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92 lines
2.8 KiB
ObjectPascal
92 lines
2.8 KiB
ObjectPascal
{ Efficient string buffer helper
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Copyright (C) 2006-2008 Micha Nelissen
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This library is Free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This program is diStributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; withOut even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
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for more details.
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You should have received a Copy of the GNU Library General Public License
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along with This library; if not, Write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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This license has been modified. See file LICENSE.ADDON for more information.
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Should you find these sources without a LICENSE File, please contact
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me at ales@chello.sk
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}
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unit lStrBuffer;
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{$mode objfpc}{$h+}
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interface
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type
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PStringBuffer = ^TStringBuffer;
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TStringBuffer = record
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Memory: pchar;
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Pos: pchar;
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end;
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function InitStringBuffer(InitialSize: integer): TStringBuffer;
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procedure AppendString(var ABuffer: TStringBuffer; const ASource: string); overload;
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procedure AppendString(var ABuffer: TStringBuffer; const ASource: shortstring); overload;
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procedure AppendString(var ABuffer: TStringBuffer; ASource: pointer; ALength: PtrUInt); overload;
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procedure AppendString(var ABuffer: TStringBuffer; ASource: pchar); overload;
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procedure AppendChar(var ABuffer: TStringBuffer; AChar: char);
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implementation
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function InitStringBuffer(InitialSize: integer): TStringBuffer;
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begin
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Result.Memory := GetMem(InitialSize);
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Result.Pos := Result.Memory;
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end;
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procedure AppendString(var ABuffer: TStringBuffer; ASource: pointer; ALength: PtrUInt);
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var
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lPos, lSize: PtrUInt;
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begin
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if ALength = 0 then exit;
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lPos := PtrUInt(ABuffer.Pos - ABuffer.Memory);
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lSize := PtrUInt(MemSize(ABuffer.Memory));
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{ reserve 2 extra spaces }
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if lPos + ALength + 2 >= lSize then
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begin
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ReallocMem(ABuffer.Memory, lPos + ALength + lSize);
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ABuffer.Pos := ABuffer.Memory + lPos;
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end;
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Move(ASource^, ABuffer.Pos^, ALength);
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Inc(ABuffer.Pos, ALength);
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end;
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procedure AppendString(var ABuffer: TStringBuffer; ASource: pchar);
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begin
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if ASource = nil then exit;
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AppendString(ABuffer, ASource, StrLen(ASource));
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end;
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procedure AppendString(var ABuffer: TStringBuffer; const ASource: shortstring);
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begin
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AppendString(ABuffer, @ASource[1], Length(ASource));
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end;
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procedure AppendString(var ABuffer: TStringBuffer; const ASource: string);
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begin
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AppendString(ABuffer, PChar(ASource), Length(ASource));
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end;
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procedure AppendChar(var ABuffer: TStringBuffer; AChar: char);
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begin
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ABuffer.Pos^ := AChar;
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Inc(ABuffer.Pos);
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end;
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end.
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