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bas2tap.c
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/**********************************************************************************************************************************/
/* Module : BAS2TAP.C */
/* Executable : BAS2TAP.EXE */
/* Doc file : BAS2TAP.DOC */
/* Version type : Single file */
/* OS type : Generic */
/* Watcom C = wcl386 -mf -fp3 -fpi -3r -oxnt -w4 -we bas2tap.c */
/* MS C = cl /Ox /G2 /AS bas2tap.c /F 1000 */
/* gcc = gcc -Wall -O2 bas2tap.c -o bas2tap -lm ; strip bas2tap */
/* SAS/C = sc link math=ieee bas2tap.c */
/* Libs needed : math */
/* Description : Convert ASCII BASIC file to TAP tape image emulator file */
/* */
/* Notes : There's a check for a define "__DEBUG__", which generates tons of output if defined. */
/* */
/* Copyleft (C) 1998-2013 ThunderWare Research Center, written by Martijn van der Heide. */
/* (And also Daniel Bailey, 2017, added a missing feature) */
/* */
/* This program 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. */
/* */
/* This program 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 General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
/**********************************************************************************************************************************/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
/**********************************************************************************************************************************/
/* Some compilers don't define the following things, so I define them here... */
/**********************************************************************************************************************************/
#ifdef __WATCOMC__
#define x_strnicmp(_S1,_S2,_Len) strnicmp (_S1, _S2, _Len)
#define x_log2(_X) log2 (_X)
#else
int x_strnicmp (char *_S1, char *_S2, int _Len) /* Case independant partial string compare */
{
for ( ; _Len && *_S1 && *_S2 && toupper (*_S1) == toupper (*_S2) ; _S1 ++, _S2 ++, _Len --)
;
return (_Len ? (int)toupper (*_S1) - (int)toupper (*_S2) : 0);
}
#define x_log2(_X) (log (_X) / log (2.0)) /* If your compiler doesn't know the 'log2' function */
#endif
//#define __DEBUG__
typedef unsigned char byte;
#ifndef FALSE
typedef unsigned char bool; /* If your compiler doesn't know this variable type yet */
#define TRUE 1
#define FALSE 0
#endif
/**********************************************************************************************************************************/
/* Define the global variables */
/**********************************************************************************************************************************/
struct TokenMap_s
{
char *Token;
byte TokenType;
/* Type 0 = No special meaning */
/* Type 1 = Always keyword */
/* Type 2 = Can be both keyword and non-keyword (colour parameters) */
/* Type 3 = Numeric expression token */
/* Type 4 = String expression token */
/* Type 5 = May only appear in (L)PRINT statements (AT and TAB) */
/* Type 6 = Type-less (normal ASCII or expression token) */
byte KeywordClass[8]; /* The class this keyword belongs to, as defined in the Spectrum ROM */
/* This table is used by expression tokens as well. Class 12 was added for this purpose */
/* Class 0 = No further operands */
/* Class 1 = Used in LET. A variable is required */
/* Class 2 = Used in LET. An expression, numeric or string, must follow */
/* Class 3 = A numeric expression may follow. Zero to be used in case of default */
/* Class 4 = A single character variable must follow */
/* Class 5 = A set of items may be given */
/* Class 6 = A numeric expression must follow */
/* Class 7 = Handles colour items */
/* Class 8 = Two numeric expressions, separated by a comma, must follow */
/* Class 9 = As for class 8 but colour items may precede the expression */
/* Class 10 = A string expression must follow */
/* Class 11 = Handles cassette routines */
/* The following classes are not available in the ROM but were needed */
/* Class 12 = One or more string expressions, separated by commas, must follow */
/* Class 13 = One or more expressions, separated by commas, must follow */
/* Class 14 = One or more variables, separated by commas, must follow (READ) */
/* Class 15 = DEF FN */
} TokenMap[256] = {
/* Everything below ASCII 32 */
{NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }},
{NULL, 6, { 0 }}, /* Print ' */
{NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }},
{"(eoln)", 6, { 0 }}, /* CR */
{NULL, 6, { 0 }}, /* Number */
{NULL, 6, { 0 }},
{NULL, 6, { 0 }}, /* INK */
{NULL, 6, { 0 }}, /* PAPER */
{NULL, 6, { 0 }}, /* FLASH */
{NULL, 6, { 0 }}, /* BRIGHT */
