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{ Efficient string buffer helper
Copyright (C) 2006-2008 Micha Nelissen
This library is Free software; you can redistribute it and/or modify it
under the terms of the GNU Library 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 Library General Public License
for more details.
You should have received a Copy of the GNU Library General Public License
along with This library; if not, Write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
This license has been modified. See file LICENSE.ADDON for more information.
Should you find these sources without a LICENSE File, please contact
me at ales@chello.sk
}
unit lStrBuffer;
{$mode objfpc}{$h+}
interface
type
PStringBuffer = ^TStringBuffer;
TStringBuffer = record
Memory: pchar;
Pos: pchar;
end;
function InitStringBuffer(InitialSize: integer): TStringBuffer;
procedure AppendString(var ABuffer: TStringBuffer; const ASource: string); overload;
procedure AppendString(var ABuffer: TStringBuffer; const ASource: shortstring); overload;
procedure AppendString(var ABuffer: TStringBuffer; ASource: pointer; ALength: PtrUInt); overload;
procedure AppendString(var ABuffer: TStringBuffer; ASource: pchar); overload;
procedure AppendChar(var ABuffer: TStringBuffer; AChar: char);
implementation
function InitStringBuffer(InitialSize: integer): TStringBuffer;
begin
Result.Memory := GetMem(InitialSize);
Result.Pos := Result.Memory;
end;
procedure AppendString(var ABuffer: TStringBuffer; ASource: pointer; ALength: PtrUInt);
var
lPos, lSize: PtrUInt;
begin
if ALength = 0 then exit;
lPos := PtrUInt(ABuffer.Pos - ABuffer.Memory);
lSize := PtrUInt(MemSize(ABuffer.Memory));
{ reserve 2 extra spaces }
if lPos + ALength + 2 >= lSize then
begin
ReallocMem(ABuffer.Memory, lPos + ALength + lSize);
ABuffer.Pos := ABuffer.Memory + lPos;
end;
Move(ASource^, ABuffer.Pos^, ALength);
Inc(ABuffer.Pos, ALength);
end;
procedure AppendString(var ABuffer: TStringBuffer; ASource: pchar);
begin
if ASource = nil then exit;
AppendString(ABuffer, ASource, StrLen(ASource));
end;
procedure AppendString(var ABuffer: TStringBuffer; const ASource: shortstring);
begin
AppendString(ABuffer, @ASource[1], Length(ASource));
end;
procedure AppendString(var ABuffer: TStringBuffer; const ASource: string);
begin
AppendString(ABuffer, PChar(ASource), Length(ASource));
end;
procedure AppendChar(var ABuffer: TStringBuffer; AChar: char);
begin
ABuffer.Pos^ := AChar;
Inc(ABuffer.Pos);
end;
end.
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