mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-11-04 14:39:36 +01:00
533 lines
12 KiB
ObjectPascal
533 lines
12 KiB
ObjectPascal
{
|
|
This file is part of the Free Pascal run time library.
|
|
Copyright (c) 1999-2000 by Michael Van Canneyt,
|
|
member of the Free Pascal development team
|
|
|
|
See the file COPYING.FPC, included in this distribution,
|
|
for details about the copyright.
|
|
|
|
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.
|
|
|
|
**********************************************************************}
|
|
{
|
|
This file contains the implementation of the LongString type,
|
|
and all things that are needed for it.
|
|
LongSTring is defined as a 'silent' pansichar :
|
|
a pansichar that points to :
|
|
|
|
@ : Longint for size
|
|
@+4 : Unused byte;
|
|
@+5 : AnsiString;
|
|
So LS[i] is converted to the address @LS+4+i.
|
|
|
|
pansichar[0]-pansichar[3] : Longint Size
|
|
pansichar [4] : Unused
|
|
pansichar[5] : AnsiString;
|
|
|
|
}
|
|
|
|
{$ifdef lstrings_unit}
|
|
{ Compile as a separate unit - development only}
|
|
{$IFNDEF FPC_DOTTEDUNITS}
|
|
unit lstrings;
|
|
{$ENDIF FPC_DOTTEDUNITS}
|
|
|
|
Interface
|
|
|
|
Type longstring = pansichar;
|
|
ShortString = string;
|
|
|
|
{ Internal functions, will not appear in systemh.inc }
|
|
|
|
Function NewLongString (Len : Longint) : LongString;
|
|
Procedure DisposeLongString (Var S : LongString; Len : Longint);
|
|
Procedure Long_String_Concat (Var S1 : LongString; Const S2 : LongString; maxlen : Longint);
|
|
Procedure Long_ShortString_Concat (Var S1: LongString; Const S2 : ShortString; maxlen : Longint);
|
|
Procedure Long_To_ShortString (Var S1 : ShortString; Const S2 : LongString; Maxlen : Longint);
|
|
Procedure Short_To_LongString (Var S1 : LongString; Const S2 : ShortString; Maxlen : Longint);
|
|
Function LongCompare (Const S1,S2 : Longstring): Longint;
|
|
Function LongCompare (Const S1 : LongString; Const S2 : ShortString): Longint;
|
|
|
|
{ Public functions, Will end up in systemh.inc }
|
|
|
|
Procedure SetLength (Var S : LongString; l : Longint);
|
|
Procedure Write_Text_LongString (Len : Longint; T : Textrec; Var S : LongString);
|
|
Function Length (Const S : LongString) : Longint;
|
|
Function Copy (Const S : LongString; Index,Size : Longint) : LongString;
|
|
Function Pos (Const Substr : LongString; Const Source : Longstring) : Longint;
|
|
Procedure Insert (Const Source : LongString; Var S : LongString; Index : Longint);
|
|
Procedure Delete (Var S : LongString; Index,Size: Longint);
|
|
Procedure Val (Const S : LongString; var R : real; Var Code : Integer);
|
|
{Procedure Val (Const S : LongString; var D : Double; Var Code : Integer);}
|
|
Procedure Val (Const S : LongString; var E : Extended; Code : Integer);
|
|
Procedure Val (Const S : LongString; var C : Cardinal; Code : Integer);
|
|
Procedure Val (Const S : LongString; var L : Longint; Var Code : Integer);
|
|
Procedure Val (Const S : LongString; var W : Word; Var Code : Integer);
|
|
Procedure Val (Const S : LongString; var I : Integer; Var Code : Integer);
|
|
Procedure Val (Const S : LongString; var B : Byte; Var Code : Integer);
|
|
Procedure Val (Const S : LongString; var SI : ShortInt; Var Code : Integer);
|
|
Procedure Str (Const R : Real;Len, fr : longint; Var S : LongString);
|
|
{Procedure Str (Const D : Double;Len,fr : longint; Var S : LongString);}
|
|
Procedure Str (Const E : Extended;Len,fr : longint; Var S : LongString);
|
|
Procedure Str (Const C : Cardinal;len : Longint; Var S : LongString);
|
|
Procedure Str (Const L : LongInt;len : longint; Var S : LongString);
|
|
Procedure Str (Const W : Word;len : longint; Var S : LongString);
|
|
Procedure Str (Const I : Integer;len : Longint; Var S : LongString);
|
|
Procedure Str (Const B : Byte; Len : longint; Var S : LongString);
|
|
Procedure Str (Const SI : ShortInt; Len : longint; Var S : LongString);
|
|
|
|
Implementation
|
|
|
|
{$endif}
|
|
|
|
Type PLongint = ^Longint;
|
|
|
|
{ ---------------------------------------------------------------------
|
|
Internal functions, not in interface.
