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Scanf_c.pas
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Scanf_c.pas
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(* E. Sorokin 2001, Ver 1.4 *)
(* Version for Delphi 4 and above *)
(* Assembler-level scanner routines and core functions for scanf and DeFormat *)
{$WRITEABLECONST OFF} {$EXTENDEDSYNTAX ON}
// {$DEFINE SCANF_CASE_SENSITIVE} // uncomment to make scanf case-insensitive.
{$DEFINE DEFORMAT_CASE_SENSITIVE} // comment out to make DeFormat case-insensitive
// {$DEFINE SCANF_EXCEPTIONS} // uncomment to generate exceptions in scanf_core
// {$DEFINE DEFORMAT_EXCEPTIONS} // uncomment to generate exceptions in DeFormat_core
unit Scanf_c;
interface
uses Classes;
const scOK = 1;
scOverflow = 8;
scEOF = -1;
function Scanf_core(var Buffer: PChar; var Format : PChar;
Pointers : array of Pointer) : Integer;
function Scanf_stream(Inp : TStream; var Format : PChar;
Pointers : array of Pointer)
: Integer;
function DeFormat_core(var Buffer : PChar; BufLen: Cardinal;
var Format : PChar; FmtLen: Cardinal;
Args: array of const;
DecSep, ThSep : char): Cardinal;
function StrToCurrF_core(var Buffer : PChar; BufLen : Cardinal;
var Res : Currency;
CurrStr : PChar; CurrF, NegCurrF : byte;
DecSep, ThSep : char) : Integer;
// Scans Str, assuming it starts with first digit or decimal point (no sign!)
// EShift is the integer, added to the decimal exponent
// (should be 4 for Currency and 0 otherwise, but may be used for any other purpose).
// On success returns scOK, conversion result on st(0)
// On error returns 0, st(0) undefined.
// In $Q+ mode, returns scOverflow bit is set on overflow, conversion result on st(0).
function Ext_scanner(var Str : PChar; Width : cardinal; EShift : integer; DecSep, ThSep : char) : integer;
resourcestring
SInvalidInteger = '''%s'' is not a valid integer value';
SInvalidFloat = '''%s'' is not a valid floating point value';
SInvalidFormat = 'Format ''%s'' invalid or incompatible with argument';
SArgumentMissing = 'No argument for format ''%s''';
SOverflow = 'Floating point overflow';
SIntOverflow = 'Integer overflow';
SInvalidCurrency = '''%s'' is not a valid currency value';
implementation
uses SysUtils;
function Hex_scanner(var Str : PChar; var P : int64; Width : cardinal) : integer; register;
asm
// Validity checks
JECXZ @@ret {Width was 0}
PUSH EBX {Save registers to be preserved}
PUSH ESI
PUSH EDI
// Initialize
{$IFOPT Q+}
PUSH EBP
XOR EBP,EBP {EBP used for overflow tracking}
{$ENDIF}
PUSH EAX {Put @Str on stack }
MOV EAX,[EAX]
OR EAX,EAX
JE @@Str0 {Str was NIL, quit}
XOR EBX,EBX
XOR ESI,ESI {EDI:ESI will be a 64-bit accumulator}
XOR EDI,EDI
// Main loop start
@@Loop: MOV BL,[EAX] {Get char}
CMP BL,'a'
JB @@upcase
SUB BL,'a' - 'A'
@@upcase:
SUB BL,'0'
CMP BL, 9
JBE @@digOk
SUB BL,'A' - '0'
CMP BL,5
JA @@StopScan {found illegal char}
ADD BL,10
//-------- Multiply and add start
@@digOk:
SHLD EDI,ESI,4 {64-bit unsigned multiplication by 16}
{$IFOPT Q+}
ADC EBP,0 {If CF was set at least once, EDX > 0}
{$ENDIF}
SHL ESI,4
OR ESI,EBX {Add BL}
//-------- Multiply and add end
INC EAX
DEC ECX
JNZ @@Loop
// Main loop end
@@StopScan:
POP EBX {Original @Str}
XOR ECX,ECX
CMP [EBX],EAX {Were there valid chars?}
JE @@Exit {No valid characters found}
MOV [EBX],EAX {Store new Str}
INC ECX {Set 1 as Result}
OR EDX,EDX
JZ @@Exit {Pointer was NIL, no assignment}
