1 files changed, 50 insertions, 0 deletions
diff --git a/sys/etc/miireadc.x b/sys/etc/miireadc.x
new file mode 100644
index 00000000..9354307c
--- /dev/null
+++ b/sys/etc/miireadc.x
@@ -0,0 +1,50 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mii.h>
+
+# MIIREADC -- Read a block of character data stored externally in MII format.
+# Data is returned in the machine independent character format.
+
+int procedure mii_readc (fd, spp, maxchars)
+
+int	fd			# input file
+int	spp[ARB]		# receives data
+int	maxchars		# max number of chars to be read
+
+pointer	sp, bp
+int	pksize, nchars
+int	miipksize(), miinelem(), read()
+errchk	read()
+
+long	note()
+
+begin
+	pksize = miipksize (maxchars, MII_BYTE)
+	nchars = max (maxchars, pksize)
+
+	if (nchars > maxchars) {
+	    # Read data into local buffer and unpack into user buffer.
+
+	    call smark (sp)
+	    call salloc (bp, nchars, TY_CHAR)
+
+	    nchars = read (fd, Memc[bp], pksize)
+	    if (nchars != EOF) {
+		nchars = min (maxchars, miinelem (nchars, MII_BYTE))
+		call miiupk8 (Memc[bp], spp, nchars, TY_CHAR)
+	    }
+
+	    call sfree (sp)
+	
+	} else {
+	    # Read data into user buffer and unpack in place.
+
+	    nchars = read (fd, spp, pksize)
+	    if (nchars != EOF) {
+		nchars = min (maxchars, miinelem (nchars, MII_BYTE))
+		call miiupk8 (spp, spp, nchars, TY_CHAR)
+	    }
+	}
+
+	return (nchars)
+end