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