#define  _USEOLDEXEC_ 1
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/memory.h>
#include <exec/resident.h>
#include <exec/libraries.h>
#include <exec/execbase.h>
#include <libraries/dos.h>
#include <proto/exec.h>
#include <proto/dos.h>
#include <string.h>

#define ENVOY_SERVICE 1
#ifdef ENVOY_SERVICE
/*
 *  Für eine "Envoy-Service-Library" müssen wir eine minimale Veränderung
 *  vornehmen: die Struktur MyLibrary muß um weitere Elemente vergrößert
 *  werden; die veränderte Struktur heißt svcbase und kommt aus der Datei
 *  GPService.h. Wir benutzen hier übrigens immer den Fall "ONE_GLOBAL_SECTION".
 */
#include "GPService.h"
#define MyLibrary svcbase
#define ONE_GLOBAL_SECTION 1
#endif

long _WBenchMsg;

/* Prototypes */
ULONG __asm _LibExpunge( register __a6 struct MyLibrary *libbase );
ULONG __asm _LibInit   ( register __a0 APTR seglist,
                         register __d0 struct MyLibrary *libbase );

int  __saveds __asm __UserLibInit   (register __a6 struct MyLibrary *libbase);
void __saveds __asm __UserLibCleanup(register __a6 struct MyLibrary *libbase);

int  __saveds __asm __UserDevInit   (register __d0 long unit,
                                     register __a0 struct IORequest *ior,
                                     register __a6 struct MyLibrary *libbase);
void __saveds __asm __UserDevCleanup(register __a0 struct IORequest *ior,
                                     register __a6 struct MyLibrary *libbase);

int  __saveds __asm __libfpinit     (register __a6 struct MyLibrary *libbase);
void __saveds __asm __libfpterm     (register __a6 struct MyLibrary *libbase);

#ifndef ENVOY_SERVICE
struct MyLibrary {
        struct             Library ml_Lib;
        ULONG              ml_SegList;
        ULONG              ml_Flags;
        APTR               ml_ExecBase; /* pointer to exec base  */
#ifndef ONE_GLOBAL_SECTION
        long *             ml_relocs;   /* pointer to relocs.    */
        struct MyLibrary * ml_origbase; /* pointer to original library base  */
        long               ml_numjmps;
#endif
};
#endif

typedef LONG (*myPFL)();   /* pointer to function returning 32-bit int      */

/* library initialization table, used for AUTOINIT libraries                */
struct InitTable {
        ULONG        *it_DataSize;       /* library data space size         */
        myPFL        *it_FuncTable;      /* table of entry points           */
        APTR         it_DataInit;        /* table of data initializers      */
        myPFL        it_InitFunc;        /* initialization function to run  */
};

#ifndef ONE_GLOBAL_SECTION
long _WBenchMsg;
long _OSERR;
long __base;
#endif

/* symbols generated by blink */
extern char __far _LibID[];             /* ID string                        */
extern char __far _LibName[];           /* Name string                      */
extern char __far RESLEN;               /* size of init data                */
extern long __far NEWDATAL;             /* size of global data              */
extern long __far NUMJMPS;              /* number of jmp vectors to copy    */
extern myPFL _LibFuncTab[];             /* my function table                */
extern long __far _LibVersion;          /* Version of library               */
extern long __far _LibRevision;         /* Revision of library              */
#define MYVERSION ((long)&_LibVersion)
#define MYREVISION ((long)&_LibRevision)
#define DATAWORDS ((long)&NEWDATAL)     /* magic to get right tpye of reloc */
#define SIZEJMPTAB ((long)libbase->ml_origbase->ml_numjmps)
                                        /* size in bytes of jmp table       */

/* From libent.o, needed to determine where data is loaded by loadseg       */
extern long far _Libmergeddata;

