lib/libhgfs/dir.c

   1 /* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
   2
   3 #include "inc.h"
   4
   5 /*===========================================================================*
   6  *                              hgfs_opendir                                 *
   7  *===========================================================================*/
   8 int hgfs_opendir(path, handle)
   9 char *path;
  10 sffs_dir_t *handle;
  11 {
  12 /* Open a directory. Store a directory handle upon success.
  13  */
  14   int r;
  15
  16   RPC_REQUEST(HGFS_REQ_OPENDIR);
  17
  18   path_put(path);
  19
  20   if ((r = rpc_query()) != OK)
  21         return r;
  22
  23   *handle = (sffs_dir_t)RPC_NEXT32;
  24
  25   return OK;
  26 }
  27
  28 /*===========================================================================*
  29  *                              hgfs_readdir                                 *
  30  *===========================================================================*/
  31 int hgfs_readdir(handle, index, buf, size, attr)
  32 sffs_dir_t handle;
  33 unsigned int index;
  34 char *buf;
  35 size_t size;
  36 struct sffs_attr *attr;
  37 {
  38 /* Read a directory entry from an open directory, using a zero-based index
  39  * number. Upon success, the resulting path name is stored in the given buffer
  40  * and the given attribute structure is filled selectively as requested. Upon
  41  * error, the contents of the path buffer and attribute structure are
  42  * undefined. ENOENT is returned upon end of directory.
  43  */
  44   int r;
  45
  46   RPC_REQUEST(HGFS_REQ_READDIR);
  47   RPC_NEXT32 = (u32_t)handle;
  48   RPC_NEXT32 = index;
  49
  50   /* EINVAL signifies end of directory. */
  51   if ((r = rpc_query()) != OK)
  52         return (r == EINVAL) ? ENOENT : OK;
  53
  54   attr_get(attr);
  55
  56   if ((r = path_get(buf, size)) != OK)
  57         return r;
  58
  59   /* VMware Player 3 returns an empty name, instead of EINVAL, when reading
  60    * from an EOF position right after opening the directory handle. Seems to be
  61    * a newly introduced bug..
  62    */
  63   return (!buf[0]) ? ENOENT : OK;
  64 }
  65
  66 /*===========================================================================*
  67  *                              hgfs_closedir                                *
  68  *===========================================================================*/
  69 int hgfs_closedir(handle)
  70 sffs_dir_t handle;
  71 {
  72 /* Close an open directory.
  73  */
  74
  75   RPC_REQUEST(HGFS_REQ_CLOSEDIR);
  76   RPC_NEXT32 = (u32_t)handle;
  77
  78   return rpc_query();
  79 }