{NULL, 6, { 0 }}, /* INVERSE */
{NULL, 6, { 0 }}, /* OVER */
{NULL, 6, { 0 }}, /* AT */
{NULL, 6, { 0 }}, /* TAB */
{NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }}, {NULL, 6, { 0 }},
{NULL, 6, { 0 }},
/* Normal ASCII set */
{"\x20", 6, { 0 }}, {"\x21", 6, { 0 }}, {"\x22", 6, { 0 }}, {"\x23", 6, { 0 }}, {"\x24", 6, { 0 }}, {"\x25", 6, { 0 }},
{"\x26", 6, { 0 }}, {"\x27", 6, { 0 }}, {"\x28", 6, { 0 }}, {"\x29", 6, { 0 }}, {"\x2A", 6, { 0 }}, {"\x2B", 6, { 0 }},
{"\x2C", 6, { 0 }}, {"\x2D", 6, { 0 }}, {"\x2E", 6, { 0 }}, {"\x2F", 6, { 0 }}, {"\x30", 6, { 0 }}, {"\x31", 6, { 0 }},
{"\x32", 6, { 0 }}, {"\x33", 6, { 0 }}, {"\x34", 6, { 0 }}, {"\x35", 6, { 0 }}, {"\x36", 6, { 0 }}, {"\x37", 6, { 0 }},
{"\x38", 6, { 0 }}, {"\x39", 6, { 0 }}, {"\x3A", 2, { 0 }}, {"\x3B", 6, { 0 }}, {"\x3C", 6, { 0 }}, {"\x3D", 6, { 0 }},
{"\x3E", 6, { 0 }}, {"\x3F", 6, { 0 }}, {"\x40", 6, { 0 }}, {"\x41", 6, { 0 }}, {"\x42", 6, { 0 }}, {"\x43", 6, { 0 }},
{"\x44", 6, { 0 }}, {"\x45", 6, { 0 }}, {"\x46", 6, { 0 }}, {"\x47", 6, { 0 }}, {"\x48", 6, { 0 }}, {"\x49", 6, { 0 }},
{"\x4A", 6, { 0 }}, {"\x4B", 6, { 0 }}, {"\x4C", 6, { 0 }}, {"\x4D", 6, { 0 }}, {"\x4E", 6, { 0 }}, {"\x4F", 6, { 0 }},
{"\x50", 6, { 0 }}, {"\x51", 6, { 0 }}, {"\x52", 6, { 0 }}, {"\x53", 6, { 0 }}, {"\x54", 6, { 0 }}, {"\x55", 6, { 0 }},
{"\x56", 6, { 0 }}, {"\x57", 6, { 0 }}, {"\x58", 6, { 0 }}, {"\x59", 6, { 0 }}, {"\x5A", 6, { 0 }}, {"\x5B", 6, { 0 }},
{"\x5C", 6, { 0 }}, {"\x5D", 6, { 0 }}, {"\x5E", 6, { 0 }}, {"\x5F", 6, { 0 }}, {"\x60", 6, { 0 }}, {"\x61", 6, { 0 }},
{"\x62", 6, { 0 }}, {"\x63", 6, { 0 }}, {"\x64", 6, { 0 }}, {"\x65", 6, { 0 }}, {"\x66", 6, { 0 }}, {"\x67", 6, { 0 }},
{"\x68", 6, { 0 }}, {"\x69", 6, { 0 }}, {"\x6A", 6, { 0 }}, {"\x6B", 6, { 0 }}, {"\x6C", 6, { 0 }}, {"\x6D", 6, { 0 }},
{"\x6E", 6, { 0 }}, {"\x6F", 6, { 0 }}, {"\x70", 6, { 0 }}, {"\x71", 6, { 0 }}, {"\x72", 6, { 0 }}, {"\x73", 6, { 0 }},
{"\x74", 6, { 0 }}, {"\x75", 6, { 0 }}, {"\x76", 6, { 0 }}, {"\x77", 6, { 0 }}, {"\x78", 6, { 0 }}, {"\x79", 6, { 0 }},
{"\x7A", 6, { 0 }}, {"\x7B", 6, { 0 }}, {"\x7C", 6, { 0 }}, {"\x7D", 6, { 0 }}, {"\x7E", 6, { 0 }}, {"\x7F", 6, { 0 }},
/* Block graphics without shift */
{"\x80", 6, { 0 }}, {"\x81", 6, { 0 }}, {"\x82", 6, { 0 }}, {"\x83", 6, { 0 }}, {"\x84", 6, { 0 }}, {"\x85", 6, { 0 }},
{"\x86", 6, { 0 }}, {"\x87", 6, { 0 }},
/* Block graphics with shift */
{"\x88", 6, { 0 }}, {"\x89", 6, { 0 }}, {"\x8A", 6, { 0 }}, {"\x8B", 6, { 0 }}, {"\x8C", 6, { 0 }}, {"\x8D", 6, { 0 }},
{"\x8E", 6, { 0 }}, {"\x8F", 6, { 0 }},
/* UDGs */
{"\x90", 6, { 0 }}, {"\x91", 6, { 0 }}, {"\x92", 6, { 0 }}, {"\x93", 6, { 0 }}, {"\x94", 6, { 0 }}, {"\x95", 6, { 0 }},
{"\x96", 6, { 0 }}, {"\x97", 6, { 0 }}, {"\x98", 6, { 0 }}, {"\x99", 6, { 0 }}, {"\x9A", 6, { 0 }}, {"\x9B", 6, { 0 }},
{"\x9C", 6, { 0 }}, {"\x9D", 6, { 0 }}, {"\x9E", 6, { 0 }}, {"\x9F", 6, { 0 }}, {"\xA0", 6, { 0 }}, {"\xA1", 6, { 0 }},
{"\xA2", 6, { 0 }},
{"SPECTRUM", 1, { 0 }}, /* For Spectrum 128 */
{"PLAY", 1, { 12 }},
/* BASIC tokens - expression */
{"RND", 3, { 0 }},
{"INKEY$", 4, { 0 }},
{"PI", 3, { 0 }},
{"FN", 3, { 1, '(', 13, ')', 0 }},
{"POINT", 3, { '(', 8, ')', 0 }},
{"SCREEN$", 4, { '(', 8, ')', 0 }},
{"ATTR", 3, { '(', 8, ')', 0 }},
{"AT", 5, { 8, 0 }},
{"TAB", 5, { 6, 0 }},
{"VAL$", 4, { 10, 0 }},
{"CODE", 3, { 10, 0 }},
{"VAL", 3, { 10, 0 }},
{"LEN", 3, { 10, 0 }},
{"SIN", 3, { 6, 0 }},
{"COS", 3, { 6, 0 }},
{"TAN", 3, { 6, 0 }},
{"ASN", 3, { 6, 0 }},
{"ACS", 3, { 6, 0 }},
{"ATN", 3, { 6, 0 }},
{"LN", 3, { 6, 0 }},
{"EXP", 3, { 6, 0 }},
{"INT", 3, { 6, 0 }},
{"SQR", 3, { 6, 0 }},
{"SGN", 3, { 6, 0 }},
{"ABS", 3, { 6, 0 }},
{"PEEK", 3, { 6, 0 }},
{"IN", 3, { 6, 0 }},
{"USR", 3, { 6, 0 }},
{"STR$", 4, { 6, 0 }},
{"CHR$", 4, { 6, 0 }},
{"NOT", 3, { 6, 0 }},
{"BIN", 6, { 0 }},
{"OR", 6, { 5, 0 }}, /* -\ */
{"AND", 6, { 5, 0 }}, /* | */
{"<=", 6, { 5, 0 }}, /* | These are handled directly within ScanExpression */
{">=", 6, { 5, 0 }}, /* | */
{"<>", 6, { 5, 0 }}, /* -/ */
{"LINE", 6, { 0 }},
{"THEN", 6, { 0 }},
{"TO", 6, { 0 }},
{"STEP", 6, { 0 }},
/* BASIC tokens - keywords */
{"DEF FN", 1, { 15, 0 }}, /* Special treatment - insertion of call-by-value room required for the evaluator */
{"CAT", 1, { 11, 0 }},
{"FORMAT", 1, { 11, 0 }},
{"MOVE", 1, { 11, 0 }},
{"ERASE", 1, { 11, 0 }},
{"OPEN #", 1, { 11, 0 }},
{"CLOSE #", 1, { 11, 0 }},
{"MERGE", 1, { 11, 0 }},
{"VERIFY", 1, { 11, 0 }},
{"BEEP", 1, { 8, 0 }},
{"CIRCLE", 1, { 9, ',', 6, 0 }},
{"INK", 2, { 7, 0 }},
{"PAPER", 2, { 7, 0 }},
{"FLASH", 2, { 7, 0 }},
{"BRIGHT", 2, { 7, 0 }},
{"INVERSE", 2, { 7, 0 }},
{"OVER", 2, { 7, 0 }},
{"OUT", 1, { 8, 0 }},
{"LPRINT", 1, { 5, 0 }},
{"LLIST", 1, { 3, 0 }},
{"STOP", 1, { 0 }},
