source: dev/BasicCompiler_Common/src/Source.cpp@ 88

#include <Source.h>

#include "../common.h"
#include <windows.h>



class CDefine{
    vector<string> names;
public:
    CDefine();
    ~CDefine();
    void Free();
    void Init();

    BOOL add(char *name);
    BOOL undef(char *name);
    BOOL check(char *name);
    void preprocessor_ifdef(char *buffer,bool isNot);
    void DirectiveIfdef(char *buffer);
};
CDefine objDefine;


//////////////////////////////////////
// #requireの管理
//////////////////////////////////////
class CRequireFiles{
    char **ppFilePath;
    int count;
public:
    CRequireFiles(){
        ppFilePath = (char **)malloc( 1 );
        count = 0;
    }
    ~CRequireFiles(){
        for( int i = 0; i < count; i++ ){
            free( ppFilePath[i] );
        }
        free( ppFilePath );
    }
    void clear(){
        for( int i = 0; i < count; i++ ){
            free( ppFilePath[i] );
        }
        free( ppFilePath );

        ppFilePath = (char **)malloc( 1 );
        count = 0;
    }
    bool IsIncluded( const char *includeFilePath ){
        // '/' → '\\'
        char tempPath[MAX_PATH];
        lstrcpy( tempPath, includeFilePath );
        for( int i=0; tempPath[i]; i++ ){
            if( tempPath[i] == '/' ){
                tempPath[i] = '\\';
            }
        }

        for( int i=0; i<count; i++ ){
            if( lstrcmpi( ppFilePath[i], tempPath ) == 0 ){
                return true;
            }
        }
        return false;
    }
    void Add( const char *includeFilePath ){
        // '/' → '\\'
        char tempPath[MAX_PATH];
        lstrcpy( tempPath, includeFilePath );
        for( int i=0; tempPath[i]; i++ ){
            if( tempPath[i] == '/' ){
                tempPath[i] = '\\';
            }
        }

        //既に読み込まれているとき
        if( IsIncluded( tempPath ) ) return;

        //追加
        ppFilePath = (char **)realloc(ppFilePath, ( count + 1 ) * sizeof(char *) );
        ppFilePath[count] = (char *)malloc( lstrlen(tempPath) + 1 );
        lstrcpy( ppFilePath[count], tempPath );
        count++;
    }
};
CRequireFiles requireFiles;


//////////////////////////////////////
// #define間するクラス
//////////////////////////////////////

CDefine::CDefine(){
    Init();
}
CDefine::~CDefine(){
}
void CDefine::Init(){
    names.clear();

    extern BOOL bDebugCompile;
    if(bDebugCompile) add("_DEBUG");

#ifdef _AMD64_
    add("_WIN64");
#endif

    extern BOOL bDll;
    if( bDll ){
        add("_DLL");
    }

    extern bool isUnicode;
    if( isUnicode ){
        add( "UNICODE" );
    }

    char temporary[255];
    sprintf(temporary,"_AB_VER%d",MAJOR_VER);
    add(temporary);
}
BOOL CDefine::add(char *name){
    extern HANDLE hHeap;

    //重複チェック
    if(check(name)) return 0;

    //追加
    names.push_back( name );

    return 1;
}
BOOL CDefine::undef(char *name){
    vector<string>::iterator i = names.begin();
    foreach( const string &temp, names ){
        if( temp == name ){
            names.erase( i );
            return 1;
        }
        i++;
    }

    return 0;
}
BOOL CDefine::check(char *name){

    //重複チェック
    foreach( const string &temp, names ){
        if( temp == name ){
            return 1;
        }
    }
    return 0;
}

int Search_endif(char *buffer,int i, int *pLine = 0){
    for(;;i++){
        if(buffer[i]=='\0') break;

        if( buffer[i] == '\n' ){
            if( pLine ){
                (*pLine)++;
            }
        }

        if(buffer[i-1]=='\n'){
            if(memicmp(buffer+i,"#ifdef",6)==0||memicmp(buffer+i,"#ifndef",7)==0){
                i=Search_endif(buffer,i+6, pLine);
                if(buffer[i]=='\0') break;
                continue;
            }
            else if(memicmp(buffer+i,"#endif",6)==0){
                break;
            }
        }
    }
    return i;
}