MOV [EDX+4],EDI {store high dword of _int64}
MOV [EDX],ESI {store low dword}
@@Exit:
{$IFOPT Q+}
OR EBP,EBP
POP EBP
JNA @@NoOverflow
OR ECX,scOverflow
@@NoOverflow:
{$ENDIF}
POP EDI {restore registers to be preserved}
POP ESI
POP EBX
@@ret:
MOV EAX,ECX {set return code to Result}
RET
@@Str0:
XOR ECX,ECX
POP EBX
JMP @@Exit
end;
function Oct_scanner(var Str : PChar; var P : int64; Width : cardinal) : integer; register;
asm
// Validity checks
JECXZ @@ret {Width was 0}
PUSH EBX {Save registers to be preserved}
PUSH ESI
PUSH EDI
// Initialize
{$IFOPT Q+}
PUSH EBP
XOR EBP,EBP {EBP used for overflow tracking}
{$ENDIF}
PUSH EAX {Put @Str on stack }
MOV EAX,[EAX]
OR EAX,EAX
JE @@Str0 {Str was NIL, quit}
XOR EBX,EBX
XOR ESI,ESI {EDI:ESI will be a 64-bit accumulator}
XOR EDI,EDI
// Main loop start
@@loop: MOV BL,[EAX] {Get char}
SUB BL,'0'+8
ADD BL,8
JNC @@StopScan {found illegal char}
SHLD EDI,ESI,3 {64-bit unsigned multiplication by 8}
{$IFOPT Q+}
ADC EBP,0 {Once CF set, EDX > 0}
{$ENDIF}
SHL ESI,3
OR ESI,EBX {Add BL}
INC EAX
DEC ECX
JNZ @@loop
// Main loop end
@@StopScan:
POP EBX {Original @Str}
XOR ECX,ECX
CMP [EBX],EAX {Were there valid chars?}
JE @@Exit {No valid characters found}
MOV [EBX],EAX {Store new Str}
INC ECX {Set 1 as Result}
OR EDX,EDX
JZ @@Exit {Pointer was NIL, no assignment}
MOV [EDX+4],EDI {store high dword of _int64}
MOV [EDX],ESI {store low dword}
@@Exit:
{$IFOPT Q+}
OR EBP,EBP
POP EBP
JNA @@NoOverflow
OR ECX,scOverflow
@@NoOverflow:
{$ENDIF}
POP EDI {restore registers to be preserved}
POP ESI
POP EBX
@@ret:
MOV EAX,ECX {set return code to Result}
RET
@@Str0:
XOR ECX,ECX
POP EBX
JMP @@Exit
end;
function Dec_scanner(var Str : PChar; var P : int64; Width : cardinal) : integer; register;
asm
// Validity checks
JECXZ @@ret {Width was 0}
PUSH EBX {Save registers to be preserved}
PUSH ESI
PUSH EDI
// Initialize
{$IFOPT Q+}
PUSH EBP
XOR EBP,EBP {EBP used for overflow tracking}
{$ENDIF}
PUSH EAX {Put @Str on stack }
MOV EAX,[EAX]
OR EAX,EAX
JE @@Str0 {Str was NIL, quit}
PUSH EDX {Put P on stack }
MOV ESI,EAX {use ESI for Str}
XOR EBX,EBX
XOR EDI,EDI {EDI:EAX will be a 64-bit accumulator}
XOR EAX,EAX
// Main loop start
@@loop: MOV BL,[ESI] {Get char}
SUB BL,'0'+10
ADD BL,10
JNC @@StopScan {found illegal char}
//=== Unsigned multiplication by 10 start
{$IFOPT Q+}
CMP EDI,$33333333 { $FFFFFFFF div 5}
JNA @@Less
INC EBP
@@Less:
{$ENDIF}
LEA EDI,[EDI+4*EDI]
MOV EDX,10
MUL EDX
ADD EAX,EBX {Add BL}
ADC EDX,0
{$IFOPT Q+}
SHL EDI,1
ADC EBP,0
ADD EDI,EDX
ADC EBP,0
{$ELSE}
LEA EDI,[EDI*2+EDX]
{$ENDIF}
//=== Unsigned multiplication by 10 end
INC ESI
DEC ECX
JNZ @@loop
// Main loop end
@@StopScan:
POP EDX {Get back P}
POP EBX {Original @Str}
XOR ECX,ECX
CMP [EBX],ESI {Were there valid chars?}
JE @@Exit {No valid characters found}
MOV [EBX],ESI {Store new Str}
INC ECX {Set 1 as Result}
OR EDX,EDX
JZ @@Exit {Pointer was NIL, no assignment}
MOV [EDX+4],EDI {store high dword of _int64}
MOV [EDX],EAX {store low dword}
@@Exit:
{$IFOPT Q+}
OR EBP,EBP
POP EBP
JNA @@NoOverflow
OR ECX,scOverflow
@@NoOverflow:
{$ENDIF}
POP EDI {restore registers to be preserved}
POP ESI
POP EBX
@@ret:
MOV EAX,ECX {set return code to Result}
RET
@@Str0:
XOR ECX,ECX
POP EBX
JMP @@Exit
end;
const single10 : single = 10.0;
single1000 : single = 1000.0;
// 10.0 and 1000.0 have exact representations, single precision is sufficient
// FMUL with single is the fastest [The 386 Book].
