{
    *********************************************************************
    Copyright (C) 1997, 1998 Gertjan Schouten

    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., 675 Mass Ave, Cambridge, MA 02139, USA.
    *********************************************************************

    System Utilities For Free Pascal
}

{==============================================================================}
{   standard functions                                                         }
{==============================================================================}

type
   PString = ^String;

   { For FloatToText }
   TFloatFormat = (ffGeneral, ffExponent, ffFixed, ffNumber, ffCurrency);
   TFloatValue = (fvExtended, fvCurrency, fvSingle, fvReal, fvDouble, fvComp);
   TReplaceFlags = set of (rfReplaceAll, rfIgnoreCase);

   TFloatRec = Record
      Exponent: Integer;
      Negative: Boolean;
      Digits: Array[0..18] Of Char;
   End;

const
  { For floattodatetime and VariantToDate }
{$ifndef FPUNONE}
  MinDateTime: TDateTime =  -693593.0;     { 01/01/0001 12:00:00.000 AM }
  MaxDateTime: TDateTime =  2958465.99999; { 12/31/9999 11:59:59.999 PM }

{$if defined(FPC_HAS_TYPE_EXTENDED) or defined(FPC_HAS_TYPE_FLOAT128)}
  MinCurrency: Currency = -922337203685477.5807;
  MaxCurrency: Currency =  922337203685477.5807;
{$else}
  MinCurrency: Currency = -922337203685477.0000;
  MaxCurrency: Currency =  922337203685477.0000;
{$endif}
{$else}
  MinCurrency: Currency = -9223372036854775807;
  MaxCurrency: Currency =  9223372036854775807;
{$endif}

Const
  LeadBytes: set of Char = [];
  EmptyStr : string = '';
  NullStr : PString = @EmptyStr;

  EmptyWideStr : WideString = '';
//  NullWideStr : PWideString = @EmptyWideStr;

Var TrueBoolStrs,
    FalseBoolStrs : Array of String;

// declaring this breaks delphi compatibility and e.g. tw3721.pp
// function NewStr(Const S: ShortString): PShortString; overload;
function NewStr(const S: string): PString; overload;
procedure DisposeStr(S: PString); overload;
procedure DisposeStr(S: PShortString); overload;
procedure AssignStr(var P: PString; const S: string);
procedure AppendStr(var Dest: String; const S: string);
function UpperCase(const s: string): string;
function LowerCase(const s: string): string; overload;
{ the compiler can't decide else if it should use the char or the ansistring
  version for a variant }
function LowerCase(const V: variant): string; overload;{$ifdef SYSUTILSINLINE}inline;{$endif}
function CompareStr(const S1, S2: string): Integer; overload;
function CompareMemRange(P1, P2: Pointer; Length: PtrUInt): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function CompareMem(P1, P2: Pointer; Length: PtrUInt): Boolean;{$ifdef SYSUTILSINLINE}inline;{$endif}
function CompareText(const S1, S2: string): integer;
function SameText(const s1,s2:String):Boolean;

function AnsiUpperCase(const s: string): string;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiLowerCase(const s: string): string;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiCompareStr(const S1, S2: string): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiCompareText(const S1, S2: string): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiSameText(const s1,s2:String):Boolean;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiSameStr(const s1,s2:String):Boolean;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrComp(S1, S2: PChar): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrIComp(S1, S2: PChar): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrLComp(S1, S2: PChar; MaxLen: cardinal): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrLIComp(S1, S2: PChar; MaxLen: cardinal): integer;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrLower(Str: PChar): PChar;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiStrUpper(Str: PChar): PChar;{$ifdef SYSUTILSINLINE}inline;{$endif}
function AnsiLastChar(const S: string): PChar;
function AnsiStrLastChar(Str: PChar): PChar;