|
|
---------------------------------------------------------------------}
|
|
|
|
Function NewLongString (Len : Longint) : LongString;
|
|
{
|
|
Allocate a new string on the heap.
|
|
initialize it to zero length
|
|
}
|
|
Var P : Pointer;
|
|
|
|
begin
|
|
GetMem(P,Len+5);
|
|
If P<>Nil then
|
|
begin
|
|
PLongint(P)^:=0;
|
|
pansichar(P+4)^:=#0;
|
|
end;
|
|
NewLongString:=P;
|
|
end;
|
|
|
|
|
|
|
|
Procedure DisposeLongString (Var S : LongString; Len : Longint);
|
|
{
|
|
DeAllocates a LongString From the heap.
|
|
}
|
|
begin
|
|
FreeMem (Pointer(S),Len+5);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Long_String_Concat (Var S1 : LongString; Const S2 : LongString; maxlen : Longint);
|
|
{
|
|
Concatenates 2 LongStrings : S1+S2
|
|
If maxlen<>-1 then the result has maximal length maxlen.
|
|
}
|
|
Var Size : Longint;
|
|
|
|
begin
|
|
Size:=PLongint(S2)^;
|
|
If maxlen<>-1 then
|
|
if Size+PLongint(S1)^>MaxLen then
|
|
Size:=Maxlen-PLongint(S1)^;
|
|
If Size<=0 then exit;
|
|
Move (pansichar(S2)[5],ansipchar(S1)[PLongint(S1)^+5],Size);
|
|
PLongint(S1)^:=PLongint(S1)^+Size;
|
|
end;
|
|
|
|
|
|
|
|
Procedure Long_ShortString_Concat (Var S1: LongString; Const S2 : ShortString; maxlen : Longint);
|
|
{
|
|
Concatenates a long with a short string; : S2 + S2
|
|
If maxlen<>-1 then the result has maximal length maxlen.
|
|
}
|
|
Var Size : Longint;
|
|
|
|
begin
|
|
Size:=Byte(S2[0]);
|
|
if MaxLen<>-1 then
|
|
if Size+PLongint(S1)^>Maxlen then
|
|
Size:=Maxlen-PLongint(S1)^;
|
|
If Size<=0 then exit;
|
|
Move (S2[1],PAnsiChar(S1)[PLongint(S1)^+5],Size);
|
|
PLongint(S1)^:=PLongint(S1)^+Size;
|
|
end;
|
|
|
|
|
|
|
|
Procedure Long_To_ShortString (Var S1 : ShortString; Const S2 : LongString; Maxlen : Longint);
|
|
{
|
|
Converts a LongString to a longstring;
|
|
if maxlen<>-1, the resulting string has maximal length maxlen
|
|
else a default length of 255 is taken.
|
|
}
|
|
Var Size : Longint;
|
|
|
|
begin
|
|
Size:=PLongint(S2)^;
|
|
if maxlen=-1 then maxlen:=255;
|
|
If Size>maxlen then Size:=maxlen;
|
|
Move (PAnsiChar(S2)[5],S1[1],Size);
|
|
S1[0]:=chr(Size);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Short_To_LongString (Var S1 : LongString; Const S2 : ShortString; Maxlen : Longint);
|
|
{
|
|
Converts a ShortString to a LongString;
|
|
if maxlen<>-1 then the resulting string has length maxlen.