function Ext_scanner(var Str : PChar; Width : cardinal; EShift : integer; DecSep, ThSep : char) : integer; register;
var Tmp : integer;
SaveCW : word;
NewCW : word;
asm
// Initialization start
or edx,edx // check Width
jz @@ret
fnstcw SaveCW // Save FPU control word
push edi
push esi
push ebx
fnclex // just in case some garbage is there
mov NewCW,$33f // full precision, ignore errors
push eax // remember @str point on stack
mov esi,[eax] // ESI will be Str
fldcw NewCW
fldz // initialize accumulator
push ecx // remember EFactor
xor ecx,ecx // fractional part length
xor edi,edi // exponent
xor ebx,ebx // general pusrpose
// Initialization end
// Integer part start
xor eax,eax // inititate integer loop
@@intloop:
mov al,[esi]
sub al,'0'+10
add al,10
jnc @@ThSep // two checks in one!
inc esi // accept
fmul single10
inc ebx // use ebx as digit counter
mov Tmp,eax
fiadd Tmp
dec edx
jnz @@intloop
jmp @@OK
// Integer part end
//============ ThSep block ========================
// edi counts thousand groups, edi=0 means no thousand groups
@@ThSep:
cmp ThSep,0
je @@DecSep // ThSep=#0, forget it
sub ebx,1+3 // ebx must be 1, 2 or 3
add ebx,3
jnc @@bDecSep
sub edx,4
jc @@ThDecSep // Less than 4 characters left, ThSep not allowed
mov ebx,[esi]
@@Thloop:
xor eax,eax
cmp bl, ThSep
jne @@ThDecSep
inc edi
shr ebx,8 // first digit in bl
inc esi
sub bl,'0'+10
add bl,10
jnc @@error
mov al,bl
shr ebx,8 // second digit in bl
inc esi
sub bl,'0'+10
add bl,10
jnc @@error
lea eax,[eax+eax*4]
add eax,eax
add al,bl // al <= 90, no carry possible
shr ebx,8 // third digit in bl
inc esi
sub bl,'0'+10
add bl,10
jnc @@error
fmul single1000 // finally...
lea eax,[eax+eax*4]
lea eax,[ebx+eax*2]
mov Tmp,eax
inc esi
fiadd Tmp
sub edx,4 // Try next thousand group
jc @@ThDecSep // Less than 4 characters left, exit Thloop
mov ebx,[esi]
jmp @@Thloop
//============ End of ThSep block ====================
// Fractional part start
@@ThdecSep:
add edx,4 // compensate edx check in ThSep block
mov al,[esi]
sub al,'0'
@@bdecSep:
inc ebx // compensate ebx check in ThSep block
@@decSep:
mov ah,DecSep
sub ah,'0'
cmp al,ah
jne @@E // not DecSep, try E
inc esi
dec edx
jz @@OK // edx=0, finished anyway
xor eax,eax // initiate fraction loop
mov ecx,edx // remember edx in ecx
@@fracloop:
mov al,[esi]
sub al,'0'+10
add al,10
jnc @@fracEnd // two checks in one!
