git.sur5r.net Git - cc65/blob - libsrc/apple2/rewinddir.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                               rewinddir.c                                 */
   4 /*                                                                           */
   5 /*                          Reset directory stream                           */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2005  Oliver Schmidt, <ol.sc@web.de>                                  */
  10 /*                                                                           */
  11 /*                                                                           */
  12 /* This software is provided 'as-is', without any expressed or implied       */
  13 /* warranty.  In no event will the authors be held liable for any damages    */
  14 /* arising from the use of this software.                                    */
  15 /*                                                                           */
  16 /* Permission is granted to anyone to use this software for any purpose,     */
  17 /* including commercial applications, and to alter it and redistribute it    */
  18 /* freely, subject to the following restrictions:                            */
  19 /*                                                                           */
  20 /* 1. The origin of this software must not be misrepresented; you must not   */
  21 /*    claim that you wrote the original software. If you use this software   */
  22 /*    in a product, an acknowledgment in the product documentation would be  */
  23 /*    appreciated but is not required.                                       */
  24 /* 2. Altered source versions must be plainly marked as such, and must not   */
  25 /*    be misrepresented as being the original software.                      */
  26 /* 3. This notice may not be removed or altered from any source              */
  27 /*    distribution.                                                          */
  28 /*                                                                           */
  29 /*****************************************************************************/
  30
  31
  32
  33 #include <stdio.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36 #include <dirent.h>
  37 #include "dir.h"
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Code                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 void __fastcall__ rewinddir (register DIR* dir)
  48 {
  49     /* Rewind directory file */
  50     if (lseek (dir->fd, 0, SEEK_SET)) {
  51
  52         /* Read directory key block */
  53         if (read (dir->fd,
  54                   dir->block.bytes,
  55                   sizeof (dir->block)) == sizeof (dir->block)) {
  56
  57             /* Skip directory header entry */
  58             dir->current_entry = 1;
  59
  60             /* Return success */
  61             return;
  62         }
  63     }
  64
  65     /* Assert that no subsequent readdir() finds an active entry */
  66     memset (dir->block.bytes, 0, sizeof (dir->block));
  67
  68     /* Return failure */
  69 }