function Trim(const S: string): string;
function TrimLeft(const S: string): string;
function TrimRight(const S: string): string;
function QuotedStr(const S: string): string;
function AnsiQuotedStr(const S: string; Quote: char): string;
function AnsiDequotedStr(const S: string; AQuote: Char): string;
function AnsiExtractQuotedStr(var Src: PChar; Quote: Char): string;
function AdjustLineBreaks(const S: string): string;
function AdjustLineBreaks(const S: string; Style: TTextLineBreakStyle): string;
function IsValidIdent(const Ident: string): boolean;
function IntToStr(Value: integer): string;
function IntToStr(Value: Int64): string;
function IntToStr(Value: QWord): string;
function IntToHex(Value: integer; Digits: integer): string;
function IntToHex(Value: Int64; Digits: integer): string;
function IntToHex(Value: QWord; Digits: integer): string;
function StrToInt(const s: string): integer;
function TryStrToInt(const s: string; Out i : integer) : boolean;
function StrToInt64(const s: string): int64;
function TryStrToInt64(const s: string; Out i : int64) : boolean;
function StrToQWord(const s: string): QWord;
function TryStrToQWord(const s: string; Out Q : QWord) : boolean;
function StrToIntDef(const S: string; Default: integer): integer;
function StrToInt64Def(const S: string; Default: int64): int64;
function StrToQWordDef(const S: string; Default: QWord): QWord;
function LoadStr(Ident: integer): string;
// function FmtLoadStr(Ident: integer; const Args: array of const): string;
Function Format (Const Fmt : String; const Args : Array of const) : String;
Function Format (Const Fmt: string; const Args: array of const; const FormatSettings: TFormatSettings): string;
Function FormatBuf (Var Buffer; BufLen : Cardinal; Const Fmt; fmtLen : Cardinal; Const Args : Array of const) : Cardinal;
Function FormatBuf (Var Buffer; BufLen : Cardinal; Const Fmt; fmtLen : Cardinal; Const Args : Array of const; Const FormatSettings: TFormatSettings) : Cardinal;
Function StrFmt(Buffer,Fmt : PChar; Const args: Array of const) : Pchar;
Function StrFmt(Buffer,Fmt : PChar; Const Args: Array of const; Const FormatSettings: TFormatSettings): PChar;
Function StrLFmt(Buffer : PCHar; Maxlen : Cardinal;Fmt : PChar; Const args: Array of const) : Pchar;
Function StrLFmt(Buffer : PCHar; Maxlen : Cardinal;Fmt : PChar; Const args: Array of const; Const FormatSettings: TFormatSettings) : Pchar;
Procedure FmtStr(Var Res: String; Const Fmt : String; Const args: Array of const);
Procedure FmtStr(Var Res: string; const Fmt : string; Const args: Array of const; Const FormatSettings: TFormatSettings);
{$ifndef FPUNONE}
{$ifdef FPC_HAS_TYPE_EXTENDED}
Function FloatToStrF(Value: Extended; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Extended; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
{$endif FPC_HAS_TYPE_EXTENDED}
Function FloatToStrF(Value: Double; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Double; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
Function FloatToStrF(Value: Single; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Single; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
Function FloatToStrF(Value: Comp; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Comp; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
Function FloatToStrF(Value: Currency; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Currency; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
{$ifndef FPC_COMP_IS_INT64}
Function FloatToStrF(Value: Int64; format: TFloatFormat; Precision, Digits: Integer): String;
Function FloatToStrF(Value: Int64; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): String;
{$endif FPC_COMP_IS_INT64}
Function CurrToStrF(Value: Currency; Format: TFloatFormat; Digits: Integer): string;
Function CurrToStrF(Value: Currency; Format: TFloatFormat; Digits: Integer; Const FormatSettings: TFormatSettings): string;
{$ifdef FPC_HAS_TYPE_EXTENDED}
Function FloatToStr(Value: Extended): String;
Function FloatToStr(Value: Extended; Const FormatSettings: TFormatSettings): String;
{$endif FPC_HAS_TYPE_EXTENDED}
Function FloatToStr(Value: Double): String;
Function FloatToStr(Value: Double; Const FormatSettings: TFormatSettings): String;
Function FloatToStr(Value: Single): String;
Function FloatToStr(Value: Single; Const FormatSettings: TFormatSettings): String;
Function FloatToStr(Value: Currency): String;
Function FloatToStr(Value: Currency; Const FormatSettings: TFormatSettings): String;
Function FloatToStr(Value: Comp): String;
Function FloatToStr(Value: Comp; Const FormatSettings: TFormatSettings): String;
{$ifndef FPC_COMP_IS_INT64}
Function FloatToStr(Value: Int64): String;
Function FloatToStr(Value: Int64; Const FormatSettings: TFormatSettings): String;
{$endif FPC_COMP_IS_INT64}
Function StrToFloat(Const S : String) : Extended;
Function StrToFloat(Const S : String; Const FormatSettings: TFormatSettings) : Extended;
Function StrToFloatDef(Const S: String; Const Default: Extended): Extended;
Function StrToFloatDef(Const S: String; Const Default: Extended; Const FormatSettings: TFormatSettings): Extended;
Function TryStrToFloat(Const S : String; Out Value: Single): Boolean;
Function TryStrToFloat(Const S : String; Out Value: Single; Const FormatSettings: TFormatSettings): Boolean;
Function TryStrToFloat(Const S : String; Out Value: Double): Boolean;
Function TryStrToFloat(Const S : String; Out Value: Double; Const FormatSettings: TFormatSettings): Boolean;
{$ifdef FPC_HAS_TYPE_EXTENDED}
Function TryStrToFloat(Const S : String; Out Value: Extended): Boolean;
Function TryStrToFloat(Const S : String; Out Value: Extended; Const FormatSettings: TFormatSettings): Boolean;
{$endif FPC_HAS_TYPE_EXTENDED}
Function TextToFloat(Buffer: PChar; Out Value: Extended): Boolean;
Function TextToFloat(Buffer: PChar; Out Value: Extended; Const FormatSettings: TFormatSettings): Boolean;
Function TextToFloat(Buffer: PChar; Out Value; ValueType: TFloatValue): Boolean;
Function TextToFloat(Buffer: PChar; Out Value; ValueType: TFloatValue; Const FormatSettings: TFormatSettings): Boolean;
Function FloatToText(Buffer: PChar; Value: Extended; format: TFloatFormat; Precision, Digits: Integer): Longint;
Function FloatToText(Buffer: PChar; Value: Extended; format: TFloatFormat; Precision, Digits: Integer; Const FormatSettings: TFormatSettings): Longint;
Function FloatToDateTime (Const Value : Extended) : TDateTime;
Function FloattoCurr (Const Value : Extended) : Currency;
function TryFloatToCurr(const Value: Extended; var AResult: Currency): Boolean;