void CDefine::preprocessor_ifdef(char *buffer,bool isNot){
    int i,i2,i3;
    char temporary[VN_SIZE];

    if(isNot) i=lstrlen("#ifndef");
    else i=lstrlen("#ifdef");
    while(buffer[i]==' '||buffer[i]=='\t') i++;

    for(i2=0;;i++,i2++){
        if(buffer[i]=='\n'||buffer[i]=='\0'){
            temporary[i2]=0;
            break;
        }
        temporary[i2]=buffer[i];
    }

    int sw=0;
    if(check(temporary)) sw=1;

    if(isNot){
        //#ifndefのとき（反対にする）
        if(sw) sw=0;
        else sw=1;
    }

    //#ifdefの行を消去
    SlideString(buffer+i,-i);
    i=0;

    BOOL bElse=0;
    if(sw){
        //TRUEのとき

        //#else、#endifを探索
        for(;;i++){
            if(buffer[i]=='\0') break;

            if(i==0||buffer[i-1]=='\n'){
                if(memicmp(buffer+i,"#ifdef",6)==0||memicmp(buffer+i,"#ifndef",7)==0){
                    i=Search_endif(buffer,i+6);
                    if(buffer[i]=='\0') break;
                    continue;
                }
                else if(memicmp(buffer+i,"#else",5)==0){
                    i2=5;
                    bElse=1;
                    break;
                }
                else if(memicmp(buffer+i,"#endif",6)==0){
                    i2=6;
                    bElse=0;
                    break;
                }
            }
        }

        //行を消去
        SlideString(buffer+i+i2,-i2);

        if(bElse){
            //#elseがある場合はその区間を消去

            for(i2=i,i3=0;;i2++){
                if(buffer[i2]=='\0') break;

                if(buffer[i2]=='\n') i3++;

                if(i2==0||buffer[i2-1]=='\n'){
                    if(memicmp(buffer+i2,"#ifdef",6)==0||memicmp(buffer+i2,"#ifndef",7)==0){
                        i2=Search_endif(buffer,i2+6, &i3 );
                        if(buffer[i2]=='\0') break;
                        continue;
                    }
                    if(memicmp(buffer+i2,"#endif",6)==0){
                        i2+=6;
                        break;
                    }
                }
            }

            //ソースコード区間を消去し、改行コードを挿入
            SlideString(buffer+i2,i-i2+i3);
            memset(buffer+i,'\n',i3);
        }
    }
    else{
        //FALSEのとき

        //#else、#endifを探索
        for(i2=i,i3=0;;i2++){
            if(buffer[i2]=='\0') break;

            if(buffer[i2]=='\n') i3++;

            if(i2==0||buffer[i2-1]=='\n'){
                if(memicmp(buffer+i2,"#ifdef",6)==0||memicmp(buffer+i2,"#ifndef",7)==0){
                    i2=Search_endif(buffer,i2+6, &i3 );
                    if(buffer[i2]=='\0') break;
                    continue;
                }
                else if(memicmp(buffer+i2,"#else",5)==0){
                    i2+=5;
                    bElse=1;
                    break;
                }
                else if(memicmp(buffer+i2,"#endif",6)==0){
                    i2+=6;
                    bElse=0;
                    break;
                }
            }
        }

        //ソースコード区間を消去し、改行コードを挿入
        SlideString(buffer+i2,i-i2+i3);
        memset(buffer+i,'\n',i3);

        if(bElse){
            //#endifを探索
            for(;;i++){
                if(buffer[i]=='\0') break;

                if(i==0||buffer[i-1]=='\n'){
                    if(memicmp(buffer+i,"#ifdef",6)==0||memicmp(buffer+i,"#ifndef",7)==0){
                        i=Search_endif(buffer,i+6);
                        if(buffer[i]=='\0') break;
                        continue;
                    }
                    else if(memicmp(buffer+i,"#endif",6)==0){
                        i2=6;
                        bElse=0;
                        break;
                    }
                }
            }