inc esi
fmul single10
mov Tmp,eax
fiadd Tmp
dec edx
jnz @@fracloop
xor edi,edi // bring edi back to 0
jmp @@OK // edx = 0, nothing to subtract from ecx
@@fracEnd:
sub ecx,edx // ecx now is number of digits in a fraction part
// Fractional part end
// Exponent start
@@E:
cmp edi,0
mov edi,0
jnz @@OK // edi was not 0, no exp
add ebx,ecx
jz @@Error // ebx=0 and ecx=0 mean no digits found, error
mov al,[esi]
and al,$df // Upcase(al)
cmp al,'E'
jnz @@OK
inc esi
dec edx
jz @@OK // width reached
mov al,[esi]
xor ebx,ebx // use ebx as '-' flag
cmp al,'+'
jz @@pmyes
cmp al,'-'
jnz @@doexp
dec ebx
@@pmyes:
inc esi
dec edx
jz @@OK // width reached
@@doexp:
xor eax,eax // inititate exponent loop
@@exploop:
mov al,[esi]
sub al,'0'+10
add al,10
jnc @@EndExp // two checks in one!
inc esi // accept
lea edi,[edi+4*edi] // edi:=edi*5
lea edi,[2*edi+eax] // edi = edi + edi + eax
dec edx
jnz @@exploop
@@EndExp:
cmp ebx,0 // ebx <> 0 means '-'
jz @@OK
neg edi
// Exponent end
// Combine parts start
// At this point, edi is the exponent and ecx is the fractional part length
@@OK:
mov eax,edi // get exponent into eax
sub eax,ecx // decrease by fractional part length
pop ecx // restore EFactor
add eax,ecx // add to exponent
jz @@NoPower
call FPower10 // multiply st(0) by eax^10
@@NoPower:
mov edx,1 // return Result=1
{$IFOPT Q+}
fstsw ax
and eax,8 // FPU overflow mask
or edx,eax // simply add to edx
{$ENDIF}
jmp @@finish
// Combine parts end
@@error:
fstp st(0) // clear up FPU stack
pop eax // clear up stack
xor edx,edx // set Result to 0
@@finish:
fnclex // clear up
fldcw SaveCW // restore FPU control word
pop eax
mov [eax],esi // store new Str
pop ebx
pop esi
pop edi
@@ret:
mov eax,edx // set result
end;
const singleINFasLongint : longint = $7f800000; // infinity
q_singleNANasLongint : longint = $7fC00000; // quiet NAN
var singleINF : single absolute singleINFasLongint;
q_singleNAN : single absolute q_singleNANasLongint;
type TCharSet = set of AnsiChar;
PInt = ^Integer;
TscRec = packed record // Has size of an integer
Case byte of
0: ( Typ : byte; Size : char; Flags : word;);
1: ( SizeType : word; iFlags : smallInt;);
end;
// Somewhat complicated structure of possible variable types.
const scIllegal = -1; // illegal value, no assignment possible
scChar = vtChar;
scPChar = vtPChar;
scInteger = vtInteger;
scFloat = vtExtended;
scCurrency= vtCurrency;
scCharSet = $7e;
scNspec = $7f; // "n" specifier
scUpperL = Ord('L') shl 8; // Size specifiers
scLowerL = Ord('l') shl 8;
scUpperH = Ord('H') shl 8;
scLowerh = Ord('h') shl 8;
scShortInt= scInteger + scUpperH;
scSmallInt= scInteger + scLowerH;
scLongInt = scInteger + scLowerL;
scInt64 = scInteger + scUpperL;
scReal = scFloat + scUpperH;
scSingle = scFloat + scLowerH;
scDouble = scFloat + scLowerL;
scExtended= scFloat + scUpperL;
scAnsi = scLowerL;
scShort = scLowerH;
scShortSet= scCharSet + scShort;
scAnsiSet = scCharSet + scAnsi;
