/* asmcode.c */
/*****************************************************************************/
/* AS-Portierung                                                             */
/*                                                                           */
/* Verwaltung der Code-Datei                                                 */
/*                                                                           */
/* Historie: 18. 5.1996 Grundsteinlegung                                     */
/*                                                                           */
/*****************************************************************************/

#include "stdinc.h"
#include <string.h>

#include "version.h"
#include "endian.h"
#include "chunks.h"
#include "asmdef.h"
#include "asmsub.h"

static Word LenSoFar;
static LongInt RecPos,LenPos;

#define CodeBufferSize 512

static Word CodeBufferFill;
static Byte CodeBuffer[CodeBufferSize+1];

/**
	static Boolean Write2(void *Buffer)
BEGIN
   Boolean OK;

   if (BigEndian) WSwap(Buffer,2);
   OK=(fwrite(Buffer,1,2,PrgFile)==2);
   if (BigEndian) WSwap(Buffer,2);
   return OK;
END

	static Boolean Write4(void *Buffer)
BEGIN
   Boolean OK;

   if (BigEndian) DSwap(Buffer,4);
   OK=(fwrite(Buffer,1,4,PrgFile)==4);
   if (BigEndian) DSwap(Buffer,4);
   return OK;
END
**/
        static void FlushBuffer(void)
BEGIN
   if (CodeBufferFill>0)
    BEGIN
     if (fwrite(CodeBuffer,1,CodeBufferFill,PrgFile)!=CodeBufferFill) ChkIO(10004);
     CodeBufferFill=0;
    END
END

	void DreheCodes(void)
BEGIN
   int z;
   LongInt l=CodeLen*Granularity();

    switch (ActListGran)
     BEGIN
      case 2: 
       for (z=0; z<(l>>1); z++) 
        WAsmCode[z]=((WAsmCode[z]&0xff)<<8)+((WAsmCode[z]&0xff00)>>8);
       break;
      case 4:
       for (z=0; z<(l>>2); z++)
        {
#ifdef __STDC__
	DAsmCode[z]=((DAsmCode[z]&0xff000000u)>>24)+
		    ((DAsmCode[z]&0x00ff0000u)>>8)+
		    ((DAsmCode[z]&0x0000ff00u)<<8)+
		    ((DAsmCode[z]&0x000000ffu)<<24);
#else
	DAsmCode[z]=((DAsmCode[z]&0xff000000)>>24)+
		    ((DAsmCode[z]&0x00ff0000)>>8)+
		    ((DAsmCode[z]&0x0000ff00)<<8)+
		    ((DAsmCode[z]&0x000000ff)<<24);
#endif
        }
       break;
     END
END

/*--- neuen Record in Codedatei anlegen.  War der bisherige leer, so wird ---
 ---- dieser ueberschrieben. ------------------------------------------------*/

	static void WrRecHeader(void)
BEGIN
   Byte b;

   if (ActPC!=SegCode)
    BEGIN
     b=FileHeaderDataRec; if (fwrite(&b,1,1,PrgFile)!=1) ChkIO(10004);
    END
   if (fwrite(&HeaderID,1,1,PrgFile)!=1) ChkIO(10004);
   if (ActPC!=SegCode)
    BEGIN
     b=ActPC; if (fwrite(&b,1,1,PrgFile)!=1) ChkIO(10004);
     b=Grans[ActPC]; if (fwrite(&b,1,1,PrgFile)!=1) ChkIO(10004);
    END
END

       	void NewRecord(LargeWord NStart)
BEGIN
   LongInt h;
   LongWord PC;

   FlushBuffer();
   if (LenSoFar==0)
    BEGIN
     if (fseek(PrgFile,RecPos,SEEK_SET)!=0) ChkIO(10003);
     WrRecHeader();
     h=NStart;
     if (NOT Write4(PrgFile,&h)) ChkIO(10004);
     LenPos=ftell(PrgFile);
     if (NOT Write2(PrgFile,&LenSoFar)) ChkIO(10004);
    END
   else
    BEGIN
     h=ftell(PrgFile);
     if (fseek(PrgFile,LenPos,SEEK_SET)!=0) ChkIO(10003);
     if (NOT Write2(PrgFile,&LenSoFar)) ChkIO(10004);
     if (fseek(PrgFile,h,SEEK_SET)!=0) ChkIO(10003);

