1 files changed, 50 insertions, 0 deletions
diff --git a/sys/etc/miiread.gx b/sys/etc/miiread.gx
new file mode 100644
index 00000000..a3efff2d
--- /dev/null
+++ b/sys/etc/miiread.gx
@@ -0,0 +1,50 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mii.h>
+
+# MIIREAD -- Read a block of data stored externally in MII format.
+# Data is returned in the format of the local host machine.
+
+int procedure mii_read$t (fd, spp, maxelem)
+
+int	fd			#I input file
+PIXEL	spp[ARB]		#O receives data
+int	maxelem			# max number of data elements to be read
+
+pointer	sp, bp
+int	pksize, nchars, nelem
+int	miipksize(), miinelem(), read()
+errchk	read()
+
+long	note()
+
+begin
+	pksize = miipksize (maxelem, MII_PIXEL)
+	nelem  = EOF
+
+	if (pksize > maxelem * SZ_PIXEL) {
+	    # Read data into local buffer and unpack into user buffer.
+
+	    call smark (sp)
+	    call salloc (bp, pksize, TY_CHAR)
+
+	    nchars = read (fd, Memc[bp], pksize)
+	    if (nchars != EOF) {
+		nelem = min (maxelem, miinelem (nchars, MII_PIXEL))
+		call miiupk$t (Memc[bp], spp, nelem, TY_PIXEL)
+	    }
+
+	    call sfree (sp)
+	
+	} else {
+	    # Read data into user buffer and unpack in place.
+
+	    nchars = read (fd, spp, pksize)
+	    if (nchars != EOF) {
+		nelem = min (maxelem, miinelem (nchars, MII_PIXEL))
+		call miiupk$t (spp, spp, nelem, TY_PIXEL)
+	    }
+	}
+
+	return (nelem)
+end