scString = scPChar + scShort;
scAnsiStr = scPChar + scAnsi;
// Flags constants
scHex = $1;
scDecimal = $2;
scOctal = $4;
scBaseMask = scHex or scDecimal or scOctal;
sc1000Sep = $10;
scIntSpec = $20; // l8, l16, l32, l64 can be used only with integer types
scUnsigned = $40; // Not really implemented, as in BC++
scFormatted = $80; // Formatted currency in DeFormat
scNoAssign =$8000; // Just negative bit
defWidth = MaxInt; // no width limit by default
const
CurrFmts : array [0..3] of string =
( '%s%%m', // 0 = $1
'%%m%s', // 1 = 1$
'%s %%m', // 2 = $ 1
'%%m %s' // 3 = 1 $
);
NegCurrFmts : array [0..15] of string =
( '(%s%%m)', // 0 = ($1)
'-%s%%m', // 1 = -$1
'%s%%m', // 2 = $-1
'%s%%m-', // 3 = $1-
'(%%m%s)', // 4 = (1$)
'%%m%s', // 5 = -1$
'%%m-%s', // 6 = 1-$
'%%m%s-', // 7 = 1$-
'%%m %s', // 8 = -1 $
'-%s %%m', // 9 = -$ 1
'%%m %s-', // 10 = 1 $-
'%s%%m-', // 11 = $ 1-
'%s %%m', // 12 = $ -1
'%%m- %s', // 13 = 1- $
'(%s %%m)', // 14 = ($ 1)
'(%%m %s)' // 15 = (1 $)
);
function StrToCurrF_core(var Buffer : PChar; BufLen : Cardinal;
var Res : currency;
CurrStr : PChar; CurrF, NegCurrF : byte;
DecSep, ThSep : char) : Integer;
var Fmt : string;
FPtr : PChar;
begin
Fmt:=Format( NegCurrFmts[NegCurrF], [CurrStr]); // Try negative first
FPtr:=PChar(Fmt);
{$IFDEF DEFORMAT_EXCEPTIONS}
try
{$ENDIF}
Result:=DeFormat_core(Buffer, Buflen, FPtr, Length(Fmt), [@Res], DecSep, ThSep);
{$IFDEF DEFORMAT_EXCEPTIONS}
except on EConvertError do {nothing}; end;
{$ENDIF}
if (Result=1) then
Case NegCurrF of
1,4,9,14,15 : Res:=-Res;
2,5,8,12 : {Negative and positive formats are compatible} ;
else{3,6,7,10,11,13:}
If Fptr^=#0 then Res:=-Res {scanned FPtr to the end, minus was there!}
else Result:=0; {Something gone wrong!}
end;
If (Result <> 1) then begin {negative did not work, try positive}
Fmt:=Format(CurrFmts[CurrF],[CurrStr]);
FPtr:=PChar(Fmt);
Result:=DeFormat_core(Buffer, Buflen, FPtr, Length(Fmt), [@Res], DecSep, ThSep);
end;
end;
// *********** Common routines *******************************************//
// Scan numerical string (float, decimal, $hex or 0x..)
// Str : points to the first char in a string
// Width : maximum length and assumed to not exceed actual length
// FType : type and length of result, see scXXXX constants
// P : where to put the conversion result if scNoAssign is not set.
// Result : 0 on error, > 0 on success (e.g. scOverflow in $Q+ mode)
function NumScan(var Str : PChar; Width : integer;
FType : integer; P : Pointer;
DecSep, ThSep : char) : integer;
var X : extended;
i64 : int64 absolute X;
L : longint absolute X;
Cur : Currency absolute X;
{$IFOPT Q+} SaveCW, NewCW : word; {$ENDIF}
Negative : boolean;
Label doHex, doDec, doOct, Cont;
begin
With TscRec(FType) do begin
Negative:=False;
Case Str^ of // Get sign, if any
'-' : begin Negative:=True; Inc(Str); Dec(Width); end;
'+' : begin Inc(Str); Dec(Width); end;
end;
Result:=0; // keep compiler happy...
