nx++) DeCaps[nx+32] = (char)nx;
DeCaps[9] = ' ';
DeCaps[10] = '\r';
DeCaps[13] = '\r';
DeCaps[127] = '\0';
if (ILtext == NULL) ILtext = DefaultIL(); /* no IL given, use mine */
ConvtIL(ILtext); /* convert IL assembly code to binary */
ColdStart();
Interp(); /* go do it */
if (oFile != NULL) IoFileClose(oFile); /* close output file */
if (inFile != NULL) IoFileClose(inFile); /* close input file */
oFile = NULL;
inFile = NULL;} /* ~StartTinyBasic */
int main(int argc, char* argv[]) {
/* CONSOLE_INIT("TinyBasic"); */
if (con_init_console_dll()) return 1; // init fail
con_set_title("TinyBasic");
int nx;
long int len;
char* IL = NULL;
FileType tmpFile;
inFile = NULL;
oFile = NULL;
for (nx=1; nx<argc; nx++) { /* look for command-line args.. */
if (strcmp(argv
[nx
],"-b")==0 && ++nx
<argc
) { /* alt IL file.. */ tmpFile
= fopen(argv
[nx
],"r"); if (tmpFile
!= NULL
) if (fseek(tmpFile
,0,SEEK_END
)==0) { len
= ftell(tmpFile
); /* get file size.. */ if (fseek(tmpFile
,0,SEEK_SET
)==0) if (len
>9) { len = len/8+len; /* allow for line end expansion */
if (IL
!= NULL
) len
= fread(IL
,1,len
,tmpFile
); IL[len] = '\0';
IoFileClose(tmpFile);}}
else con_printf("Could not open file %s", argv[nx]);}
else if (strcmp(argv
[nx
],"-o")==0 && ++nx
<argc
) /* output file */ oFile
= fopen(argv
[nx
],"w"); else if (strcmp(argv
[nx
],"-i")==0 && ++nx
<argc
) /* input file */ inFile
= fopen(argv
[nx
],"r"); else if (inFile==NULL) /* default (unadorned) is also input file */
inFile
= fopen(argv
[nx
],"r");} /* ignore other args */
#ifdef DefaultInputFile
if (inFile
==NULL
) inFile
= fopen(DefaultInputFile
,"r"); #endif
#ifdef DefaultOutputFile
if (oFile
==NULL
) oFile
= fopen(DefaultOutputFile
,"w"); #endif
StartTinyBasic(IL); /* go do it */
return 0;} /* ~main */
char *ExplainErr(int code)
{
switch (code)
{
case 0: return "Break during execution";
case 8: return "Memory overflow; line not inserted";
case 9: return "Line number 0 not allowed";
case 13: return "RUN with no program in memory";
case 18: return "LET is missing a variable name";
case 20: return "LET is missing an =";
case 23: return "Improper syntax in LET";
case 25: return "LET is not followed by END";
case 34: return "Improper syntax in GOTO";
case 37: return "No line to GO TO";
case 39: return "Misspelled GOTO";
case 40:
case 41: return "Misspelled GOSUB";
case 46: return "GOSUB subroutine does not exist";
case 59: return "PRINT not followed by END";
case 62: return "Missing close quote in PRINT string";
case 73: return "Colon in PRINT is not at end of statement";
case 75: return "PRINT not followed by END";
case 95: return "IF not followed by END";
case 104: return "INPUT syntax bad - expects variable name";
case 123: return "INPUT syntax bad - expects comma";
case 124: return "INPUT not followed by END";
case 132: return "RETURN syntax bad";
case 133: return "RETURN has no matching GOSUB";
case 134: return "GOSUB not followed by END";
case 139: return "END syntax bad";
case 154: return "Can't LIST line number 0";
case 164: return "LIST syntax error - expects comma";
case 183: return "REM not followed by END";
case 184: return "Missing statement type keyword";
case 186: return "Misspelled statement type keyword";
case 188: return "Memory overflow: too many GOSUB's ...";
case 211: return "Memory overflow: ... or expression too complex";
case 224: return "Divide by 0";
case 226: return "Memory overflow";
case 232: return "Expression too complex ...";
case 233: return "Expression too complex ... using RND ...";
case 234: return "Expression too complex ... in direct evaluation";
case 253: return "Expression too complex ... simplify the expression";
case 259: return "RND (0) not allowed";
case 266: return "Expression too complex ...";
case 267: return "Expression too complex ... for RND";
case 275: return "USR expects \"(\" before arguments";
case 284: return "USR expects \")\" after arguments";
case 287: return "Expression too complex ...";
case 288: return "Expression too complex ... for USR";
case 290: return "Expression too complex";
case 293: return "Syntax error in expression - expects value";
case 296: return "Syntax error - expects \")\"";
case 298: return "Memory overflow (in USR)";
case 303: return "Expression too complex (in USR)";
case 304: return "Memory overflow (in function evaluation)";
case 306: return "Syntax error - expects \"(\" for function arguments";
case 330: return "IF syntax error - expects relation operator";
default: return "Unknown error, interpreter is malfunctioning";
}
}