{"READ", 1, { 14, 0 }},
{"DATA", 2, { 13, 0 }},
{"RESTORE", 1, { 3, 0 }},
{"NEW", 1, { 0 }},
{"BORDER", 1, { 6, 0 }},
{"CONTINUE", 1, { 0 }},
{"DIM", 1, { 1, '(', 13, ')', 0 }},
{"REM", 1, { 5, 0 }}, /* (Special: taken out separately) */
{"FOR", 1, { 4, '=', 6, 0xCC, 6, 0xCD, 6, 0 }}, /* (Special: STEP (0xCD) is not required) */
{"GO TO", 1, { 6, 0 }},
{"GO SUB", 1, { 6, 0 }},
{"INPUT", 1, { 5, 0 }},
{"LOAD", 1, { 11, 0 }},
{"LIST", 1, { 3, 0 }},
{"LET", 1, { 1, '=', 2, 0 }},
{"PAUSE", 1, { 6, 0 }},
{"NEXT", 1, { 4, 0 }},
{"POKE", 1, { 8, 0 }},
{"PRINT", 1, { 5, 0 }},
{"PLOT", 1, { 9, 0 }},
{"RUN", 1, { 3, 0 }},
{"SAVE", 1, { 11, 0 }},
{"RANDOMIZE", 1, { 3, 0 }},
{"IF", 1, { 6, 0xCB, 0 }},
{"CLS", 1, { 0 }},
{"DRAW", 1, { 9, ',', 6, 0 }},
{"CLEAR", 1, { 3, 0 }},
{"RETURN", 1, { 0 }},
{"COPY", 1, { 0 }}};
#define MAXLINELENGTH 1024
char ConvertedSpectrumLine[MAXLINELENGTH + 1];
byte ResultingLine[MAXLINELENGTH + 1];
struct TapeHeader_s
{
byte LenLo1;
byte LenHi1;
byte Flag1;
byte HType;
char HName[10];
byte HLenLo;
byte HLenHi;
byte HStartLo;
byte HStartHi;
byte HBasLenLo;
byte HBasLenHi;
byte Parity1;
byte LenLo2;
byte LenHi2;
byte Flag2;
} TapeHeader = {19, 0, /* Len header */
0, /* Flag header */
0, {32, 32, 32, 32, 32, 32, 32, 32, 32, 32}, 0, 0, 0, 128, 0, 0, /* The header itself */
0, /* Parity header */
0, 0, /* Len converted BASIC */
255}; /* Flag converted BASIC */
int Is48KProgram = -1; /* -1 = unknown */
/* 1 = 48K */
/* 0 = 128K */
int UsesInterface1 = -1; /* -1 = unknown */
/* 0 = either Interface1 or Opus Discovery */
/* 1 = Interface1 */
/* 2 = Opus Discovery */
bool CaseIndependant = FALSE;
bool Quiet = FALSE; /* Suppress banner and progress indication if TRUE */
bool NoWarnings = FALSE; /* Suppress warnings if TRUE */
bool DoCheckSyntax = TRUE;
bool TokenBracket = FALSE;
bool HandlingDEFFN = FALSE; /* Exceptional instruction */
bool InsideDEFFN = FALSE;
bool TokenizeREM = FALSE;
#define DEFFN 0xCE
FILE *ErrStream;
/**********************************************************************************************************************************/
/* Let's be lazy and define a very commonly used error message.... */
/**********************************************************************************************************************************/
#define BADTOKEN(_Exp,_Got) fprintf (ErrStream, "ERROR in line %d, statement %d - Expected %s, but got \"%s\"\n", \
BasicLineNo, StatementNo, _Exp, _Got)
/**********************************************************************************************************************************/
/* And let's generate tons of debugging info too.... */
/**********************************************************************************************************************************/
#ifdef __DEBUG__
char ListSpaces[20];
int RecurseLevel;
#endif
/**********************************************************************************************************************************/
/* Prototype all functions */
/**********************************************************************************************************************************/
int GetLineNumber (char **FirstAfter);
int MatchToken (int BasicLineNo, bool WantKeyword, char **LineIndex, byte *Token);
int HandleNumbers (int BasicLineNo, char **BasicLine, byte **SpectrumLine);
int HandleBIN (int BasicLineNo, char **BasicLine, byte **SpectrumLine);
int ExpandSequences (int BasicLineNo, char **BasicLine, byte **SpectrumLine, bool StripSpaces);
int PrepareLine (char *LineIn, int FileLineNo, char **FirstToken);
bool ScanVariable (int BasicLineNo, int StatementNo, int Keyword, byte **Index, bool *Type, int *NameLen, int AllowSlicing);
bool SliceDirectString (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool ScanStream (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool ScanChannel (int BasicLineNo, int StatementNo, int Keyword, byte **Index, byte *WhichChannel);
bool SignalInterface1 (int BasicLineNo, int StatementNo, int NewMode);
bool CheckEnd (int BasicLineNo, int StatementNo, byte **Index);
bool ScanExpression (int BasicLineNo, int StatementNo, int Keyword, byte **Index, bool *Type, int Level);
bool HandleClass01 (int BasicLineNo, int StatementNo, int Keyword, byte **Index, bool *Type);
bool HandleClass02 (int BasicLineNo, int StatementNo, int Keyword, byte **Index, bool Type);
