rom/dos/fs_driver.c

   1 /*
   2     Copyright © 2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Low-level filesystem access functions, packet version
   6     Lang: English
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <dos/dos.h>
  11 #include <proto/dos.h>
  12 #include <proto/exec.h>
  13
  14 #include "dos_intern.h"
  15 #include "fs_driver.h"
  16
  17 LONG fs_LocateObject(BPTR *ret, struct MsgPort *port, BPTR parent, CONST_STRPTR name, LONG accessMode, struct DosLibrary *DOSBase)
  18 {
  19     SIPTR error = 0;
  20     BSTR bstrname = C2BSTR(name);
  21
  22     if (!bstrname)
  23         return ERROR_NO_FREE_STORE;
  24
  25     *ret = (BPTR)dopacket3(DOSBase, &error, port, ACTION_LOCATE_OBJECT, parent, bstrname, accessMode);
  26     FREEC2BSTR(bstrname);
  27
  28     return (*ret) ? 0 : error;
  29 }
  30
  31 LONG fs_Open(struct FileHandle *handle, struct MsgPort *port, BPTR lock, LONG mode, CONST_STRPTR name, struct DosLibrary *DOSBase)
  32 {
  33     ULONG action;
  34     BSTR bstrname;
  35     SIPTR error = 0;
  36     LONG status;
  37
  38     /* The MODE_* flags exactly match their corresponding ACTION_*
  39      * flags:
  40      *
  41      * MODE_READWRITE = ACTION_FINDUPDATE = 1004
  42      * MODE_OLDFILE   = ACTION_FINDINPUT  = 1005
  43      * MODE_NEWFILE   = ACTION_FINDOUTPUT = 1006
  44      *
  45      * Even so, we don't want bad data propogaing
  46      * down, so check that the mode is valid.
  47      */
  48     if ((mode == MODE_READWRITE) ||
  49         (mode == MODE_OLDFILE) ||
  50         (mode == MODE_NEWFILE))
  51         action = mode;
  52     else
  53         return ERROR_NOT_IMPLEMENTED;
  54
  55     if (!port)
  56     {
  57         /* handler pointer not set, return NIL: handle */
  58         SetIoErr(0);
  59         handle->fh_Type = BNULL;
  60         /* NIL: is not considered interactive */
  61         handle->fh_Interactive = DOSFALSE;
  62         return 0;
  63     }
  64
  65     bstrname = C2BSTR(name);
  66     if (!bstrname)
  67         return ERROR_NO_FREE_STORE;
  68
  69     status = dopacket3(DOSBase, &error, port, action, MKBADDR(handle), lock, bstrname);
  70     FREEC2BSTR(bstrname);
  71
  72     handle->fh_Type = port;
  73     return status ? 0 : error;
  74 }
  75
  76 LONG fs_ReadLink(BPTR parent, struct DevProc *dvp, CONST_STRPTR path, STRPTR buffer, ULONG size, struct DosLibrary *DOSBase)
  77 {
  78     struct MsgPort *port;
  79
  80     if (parent)
  81     {
  82         struct FileLock *fl = BADDR(parent);
  83
  84         port = fl->fl_Task;
  85     }
  86     else
  87     {
  88         port   = dvp->dvp_Port;
  89         parent = dvp->dvp_Lock;
  90     }
  91
  92     return ReadLink(port, parent, path, buffer, size);
  93 }
  94
  95 LONG fs_ChangeSignal(BPTR handle, struct Process *task, struct DosLibrary *DOSBase)
  96 {
  97     SIPTR error = 0;
  98     LONG status;
  99     struct FileHandle *fh = BADDR(handle);
 100
 101     status = dopacket3(DOSBase, &error, fh->fh_Type, ACTION_CHANGE_SIGNAL, fh->fh_Arg1, (IPTR)task, (SIPTR)NULL);
 102
 103     return status ? 0 : error;
 104 }
 105
 106 LONG fs_AddNotify(struct NotifyRequest *notify, struct DevProc *dvp, BPTR lock, struct DosLibrary *DOSBase)
 107 {
 108     SIPTR err = 0;
 109     LONG status = dopacket1(DOSBase, &err, notify->nr_Handler, ACTION_ADD_NOTIFY, (SIPTR)notify);
 110
 111     return status ? 0 : err;
 112 }