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str2intalter.pas
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str2intalter.pas
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{****************************************************************************
* *
* Alternative set of string-to-int conversion routines for 32/64-bit CPUs. *
* *
* Copyright(c) 2022 A.Koverdyaev(avk) *
* *
* This code is free software; you can redistribute it and/or modify it *
* under the terms of the MIT License. *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*****************************************************************************}
unit Str2IntAlter;
{$MODE OBJFPC}{$H+}
{.$DEFINE NEED_VAL_COMPAT}//uncomment if full compatibility with Val() is required
interface
{ parsing rules are basically the same as in the built-in Val():
leading spaces and tabs are allowed;
a minus sign is not allowed for unsigned integers;
if input string represents a numerical value in decimal notation, or a negative number,
then the numerical value MUST fit into the range of the type of aValue;
if input string represents a numerical value in binary, octal or hexadecimal notation,
and does not contain a minus sign, then the numerical value MUST fit into the unsigned
counterpart of the type of aValue and will be casted to the type of aValue;
hex notation can use the same prefixes as Val();
if NEED_VAL_COMPAT is defined, then other supported prefixes are the same as in Val(),
otherwise:
binary notation can be prefixed with %(Pascal), 0b, or 0B(C, Python ...);
octal notation can be prefixed with &(Pascal), 0(C, Python 2), 0O or 0o(Python 3, Nim);
if the Try...2Int() function returns False, then aValue is undefined }
function TryChars2Int(const a: array of char; out aValue: Byte): Boolean;
function TryChars2Int(const a: array of char; out aValue: ShortInt): Boolean;
function TryChars2Int(const a: array of char; out aValue: Word): Boolean;
function TryChars2Int(const a: array of char; out aValue: SmallInt): Boolean;
function TryChars2Int(const a: array of char; out aValue: LongWord): Boolean;
function TryChars2Int(const a: array of char; out aValue: LongInt): Boolean;
function TryChars2Int(const a: array of char; out aValue: QWord): Boolean;
function TryChars2Int(const a: array of char; out aValue: Int64): Boolean;
function TryChars2ByteDef(const a: array of char; aDefault: Byte = 0): Byte;
function TryChars2ShortIntDef(const a: array of char; aDefault: ShortInt = 0): ShortInt;
function TryChars2WordDef(const a: array of char; aDefault: Word = 0): Word;
function TryChars2SmallIntDef(const a: array of char; aDefault: SmallInt = 0): SmallInt;
function TryChars2DWordDef(const a: array of char; aDefault: DWord = 0): DWord;
function TryChars2IntDef(const a: array of char; aDefault: LongInt = 0): LongInt;
function TryChars2QWordDef(const a: array of char; aDefault: QWord = 0): QWord;
function TryChars2Int64Def(const a: array of char; aDefault: Int64 = 0): Int64;
function TryStr2Int(const s: string; out aValue: Byte): Boolean; inline;
function TryStr2Int(const s: string; out aValue: ShortInt): Boolean; inline;
function TryStr2Int(const s: string; out aValue: Word): Boolean; inline;
function TryStr2Int(const s: string; out aValue: SmallInt): Boolean; inline;
function TryStr2Int(const s: string; out aValue: LongWord): Boolean; inline;
function TryStr2Int(const s: string; out aValue: LongInt): Boolean; inline;
function TryStr2Int(const s: string; out aValue: QWord): Boolean; inline;
function TryStr2Int(const s: string; out aValue: Int64): Boolean; inline;
function TryStr2ByteDef(const s: string; aDefault: Byte = 0): Byte; inline;
function TryStr2ShortIntDef(const s: string; aDefault: ShortInt = 0): ShortInt; inline;
function TryStr2WordDef(const s: string; aDefault: Word = 0): Word; inline;
function TryStr2SmallIntDef(const s: string; aDefault: SmallInt = 0): SmallInt; inline;