bool HandleClass03 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass04 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass05 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass06 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass07 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass08 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass09 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass10 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass11 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass12 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass13 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass14 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool HandleClass15 (int BasicLineNo, int StatementNo, int Keyword, byte **Index);
bool CheckSyntax (int BasicLineNo, byte *Line);
/**********************************************************************************************************************************/
/* Start of the program */
/**********************************************************************************************************************************/
int GetLineNumber (char **FirstAfter)
/**********************************************************************************************************************************/
/* Pre : The line must have been prepared into (global) `ConvertedSpectrumLine'. */
/* Post : The BASIC line number has been returned, or -1 if there was none. */
/* Import: None. */
/**********************************************************************************************************************************/
{
int LineNo = 0;
char *LineIndex;
bool SkipSpaces = TRUE;
bool Continue = TRUE;
LineIndex = ConvertedSpectrumLine;
while (*LineIndex && Continue)
if (*LineIndex == ' ') /* Skip leading spaces */
{
if (SkipSpaces)
LineIndex ++;
else
Continue = FALSE;
}
else if (isdigit (*LineIndex)) /* Process number */
{
LineNo = LineNo * 10 + *(LineIndex ++) - '0';
SkipSpaces = FALSE;
}
else
Continue = FALSE;
*FirstAfter = LineIndex;
if (SkipSpaces) /* Nothing found yet ? */
return (-1);
else
while ((**FirstAfter) == ' ') /* Skip trailing spaces */
(*FirstAfter) ++;
return (LineNo);
}
int MatchToken (int BasicLineNo, bool WantKeyword, char **LineIndex, byte *Token)
/**********************************************************************************************************************************/
/* Pre : `WantKeyword' is TRUE if we need in keyword match, `LineIndex' holds the position to match. */
/* Post : If there was a match, the token value is returned in `Token' and `LineIndex' is pointing after the string plus any */
/* any trailing space. */
/* The return value is 0 for no match, -2 for an error, -1 for a match of the wrong type, 1 for a good match. */
/* Import: None. */
/**********************************************************************************************************************************/
{
int Cnt;
size_t Length;
size_t LongestMatch = 0;
bool Match = FALSE;
bool Match2;
if ((**LineIndex) == ':') /* Special exception */
{
LongestMatch = 1;
Match = TRUE;
*Token = ':';
}
else for (Cnt = 0xA3 ; Cnt <= 0xFF ; Cnt ++) /* (Keywords start after the UDGs) */
{
Length = strlen (TokenMap[Cnt].Token);
if (CaseIndependant)
Match2 = !x_strnicmp (*LineIndex, TokenMap[Cnt].Token, Length);
else
Match2 = !strncmp (*LineIndex, TokenMap[Cnt].Token, Length);
if (Match2)
if (Length > LongestMatch)
{
LongestMatch = Length;
Match = TRUE;
*Token = Cnt;
}
}
if (!Match)
return (0); /* Signal: no match */
if (isalpha (*(*LineIndex + LongestMatch - 1)) && isalpha (*(*LineIndex + LongestMatch))) /* Continueing alpha string ? */
return (0); /* Then there's no match after all! (eg. 'INT' must not match 'INTER') */
*LineIndex += LongestMatch; /* Go past the token */
while ((**LineIndex) == ' ') /* Skip trailing spaces */
(*LineIndex) ++;
if (*Token == 0xA3 || *Token == 0xA4) /* 'SPECTRUM' or 'PLAY' ? */
switch (Is48KProgram) /* Then the program must be 128K */
{
case -1 : Is48KProgram = 0; break; /* Set the flag */
case 1 : fprintf (ErrStream, "ERROR - Line %d contains a 128K keyword, but the program\n"
"also uses UDGs \'T\' and/or \'U\'\n", BasicLineNo);
return (-2);
case 0 : break;
}
if ((WantKeyword && TokenMap[*Token].TokenType == 0) || /* Wanted keyword but got something else */
(!WantKeyword && TokenMap[*Token].TokenType == 1)) /* Did not want a keyword but got one nonetheless */
return (-1); /* Signal: match, but of wrong type */
else
return (1); /* Signal: match! */
}
int HandleNumbers (int BasicLineNo, char **BasicLine, byte **SpectrumLine)
/**********************************************************************************************************************************/
/* Pre : `BasicLineNo' holds the current BASIC line number, `BasicLine' points into the line, `SpectrumLine' points to the */
/* TAPped Spectrum line. */
/* Post : If there was a (floating point) number at this position, it has been processed into `SpectrumLine' and `LineIndex' is */