     RecPos=h; LenSoFar=0;
     WrRecHeader();
     PC=NStart;
     if (NOT Write4(PrgFile,&PC)) ChkIO(10004);
     LenPos=ftell(PrgFile);
     if (NOT Write2(PrgFile,&LenSoFar)) ChkIO(10004);
    END
END

/*--- Codedatei eroeffnen --------------------------------------------------*/

        void OpenFile(void)
BEGIN
   Word h;

   errno=0;
   PrgFile=fopen(OutName,OPENWRMODE);
   if (PrgFile==Nil) ChkIO(10001);

   errno=0; h=FileMagic;
   if (NOT Write2(PrgFile,&h)) ChkIO(10004);

   CodeBufferFill=0;
   RecPos=ftell(PrgFile); LenSoFar=0;
   NewRecord(PCs[ActPC]);
END

/*---- Codedatei schliessen -------------------------------------------------*/

        void CloseFile(void)
BEGIN
   Byte Head;
   String h;
   LongWord Adr;

   sprintf(h,"AS %s/%s-%s",Version,ARCHPRNAME,ARCHSYSNAME);

   NewRecord(PCs[ActPC]);
   fseek(PrgFile,RecPos,SEEK_SET);

   if (StartAdrPresent)
    BEGIN
     Head=FileHeaderStartAdr;
     if (fwrite(&Head,sizeof(Head),1,PrgFile)!=1) ChkIO(10004);
     Adr=StartAdr;
     if (NOT Write4(PrgFile,&Adr)) ChkIO(10004);
    END

   Head=FileHeaderEnd;
   if (fwrite(&Head,sizeof(Head),1,PrgFile)!=1) ChkIO(10004);
   if (fwrite(h,1,strlen(h),PrgFile)!=strlen(h)) ChkIO(10004);
   fclose(PrgFile); if (Magic!=0) unlink(OutName); 
END

/*--- erzeugten Code einer Zeile in Datei ablegen ---------------------------*/

	void WriteBytes(void)
BEGIN
   Word ErgLen;

   if (CodeLen==0) return; ErgLen=CodeLen*Granularity();
   if ((TurnWords!=0)!=(BigEndian!=0)) DreheCodes();
   if (((LongInt)LenSoFar)+((LongInt)ErgLen)>0xffff) NewRecord(PCs[ActPC]);
   if (CodeBufferFill+ErgLen<CodeBufferSize)
    BEGIN
     memcpy(CodeBuffer+CodeBufferFill,BAsmCode,ErgLen);
     CodeBufferFill+=ErgLen;
    END
   else
    BEGIN
     FlushBuffer();
     if (ErgLen<CodeBufferSize)
      BEGIN
       memcpy(CodeBuffer,BAsmCode,ErgLen); CodeBufferFill=ErgLen;
      END
     else if (fwrite(BAsmCode,1,ErgLen,PrgFile)!=ErgLen) ChkIO(10004);
    END
   LenSoFar+=ErgLen;
   if ((TurnWords!=0)!=(BigEndian!=0)) DreheCodes();
END

        void RetractWords(Word Cnt)
BEGIN
   Word ErgLen;

   ErgLen=Cnt*Granularity();
   if (LenSoFar<ErgLen)
    BEGIN
     WrError(1950); return;
    END

   if (MakeUseList) DeleteChunk(SegChunks+ActPC,ProgCounter()-Cnt,Cnt);

   PCs[ActPC]-=Cnt;

   if (CodeBufferFill>=ErgLen) CodeBufferFill-=ErgLen;
   else
    BEGIN
     if (fseek(PrgFile,-(ErgLen-CodeBufferFill),SEEK_CUR)==-1)
      ChkIO(10004);
     CodeBufferFill=0;
    END

   LenSoFar-=ErgLen;

   Retracted=True;
END

	void asmcode_init(void)
BEGIN
END