Initial commit

1 files changed, 37 insertions, 0 deletions

diff --git a/sys/fio/ffilbf.x b/sys/fio/ffilbf.x
new file mode 100644
index 00000000..8948ce89
--- /dev/null
+++ b/sys/fio/ffilbf.x
@@ -0,0 +1,37 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<config.h>
+include	<fio.h>
+
+# FFILBF -- Called by FFAULT to fill the file buffer for a binary file.
+
+procedure ffilbf (fd, bp, bufsize, buffer_offset)
+
+int	fd, bufsize
+pointer	bp
+bool	at_eof, stream_dev
+long	buffer_offset
+errchk	fwatio
+include	<fio.com>
+
+begin
+	fp = fiodes[fd]
+
+	if (FBUFMODE(fp) != INACTIVE)
+	    call fwatio (fd)
+
+	# If streaming device, read unconditionally, otherwise if
+	# positioned at EOF, initialize buffer pointers and return,
+	# else initiate read to fill buffer from file and return.
+
+	stream_dev = (FBLKSIZE(fp) == 0)
+	at_eof = (FILSIZE(fp) >= 0 && buffer_offset > FILSIZE(fp))
+
+	if (!stream_dev && at_eof) {
+	    itop[fd] = bufptr[fd]
+	    otop[fd] = bufptr[fd]
+	} else {
+	    call aread (fd, Memc[bp], bufsize, buffer_offset)
+	    FBUFMODE(fp) = READ_IN_PROGRESS
+	}
+end