/* pointing after the number. */
/* The return value is: 0 = no number, 1 = number done, -1 = number error (already reported). */
/* Import: None. */
/**********************************************************************************************************************************/
{
#define SHIFT31BITS (double)2147483648.0 /* (= 2^31) */
char *StartOfNumber;
double Value = 0.0;
double Divider = 1.0;
double Exp = 0.0;
int IntValue;
byte Sign = 0x00;
unsigned long Mantissa;
if (!isdigit (**BasicLine) && /* Current character is not a digit ? */
(**BasicLine) != '.') /* And not a decimal point (eg. '.5') ? */
return (0); /* Then it can hardly be a number */
StartOfNumber = *BasicLine;
while (isdigit (**BasicLine)) /* First read the integer part */
Value = Value * 10 + *((*BasicLine) ++) - '0';
if ((**BasicLine) == '.') /* Decimal point ? */
{ /* Read the decimal part */
(*BasicLine) ++;
while (isdigit (**BasicLine))
Value = Value + (Divider /= 10) * (*((*BasicLine) ++) - '0');
}
if ((**BasicLine) == 'e' || (**BasicLine) == 'E') /* Exponent ? */
{
(*BasicLine) ++;
if ((**BasicLine) == '+') /* Both "Ex" and "E+x" do the same thing */
(*BasicLine) ++;
else if ((**BasicLine) == '-') /* Negative exponent */
{
Sign = 0xFF;
(*BasicLine) ++;
}
while (isdigit (**BasicLine)) /* Read the exponent value */
Exp = Exp * 10 + *((*BasicLine) ++) - '0';
if (Sign == 0x00) /* Raise the resulting value to the read exponent */
Value = Value * pow (10.0, Exp);
else
Value = Value / pow (10.0, Exp);
}
strncpy ((char *)*SpectrumLine, StartOfNumber, *BasicLine - StartOfNumber); /* Insert the ASCII value first */
(*SpectrumLine) += (*BasicLine - StartOfNumber);
IntValue = (int)floor (Value);
if (Value == IntValue && Value >= -65536 && Value < 65536) /* Small integer ? */
{
*((*SpectrumLine) ++) = 0x0E; /* Insert number marker */
*((*SpectrumLine) ++) = 0x00;
if (IntValue >= 0) /* Insert sign */
*((*SpectrumLine) ++) = 0x00;
else
{
*((*SpectrumLine) ++) = 0xFF;
IntValue += 65536; /* Maintain bug in Spectrum ROM - INT(-65536) will result in -1 */
}
*((*SpectrumLine) ++) = (byte)(IntValue & 0xFF);
*((*SpectrumLine) ++) = (byte)(IntValue >> 8);
*((*SpectrumLine) ++) = 0x00;
}
else /* Need to store in full floating point format */
{
if (Value < 0)
{
Sign = 0x80; /* Sign bit is high bit of byte 2 */
Value = -Value;
}
else
Sign = 0x00;
Exp = floor (x_log2 (Value));
if (Exp < -129 || Exp > 126)
{
fprintf (ErrStream, "ERROR - Number too big in line %d\n", BasicLineNo);
return (-1);
}
Mantissa = (unsigned long)floor ((Value / pow (2.0, Exp) - 1.0) * SHIFT31BITS + 0.5); /* Calculate mantissa */
*((*SpectrumLine) ++) = 0x0E; /* Insert number marker */
*((*SpectrumLine) ++) = (byte)Exp + 0x81; /* Insert exponent */
*((*SpectrumLine) ++) = (byte)((Mantissa >> 24) & 0x7F) | Sign; /* Insert mantissa */
*((*SpectrumLine) ++) = (byte)((Mantissa >> 16) & 0xFF); /* (Big endian!) */
*((*SpectrumLine) ++) = (byte)((Mantissa >> 8) & 0xFF);
*((*SpectrumLine) ++) = (byte)(Mantissa & 0xFF);
}
return (1);
}
int HandleBIN (int BasicLineNo, char **BasicLine, byte **SpectrumLine)
/**********************************************************************************************************************************/
/* Pre : `BasicLineNo' holds the current BASIC line number, `BasicLine' points into the line just past the BIN token, */
/* `SpectrumLine' points to the TAPped Spectrum line. */
/* Post : If there was a BINary number at this position, it has been processed into `SpectrumLine' and `LineIndex' is pointing */
/* after the number. */
/* The return value is: 1 = number done, -1 = number error (already reported). */
/* Import: None. */
/**********************************************************************************************************************************/
{
int Value = 0;
while ((**BasicLine) == '0' || (**BasicLine) == '1') /* Read only binary digits */
{
Value = Value * 2 + **BasicLine - '0';
if (Value > 65535)
{
fprintf (ErrStream, "ERROR - Number too big in line %d\n", BasicLineNo);
return (-1);
}
*((*SpectrumLine) ++) = *((*BasicLine) ++); /* (Copy digit across) */
}
*((*SpectrumLine) ++) = 0x0E; /* Insert number marker */
*((*SpectrumLine) ++) = 0x00; /* (A small integer by definition) */
*((*SpectrumLine) ++) = 0x00;
*((*SpectrumLine) ++) = (byte)(Value & 0xFF);
*((*SpectrumLine) ++) = (byte)(Value >> 8);
*((*SpectrumLine) ++) = 0x00;
return (1);
}
int ExpandSequences (int BasicLineNo, char **BasicLine, byte **SpectrumLine, bool StripSpaces)
/**********************************************************************************************************************************/
