4.4BSD snapshot (revision 8.1); add 1993 to copyright

written by Kirk McKusick; add Berkeley specific copyright notice

update from John Gilmore for gcc

semantic cleanup of UNSYNC()

PERROR is missing an argument

put in checking for overflow/underflow

move the text of error messages from ERROR to the functions
which generate them.

merge in onyx changes

clear EOLN so that partial last lines can be detected

check for EOF after data read

date and time created 80/10/30 00:34:38 by mckusick