df.c

   1 #include <sys/statvfs.h>
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include <string.h>
   5 #include <sys/types.h>
   6 #include <errno.h>
   7
   8 #include "gcc-compat.h"
   9 #include "error.h"
  10 #include "string.h"
  11 #include "df.h"
  12
  13 int get_disk_space(const char *path, struct disk_space *result)
  14 {
  15         /* using floats allows to not care about integer overflows */
  16         float total_blocks, available_blocks, blocksize;
  17         float total_inodes, available_inodes;
  18
  19         struct statvfs vfs;
  20         int ret = statvfs(path, &vfs);
  21         if (ret < 0)
  22                 return -ERRNO_TO_DSS_ERROR(errno);
  23
  24         available_blocks = vfs.f_bavail;
  25         blocksize = vfs.f_bsize;
  26         total_blocks = vfs.f_blocks;
  27         total_inodes = vfs.f_files;
  28         available_inodes = vfs.f_ffree;
  29
  30         result->total_mb = total_blocks * blocksize / 1024.0 / 1024.0;
  31         result->free_mb =  available_blocks * blocksize / 1024.0 / 1024.0;
  32         result->percent_free = 100.0 * available_blocks / total_blocks + 0.5;
  33         result->percent_free_inodes = 100.0 * available_inodes / total_inodes + 0.5;
  34         return 1;
  35 }