/* Pre : `BasicLineNo' holds the current BASIC line number, `BasicLine' points into the line, `SpectrumLine' points to the */
/* TAPped Spectrum line. */
/* Post : If there was an expandable '{...}' sequence at this position, it has been processed into `SpectrumLine', `LineIndex' */
/* is pointing after the sequence. Returned is -1 for error, 0 for no expansion, 1 for expansion. */
/* Import: None. */
/**********************************************************************************************************************************/
{
char *StartOfSequence;
byte Attribute = 0;
byte AttributeLength = 0;
byte AttributeVal1 = 0;
byte AttributeVal2 = 0;
byte OldCharacter;
int Cnt;
if (**BasicLine != '{')
return (0);
StartOfSequence = (*BasicLine) + 1;
/* 'CODE' and 'CAT' were added for the sole purpuse of allowing them to be OPEN #'ed as channels! */
if (!x_strnicmp (StartOfSequence, "CODE}", 5)) /* Special: 'CODE' */
{
*((*SpectrumLine) ++) = 0xAF;
(*BasicLine) += 6;
return (1);
}
if (!x_strnicmp (StartOfSequence, "CAT}", 4)) /* Special: 'CAT' */
{
*((*SpectrumLine) ++) = 0xCF;
(*BasicLine) += 5;
return (1);
}
if (!x_strnicmp (StartOfSequence, "(C)}", 4))
{ /* Form "{(C)}" -> copyright sign */
*((*SpectrumLine) ++) = 0x7F;
(*BasicLine) += 5;
if (StripSpaces)
while ((**BasicLine) == ' ') /* Skip trailing spaces */
(*BasicLine) ++;
return (1);
}
if (*StartOfSequence == '+' && *(StartOfSequence + 1) >= '1' && *(StartOfSequence + 1) <= '8' && *(StartOfSequence + 2) == '}')
{ /* Form "{+X}" -> block graphics with shift */
*((*SpectrumLine) ++) = 0x88 + (((*(StartOfSequence + 1) - '0') % 8) ^ 7);
(*BasicLine) += 4;
if (StripSpaces)
while ((**BasicLine) == ' ')
(*BasicLine) ++;
return (1);
}
if (*StartOfSequence == '-' && *(StartOfSequence + 1) >= '1' && *(StartOfSequence + 1) <= '8' && *(StartOfSequence + 2) == '}')
{ /* Form "{-X}" -> block graphics without shift */
*((*SpectrumLine) ++) = 0x80 + (*(StartOfSequence + 1) - '0') % 8;
(*BasicLine) += 4;
if (StripSpaces)
while ((**BasicLine) == ' ')
(*BasicLine) ++;
return (1);
}
if (toupper (*StartOfSequence) >= 'A' && toupper (*StartOfSequence) <= 'U' && *(StartOfSequence + 1) == '}')
{ /* Form "{X}" -> UDG */
if (toupper (*StartOfSequence) == 'T' || toupper (*StartOfSequence) == 'U') /* 'T' or 'U' ? */
switch (Is48KProgram) /* Then the program must be 48K */
{
case -1 : Is48KProgram = 1; break; /* Set the flag */
case 0 : fprintf (ErrStream, "ERROR - Line %d contains UDGs \'T\' and/or \'U\'\n"
"but the program was already marked 128K\n", BasicLineNo);
return (-1);
case 1 : break;
}
*((*SpectrumLine) ++) = 0x90 + toupper (*StartOfSequence) - 'A';
(*BasicLine) += 3;
if (StripSpaces)
while ((**BasicLine) == ' ')
(*BasicLine) ++;
return (1);
}
if (isxdigit (*StartOfSequence) && isxdigit (*(StartOfSequence + 1)) && *(StartOfSequence + 2) == '}')
{ /* Form "{XX}" -> below 32 */
if (*StartOfSequence <= '9')
(**SpectrumLine) = *StartOfSequence - '0';
else
(**SpectrumLine) = toupper (*StartOfSequence) - 'A' + 10;
if (*(StartOfSequence + 1) <= '9')
(**SpectrumLine) = (**SpectrumLine) * 16 + *(StartOfSequence + 1) - '0';
else
(**SpectrumLine) = (**SpectrumLine) * 16 + toupper (*(StartOfSequence + 1)) - 'A' + 10;
(*SpectrumLine) ++;
(*BasicLine) += 4;
if (StripSpaces)
while ((**BasicLine) == ' ')
(*BasicLine) ++;
return (1);
}
if (!x_strnicmp (StartOfSequence, "INK", 3))
{
Attribute = 0x10;
AttributeLength = 3;
}
else if (!x_strnicmp (StartOfSequence, "PAPER", 5))
{
Attribute = 0x11;
AttributeLength = 5;
}
else if (!x_strnicmp (StartOfSequence, "FLASH", 5))
{
Attribute = 0x12;
AttributeLength = 5;
}
else if (!x_strnicmp (StartOfSequence, "BRIGHT", 6))
{
Attribute = 0x13;
AttributeLength = 6;
}
else if (!x_strnicmp (StartOfSequence, "INVERSE", 7))
{
Attribute = 0x14;
AttributeLength = 7;
}
else if (!x_strnicmp (StartOfSequence, "OVER", 4))
{
Attribute = 0x15;
AttributeLength = 4;
}
else if (!x_strnicmp (StartOfSequence, "AT", 2))
{
Attribute = 0x16;
AttributeLength = 2;
}
else if (!x_strnicmp (StartOfSequence, "TAB", 3))
{
Attribute = 0x17;
AttributeLength = 3;
}
if (Attribute > 0)
{
StartOfSequence += AttributeLength;
while (*StartOfSequence == ' ')
StartOfSequence ++;
while (isdigit (*StartOfSequence))
AttributeVal1 = AttributeVal1 * 10 + *(StartOfSequence ++) - '0';
if (Attribute == 0x16 || Attribute == 0x17)
{
if (*StartOfSequence != ',')
Attribute = 0;
else
{
StartOfSequence ++; /* (Step past the comma) */
while (*StartOfSequence == ' ')
StartOfSequence ++;
while (isdigit (*StartOfSequence))
AttributeVal2 = AttributeVal2 * 10 + *(StartOfSequence ++) - '0';
}
}
if (*StartOfSequence != '}') /* Need closing bracket */
Attribute = 0;
if (Attribute > 0)
{
*((*SpectrumLine) ++) = Attribute;
*((*SpectrumLine) ++) = AttributeVal1;