function TryStr2DWordDef(const s: string; aDefault: DWord = 0): DWord; inline;
function TryStr2IntDef(const s: string; aDefault: LongInt = 0): LongInt; inline;
function TryStr2QWordDef(const s: string; aDefault: QWord = 0): QWord; inline;
function TryStr2Int64Def(const s: string; aDefault: Int64 = 0): Int64; inline;
function TrySStr2Int(const s: shortstring; out aValue: Byte): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: ShortInt): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: Word): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: SmallInt): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: LongWord): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: LongInt): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: QWord): Boolean; inline;
function TrySStr2Int(const s: shortstring; out aValue: Int64): Boolean; inline;
function TrySStr2ByteDef(const s: shortstring; aDefault: Byte = 0): Byte; inline;
function TrySStr2ShortIntDef(const s: shortstring; aDefault: ShortInt = 0): ShortInt; inline;
function TrySStr2WordDef(const s: shortstring; aDefault: Word = 0): Word; inline;
function TrySStr2SmallIntDef(const s: shortstring; aDefault: SmallInt = 0): SmallInt; inline;
function TrySStr2DWordDef(const s: shortstring; aDefault: DWord = 0): DWord; inline;
function TrySStr2IntDef(const s: shortstring; aDefault: LongInt = 0): LongInt; inline;
function TrySStr2QWordDef(const s: shortstring; aDefault: QWord = 0): QWord; inline;
function TrySStr2Int64Def(const s: shortstring; aDefault: Int64 = 0): Int64; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Byte): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: ShortInt): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Word): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: SmallInt): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: LongWord): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: LongInt): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: QWord): Boolean; inline;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Int64): Boolean; inline;
function TryStr2ByteDef(p: PChar; aCount: SizeInt; aDefault: Byte = 0): Byte; inline;
function TryStr2ShortIntDef(p: PChar; aCount: SizeInt; aDefault: ShortInt = 0): ShortInt; inline;
function TryStr2WordDef(p: PChar; aCount: SizeInt; aDefault: Word = 0): Word; inline;
function TryStr2SmallIntDef(p: PChar; aCount: SizeInt; aDefault: SmallInt = 0): SmallInt; inline;
function TryStr2DWordDef(p: PChar; aCount: SizeInt; aDefault: DWord = 0): DWord; inline;
function TryStr2IntDef(p: PChar; aCount: SizeInt; aDefault: LongInt = 0): LongInt; inline;
function TryStr2QWordDef(p: PChar; aCount: SizeInt; aDefault: QWord = 0): QWord; inline;
function TryStr2Int64Def(p: PChar; aCount: SizeInt; aDefault: Int64 = 0): Int64; inline;
{ only for strings in decimal notation;
leading spaces and tabs are allowed;
leading zeros are allowed;
a minus sign is not allowed for unsigned integers;
numerical value MUST fit into the range of the type of aValue;
if the TryDecimals2Int() returns False, then aValue is undefined }
function TryDecimals2Int(const a: array of char; out aValue: LongWord): Boolean;
function TryDecimals2Int(const a: array of char; out aValue: LongInt): Boolean;
function TryDecimals2Int(const a: array of char; out aValue: QWord): Boolean;
function TryDecimals2Int(const a: array of char; out aValue: Int64): Boolean;
function TryDecimals2DWordDef(const a: array of char; aDefault: LongWord = 0): DWord;
function TryDecimals2IntDef(const a: array of char; aDefault: LongInt = 0): Int64;
function TryDecimals2QWordDef(const a: array of char; aDefault: QWord = 0): QWord;
function TryDecimals2Int64Def(const a: array of char; aDefault: Int64 = 0): Int64;
function TryDecStr2Int(const s: string; out aValue: LongWord): Boolean; inline;
function TryDecStr2Int(const s: string; out aValue: LongInt): Boolean; inline;