Case Typ of
scInteger :
begin
Case (Flags and scBaseMask) of
scHex : doHex: Result:=Hex_Scanner( Str, i64, Width);
scOctal : doOct: Result:=Oct_Scanner( Str, i64, Width);
scDecimal : doDec: Result:=Dec_Scanner( Str, i64, Width);
else // Base decision block
Case Str^ of
'$' : begin Inc(Str); Dec(Width); goto doHex; end;
'0' : If (Str[1] = 'x') or (Str[1] = 'X') then begin
Inc(Str,2); Dec(Width,2); goto doHex;
end else
if (Flags and scOctal <> 0) then goto doOct else goto doDec;
else goto doDec;
end;
end;
if (Result <= 0) then Exit;
if Negative then
asm
neg dword ptr [X][4]
neg dword ptr [X]
sbb dword ptr [X][4],0
end;
end;
scCurrency :
begin
Result:=Ext_Scanner(Str, Width, 4, DecSep, ThSep);
if Result > 0 then begin
{$IFOPT Q-}
if iFlags >= 0 then begin
if Negative then asm fchs; end;
asm
mov eax, [P]
fistp qword ptr [eax];
fnstsw ax
fnclex // Clear possible exceptions
end;
end else asm fstp st(0); end; // Just clear the FPU stack
{$ELSE}
if Negative then asm fchs; end;
asm
fstcw SaveCW
mov NewCW,$33f // Mask exceptions
fldcw NewCW
fistp qword ptr [X];
fnstsw ax
and eax,8+1 // FPU overflow and invalidop mask
jz @@OK
or [Result],8
@@OK: fldcw SaveCW
fnclex // Clear exceptions
end;
if iFlags <> 0 then Currency(P^):=Cur;
{$ENDIF}
end;
Exit;
end;
scFloat :
begin
if (Width >=3) then begin // Check NAN and INF
Case ( (PInt(Str))^ and $00ffffff) of
$004e414e {'NAN'#0}: begin if Negative then X:=-q_singleNAN else X:=q_singleNAN; Inc(Str,3); Result:=scOK; goto Cont; end;
$00464e49 {'INF'#0}: begin if Negative then X:=-singleINF else X:=singleINF; Inc(Str,3); Result:=scOK; goto Cont; end;
end;
end;
Result:=Ext_Scanner(Str, Width, 0, DecSep, Char(Ord(ThSep)*Integer( (Flags and sc1000Sep) <> 0)));
if (Result <= 0) or (FType < 0) then Exit else begin
if Negative then asm fchs; end;
asm fstp [X]; end;
end;
Cont:
end;
end; {Case Typ}
if (FType > 0) then begin // If scNoAssign not set, assign
Case SizeType of
{$IFOPT R-}
scShortInt : ShortInt(P^):=L;
scSmallInt : SmallInt(P^):=L;
scInteger, scLongInt : LongInt(P^) :=L;
{$ELSE} //signed and unsigned have different ranges
scShortInt : If (Flags and scUnsigned) = 0 then ShortInt(P^):=L else Byte(P^):=L;
scSmallInt : If (Flags and scUnsigned) = 0 then SmallInt(P^):=L else Word(P^):=L;
scInteger, scLongInt : If (Flags and scUnsigned) = 0 then LongInt(P^) :=L else LongWord(P^):=L;
{$ENDIF}
scSingle : Single(P^):=X;
scReal : real48(P^):=X;
scDouble : Double(P^):=X;
scExtended : Extended(P^):=X;
scInt64 : int64(P^):=i64;
end;
end;
end;
end;
// Parse a search-set specifier in format string
// Return value : set of allowed characters
// Format is updated to the first unparsed character
// On error result is False
function ParseSet(var Format : PChar; FmtEnd : PChar; var Res : TCharSet) : boolean;
type T32Int = array [0..7] of integer;
var TI : T32Int absolute Res;
i : integer;
Neg : boolean;
begin // Assume that Format points to a character after opening "["
Res:=[]; Result:=False;
If Format >= FmtEnd then Exit;
If Format^='^' then begin // Check for '^'
Neg:=True;
Inc(Format);
If Format >= FmtEnd then Exit;
end else Neg:=False;
Case Format^ of // Check special cases: first ']' or '-'
']','-' :
begin
// Res:=Res+[Format^];
