1 files changed, 60 insertions, 0 deletions
diff --git a/sys/gio/cursor/grcread.x b/sys/gio/cursor/grcread.x
new file mode 100644
index 00000000..ce95fc07
--- /dev/null
+++ b/sys/gio/cursor/grcread.x
@@ -0,0 +1,60 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<fset.h>
+include	<gio.h>
+include	"gtr.h"
+
+# GRC_READ -- Fill the frame buffer from a metacode spool file and redraw
+# the screen.  The contents of the frame buffer are overwritten.
+
+procedure grc_read (tr, stream, fname)
+
+pointer	tr			# graphics descriptor
+int	stream			# graphics stream
+char	fname[ARB]		# metacode file
+
+pointer	sp, lbuf, op
+int 	fd, nchars, filelen
+long	fstatl()
+pointer	gtr_writep()
+int	open(), read()
+errchk	read
+define	err_ 91
+
+begin
+	call smark (sp)
+	call salloc (lbuf, SZ_LINE, TY_CHAR)
+
+	iferr (fd = open (fname, READ_ONLY, BINARY_FILE)) {
+	    call grc_message (stream, " - cannot open file")
+	    call sfree (sp)
+	    return
+	}
+
+	filelen = fstatl (fd, F_FILESIZE)
+	call sprintf (Memc[lbuf], SZ_LINE, " - file size %d chars")
+	    call pargi (filelen)
+	call grc_message (stream, Memc[lbuf])
+
+	# Discard the current frame.
+	call gtr_frame (tr, TR_FRAMEBUF(tr), stream)
+
+	# Read new frame buffer.
+	nchars = filelen
+	if (nchars <= 0)
+	    goto err_
+	op = gtr_writep (stream, nchars)
+	if (read (fd, Mems[op], nchars) < nchars)
+	    goto err_
+
+	# Redraw the new frame buffer.
+	call gtr_redraw (stream)
+
+	call close (fd)
+	call sfree (sp)
+	return
+err_
+	call close (fd)
+	call grc_message (stream, " [READ ERROR]")
+	call sfree (sp)
+end