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   filesize

   Usage
   #include <io.h>
   long filesize(char *filename);

   Description
   filesize determines the size of a file in bytes. The filename must  be
   an existing file that is not currently open.

   Example
   #include <io.h>
   main()
   {
   long size;
        size = filesize ("file.dat");
        printf("The filesize of file.dat is %ld \n",size);
   }

   Return Value
   The length of the file in bytes is returned upon success, otherwise  a
   -1L is returned and errno is set.