/*
    (C) 1995-96 AROS - The Amiga Replacement OS
    $Id: assignlock.c,v 1.2 1996/08/01 17:40:47 digulla Exp $
    $Log: assignlock.c,v $
    Revision 1.2  1996/08/01 17:40:47  digulla
    Added standard header for all files

    Desc:
    Lang: english
*/
#include <exec/memory.h>
#include <clib/exec_protos.h>
#include <dos/dosextens.h>
#include <dos/filesystem.h>

/*****************************************************************************

    NAME */
	#include <clib/dos_protos.h>

	__AROS_LH2(BOOL, AssignLock,

/*  SYNOPSIS */
	__AROS_LA(STRPTR, name, D1),
	__AROS_LA(BPTR,   lock, D2),

/*  LOCATION */
	struct DosLibrary *, DOSBase, 102, Dos)

/*  FUNCTION
	Create an assign from a given name to a lock. Replaces any older
	assignments from that name, 0 cancels the assign completely. Do not
	use or free the lock after calling this function - it becomes
	the assign and will be freed by the system if the assign is removed.

    INPUTS
	name - NUL terminated name of the assign.
	lock - Lock to assigned directory.

    RESULT
	!=0 success, 0 on failure. IoErr() gives additional information
	in that case. The lock is freed on failure and must not be used
	in that case too.

    NOTES

    EXAMPLE

    BUGS

    SEE ALSO

    INTERNALS

    HISTORY
	29-10-95    digulla automatically created from
			    dos_lib.fd and clib/dos_protos.h

*****************************************************************************/
{
    __AROS_FUNC_INIT
    __AROS_BASE_EXT_DECL(struct DosLibrary *,DOSBase)

    BOOL success=1;    
    struct DosList *dl, *newdl=NULL;
    struct Process *me=(struct Process *)FindTask(NULL);
    struct IOFileSys io,*iofs=&io;
    struct FileHandle *fh=(struct FileHandle *)BADDR(lock);

    if(lock)
    {
        newdl=MakeDosEntry(name,DLT_DIRECTORY);
        if(newdl==NULL)
        {
	    UnLock(lock);
	    me->pr_Result2=ERROR_NO_FREE_STORE;
    	    return 0;
	}else
	{
	    newdl->dol_Unit  =fh->fh_Unit;
	    newdl->dol_Device=fh->fh_Device;
    	    FreeDosObject(DOS_FILEHANDLE,fh);
    	}
    }

    dl=LockDosList(LDF_DEVICES|LDF_ASSIGNS|LDF_WRITE);
    
    dl=FindDosEntry(dl,name,LDF_DEVICES|LDF_ASSIGNS);
    if(dl==NULL)
    {
	if(newdl!=NULL)
	    AddDosEntry(newdl);
    }else if(dl->dol_Type==DLT_DEVICE)
    {
        dl=newdl;
        me->pr_Result2=ERROR_OBJECT_EXISTS;
        success=0;
    }else
    {
	RemDosEntry(dl);
	if(newdl!=NULL)
	    AddDosEntry(newdl);
    }

    if(dl!=NULL)
    {
	/* Prepare I/O request. */
        iofs->IOFS.io_Message.mn_Node.ln_Type=NT_REPLYMSG;
        iofs->IOFS.io_Message.mn_ReplyPort   =&me->pr_MsgPort;
        iofs->IOFS.io_Message.mn_Length      =sizeof(struct IOFileSys);
        iofs->IOFS.io_Device =dl->dol_Device;
        iofs->IOFS.io_Unit   =dl->dol_Unit;
        iofs->IOFS.io_Command=FSA_CLOSE;
        iofs->IOFS.io_Flags  =0;
                                
        /* Send the request. No errors possible. */
        (void)DoIO(&iofs->IOFS);
                                        
	FreeDosEntry(dl);
    }
    
    UnLockDosList(LDF_DEVICES|LDF_ASSIGNS|LDF_WRITE);

    return success;    
    __AROS_FUNC_EXIT
} /* AssignLock */