Initial commit

1 files changed, 44 insertions, 0 deletions

diff --git a/sys/imfort/imgl1s.x b/sys/imfort/imgl1s.x
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+++ b/sys/imfort/imgl1s.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	"imfort.h"
+
+# IMGL1S -- Get a line from an image of type short.  It is illegal to reference
+# out of bounds.
+
+procedure imgl1s (im, buf, ier)
+
+pointer	im			# image descriptor
+short	buf[ARB]		# user data buffer
+int	ier
+
+long	offset
+int	nchars, npix
+int	bfread()
+
+begin
+	# Verify that 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 * IM_SZPIXEL(im)
+
+	# Compute offset into pixel file.
+	offset = IM_PIXOFF(im)
+
+	# Read one line of data.
+	if (nchars != bfread (IM_PIXFP(im), buf, nchars, offset)) {
+	    ier = IE_RDPIX
+	    call im_seterrim (ier, im)
+	    return
+	}
+
+	# Swap bytes if necessary.
+	call imswap (im, buf, nchars)
+
+	ier = OK
+end