            //行を消去
            SlideString(buffer+i+i2,-i2);
        }
    }
}


void CDefine::DirectiveIfdef(char *buffer){
    int i,i2,i3,sw;
    char temporary[VN_SIZE];

    for(i=0;;i++){
        if(buffer[i]=='\0') break;

        if(i==0||(i>=1&&buffer[i-1]=='\n')){
            sw=0;
            if(memicmp(buffer+i,"#define",7)==0){
                i2=i+7;
                while(buffer[i2]==' '||buffer[i2]=='\t') i2++;

                for(i3=0;;i2++,i3++){
                    if(buffer[i2]=='\n'||buffer[i2]=='\0'){
                        temporary[i3]=0;
                        break;
                    }
                    temporary[i3]=buffer[i2];
                }

                add(temporary);

                i2-=i;

                //ディレクティブを消去
                SlideString(buffer+i+i2,-i2);
            }
            if(memicmp(buffer+i,"#undef",6)==0){
                i2=i+7;
                while(buffer[i2]==' '||buffer[i2]=='\t') i2++;

                for(i3=0;;i2++,i3++){
                    if(buffer[i2]=='\n'||buffer[i2]=='\0'){
                        temporary[i3]=0;
                        break;
                    }
                    temporary[i3]=buffer[i2];
                }

                undef(temporary);

                i2-=i;

                //ディレクティブを消去
                SlideString(buffer+i+i2,-i2);
            }
            else if(memicmp(buffer+i,"#ifdef",6)==0){
                preprocessor_ifdef(buffer+i,false);
                continue;
            }
            else if(memicmp(buffer+i,"#ifndef",7)==0){
                preprocessor_ifdef(buffer+i,true);
                continue;
            }
            else continue;
        }
    }
}




bool Text::ReadFile( const string &filePath ){
    //ファイルオープン
    HANDLE hFile=CreateFile(filePath.c_str(),GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
    if(hFile==INVALID_HANDLE_VALUE){
        return false;
    }

    length = GetFileSize( hFile, NULL );

    buffer = (char *)realloc( buffer, length + 1 );

    //読み込み
    DWORD dwAccBytes;
    ::ReadFile(hFile,buffer,length,&dwAccBytes,0);
    buffer[dwAccBytes]=0;

    //ファイルクローズ
    CloseHandle(hFile);

    return true;
}

void BasicSource::ChangeReturnLineChar(){
#ifdef _DEBUG
    //改行コードの整合性チェック
    for( int i=0; ; i++ ){
        if( buffer[i] == '\0' ){
            break;
        }
        if( buffer[i]!='\r' && buffer[i+1]=='\n'
            ||  buffer[i]=='\r' && buffer[i+1]!='\n' ){
                char temporary[255];
                strncpy( temporary, buffer + i-100, 130 );
                temporary[130] = 0;
                for(int i2=0; ;i2++){
                    if(temporary[i2]=='\r') temporary[i2]='A';
                    if(temporary[i2]=='\n') temporary[i2]='B';
                    if(temporary[i2]=='\0') break;
                }

                extern HWND hOwnerEditor;
                MessageBox( hOwnerEditor, temporary, "改行コードの整合性チェック", MB_OK | MB_ICONEXCLAMATION );
        }
    }
#endif

    //改行コードのCRLFをLFに変換
    int i,i2;
    for(i=0,i2=0;;i++,i2++){
        if(buffer[i]=='\r'&&buffer[i+1]=='\n') i++;
        buffer[i2]=buffer[i];
        if(buffer[i]=='\0') break;
    }

    length = i;
}

void BasicSource::RemoveComments(){
    int i,i2,i3,IsStr;
    char *temporary;
    temporary=(char *)GlobalAlloc(GMEM_FIXED,lstrlen(buffer)+1);
    for(i=0,i2=0,i3=0,IsStr=0;;i++,i2++){
        if(buffer[i]=='\"') IsStr^=1;
        if(buffer[i]=='\n'||buffer[i]=='\0'){
            i2--;
            while(temporary[i2]==' '||temporary[i2]=='\t') i2--;
            i2++;

            if(i3){
                //複数行に渡る注釈文の中に改行が存在するとき
                memset(temporary+i2,'\n',i3);
                i2+=i3;
                i3=0;
            }
        }
        if(buffer[i]=='\''&&IsStr==0){
            //注釈文
            i2--;
            while(temporary[i2]==' '||temporary[i2]=='\t') i2--;
            i2++;
            while(buffer[i]!='\n'&&buffer[i]!='\0') i++;
        }
        if(buffer[i]=='/'&&buffer[i+1]=='*'&&IsStr==0){
            //注釈文（複数行）
            i+=2;
            i3=0;
            while(!(buffer[i]=='*'&&buffer[i+1]=='/')){
                if(buffer[i]=='\n') i3++;
                if(buffer[i]=='\0') break;
                i++;
            }
            if(buffer[i]){
                i+=2;
            }
            i--;
            i2--;
            continue;
        }
        temporary[i2]=buffer[i];
        if(buffer[i]=='\0') break;
    }
    lstrcpy(buffer,temporary);
    GlobalFree(temporary);
}