TI[Byte(Format^) shr 5]:=TI[Byte(Format^) shr 5] or (1 shl ( Byte(Format^) and 31));
Inc(Format);
end;
end;
while Format < FmtEnd do
if Format^ = ']' then begin
Result:=True;
Inc(Format);
Break;
end else
if (Format[1]='-') and (Format[2] <> ']') then begin // Range
Res:=Res+[Format^..Format[2]];
Inc(Format,3);
end else begin
// Res:=Res + [Format^];
TI[Byte(Format^) shr 5]:=TI[Byte(Format^) shr 5] or (1 shl ( Byte(Format^) and 31));
Inc(Format);
end;
if Neg then
// Res:=[#0..#255]-Res;
for i:=0 to 7 do TI[i]:= not TI[i];
end;
// Process [size] type portions of a format specifier
// On error, scIllegal is returned
function GetSizeType(var Format : PChar) : TscRec;
var FType : TscRec;
PW : ^word absolute Format;
begin
Integer(Result):=scIllegal; Integer(FType):=0;// Initialization
With FType do begin
Case Format^ of // check size specifiers
'H','h','L' :
begin
Size:=Format^;
Inc(Format);
end;
'l' :
begin
Inc(Format);
Case Format^ of
'8' : begin Size:='H'; Inc(Format); Flags:=Flags or scIntSpec; end;
'l' : begin Size:='L'; Inc(Format); end;
else
Case PW^ of
$3631 {'16'} : begin Size:='h'; Inc(Format,2); Flags:=Flags or scIntSpec; end;
$3332 {'32'} : begin Size:='l'; Inc(Format,2); Flags:=Flags or scIntSpec; end;
$3436 {'64'} : begin Size:='L'; Inc(Format,2); Flags:=Flags or scIntSpec; end;
else Size:='l';
end;
end;
end;
end;
Case UpCase(Format^) of
#0 : Exit;
'[' : Typ:=scCharSet;
'I' : begin Typ:=scInteger; Flags:=Flags or scDecimal or scHex or scOctal; end;
'D' : begin Typ:=scInteger; Flags:=Flags or scDecimal; end;
'U' : begin Typ:=scInteger; Flags:=Flags or scDecimal or scUnsigned; end;
'X' : begin Typ:=scInteger; Flags:=Flags or scHex; end;
'O' : begin Typ:=scInteger; Flags:=Flags or scOctal; end;
'F','G','E' : begin Typ:=scFloat; Flags:=Flags or scDecimal; end;
'N' : Typ:=scNspec;
'S' : Typ:=scPChar;
// No size specs. allowed:
'C' : if Size=#0 then Typ:=scChar else Exit;
'P' : if Size = #0 then begin
Typ:=scInteger; Flags:=Flags or scHex;
end else Exit;
'M' : if Size=#0 then begin
Typ:=scCurrency;
if Format^='M' then Flags:=Flags or scFormatted;
end else Exit;
else begin Dec(Format); Exit; end;
end;
Case Typ of
scPChar, scCharSet :
Case Size of
'H', 'L' : Exit; // 'H' and 'L' not allowed with strings
end;
end;
Inc(Format);
end; { With Ftype}
Result:=FType;
end;
// *********** DeFormat ***********************************************//
function DeFormat_core(var Buffer : PChar; BufLen: Cardinal;
var Format : PChar; FmtLen: Cardinal;
Args: array of TVarRec;
DecSep, ThSep : char): Cardinal;
var // Many of these will be optimized out
Count : cardinal;
Index, Width : integer;
Buf, Marker, Fmt : PChar;
{$IFDEF DEFORMAT_EXCEPTIONS} FMarker : PChar; {$ENDIF}
Temp : integer;
Ptr : Pointer;
BufEnd : PChar absolute BufLen;
FmtEnd : PChar absolute FmtLen;
SCR : TscRec;
FType : integer absolute SCR;
theSet : TCharSet;
Label BadArg, BadFormat, CopyStr, DoFloat;
function ScanToFormat : boolean;
begin
ScanToFormat:=False;
while (Fmt < FmtEnd) and (Buf < BufEnd) do begin
case Fmt^ of
'%' : begin
Inc(Fmt);
if Fmt^='%' then // this is "%%", check for "%" in Buf
If Buf^ <> '%' then Exit
else begin Inc(Buf); Inc(Fmt); end
else begin
ScanToFormat:=True; // Start of Fmt specifier found.