if (Attribute == 0x16 || Attribute == 0x17)
*((*SpectrumLine) ++) = AttributeVal2;
(*BasicLine) = StartOfSequence + 1;
if (StripSpaces)
while ((**BasicLine) == ' ')
(*BasicLine) ++;
return (1);
}
}
if (!NoWarnings)
{
for (Cnt = 0 ; *((*BasicLine) + Cnt) && *((*BasicLine) + Cnt) != '}' ; Cnt ++)
;
if (*((*BasicLine) + Cnt) == '}')
{
OldCharacter = *((*BasicLine) + Cnt + 1);
*((*BasicLine) + Cnt + 1) = '\0';
printf ("WARNING - Unexpandable sequence \"%s\" in line %d\n", (*BasicLine), BasicLineNo);
*((*BasicLine) + Cnt + 1) = OldCharacter;
return (0);
}
}
return (0);
}
int PrepareLine (char *LineIn, int FileLineNo, char **FirstToken)
/**********************************************************************************************************************************/
/* Pre : `LineIn' points to the read line, `FileLineNo' holds the real line number. */
/* Post : Multiple spaces have been removed (unless within a string), the BASIC line number has been found and `FirstToken' is */
/* pointing at the first non-whitespace character after the line number. */
/* Bad characters are reported, as well as any other error. The return value is the BASIC line number, -1 if error, or */
/* -2 if the (empty!) line should be skipped. */
/* Import: GetLineNumber. */
/**********************************************************************************************************************************/
{
char *IndexIn;
char *IndexOut;
bool InString = FALSE;
bool SingleSeparator = FALSE;
bool StillOk = TRUE;
bool DoingREM = FALSE;
int BasicLineNo = -1;
static int PreviousBasicLineNo = -1;
IndexIn = LineIn;
IndexOut = ConvertedSpectrumLine;
while (*IndexIn && StillOk)
{
if (*IndexIn == '\t') /* EXCEPTION: Print ' */
{
*(IndexOut ++) = 0x06;
IndexIn ++;
}
else if (*IndexIn < 32 || *IndexIn >= 127) /* (Exclude copyright sign as well) */
StillOk = FALSE;
else
{
if (!DoingREM && !TokenizeREM)
if (!x_strnicmp (IndexIn, " REM ", 5) || /* Going through REM statement ? */
!x_strnicmp (IndexIn, ":REM ", 5))
DoingREM = TRUE; /* Signal: copy anything and everything ASCII */
if (InString || DoingREM)
*(IndexOut ++) = *IndexIn;
else
{
if (*IndexIn == ' ')
{
if (!SingleSeparator) /* Remove multiple spaces */
{
SingleSeparator = TRUE;
*(IndexOut ++) = *IndexIn;
}
}
else
{
SingleSeparator = FALSE;
*(IndexOut ++) = *IndexIn;
}
}
if (*IndexIn == '\"' && !DoingREM)
InString = !InString;
IndexIn ++;
}
}
*IndexOut = '\0';
if (!StillOk)
if (*IndexIn == 0x0D || *IndexIn == 0x0A) /* 'Correct' for end-of-line */
StillOk = TRUE; /* (Accept CR and/or LF as end-of-line) */
BasicLineNo = GetLineNumber (FirstToken);
if (InString)
fprintf (ErrStream, "ERROR - %s line %d misses terminating quote\n",
BasicLineNo < 0 ? "ASCII" : "BASIC", BasicLineNo < 0 ? FileLineNo : BasicLineNo);
else if (!StillOk)
fprintf (ErrStream, "ERROR - %s line %d contains a bad character (code %02Xh)\n",
BasicLineNo < 0 ? "ASCII" : "BASIC", BasicLineNo < 0 ? FileLineNo : BasicLineNo, *IndexIn);
else if (BasicLineNo < 0) /* Could not read line number */
{
if (!(**FirstToken)) /* Line is completely empty ? */
{
if (!NoWarnings)
printf ("WARNING - Skipping empty ASCII line %d\n", FileLineNo);
return (-2); /* Signal: skip entire line */
}
else
{
fprintf (ErrStream, "ERROR - Missing line number in ASCII line %d\n", FileLineNo);
StillOk = FALSE;
}
}
else if (PreviousBasicLineNo >= 0) /* Not the first line ? */
{
if (BasicLineNo < PreviousBasicLineNo) /* This line number smaller than previous ? */
{
fprintf (ErrStream, "ERROR - Line number %d is smaller than previous line number %d\n", BasicLineNo, PreviousBasicLineNo);
StillOk = FALSE;
}
else if (BasicLineNo == PreviousBasicLineNo && !NoWarnings) /* Same line number as previous ? */
printf ("WARNING - Duplicate use of line number %d\n", BasicLineNo); /* (BASIC can handle it after all...) */
}
else if (!(**FirstToken)) /* Line contains only a line number ? */
{
fprintf (ErrStream, "ERROR - Line %d contains no statements!\n", BasicLineNo);
StillOk = FALSE;
}
PreviousBasicLineNo = BasicLineNo; /* Remember this line number */
if (!InString && StillOk)
return (BasicLineNo);
else
return (-1);
}
bool CheckEnd (int BasicLineNo, int StatementNo, byte **Index)
/**********************************************************************************************************************************/
/* Pre : `BasicLineNo' holds the line number, `StatementNo' the statement number, `Index' the current position in the line. */
/* Post : A check is made whether the end of the current statement has been reached. */
/* If so, an error is reported and TRUE is returned (so FALSE indicates that everything is still fine and dandy). */
/* Import: none. */