bool BasicSource::ReadFile_InIncludeDirective( const string &filePath ){
    if( !Text::ReadFile( filePath ) ){
        return false;
    }

    // 改行コードをCRLFからLFに変換
    ChangeReturnLineChar();

    // コメントを削除
    RemoveComments();

    // #ifdefディレクティブを処理
    objDefine.DirectiveIfdef( buffer );

    // アンダーバーによる改行を正規表現に戻す
    RemoveReturnLineUnderbar();

    // ダミー改行をセット
    Realloc( length + 2 );
    SlideString( buffer, 2 );
    buffer[0] = '\n';
    buffer[1] = '\n';

    return true;
}

void BasicSource::DirectiveIncludeOrRequire(){
    extern HANDLE hHeap;
    extern char szIncludeDir[MAX_PATH];
    extern char BasicCurDir[MAX_PATH];
    extern INCLUDEFILEINFO IncludeFileInfo;
    int i,i2,i3,sw1,LineNum,FileLayer[255],layer,LastFileByte[255];
    char temporary[MAX_PATH],temp2[MAX_PATH+255],*LayerDir[255];

    IncludeFileInfo.ppFileNames=(char **)HeapAlloc(hHeap,HEAP_ZERO_MEMORY,sizeof(char *));
    extern char SourceFileName[MAX_PATH];
    IncludeFileInfo.ppFileNames[0]=(char *)HeapAlloc(hHeap,0,lstrlen(SourceFileName)+1);
    lstrcpy(IncludeFileInfo.ppFileNames[0],SourceFileName);
    IncludeFileInfo.FilesNum=1;

    layer=0;
    FileLayer[layer]=0;
    LastFileByte[layer]=GetLength();
    LineNum=0;

    //参照ディレクトリ
    LayerDir[0]=(char *)HeapAlloc(hHeap,0,lstrlen(BasicCurDir)+1);
    lstrcpy(LayerDir[0],BasicCurDir);

    for(i=0;;i++){
        if(buffer[i]=='\0'){
            IncludeFileInfo.LineOfFile[LineNum]=-1;
            break;
        }
        if(buffer[i]=='\n'){
            IncludeFileInfo.LineOfFile[LineNum]=FileLayer[layer];
            LineNum++;
        }
        if(i>LastFileByte[layer]){
            HeapDefaultFree(LayerDir[layer]);
            layer--;
        }
        if((buffer[i-1]=='\n'||i==0)&&buffer[i]=='#'){
            bool isRequire = false;
            if(memcmp( buffer + i + 1, "include", 7 ) == 0
                || memcmp( buffer + i + 1, "require", 7 ) == 0){

                    //#requireの場合
                    if( buffer[i + 1] == 'r' ) isRequire = true;

                    i2=i+8;
                    while(buffer[i2]==' '||buffer[i2]=='\t') i2++;

                    if(buffer[i2]=='\"') sw1=0;
                    else if(buffer[i2]=='<') sw1=1;
                    i2++;

                    for(i3=0;;i2++,i3++){
                        if((buffer[i2]=='\"'&&sw1==0)||(buffer[i2]=='>'&&sw1==1)||buffer[i2]=='\n'||buffer[i2]=='\0'){
                            temporary[i3]=0;
                            break;
                        }
                        temporary[i3]=buffer[i2];
                    }
                    while(buffer[i2]!='\n'&&buffer[i2]!='\0') i2++;