function TryDecStr2Int(const s: string; out aValue: QWord): Boolean; inline;
function TryDecStr2Int(const s: string; out aValue: Int64): Boolean; inline;
function TryDecStr2DWordDef(const s: string; aDefault: DWord = 0): DWord; inline;
function TryDecStr2IntDef(const s: string; aDefault: LongInt = 0): LongInt; inline;
function TryDecStr2QWordDef(const s: string; aDefault: QWord = 0): QWord; inline;
function TryDecStr2Int64Def(const s: string; aDefault: Int64 = 0): Int64; inline;
{ some support for digit group separators, only for strings in decimal notation;
aSep is a separator for groups of digits(for example an underscore or an apostrophe);
a separator can not be less than #32;
the string cannot start with a separator;
leading spaces and tabs are allowed;
leading zeros are allowed;
a minus sign is not allowed for unsigned integers;
numerical value MUST fit into the range of the type of aValue;
if the TryD...2Int() returns False, then aValue is undefined }
function TryDgsChars2Int(const a: array of char; aSep: char; out aValue: LongWord): Boolean;
function TryDgsChars2Int(const a: array of char; aSep: char; out aValue: LongInt): Boolean;
function TryDgsChars2Int(const a: array of char; aSep: char; out aValue: QWord): Boolean;
function TryDgsChars2Int(const a: array of char; aSep: char; out aValue: Int64): Boolean;
function TryDgsChars2DWordDef(const a: array of char; aSep: char; aDefault: DWord = 0): DWord;
function TryDgsChars2IntDef(const a: array of char; aSep: char; aDefault: LongInt = 0): LongInt;
function TryDgsChars2QWordDef(const a: array of char; aSep: char; aDefault: QWord = 0): QWord;
function TryDgsChars2Int64Def(const a: array of char; aSep: char; aDefault: Int64 = 0): Int64;
function TryDgsStr2Int(const s: string; aSep: char; out aValue: LongWord): Boolean; inline;
function TryDgsStr2Int(const s: string; aSep: char; out aValue: LongInt): Boolean; inline;
function TryDgsStr2Int(const s: string; aSep: char; out aValue: QWord): Boolean; inline;
function TryDgsStr2Int(const s: string; aSep: char; out aValue: Int64): Boolean; inline;
function TryDgsStr2DWordDef(const s: string; aSep: char; aDefault: DWord = 0): DWord; inline;
function TryDgsStr2IntDef(const s: string; aSep: char; aDefault: LongInt = 0): LongInt; inline;
function TryDgsStr2QWordDef(const s: string; aSep: char; aDefault: QWord = 0): QWord; inline;
function TryDgsStr2Int64Def(const s: string; aSep: char; aDefault: Int64 = 0): Int64; inline;
{ some support for unicodestring }
function TryChars2Int(const a: array of widechar; out aValue: LongWord): Boolean;
function TryChars2Int(const a: array of widechar; out aValue: LongInt): Boolean;
function TryChars2Int(const a: array of widechar; out aValue: QWord): Boolean;
function TryChars2Int(const a: array of widechar; out aValue: Int64): Boolean;
function TryChars2DWordDef(const a: array of widechar; aDefault: DWord = 0): DWord;
function TryChars2IntDef(const a: array of widechar; aDefault: LongInt = 0): LongInt;
function TryChars2QWordDef(const a: array of widechar; aDefault: QWord = 0): QWord;
function TryChars2Int64Def(const a: array of widechar; aDefault: Int64 = 0): Int64;
function TryStr2Int(const s: unicodestring; out aValue: LongWord): Boolean; inline;
function TryStr2Int(const s: unicodestring; out aValue: LongInt): Boolean; inline;
function TryStr2Int(const s: unicodestring; out aValue: QWord): Boolean; inline;
function TryStr2Int(const s: unicodestring; out aValue: Int64): Boolean; inline;
function TryStr2DWordDef(const s: unicodestring; aDefault: DWord = 0): DWord; inline;
function TryStr2IntDef(const s: unicodestring; aDefault: LongInt = 0): LongInt; inline;
function TryStr2QWordDef(const s: unicodestring; aDefault: QWord = 0): QWord; inline;
function TryStr2Int64Def(const s: unicodestring; aDefault: Int64 = 0): Int64; inline;
implementation
{$Q-}{$B-}{$R-}{$J-}{$COPERATORS ON}{$POINTERMATH ON}
const
Table: array[#0..#255] of Byte = (
