release/src/router/busybox/e2fsprogs/ext2fs/lookup.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * lookup.c --- ext2fs directory lookup operations
   4  *
   5  * Copyright (C) 1993, 1994, 1994, 1995 Theodore Ts'o.
   6  *
   7  * %Begin-Header%
   8  * This file may be redistributed under the terms of the GNU Public
   9  * License.
  10  * %End-Header%
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #if HAVE_UNISTD_H
  16 #include <unistd.h>
  17 #endif
  18
  19 #include "ext2_fs.h"
  20 #include "ext2fs.h"
  21
  22 struct lookup_struct  {
  23         const char      *name;
  24         int             len;
  25         ext2_ino_t      *inode;
  26         int             found;
  27 };
  28
  29 #ifdef __TURBOC__
  30 # pragma argsused
  31 #endif
  32 static int lookup_proc(struct ext2_dir_entry *dirent,
  33                        int      offset EXT2FS_ATTR((unused)),
  34                        int      blocksize EXT2FS_ATTR((unused)),
  35                        char     *buf EXT2FS_ATTR((unused)),
  36                        void     *priv_data)
  37 {
  38         struct lookup_struct *ls = (struct lookup_struct *) priv_data;
  39
  40         if (ls->len != (dirent->name_len & 0xFF))
  41                 return 0;
  42         if (strncmp(ls->name, dirent->name, (dirent->name_len & 0xFF)))
  43                 return 0;
  44         *ls->inode = dirent->inode;
  45         ls->found++;
  46         return DIRENT_ABORT;
  47 }
  48
  49
  50 errcode_t ext2fs_lookup(ext2_filsys fs, ext2_ino_t dir, const char *name,
  51                         int namelen, char *buf, ext2_ino_t *inode)
  52 {
  53         errcode_t       retval;
  54         struct lookup_struct ls;
  55
  56         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  57
  58         ls.name = name;
  59         ls.len = namelen;
  60         ls.inode = inode;
  61         ls.found = 0;
  62
  63         retval = ext2fs_dir_iterate(fs, dir, 0, buf, lookup_proc, &ls);
  64         if (retval)
  65                 return retval;
  66
  67         return (ls.found) ? 0 : EXT2_ET_FILE_NOT_FOUND;
  68 }