                    if(sw1){
                        sprintf(temp2,"%s%s",szIncludeDir,temporary);
                        lstrcpy(temporary,temp2);
                    }
                    else GetFullPath(temporary,LayerDir[layer]);
            }
            else if(memcmp(buffer+i+1,"prompt",6)==0){
                i2=i+7;
                sprintf(temporary,"%sbasic\\prompt.sbp",szIncludeDir);
            }
            else if(memcmp(buffer+i+1,"N88BASIC",8)==0){
                i2=i+9;
                sprintf(temporary,"%sbasic\\prompt.sbp",szIncludeDir);
            }
            else if(memcmp(buffer+i+1,"console",7)==0){
                //サブシステム タイプをCUIに変更
                extern unsigned short TypeOfSubSystem;
                TypeOfSubSystem=IMAGE_SUBSYSTEM_WINDOWS_CUI;

                i2=i+8;
                sprintf(temporary,"%sbasic\\dos_console.sbp",szIncludeDir);
            }
            else continue;

            if(i){
                //ディレクティブが消えるため、一行減ってしまうのを防ぐ（basic.sbpを除く）
                SlideString(buffer+i2,1);
                buffer[i2]='\n';
                for(i3=0;i3<=layer;i3++) LastFileByte[i3]++;
            }

            IncludeFileInfo.ppFileNames=(char **)HeapReAlloc(hHeap,0,IncludeFileInfo.ppFileNames,(IncludeFileInfo.FilesNum+1)*sizeof(char *));
            IncludeFileInfo.ppFileNames[IncludeFileInfo.FilesNum]=(char *)HeapAlloc(hHeap,0,lstrlen(temporary)+1);
            lstrcpy(IncludeFileInfo.ppFileNames[IncludeFileInfo.FilesNum],temporary);

            layer++;
            FileLayer[layer]=IncludeFileInfo.FilesNum;
            IncludeFileInfo.FilesNum++;

            //#requireの場合では、既に読み込まれているファイルは読み込まないようにする
            bool isFake = false;
            if( isRequire ){
                if( requireFiles.IsIncluded( temporary ) ){
                    //既に読み込まれているとき
                    isFake = true;
                }
            }

            BasicSource source;

            if( isFake ){
                //既に読み込まれているときは空データ
                source.SetBuffer( "" );
            }
            else{
                //取り込まれたファイルを収集する
                requireFiles.Add( temporary );

                //インクルードファイルを読み込む
                if( !source.ReadFile_InIncludeDirective( temporary ) ){
                    sprintf(temp2,"インクルードファイル \"%s\" をオープンできません",temporary);
                    SetError(-1,temp2,i);
                    break;
                }
            }

            i3=lstrlen(buffer)+source.GetLength();
            Realloc( i3 );
            SlideString(buffer+i2,source.GetLength()+(i-i2));
            memcpy(buffer+i,source.GetBuffer(),source.GetLength());

            //新しい参照ディレクトリをセット
            char temp4[MAX_PATH];
            _splitpath(temporary,temp2,temp4,0,0);
            lstrcat(temp2,temp4);
            LayerDir[layer]=(char *)HeapAlloc(hHeap,0,lstrlen(temp2)+1);
            lstrcpy(LayerDir[layer],temp2);

            //ファイル範囲をスライド
            LastFileByte[layer]=i+source.GetLength()-1;
            for(i3=0;i3<layer;i3++) LastFileByte[i3]+=source.GetLength()+(i-i2);

            i--;
        }
    }

    HeapDefaultFree(LayerDir[0]);

    length = lstrlen(buffer);
}

int KillReturnCode_InParameter(char *buffer,int *pRnum,char cBeginPare,char cEndPare){
    int i,i2,i3,IsStr;

    //カッコ'('直下の改行
    while(buffer[0]=='\n'){
        SlideString(buffer+1,-1);
        (*pRnum)++;
    }

    for(i=0,IsStr=0;;i++){
        if(IsDBCSLeadByte(buffer[i])&&buffer[i+1]){
            i++;
            continue;
        }

        if(buffer[i]=='\"') IsStr^=1;

        if(buffer[i]=='\0') break;  //エラー
        if(buffer[i]=='\n'){
            i2=0;
            i3=0;
            while(buffer[i+i2]=='\n'){
                i2++;
                i3++;
                while(buffer[i+i2]==' '||buffer[i+i2]=='\t') i2++;
            }
            while(buffer[i+i2]==' '||buffer[i+i2]=='\t') i2++;

            if(buffer[i+i2]==cEndPare){
                SlideString(buffer+i+i2,-i2);
                (*pRnum)+=i3;
                break;
            }