|
|
}
|
|
Var Size : Longint;
|
|
|
|
begin
|
|
Size:=Byte(S2[0]);
|
|
if maxlen=-1 then maxlen:=255;
|
|
If Size>maxlen then Size:=maxlen;
|
|
Move (S2[1],PAnsiChar(S1)[5],Size);
|
|
PLongint(S1)^:=Size;
|
|
end;
|
|
|
|
|
|
|
|
Function LongCompare (Const S1,S2 : Longstring): Longint;
|
|
{
|
|
Compares 2 longStrings;
|
|
The result is
|
|
<0 if S1<S2
|
|
0 if S1=S2
|
|
>0 if S1>S2
|
|
}
|
|
Var i,MaxI,Temp : Longint;
|
|
|
|
begin
|
|
Temp:=0;
|
|
i:=1;
|
|
MaxI:=PLongint(S1)^;
|
|
if MaxI>PLOngint(S2)^ then MaxI:=PLongint(S2)^;
|
|
While (i<=MaxI) and (Temp=0) do
|
|
begin
|
|
Temp:= Byte( PAnsiChar(S1)[i+4] ) - Byte( PAnsiChar(S2)[I+4] );
|
|
inc(i);
|
|
end;
|
|
if temp=0 then temp:=Plongint(S1)^-PLongint(S2)^;
|
|
LongCompare:=Temp;
|
|
end;
|
|
|
|
|
|
|
|
Function LongCompare (Const S1 : LongString; Const S2 : ShortString): Longint;
|
|
{
|
|
Compares a longString with a ShortString;
|
|
The result is
|
|
<0 if S1<S2
|
|
0 if S1=S2
|
|
>0 if S1>S2
|
|
}
|
|
Var i,MaxI,Temp : Longint;
|
|
|
|
begin
|
|
Temp:=0;
|
|
i:=1;
|
|
MaxI:=PLongint(S1)^;
|
|
if MaxI>byte(S2[0]) then MaxI:=Byte(S2[0]);
|
|
While (i<=MaxI) and (Temp=0) do
|
|
begin
|
|
Temp:=(Byte(PAnsiChar(S1)[i+4])-Byte(S2[I]));
|
|
inc(i);
|
|
end;
|
|
LongCompare:=Temp;
|
|
end;
|
|
|
|
|
|
|
|
Procedure Write_Text_LongString (Len : Longint; T : TextRec; Var S : LongString);
|
|
{
|
|
Writes a LongString to the Text file T
|
|
}
|
|
begin
|
|
end;
|
|
|
|
|
|
{ ---------------------------------------------------------------------
|
|
Public functions, In interface.
|
|
---------------------------------------------------------------------}
|
|
|
|
Function Length (Const S : LongString) : Longint;
|
|
|
|
begin
|
|
Length:=PLongint(S)^;
|
|
end;
|
|
|
|
|
|
|
|
Procedure SetLength (Var S : LongString; l : Longint);
|
|
|
|
begin
|
|
PLongint(S)^:=l;
|
|
end;
|
|
|
|
Function Copy (Const S : LongString; Index,Size : Longint) : LongString;
|
|
|
|
var ResultAddress : PAnsiChar;
|
|
|
|
begin
|
|
ResultAddress:=NewLongString (Size);
|
|
if ResultAddress=Nil then
|
|
{We're in deep shit here !!}
|
|
exit;
|
|
dec(index);
|
|
if PLongint(S)^<Index+Size then
|
|
Size:=PLongint(S)^-Index;
|
|
if Size>0 then
|
|
Move (PAnsiChar(S)[Index+5],ResultAddress[5],Size)
|
|
Else
|
|
Size:=0;
|
|
PLongint(ResultAddress)^:=Size;
|
|
Copy:=ResultAddress
|
|
end;
|
|
|
|
|
|
|
|
Function Pos (Const Substr : LongString; Const Source : Longstring) : Longint;
|
|
|
|
var i,j : longint;
|
|
e : boolean;
|
|
s : longstring;
|
|
|
|
begin
|
|
i := 0;
|
|
j := 0;
|
|
e := true;
|
|
if Plongint(substr)^=0 then e := false;
|
|
while (e) and (i <= length (Source) - length (substr)) do
|
|
begin
|
|
inc (i);
|
|
s :=copy(Source,i,length(Substr));
|
|
if LongCompare(substr,s)=0 then
|
|
begin
|
|
j := i;
|
|
e := false;
|
|
end;
|
|
DisposeLongString(s,length(Substr));
|
|
end;
|
|
pos := j;
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var R : real; Var Code : Integer);
|
|
|
|
Var SS : String;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,R,Code);
|
|
end;
|
|
|
|
|
|
{
|
|
Procedure Val (Const S : LongString; var D : Double; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
Val(SS,D,Code);
|
|
end;
|
|
}
|
|
|
|
|
|
