lib/ext2fs/lookup.c

   1 /*
   2  * lookup.c --- ext2fs directory lookup operations
   3  *
   4  * Copyright (C) 1993, 1994, 1994, 1995 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #include <string.h>
  14 #if HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17
  18 #include "ext2_fs.h"
  19 #include "ext2fs.h"
  20
  21 struct lookup_struct  {
  22         const char      *name;
  23         int             len;
  24         ext2_ino_t      *inode;
  25         int             found;
  26 };
  27
  28 #ifdef __TURBOC__
  29  #pragma argsused
  30 #endif
  31 static int lookup_proc(struct ext2_dir_entry *dirent,
  32                        int      offset EXT2FS_ATTR((unused)),
  33                        int      blocksize EXT2FS_ATTR((unused)),
  34                        char     *buf EXT2FS_ATTR((unused)),
  35                        void     *priv_data)
  36 {
  37         struct lookup_struct *ls = (struct lookup_struct *) priv_data;
  38
  39         if (ls->len != (dirent->name_len & 0xFF))
  40                 return 0;
  41         if (strncmp(ls->name, dirent->name, (dirent->name_len & 0xFF)))
  42                 return 0;
  43         *ls->inode = dirent->inode;
  44         ls->found++;
  45         return DIRENT_ABORT;
  46 }
  47
  48
  49 errcode_t ext2fs_lookup(ext2_filsys fs, ext2_ino_t dir, const char *name,
  50                         int namelen, char *buf, ext2_ino_t *inode)
  51 {
  52         errcode_t       retval;
  53         struct lookup_struct ls;
  54
  55         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  56
  57         ls.name = name;
  58         ls.len = namelen;
  59         ls.inode = inode;
  60         ls.found = 0;
  61
  62         retval = ext2fs_dir_iterate(fs, dir, 0, buf, lookup_proc, &ls);
  63         if (retval)
  64                 return retval;
  65
  66         return (ls.found) ? 0 : EXT2_ET_FILE_NOT_FOUND;
  67 }
  68
  69