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$00, $01, $02, $03, $04, $05, $06, $07, $08, $09, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $0a, $0b, $0c, $0d, $0e, $0f, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $0a, $0b, $0c, $0d, $0e, $0f, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff,
$ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff);
type
TInt = (int8, int16);
TRadix = (rxBin, rxOct, rxDec, rxHex);
const
Bases: array[TRadix] of DWord = (2, 8, 10, 16);
UIntMax: array[TInt] of DWord = (High(Byte), High(Word));
SIntMax: array[TInt] of DWord = (High(ShortInt), High(SmallInt));
UIntMaxLen: array[TInt, TRadix] of SizeInt = ((8, 3, 3, 2), (16, 6, 5, 4));
Int32MaxLen: array[TRadix] of SizeInt = (32, 11, 10, 8);
{$IFNDEF CPU64}
Int32PrevMax: array[TRadix] of DWord = (0, 536870911, 429496729, 0);
{$ENDIF}
Int64MaxLen: array[TRadix] of SizeInt = (64, 22, 20, 16);
Int64PrevMax: array[TRadix] of QWord = (0, 2305843009213693951, 1844674407370955161, 0);
function Base2UInt(p: PChar; aCount: SizeInt; aType: TInt; aRadix: TRadix; out aValue: DWord): Boolean;
var
Base, v, t: DWord;
pEnd: PChar;
begin
if aCount < 1 then exit(False);
while p^ = '0' do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then
begin
aValue := 0;
exit(True);
end;
end;
if aCount > UIntMaxLen[aType, aRadix] then exit(False);
Base := Bases[aRadix];
v := Table[p^];
if v >= Base then exit(False);
pEnd := p + aCount;
Inc(p);
while p < pEnd do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end;
if v > UIntMax[aType] then exit(False);
aValue := v;
Result := True;
end;
{$MACRO ON}
{$DEFINE MainCaseMacro :=
case p^ of
'$': Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxHex, OutMacro);
'%': Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxBin, OutMacro);
'&': Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxOct, OutMacro);
'0':
begin
if aCount = 1 then
begin
aValue := 0;
exit(True);
end;
{$IFDEF NEED_VAL_COMPAT}
case p[1] of
'0'..'9':
begin
SetDecTrueMacro
Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxDec, OutMacro);
end;
'X', 'x': Result := ConvFunMacro(p+2, aCount-2, TypeMacro rxHex, OutMacro);
end;
{$ELSE }
case p[1] of
'0'..'9': Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxOct, OutMacro);
'B', 'b': Result := ConvFunMacro(p+2, aCount-2, TypeMacro rxBin, OutMacro);
'O', 'o': Result := ConvFunMacro(p+2, aCount-2, TypeMacro rxOct, OutMacro);
'X', 'x': Result := ConvFunMacro(p+2, aCount-2, TypeMacro rxHex, OutMacro);
end;
{$ENDIF NEED_VAL_COMPAT}
end;
'1'..'9':
begin
SetDecTrueMacro
Result := ConvFunMacro(p, aCount, TypeMacro rxDec, OutMacro);
end;
'X', 'x': Result := ConvFunMacro(p+1, aCount-1, TypeMacro rxHex, OutMacro)
end;
}
function BaseParseUInt(p: PChar; aCount: SizeInt; aType: TInt; out aValue: DWord): Boolean;
begin
Result := False;
//here assumed aCount > 0
while p^ in [#9, ' '] do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
if p^ = '+' then
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
{$DEFINE TypeMacro := aType,}{$DEFINE SetDecTrueMacro :=}
{$DEFINE ConvFunMacro := Base2UInt}{$DEFINE OutMacro := aValue}
MainCaseMacro;
end;
function BaseParseSInt(p: PChar; aCount: SizeInt; aType: TInt; out aValue: LongInt): Boolean;
var
v: DWord;
IsNeg, IsDec: Boolean;
begin
Result := False;
//here assumed aCount > 0
while p^ in [#9, ' '] do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
if p^ = '-' then
begin
IsNeg := True;
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end
else
begin
IsNeg := False;
if p^ = '+' then
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
end;
v := 0;
IsDec := False;
{$DEFINE TypeMacro := aType,}{$DEFINE SetDecTrueMacro := IsDec := True;}
{$DEFINE ConvFunMacro := Base2UInt}{$DEFINE OutMacro := v}
MainCaseMacro;
if not Result then exit;
if IsNeg then
begin
if v > Succ(SIntMax[aType]) then exit(False);
aValue := -LongInt(v);
end
else
begin