Procedure Val (Const S : LongString; var E : Extended; Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,E,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var C : Cardinal; Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,C,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var L : Longint; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,L,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var W : Word; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,W,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var I : Integer; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,I,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var B : Byte; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,B,Code);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Val (Const S : LongString; var SI : ShortInt; Var Code : Integer);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
Long_To_ShortString (SS,S,255);
|
|
System.Val(SS,SI,Code);
|
|
end;
|
|
|
|
|
|
Procedure Str (Const R : Real;Len,fr : Longint; Var S : LongString);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
{int_Str_Real (R,Len,fr,SS);}
|
|
Short_To_LongString (S,SS,255);
|
|
end;
|
|
|
|
|
|
{
|
|
Procedure Str (Const D : Double;Len,fr: Longint; Var S : LongString);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
{int_Str_Double (D,Len,fr,SS);}
|
|
Short_To_LongString (S,SS,255);
|
|
end;
|
|
}
|
|
|
|
|
|
Procedure Str (Const E : Extended;Lenf,Fr: Longint; Var S : LongString);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
{int_Str_Extended (E,Len,fr,SS);}
|
|
Short_To_LongString (S,SS,255);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const C : Cardinal;Len : Longint; Var S : LongString);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const L : Longint; Len : Longint; Var S : LongString);
|
|
|
|
Var SS : ShortString;
|
|
|
|
begin
|
|
{int_Str_Longint (L,Len,fr,SS);}
|
|
Short_To_LongString (S,SS,255);
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const W : Word;Len : Longint; Var S : LongString);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const I : Integer;Len : Longint; Var S : LongString);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const B : Byte; Len : Longint; Var S : LongString);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
|
|
Procedure Str (Const SI : ShortInt; Len : Longint; Var S : LongString);
|
|
|
|
begin
|
|
end;
|
|
|
|
|
|
|
|
Procedure Delete (Var S : LongString; Index,Size: Longint);
|
|
|
|
begin
|
|
if index<=0 then
|
|
begin
|
|
Size:=Size+index-1;
|
|
index:=1;
|
|
end;
|
|
if (Index<=PLongint(s)^) and (Size>0) then
|
|
begin
|
|
if Size+Index>PLongint(s)^ then
|
|
Size:=PLongint(s)^-Index+1;
|
|
PLongint(s)^:=PLongint(s)^-Size;
|
|
if Index<=Length(s) then
|
|
Move(PAnsiChar(s)[Index+Size+4],PAnsiChar(s)[Index+4],Length(s)-Index+1);
|
|
end;
|
|
end;
|
|
|
|
Procedure Insert (Const Source : LongString; Var S : LongString; Index : Longint);
|
|
|
|
var s3,s4 : PAnsiChar;
|
|
|
|
begin
|
|
if index <= 0 then index := 1;
|
|
s3 := longString(copy (s, index, length(s)));
|
|
if index > PLongint(s)^ then index := PLongint(S)^+1;
|
|
PLongint(s)^ := index - 1;
|
|
s4 :=PAnsiChar ( NewLongString (Plongint(Source)^) );
|
|
Long_String_Concat(LongString(s4),Source,-1);
|
|
Long_String_Concat(LongString(S4),LongString(s3),-1);
|
|
Long_String_Concat(S,LongString(S4),-1);
|
|
DisposeLongstring(LongString(S3),PLongint(S3)^);
|
|
DisposeLongString(LongString(S4),PLongint(S4)^);
|
|
end;
|
|
|
|
{$ifdef lstrings_unit}
|
|
end.
|