Stop one lseek(2) per header fetched by m_getfld.c in common case. Only call ftello(3) in enter_getfld() when track_filepos has been requested;  not often.
Stop one lseek(2) per header fetched by m_getfld.c in common case.
Only call ftello(3) in enter_getfld() when track_filepos has been
requested;  not often.

mcr/nmh,mcr/nmh