Function CurrToStr(Value: Currency): string;
Function CurrToStr(Value: Currency; Const FormatSettings: TFormatSettings): string;
function StrToCurr(const S: string): Currency;
function StrToCurr(const S: string; Const FormatSettings: TFormatSettings): Currency;  
function TryStrToCurr(const S: string;Out Value : Currency): Boolean;
function TryStrToCurr(const S: string;Out Value : Currency; Const FormatSettings: TFormatSettings): Boolean;       
function StrToCurrDef(const S: string; Default : Currency): Currency;
function StrToCurrDef(const S: string; Default : Currency; Const FormatSettings: TFormatSettings): Currency;  

Function FloatToTextFmt(Buffer: PChar; Value: Extended; format: PChar; FormatSettings : TFormatSettings): Integer;
Function FloatToTextFmt(Buffer: PChar; Value: Extended; format: PChar): Integer;
Procedure FloatToDecimal(Out Result: TFloatRec; const Value; ValueType: TFloatValue; Precision, Decimals : integer);
Procedure FloatToDecimal(Out Result: TFloatRec; Value: Extended; Precision, Decimals : integer);
Function FormatFloat(Const Format : String; Value : Extended) : String;
Function FormatFloat(Const Format : String; Value : Extended; Const FormatSettings: TFormatSettings) : String;

function FormatCurr(const Format: string; Value: Currency): string;
Function FormatCurr(const Format: string; Value: Currency; Const FormatSettings: TFormatSettings): string;
{$endif}

function StrToBool(const S: string): Boolean;
function BoolToStr(B: Boolean;UseBoolStrs:Boolean=False): string;
function BoolToStr(B: Boolean;const TrueS,FalseS:string): string; inline;
function StrToBoolDef(const S: string; Default: Boolean): Boolean;
function TryStrToBool(const S: string; out Value: Boolean): Boolean;

function LastDelimiter(const Delimiters, S: string): Integer;
function StringReplace(const S, OldPattern, NewPattern: string;  Flags: TReplaceFlags): string;
Function IsDelimiter(const Delimiters, S: string; Index: Integer): Boolean;

function SScanf(const s: string; const fmt : string;const Pointers : array of Pointer) : Integer;

{// MBCS Functions. No MBCS yet, so mostly these are calls to the regular counterparts.}
Type
  TMbcsByteType = (mbSingleByte, mbLeadByte, mbTrailByte);

Function ByteType(const S: string; Index: Integer): TMbcsByteType;
Function StrByteType(Str: PChar; Index: Cardinal): TMbcsByteType;
Function ByteToCharLen(const S: string; MaxLen: Integer): Integer;
Function CharToByteLen(const S: string; MaxLen: Integer): Integer;
Function ByteToCharIndex(const S: string; Index: Integer): Integer;
Function StrCharLength(const Str: PChar): Integer;
function StrNextChar(const Str: PChar): PChar;


const
{$ifndef unix}
  SwitchChars = ['/','-'];
{$else}
  SwitchChars = ['-'];
{$endif}

Type
  TSysCharSet = Set of char;
  PSysCharSet = ^TSysCharSet;

Function FindCmdLineSwitch(const Switch: string; const Chars: TSysCharSet;IgnoreCase: Boolean): Boolean;
Function FindCmdLineSwitch(const Switch: string; IgnoreCase: Boolean): Boolean;
Function FindCmdLineSwitch(const Switch: string): Boolean;

function WrapText(const Line, BreakStr: string; const BreakChars: TSysCharSet;  MaxCol: Integer): string;
function WrapText(const Line: string; MaxCol: Integer): string;


{==============================================================================}
{   extra functions                                                            }
{==============================================================================}

function LeftStr(const S: string; Count: integer): string;
function RightStr(const S: string; Count: integer): string;
function BCDToInt(Value: integer): integer;