rom/dos/finddosentry.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8
   9 #include <dos/dosextens.h>
  10 #include <proto/utility.h>
  11 #include "dos_intern.h"
  12
  13 # undef   DEBUG
  14 # define  DEBUG  0
  15 # include <aros/debug.h>
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <proto/dos.h>
  21
  22         AROS_LH3(struct DosList *, FindDosEntry,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(struct DosList *, dlist, D1),
  26         AROS_LHA(CONST_STRPTR,     name,  D2),
  27         AROS_LHA(ULONG,            flags, D3),
  28
  29 /*  LOCATION */
  30         struct DosLibrary *, DOSBase, 114, Dos)
  31
  32 /*  FUNCTION
  33         Looks for the next dos list entry with the right name. The list
  34         must be locked for this. There may be not more than one device
  35         or assign node of the same name. There are no restrictions on
  36         volume nodes.
  37
  38     INPUTS
  39         dlist - the value given by LockDosList() or the last call to
  40                 FindDosEntry().
  41         name  - logical device name without colon. Case insensitive.
  42         flags - the same flags as given to LockDosList() or a subset
  43                 of them.
  44
  45     RESULT
  46         Pointer to dos list entry found or NULL if the are no more entries.
  47
  48     NOTES
  49
  50     EXAMPLE
  51
  52     BUGS
  53
  54     SEE ALSO
  55
  56     INTERNALS
  57
  58 *****************************************************************************/
  59 {
  60     AROS_LIBFUNC_INIT
  61     AROS_LIBBASE_EXT_DECL(struct DosLibrary *,DOSBase)
  62
  63     static const ULONG flagarray[]=
  64     { 0, LDF_DEVICES, LDF_ASSIGNS, LDF_VOLUMES, LDF_ASSIGNS, LDF_ASSIGNS };
  65
  66     /* Determine the size of the name (-1 if the last character is a ':') */
  67     CONST_STRPTR end = name;
  68     ULONG size;
  69
  70     while (*end++)
  71         ;
  72
  73     size = ~(name-end);
  74
  75     if (size && end[-2] == ':')
  76     {
  77         size--;
  78     }
  79
  80     /* Follow the list */
  81     for (;;)
  82     {
  83         /* Get next entry. Return NULL if there is none. */
  84         dlist = dlist->dol_Next;
  85
  86         if (dlist == NULL)
  87         {
  88             return NULL;
  89         }
  90
  91         D(bug("Found list entry %s\n", dlist->dol_DevName));
  92
  93         /* Check type and name */
  94         if (flags & flagarray[dlist->dol_Type + 1] &&
  95             !Strnicmp(name, dlist->dol_DevName, size) &&
  96             !dlist->dol_DevName[size])
  97         {
  98             return dlist;
  99         }
 100     }
 101     AROS_LIBFUNC_EXIT
 102 } /* FindDosEntry */