+void
+checked_fwrite (void const * ptr, size_t size, FILE* stream, boost::filesystem::path path)
+{
+ size_t N = fwrite (ptr, 1, size, stream);
+ if (N != size) {
+ if (ferror(stream)) {
+ fclose (stream);
+ throw FileError (String::compose("fwrite error %1", errno), path);
+ } else {
+ fclose (stream);
+ throw FileError ("Unexpected short write", path);
+ }
+ }
+}
+