#define MYLIBRARYSIZE ((sizeof(struct MyLibrary) +3) & ~3)



struct InitTable __far _LibInitTab =  {
        (long *)(&RESLEN+MYLIBRARYSIZE),
        _LibFuncTab,
        NULL,                        /* will initialize my own data */
        _LibInit,
};

__asm ULONG _LibInit( register __a0 APTR seglist,
                      register __d0 struct MyLibrary *libbase )
{
#ifdef ONE_GLOBAL_SECTION
    long *reloc;
#endif
    long *sdata;
    char *ddata;
    long nrelocs;


    libbase->ml_SegList = (ULONG) seglist;

    /* init. library structure (since I don't do automatic data init.) */
#ifdef DEVICE
    libbase->ml_Lib.lib_Node.ln_Type = NT_DEVICE;
#else
    libbase->ml_Lib.lib_Node.ln_Type = NT_LIBRARY;
#endif
    libbase->ml_Lib.lib_Node.ln_Name =  _LibName;
    libbase->ml_Lib.lib_Flags = LIBF_SUMUSED | LIBF_CHANGED;
    libbase->ml_Lib.lib_Version = MYVERSION;
    libbase->ml_Lib.lib_Revision = MYREVISION;
    libbase->ml_Lib.lib_IdString = (APTR) _LibID;
#ifndef ONE_GLOBAL_SECTION
    libbase->ml_relocs = NULL;
    libbase->ml_origbase = libbase;
    sdata = (long *)_LibInitTab.it_FuncTable;
    libbase->ml_numjmps = (long)&NUMJMPS;
#endif

     /* Start of copy of global data after structure */
    ddata = (char *)libbase + MYLIBRARYSIZE;

    sdata = (long *)&_Libmergeddata; /* where loadseg loaded the data */
    memcpy(ddata, (void *)sdata, DATAWORDS*4);

    /* perform relocs if we want one global section for all programs */
    /* that have this lib open. If we want a global section for each */
    /* open, copy the relocs, and do them on each open call.         */
    sdata = sdata + DATAWORDS;
    nrelocs = *sdata;
#ifdef ONE_GLOBAL_SECTION
    sdata++;
    while (nrelocs > 0)
    {
       reloc = (long *)((long)ddata + *sdata++);
       *reloc += (long)ddata;
       nrelocs--;
    }

#ifndef DEVICE
    if (__UserLibInit(libbase) != 0)
       return NULL; /* abort if user init failed */
#endif

#else
    if (nrelocs)
    {
      if ((libbase->ml_relocs = AllocMem((nrelocs * 4) + 4, MEMF_PUBLIC)) == NULL)
        return 0;
      memcpy((void *)libbase->ml_relocs, (void *)sdata, (nrelocs * 4) + 4);
    }
#endif

    return ( (ULONG) libbase );
}

LONG __asm _LibOpen(
#ifdef DEVICE
                     register __d0 long unit,
                     register __a1 struct IORequest *ior,
#endif
                     register __a6 struct MyLibrary *libbase )
{
#ifndef ONE_GLOBAL_SECTION
    struct ExecBase *SysBase = *(struct ExecBase **)4;
    char *newlib;
    long *sdata, *ddata, *reloc;
    long nrelocs;
#endif

    /* mark us as having another customer */
    libbase->ml_Lib.lib_OpenCnt++;

    /* clear delayed expunges (standard procedure) */
    libbase->ml_Lib.lib_Flags &= ~LIBF_DELEXP;

#ifndef ONE_GLOBAL_SECTION
    /* Allocate new lib base */
    newlib = AllocMem((long)(MYLIBRARYSIZE +
                             ((long)&RESLEN) + SIZEJMPTAB),
                             MEMF_PUBLIC|MEMF_CLEAR);

    if (newlib == NULL) goto error;

    /* copy over data */
    memcpy(newlib, (char *)libbase - SIZEJMPTAB,
           (long)(MYLIBRARYSIZE + DATAWORDS*4 + SIZEJMPTAB));

    libbase = (struct MyLibrary *)(newlib+SIZEJMPTAB);
    libbase->ml_relocs = NULL;