/**********************************************************************************************************************************/
{
if (**Index == ':' || **Index == 0x0D) /* End of statement or end of line ? */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Unexpected end of statement\n", BasicLineNo, StatementNo);
return (TRUE);
}
return (FALSE);
}
bool ScanVariable (int BasicLineNo, int StatementNo, int Keyword, byte **Index, bool *Type, int *NameLen, int AllowSlicing)
/**********************************************************************************************************************************/
/* Pre : `BasicLineNo' holds the line number, `StatementNo' the statement number, `Keyword' the keyword to which this operand */
/* belongs, `Index' the current position in the line. */
/* `AllocSlicing' is one of the following values: */
/* -1 = Don't check for slicing/indexing (used by DEF FN) */
/* 0 = No slicing/indexing allowed */
/* 1 = Either slicing or indexing may follow (indices being numeric) */
/* 2 = Only numeric indexing may follow (used by LET and READ) */
/* Post : A check has been made whether there's a variable at the current position. If so, it has been skipped. */
/* Slicing is handled here as well, but notice that this is not necessarily correct! */
/* Single letter string variables can be either flat or array and both possibilities are considered here. */
/* Both "a$(1 TO 10)" and "a$(1, 2)" are correct to BASIC, but depend on whether a "DIM" statement was used. */
/* The length of the found string (without any '$') is returned in `NameLen', its type is returned in `Type' (TRUE for */
/* numeric and FALSE for string variables). The return value is TRUE is all went well. Errors have already been reported. */
/* The return value is FALSE either when no variable is at this point or an error was found. */
/* `NameLen' is returned 0 if no variable was detected here, or > 0 if in error. */
/* Import: ScanExpression. */
/**********************************************************************************************************************************/
{
bool SubType;
bool IsArray = FALSE;
bool SetTokenBracket = FALSE;
Keyword = Keyword; /* (Keep compilers happy) */
*Type = TRUE; /* Assume it will be numeric */
*NameLen = 0;
if (!isalpha (**Index)) /* The first character must be alphabetic for a variable */
return (FALSE);
*NameLen = 1;
while (isalnum (*(++ (*Index)))) /* Read on, until end of the word */
(*NameLen) ++;
if (**Index == '$') /* It's a string variable ? */
{
if (*NameLen > 1) /* String variables can only have a single character name */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - String variables can only have single character names\n",
BasicLineNo, StatementNo);
return (FALSE);
}
(*Index) ++;
*Type = FALSE;
}
#ifdef __DEBUG__
printf ("DEBUG - %sScanVariable, Type is %s\n", ListSpaces, *Type ? "NUM" : "ALPHA");
#endif
if (AllowSlicing >= 0 && **Index == '(') /* Slice the string ? */
{
#ifdef __DEBUG__
printf ("DEBUG - %sScanVariable, reading index\n", ListSpaces);
#endif
if (*NameLen > 1) /* Arrays can only have a single character name */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Arrays can only have single character names\n",
BasicLineNo, StatementNo);
return (FALSE);
}
if (AllowSlicing == 0) /* Slicing/Indexing not allowed ? */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Slicing/Indexing not allowed\n", BasicLineNo, StatementNo);
return (FALSE);
}
(*Index) ++; /* (Skip the bracket) */
if (**Index == ')') /* Empty slice "a$()" is not ok */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Empty array index not allowed\n", BasicLineNo, StatementNo);
return (FALSE);
}
if (**Index == 0xCC) /* "a$( TO num)" or "a$( TO )" */
{
if (AllowSlicing == 2)
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Slicing token \"TO\" inappropriate for arrays\n",
BasicLineNo, StatementNo);
return (FALSE);
}
}
else /* Not "a$( TO num)" nor "a$( TO )" */
{
if (!TokenBracket)
{
TokenBracket = TRUE; /* Allow complex expression */
SetTokenBracket = TRUE;
}
if (!ScanExpression (BasicLineNo, StatementNo, '(', Index, &SubType, 0)) /* First parameter */
return (FALSE);
if (SetTokenBracket)
TokenBracket = FALSE;
if (!SubType) /* Must be numeric */
{
fprintf (ErrStream, "ERROR in line %d, statement %d - Variables indices must be numeric\n", BasicLineNo, StatementNo);
return (FALSE);
}
if (**Index == ')') /* "a$(num)" is ok */
{
(*Index) ++;
#ifdef __DEBUG__
printf ("DEBUG - %sScanVariable, index ending, next char is \"%s\"\n", ListSpaces, TokenMap[**Index].Token);
#endif
return (TRUE);
}
}
if (**Index != 0xCC && **Index != ',') /* Either an array or a slice */
{