Exit;
end;
end;
#0..#32 : begin
while (Buf < BufEnd) and (Buf^ <=' ') do Inc(Buf);
while (Fmt < FmtEnd) and (Fmt^ <=' ') do Inc(Fmt);
end;
else begin
{$IFNDEF DEFORMAT_CASE_SENSITIVE}
if Buf^ <> Fmt^ then Exit;
{$ELSE}
if UpCase(Buf^) <> UpCase(Fmt^) then Exit;
{$ENDIF}
Inc(Buf);
Inc(Fmt);
end;
end;
end; {While}
end;
// Returns: -1 in case of '*' error
// 0 on success
// 1 in case of numerical input error
function GetNumFields : integer;
var Temp : cardinal;
GotTemp, GotIndex : boolean;
begin
GotIndex:=False;
Temp:=0; // not really necessary, but this will suppress compiler's warning.
repeat
GotTemp:=False;
if Fmt^='*' then begin // Get indirect entry into Temp
Inc(Fmt);
If (Index <= High(Args)) and (Args[Index].VType=vtInteger) then
begin
Temp:=Args[Index].VInteger;
Inc(Index);
GotTemp:=True;
end else begin Result:=-1; Exit; end;
end else begin // Get explicit numerical entry into Temp
if Fmt^='-' then Inc(Fmt); // minus is ignored on scanning
Temp:=0; //start simple decimal input loop
while (Fmt^ >= '0') and (Fmt^ <= '9') do begin
Temp:=Temp*10+Ord(Fmt^)-Ord('0');
Inc(Fmt); GotTemp:=True;
end;
end;
Case Fmt^ of
':' : If (not GotIndex) and GotTemp then begin
Index:=Temp; Inc(Fmt); GotIndex:=True;
end else begin
Result:=1; Exit;
end;
'.' : begin
If GotTemp then Width:=Temp;
Inc(Fmt); // OK, now ignore precision in any form
If Fmt^='*' then begin Inc(Index); Inc(Format); end
else while (Fmt^ >= '0') and (Fmt^ <= '9') do Inc(Fmt);
Break;
end;
else begin
If GotTemp then Width:=Temp;
Break;
end;
end; {Case}
until Fmt^ <> ':';
Result:=0;
end;
begin
Buf:=Buffer; Fmt:=Format; FmtEnd:=Fmt+FmtLen; BufEnd:=Buf+BufLen; Index:=0; Result:=0; // initialization
{$IFDEF DEFORMAT_EXCEPTIONS}
try
{$ENDIF}
while ScanToFormat do // ScanToFormat returns False if end is reached
with SCR do begin
Width:=0;
{$IFDEF DEFORMAT_EXCEPTIONS} FMarker:=Fmt-1; {$ENDIF}
Case GetNumFields of
-1 : BadArg : begin
{$IFDEF DEFORMAT_EXCEPTIONS}
raise EConvertError.CreateFmt(SArgumentMissing,[Copy(FMarker, 1, Fmt-FMarker+1)]);
{$ENDIF}
Break;
end;
1 : BadFormat : begin
{$IFDEF DEFORMAT_EXCEPTIONS}
raise EConvertError.CreateFmt(SInvalidFormat, [Copy(FMarker, 1, Fmt-FMarker+2)]);
{$ENDIF}
Break;
end;
end;
SCR:=GetSizeType(Fmt);
Ptr:=NIL;
if (Ftype > 0) then begin
if Index > High(Args) then goto BadArg else Ptr:=Args[Index].VPointer;
if Ptr=NIL then Flags:=Flags or scNoAssign; // DeFormat treats NIL as NoAssign
end;
if Typ = scNSpec then begin
Flags:=Flags or sc1000Sep;
Typ:=scFloat;
end;
Case Typ of
scPChar, scFloat, scInteger, scCurrency : // Skip blank space for these formats
begin
while (Buf <= BufEnd) and (Buf^ <= ' ') do Inc(Buf);
if Buf >= BufEnd then Break;
end;
scCharSet : if not ParseSet(Fmt, FmtEnd, theSet) then goto BadFormat;
scChar : if Width = 0 then Inc(Width);
end;
if Width = 0 then Width:=defWidth;
if Width > BufEnd-Buf then Width := BufEnd-Buf; // Set maximum width
Marker:=Buf;
Case Typ of
scChar : begin
if FType > 0 then
Case Args[Index].VType of
vtPChar, vtPointer : Move(Buf^, Ptr^, Width);
else goto BadArg;
end;
Inc(Buf, Width);
end;
scCharSet : begin
for Count:=1 to Width do if (Buf^ in theSet) then Inc(Buf) else Break;
goto CopyStr;