-SeekOffset sys_seek(Handle &handle, SeekOffset offset, SeekType type)
-{
-#ifdef WIN32
- LONG high = offset>>32;
- DWORD ret = SetFilePointer(*handle, offset, &high, sys_seek_type(type));
- if(ret==INVALID_SET_FILE_POINTER)
- {
- DWORD err = GetLastError();
- if(err!=NO_ERROR)
- throw system_error("SetFilePointer");
- }
-
- return (SeekOffset(high)<<32) | ret;
-#else
- off64_t ret = lseek64(*handle, offset, sys_seek_type(type));
- if(ret==(off64_t)-1)
- throw system_error("lseek64");
-
- return ret;
-#endif
-}
+bad_seek::bad_seek(SeekOffset offset, SeekType type):
+ runtime_error(type==S_BEG ? lexical_cast<string>(offset) :
+ type==S_CUR ? format("CUR%+d", offset) :
+ type==S_END ? format("END%+d", offset) :
+ format("SeekType(%d)", type))
+{ }