This is a portable library for performing stream I/O. It provides similar functionality to the ANSI C Standard I/O functions collectively known as Stdio. However, it is generally faster and more robust than most Stdio implementations. This version of the library has been ported to all known UNIX platforms including various flavors of IRIX, SUNOS, Solaris, Ultrix, MVS/OpenEdition, Linux and BSDI. The library handles 64-bit streams on platforms that support 64-bit files. A set of regression tests is available in the subdirectory $(WRKDIR)/src/lib/sfio/Sfio_t. These tests can be exercised by running the shell script runtest after building the library. See $(WRKDIR)/NOTICE/sfio.notice for copyright.