core/fs/readdir.c

   1 #include <fcntl.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <sys/dirent.h>
   5 #include "fs.h"
   6 #include "core.h"
   7
   8 /*
   9  * Open a directory
  10  */
  11 __export DIR *opendir(const char *path)
  12 {
  13     int rv;
  14     struct file *file;
  15
  16     rv = searchdir(path, O_RDONLY|O_DIRECTORY);
  17     if (rv < 0)
  18         return NULL;
  19
  20     file = handle_to_file(rv);
  21
  22     if (file->inode->mode != DT_DIR) {
  23         _close_file(file);
  24         return NULL;
  25     }
  26
  27     return (DIR *)file;
  28 }
  29
  30 /*
  31  * Read one directory entry at one time.
  32  */
  33 __export struct dirent *readdir(DIR *dir)
  34 {
  35     static struct dirent buf;
  36     struct file *dd_dir = (struct file *)dir;
  37     int rv = -1;
  38
  39     if (dd_dir) {
  40         if (dd_dir->fs->fs_ops->readdir) {
  41             rv = dd_dir->fs->fs_ops->readdir(dd_dir, &buf);
  42         }
  43     }
  44
  45     return rv < 0 ? NULL : &buf;
  46 }
  47
  48 /*
  49  * Close a directory
  50  */
  51 __export int closedir(DIR *dir)
  52 {
  53     struct file *dd_dir = (struct file *)dir;
  54     _close_file(dd_dir);
  55     return 0;
  56 }
  57
  58