disksize.c

   1 /*
   2  * disksize.c - Try to get the size of a disk.
   3  *
   4  * At present this relies on fseeko and such.  Could do something
   5  * smarter here like a binary search if this needs to be more portable.
   6  */
   7 #define _GNU_SOURCE
   8 #define _FILE_OFFSET_BITS 64
   9
  10 #include <stdio.h>
  11 #include "disksize.h"
  12
  13 int get_disk_size(char *device, u64 *size)
  14 {
  15         FILE *fp = fopen(device, "r");
  16         if (!fp)
  17                 return 0;
  18
  19         fseeko(fp, 0, SEEK_END);
  20         *size = ftello(fp);
  21         return 1;
  22 }