if IsDec and (v > SIntMax[aType]) then exit(False);
aValue := LongInt(v);
end;
end;
function PChar2UIntImpl(p: PChar; aCount: SizeInt; aRadix: TRadix; out aValue: DWord): Boolean;
var
{$IFDEF CPU64}
v: QWord;
Base, t: DWord;
{$ELSE}
Base, v, t: DWord;
{$ENDIF}
pEnd: PChar;
begin
if aCount < 1 then exit(False);
while p^ = '0' do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then
begin
aValue := 0;
exit(True);
end;
end;
if aCount > Int32MaxLen[aRadix] then exit(False);
Base := Bases[aRadix];
v := Table[p^];
if v >= Base then exit(False);
pEnd := p + aCount;
Inc(p);
{$IFDEF CPU64}
while p < pEnd do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end;
if v > High(DWord) then exit(False);
{$ELSE}
if (aCount < Int32MaxLen[aRadix]) or (aRadix in [rxBin, rxHex]) then
while p < pEnd do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end
else
begin
while p < pEnd - 1 do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end;
if v > Int32PrevMax[aRadix] then exit(False);
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
if v < t then exit(False);
end;
{$ENDIF}
aValue := v;
Result := True;
end;
{$PUSH}{$WARN 4079 OFF}
function PChar2UIntImpl(p: PChar; aCount: SizeInt; aRadix: TRadix; out aValue: QWord): Boolean;
var
v: QWord;
Base, t: DWord;
pEnd: PChar;
{$IFNDEF CPU64}
pDw: PChar;
{$ENDIF}
begin
if aCount < 1 then exit(False);
while p^ = '0' do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then
begin
aValue := 0;
exit(True);
end;
end;
if aCount > Int64MaxLen[aRadix] then exit(False);
Base := Bases[aRadix];
v := Table[p^];
if v >= Base then exit(False);
pEnd := p + aCount;
{$IFNDEF CPU64}
pDw := p + Pred(Int32MaxLen[aRadix]);
{$ENDIF}
Inc(p);
{$IFDEF CPU64}
if (aCount < Int64MaxLen[aRadix]) or (aRadix in [rxBin, rxHex]) then
while p < pEnd do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end
else
begin
while p < pEnd - 1 do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end;
if v > Int64PrevMax[aRadix] then exit(False);
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
if v < t then exit(False);
end;
{$ELSE}
if (aCount < Int64MaxLen[aRadix]) or (aRadix in [rxBin, rxHex]) then
while p < pEnd do
begin
t := Table[p^];
if t >= Base then exit(False);
if p < pDw then
v := DWord(v) * Base + t
else
v := v * Base + t;
Inc(p);
end
else
begin
while p < pDw do
begin
t := Table[p^];
if t >= Base then exit(False);
v := DWord(v) * Base + t;
Inc(p);
end;
while p < pEnd - 1 do
begin
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
Inc(p);
end;
if v > Int64PrevMax[aRadix] then exit(False);
t := Table[p^];
if t >= Base then exit(False);
v := v * Base + t;
if v < t then exit(False);
end;
{$ENDIF}
aValue := v;
Result := True;
end;
{$POP}
generic function PChar2UInt<T>(p: PChar; aCount: SizeInt; out aValue: T): Boolean;
begin
Result := False;
//here assumed aCount > 0
while p^ in [#9, ' '] do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
if p^ = '+' then
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
{$DEFINE TypeMacro :=}{$DEFINE SetDecTrueMacro :=}
{$DEFINE ConvFunMacro := PChar2UIntImpl}{$DEFINE OutMacro := aValue}
MainCaseMacro;
end;
generic function PChar2SInt<TUInt, TSint>(p: PChar; aCount: SizeInt; out aValue: TSint): Boolean;
var
v: TUInt;
IsNeg, IsDec: Boolean;
begin
Result := False;
//here assumed aCount > 0
while p^ in [#9, ' '] do
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
if p^ = '-' then
begin
IsNeg := True;
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end
else
begin
IsNeg := False;
if p^ = '+' then
begin
Inc(p);
Dec(aCount);
if aCount = 0 then exit;
end;
end;
v := 0;
IsDec := False;
{$DEFINE TypeMacro :=}{$DEFINE SetDecTrueMacro := IsDec := True;}
{$DEFINE ConvFunMacro := PChar2UIntImpl}{$DEFINE OutMacro := v}
MainCaseMacro;
if Result then
if IsNeg then
begin
if v > Succ(TUInt(High(TSint))) then exit(False);
aValue := -TSint(v);
end
else
begin
if IsDec and (v > TUInt(High(TSint))) then exit(False);
aValue := TSint(v);
