fs/ext2/ext2_open.c

   1 /*
   2  *
   3  * (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
   4  *
   5  * This file has been copied from EMILE, http://emile.sf.net
   6  *
   7  */
   8
   9 #include "libext2.h"
  10 #include "ext2.h"
  11 #include "ext2_utils.h"
  12
  13 ext2_FILE* ext2_open(ext2_VOLUME *volume, const char* pathname)
  14 {
  15         ext2_FILE *file;
  16         struct ext2_inode *inode;
  17         int ino;
  18         int ret;
  19
  20         ino = ext2_seek_name(volume, pathname);
  21         if (ino == 0)
  22                 return NULL;
  23
  24         inode = (struct ext2_inode*)malloc(sizeof(struct ext2_inode));
  25         if (inode == NULL)
  26                 return NULL;
  27
  28         ret = ext2_get_inode(volume, ino, inode);
  29         if (ret == -1) {
  30                 free(inode);
  31                 return NULL;
  32         }
  33         if (S_ISLNK(inode->i_mode)) {
  34                 static char buffer[1024];
  35                 int i, last = 0;
  36                 strcpy(buffer, pathname);
  37                 for (i = 0; buffer[i]; i++)
  38                         if (buffer[i] == '\\')
  39                                 last = i;
  40                 buffer[last] = '\\';
  41                 strcpy(buffer + last + 1, (char*)inode->i_block);
  42                 ino = ext2_seek_name((ext2_VOLUME*)volume, buffer);
  43                 if (ino == 0) {
  44                         free(inode);
  45                         return NULL;
  46                 }
  47                 ret = ext2_get_inode((ext2_VOLUME*)volume, ino, inode);
  48                 if (ret == -1) {
  49                         free(inode);
  50                         return NULL;
  51                 }
  52         }
  53
  54         file = (ext2_FILE*)malloc(sizeof(ext2_FILE));
  55         if (file == NULL) {
  56                 free(inode);
  57                 return NULL;
  58         }
  59         file->volume = volume;
  60         file->inode = inode;
  61         file->offset = 0;
  62         file->path = strdup(pathname);
  63
  64         return file;
  65 }