    /* perform relocs */
    ddata = (long *)((char *)libbase + MYLIBRARYSIZE);
    sdata = libbase->ml_origbase->ml_relocs;
    if (sdata)
    {
       nrelocs = *sdata++;
       while (nrelocs > 0)
       {
          reloc = (long *)((long)ddata + *sdata++);
          *reloc += (long)ddata;
          nrelocs--;
       }
    }

    /* now we need to flush the cache because we copied the jmp table */
    if (SysBase->LibNode.lib_Version >= 36)
      CacheClearU();

#ifdef DEVICE
    ior->io_Device = (struct Device *)libbase; /* local copy of libary base */
#endif

    if (__libfpinit(libbase) ||
#ifdef DEVICE
        __UserDevInit(unit, ior, libbase) != 0
#else
        __UserLibInit(libbase) != 0
#endif
       )
    {
       __libfpterm(libbase);
       FreeMem(newlib, (long)(MYLIBRARYSIZE +
                       ((long)&RESLEN) + SIZEJMPTAB));
error:
       libbase->ml_origbase->ml_Lib.lib_OpenCnt--;
       return NULL; /* abort if user init failed */
    }

#else
#ifdef DEVICE
    if (__UserDevInit(unit, ior, libbase) != 0)
    {
        libbase->ml_Lib.lib_OpenCnt--;
        return NULL;
    }
#endif
#endif

    return ( (LONG) libbase );
}

ULONG __asm _LibClose(
#ifdef DEVICE
                       register __a1 struct IORequest *ior,
#endif
                       register __a6 struct MyLibrary *libbase )
{
    ULONG retval = 0;

#ifndef ONE_GLOBAL_SECTION
    struct MyLibrary *origbase;

    if (libbase != libbase->ml_origbase)
    {
#ifdef DEVICE
       __UserDevCleanup(ior, libbase);
#else
       __UserLibCleanup(libbase);
#endif
       __libfpterm(libbase);
       origbase = libbase->ml_origbase;
       FreeMem((char *)libbase-SIZEJMPTAB,
               (long)(MYLIBRARYSIZE + ((long)&RESLEN)+SIZEJMPTAB));
       libbase = origbase;
    }
#else
#ifdef DEVICE
    __UserDevCleanup(ior, libbase);
#endif
#endif

    if (( --libbase->ml_Lib.lib_OpenCnt == 0 ) &&
                        ( libbase->ml_Lib.lib_Flags & LIBF_DELEXP ))
    {
        /* no more people have me open,
         * and I have a delayed expunge pending
         */
         retval = _LibExpunge( libbase ); /* return segment list        */
    }

    return (retval);
}

ULONG __asm _LibExpunge( register __a6 struct MyLibrary *libbase )
{
    ULONG seglist = 0;
    LONG  libsize;

#ifndef ONE_GLOBAL_SECTION
    libbase = libbase->ml_origbase;
#endif

    libbase->ml_Lib.lib_Flags |= LIBF_DELEXP;
    if ( libbase->ml_Lib.lib_OpenCnt == 0 )
    {
        /* really expunge: remove libbase and freemem        */
#ifndef ONE_GLOBAL_SECTION
        if (libbase->ml_relocs)
           FreeMem(libbase->ml_relocs, (*libbase->ml_relocs * 4) + 4);
#else
        __UserLibCleanup(libbase);
#endif
        seglist = libbase->ml_SegList;

        Remove( (struct Node *) libbase);

        libsize = libbase->ml_Lib.lib_NegSize + libbase->ml_Lib.lib_PosSize;
        FreeMem( (char *) libbase - libbase->ml_Lib.lib_NegSize,(LONG) libsize );
    }

    /* return NULL or real seglist                                */
    return ( (ULONG) seglist );
}