end;
end;
{$MACRO OFF}
function TryChars2Int(const a: array of char; out aValue: Byte): Boolean;
var
v: DWord;
begin
if (Length(a) = 0) or not BaseParseUInt(@a[0], Length(a), int8, v) then exit(False);
aValue := v;
Result := True;
end;
function TryChars2Int(const a: array of char; out aValue: ShortInt): Boolean;
var
v: LongInt;
begin
if (Length(a) = 0) or not BaseParseSInt(@a[0], Length(a), int8, v) then exit(False);
aValue := v;
Result := True;
end;
function TryChars2Int(const a: array of char; out aValue: Word): Boolean;
var
v: DWord;
begin
if (Length(a) = 0) or not BaseParseUInt(@a[0], Length(a), int16, v) then exit(False);
aValue := v;
Result := True;
end;
function TryChars2Int(const a: array of char; out aValue: SmallInt): Boolean;
var
v: LongInt;
begin
if (Length(a) = 0) or not BaseParseSInt(@a[0], Length(a), int16, v) then exit(False);
aValue := v;
Result := True;
end;
function TryChars2Int(const a: array of char; out aValue: LongWord): Boolean;
begin
if Length(a) = 0 then exit(False);
Result := specialize PChar2UInt<DWord>(@a[0], Length(a), aValue);
end;
function TryChars2Int(const a: array of char; out aValue: LongInt): Boolean;
begin
if Length(a) = 0 then exit(False);
Result := specialize PChar2SInt<DWord, LongInt>(@a[0], Length(a), aValue);
end;
function TryChars2Int(const a: array of char; out aValue: QWord): Boolean;
begin
if Length(a) = 0 then exit(False);
Result := specialize PChar2UInt<QWord>(@a[0], Length(a), aValue);
end;
function TryChars2Int(const a: array of char; out aValue: Int64): Boolean;
begin
if Length(a) = 0 then exit(False);
Result := specialize PChar2SInt<QWord, Int64>(@a[0], Length(a), aValue);
end;
function TryChars2ByteDef(const a: array of char; aDefault: Byte): Byte;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2ShortIntDef(const a: array of char; aDefault: ShortInt): ShortInt;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2WordDef(const a: array of char; aDefault: Word): Word;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2SmallIntDef(const a: array of char; aDefault: SmallInt): SmallInt;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2DWordDef(const a: array of char; aDefault: DWord): DWord;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2IntDef(const a: array of char; aDefault: LongInt): LongInt;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2QWordDef(const a: array of char; aDefault: QWord): QWord;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryChars2Int64Def(const a: array of char; aDefault: Int64): Int64;
begin
if not TryChars2Int(a, Result) then
Result := aDefault;
end;
function TryStr2Int(const s: string; out aValue: Byte): Boolean;
begin
Result := TryChars2Int(s[1..System.Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: ShortInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: Word): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: SmallInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: LongWord): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: LongInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: QWord): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2Int(const s: string; out aValue: Int64): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TryStr2ByteDef(const s: string; aDefault: Byte): Byte;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2ShortIntDef(const s: string; aDefault: ShortInt): ShortInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2WordDef(const s: string; aDefault: Word): Word;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2SmallIntDef(const s: string; aDefault: SmallInt): SmallInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2DWordDef(const s: string; aDefault: DWord): DWord;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2IntDef(const s: string; aDefault: LongInt): LongInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2QWordDef(const s: string; aDefault: QWord): QWord;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2Int64Def(const s: string; aDefault: Int64): Int64;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2Int(const s: shortstring; out aValue: Byte): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: ShortInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: Word): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: SmallInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: LongWord): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: LongInt): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: QWord): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2Int(const s: shortstring; out aValue: Int64): Boolean;
begin
Result := TryChars2Int(s[1..Length(s)], aValue);
end;
function TrySStr2ByteDef(const s: shortstring; aDefault: Byte): Byte;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2ShortIntDef(const s: shortstring; aDefault: ShortInt): ShortInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2WordDef(const s: shortstring; aDefault: Word): Word;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2SmallIntDef(const s: shortstring; aDefault: SmallInt): SmallInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2DWordDef(const s: shortstring; aDefault: DWord): DWord;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2IntDef(const s: shortstring; aDefault: LongInt): LongInt;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2QWordDef(const s: shortstring; aDefault: QWord): QWord;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TrySStr2Int64Def(const s: shortstring; aDefault: Int64): Int64;
begin
if not TryChars2Int(s[1..Length(s)], Result) then
Result := aDefault;
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Byte): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: ShortInt): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Word): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: SmallInt): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: LongWord): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: LongInt): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: QWord): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2Int(p: PChar; aCount: SizeInt; out aValue: Int64): Boolean;
begin
Result := TryChars2Int(p[0..Pred(aCount)], aValue);
end;
function TryStr2ByteDef(p: PChar; aCount: SizeInt; aDefault: Byte): Byte;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2ShortIntDef(p: PChar; aCount: SizeInt; aDefault: ShortInt): ShortInt;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2WordDef(p: PChar; aCount: SizeInt; aDefault: Word): Word;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2SmallIntDef(p: PChar; aCount: SizeInt; aDefault: SmallInt): SmallInt;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2DWordDef(p: PChar; aCount: SizeInt; aDefault: DWord): DWord;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2IntDef(p: PChar; aCount: SizeInt; aDefault: LongInt): LongInt;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2QWordDef(p: PChar; aCount: SizeInt; aDefault: QWord): QWord;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
function TryStr2Int64Def(p: PChar; aCount: SizeInt; aDefault: Int64): Int64;
begin
if not TryChars2Int(p[0..Pred(aCount)], Result) then
Result := aDefault;
end;
{$PUSH}{$WARN 4079 OFF}
function Decimals2UInt(p, pEnd: PChar; out aValue: DWord): Boolean;
var
v, t, Count: DWord;
begin
//here assumed p < pEnd and p^ not in [#9, ' ', '-', '+']
while p^ = '0' do
begin
Inc(p);
if p = pEnd then
begin
aValue := 0;
exit(True);
end;
end;
Count := pEnd - p;
if Count > 10 then exit(False);
v := 0;
{$IFDEF FPC_REQUIRES_PROPER_ALIGNMENT}
{$PUSH}{$WARN 4055 OFF}
if SizeUInt(p) and 3 = 0 then
{$POP}
{$ENDIF FPC_REQUIRES_PROPER_ALIGNMENT}
while p + 4 < pEnd do
begin
t := PDWord(p)^;
{$IFDEF ENDIAN_BIG}SwapEndian(t);{$ENDIF ENDIAN_BIG}
if t and DWord($F0F0F0F0) <> DWord($30303030) then exit(False);