1 files changed, 50 insertions, 0 deletions
diff --git a/sys/imfort/impl2s.x b/sys/imfort/impl2s.x
new file mode 100644
index 00000000..27f77731
--- /dev/null
+++ b/sys/imfort/impl2s.x
@@ -0,0 +1,50 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	"imfort.h"
+
+# IMPL2S -- Put a line to a 2 dimensional image of type short.
+# No automatic datatype conversion is performed.  It is illegal to reference
+# out of bounds.
+
+procedure impl2s (im, buf, lineno, ier)
+
+pointer	im			# image descriptor
+short	buf[ARB]		# user data buffer
+int	lineno			# line number
+int	ier
+
+long	offset
+int	nchars, npix
+int	imwpix()
+
+begin
+	# Verify in bounds.
+	if (lineno < 1 || lineno > IM_LEN(im,2)) {
+	    ier = IE_YOOB
+	    call im_seterrim (ier, im)
+	    return
+	}
+
+	# Verify the image is of type short.
+	if (IM_PIXTYPE(im) != TY_SHORT) {
+	    ier = IE_NOTSHORT
+	    call im_seterrim (ier, im)
+	    return
+	}
+
+	npix = IM_LEN(im,1)
+	nchars = npix * SZ_SHORT
+
+	# Compute offset into pixel file.
+	offset = IM_PIXOFF(im) + (lineno-1) * IM_LINESIZE(im)
+
+	# 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