            //エラー
            break;
        }

        if(buffer[i]==cBeginPare&&IsStr==0){
            i++;
            i2=KillReturnCode_InParameter(buffer+i,pRnum,cBeginPare,cEndPare);
            i+=i2;
            if(buffer[i]!=cEndPare) break;
            continue;
        }
        if(buffer[i]==cEndPare&&IsStr==0) break;

        if(buffer[i]==','&&buffer[i+1]=='\n'&&IsStr==0){
            i++;
            while(buffer[i]=='\n'){
                SlideString(buffer+i+1,-1);
                (*pRnum)++;
            }
            i--;
        }
    }
    return i;
}
void BasicSource::RemoveReturnLineUnderbar(){
    int i,i2;

    //アンダーバーによる改行
    for(i=0;;i++){
        i2=0;
        while(buffer[i]=='_'&&buffer[i+1]=='\n'){
            i2++;
            SlideString(buffer+i+2,-2);
            while(buffer[i]=='\n'){
                SlideString(buffer+i+1,-1);
                i2++;
            }
            for(;;i++){
                if(buffer[i]=='_'&&buffer[i+1]=='\n') break;
                if(buffer[i]=='\n'||buffer[i]=='\0'){
                    SlideString(buffer+i,i2);
                    memset(buffer+i,'\n',i2);
                    break;
                }
            }
        }
        if(buffer[i]=='\0') break;
    }

    //カッコ内パラメータの改行
    int IsStr,rnum;
    for(i=0,IsStr=0,rnum=0;;i++){
        if(IsDBCSLeadByte(buffer[i])&&buffer[i+1]){
            i++;
            continue;
        }
        if(buffer[i]=='\0') break;
        if(buffer[i]=='\n'){
            if(rnum){
                SlideString(buffer+i+1,rnum);
                memset(buffer+i+1,'\n',rnum);
                rnum=0;
            }
        }
        if(buffer[i]=='\"') IsStr^=1;
        if(buffer[i]=='('&&IsStr==0){
            i++;
            i2=KillReturnCode_InParameter(buffer+i,&rnum,'(',')');
            i+=i2;
            if(buffer[i]!=')') break;
        }
        if(buffer[i]=='['&&IsStr==0){
            i++;
            i2=KillReturnCode_InParameter(buffer+i,&rnum,'[',']');
            i+=i2;
            if(buffer[i]!=']') break;
        }
    }

    length = lstrlen(buffer);
}

void BasicSource::SetBuffer( const char *buffer ){
    this->buffer = (char *)calloc( lstrlen(buffer) + 1, 1 );
    lstrcpy( this->buffer, buffer );
    length = lstrlen(buffer);

    // ダミー改行をセット
    Realloc( length + 2 );
    SlideString( this->buffer, 2 );
    this->buffer[0] = '\n';
    this->buffer[1] = '\n';
}

bool BasicSource::ReadFile( const string &filePath ){
    if( !Text::ReadFile( filePath ) ){
        return false;
    }

    // 改行コードをCRLFからLFに変換
    ChangeReturnLineChar();

    // basic.sbpをインクルード
    const char *headCode = "#include <basic.sbp>\n";
    Realloc( length + lstrlen(headCode) );
    SlideString( buffer, lstrlen(headCode) );
    memcpy( buffer, headCode, lstrlen(headCode) );

    // #defineと#requireを初期化
    objDefine.Init();
    requireFiles.clear();

    // コメントを削除
    RemoveComments();

    // #ifdefディレクティブを処理
    objDefine.DirectiveIfdef( buffer );

    //最終行には文字を含ませないようにする
    Realloc( length + 1 );
    lstrcat( buffer, "\n" );

    // #include / #require ディレクティブを処理
    DirectiveIncludeOrRequire();

    // アンダーバーによる改行を正規表現に戻す
    RemoveReturnLineUnderbar();

    // ダミー改行をセット
    Realloc( length + 2 );
    SlideString( buffer, 2 );
    buffer[0] = '\n';
    buffer[1] = '\n';

    extern char *basbuf;
    basbuf = GetBuffer();

    return true;
}

bool BasicSource::Generate( const string &genName, const char *buffer ){
    return true;
}

void BasicSource::Addition( const char *buffer ){
    Realloc( length + lstrlen(buffer) );
    lstrcat( this->buffer, buffer );
}