EOVERFLOW in fseek()

[Sebastian Huber]

Hi,

in "newlib/libc/stdio/fseek.c" we have:

[...]
   /*
    * We are reading; we can try to optimise.
    * Figure out where we are going and where we are now.
    */

   if (whence == SEEK_SET)
     target = offset;
   else
     {
#ifdef __USE_INTERNAL_STAT64
       if (_fstat64_r (ptr, fp->_file, &st))
#else
       if (_fstat_r (ptr, fp->_file, &st))
#endif
	goto dumb;
       target = st.st_size + offset;
     }
   if ((long)target != target)
     {
       ptr->_errno = EOVERFLOW;
       _newlib_flockfile_exit (fp);
       return EOF;
     }
[...]

In "target = st.st_size + offset" we may have a signed integer overflow. 
Shouldn't this lead to an EOVERFLOW error?

-- 
Sebastian Huber, embedded brains GmbH

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