1 files changed, 69 insertions, 0 deletions
diff --git a/sys/imfort/impl2r.x b/sys/imfort/impl2r.x
new file mode 100644
index 00000000..a837a92a
--- /dev/null
+++ b/sys/imfort/impl2r.x
@@ -0,0 +1,69 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	"imfort.h"
+
+# IMPL2R -- Put a line to an image of type short or real.  Automatic
+# datatype conversion from real to short is performed if necessary.
+# It is illegal to reference out of bounds.
+
+procedure impl2r (im, buf, lineno, ier)
+
+pointer	im			# image descriptor
+real	buf[ARB]		# user data buffer
+int	lineno			# line number
+int	ier
+
+pointer	bp
+long	offset
+int	nchars, npix
+int	imwpix()
+errchk	malloc
+
+begin
+	# Verify in bounds.
+	if (lineno < 1 || lineno > IM_LEN(im,2)) {
+	    ier = IE_YOOB
+	    call im_seterrim (ier, im)
+	    return
+	}
+
+	# Need an extra line buffer for the type conversion in this case.
+	if (IM_PIXTYPE(im) == TY_SHORT) {
+	    bp = IM_LINEBUFP(im)
+	    if (bp == NULL) {
+		call malloc (bp, IM_LEN(im,1), TY_SHORT)
+		IM_LINEBUFP(im) = bp
+	    }
+	}
+
+	npix = IM_LEN(im,1)
+	nchars = npix * IM_SZPIXEL(im)
+
+	# Compute offset into pixel file.
+	offset = IM_PIXOFF(im) + (lineno-1) * IM_LINESIZE(im)
+
+	if (IM_PIXTYPE(im) == TY_SHORT) {
+	    # Convert the pixels from real to short before writing to the
+	    # pixel file.
+
+	    call achtrs (buf, Mems[bp], npix)
+
+	    # Write one line of data.
+	    if (nchars != imwpix (im, Mems[bp], nchars, offset, 1)) {
+		ier = IE_WRPIX
+		call im_seterrim (ier, im)
+		return
+	    }
+
+	} else {
+	    # Write one line of data.
+	    if (nchars != imwpix (im, buf, nchars, offset, 0)) {
+		ier = IE_WRPIX
+		call im_seterrim (ier, im)
+		return
+	    }
+	}
+
+	ier = OK
+end