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diff --git a/sys/imio/iki/ikiextn.x b/sys/imio/iki/ikiextn.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <ctype.h>
+include <imhdr.h>
+include "iki.h"
+
+# IKIEXTN.X -- Image extension handling.  This package is used to map image
+# file extensions to image types and vice versa.
+#
+#	       iki_extninit (imtype, def_imtype, imextn, def_imextn)
+#    status = iki_validextn (kernel, extn)
+#      status = iki_getextn (kernel, index, extn, maxch)
+#        value = iki_getpar (param)
+#
+# iki_extninit initializes the image extension handling package.  This parses
+# the lists of extensions and patterns and builds an internal descriptor which
+# will be used by the other routines for extension handling.  iki_validextn
+# tests whether a given extension is valid for a particular image kernel
+# (type of image).  iki_getextn is used with an index argument to get a list
+# of the extensions for a particular image type.  iki_getpar queries the value
+# of IKI global parameters.
+
+define	SZ_IMTYPE	128
+define	SZ_IMEXTN	1024
+
+
+# IKI_EXTNINIT -- Initialize the image extension handling package.  This is
+# typically done once when IKI is first initialized.  Changes to the image
+# typing environment made subsequently have no effect unless the package is
+# reinitialized.
+
+int procedure iki_extninit (env_imtype, def_imtype, env_imextn, def_imextn)
+
+char	env_imtype[ARB]			#I imtype environment variable
+char	def_imtype[ARB]			#I default imtype value string
+char	env_imextn[ARB]			#I imextn environment variable
+char	def_imextn[ARB]			#I default imextn value string
+
+int	kset[MAX_KERNELS]
+pointer	sp, ip, ip_save, imtype, imextn, strval
+int	op, delim, status, nchars, i, j, kernel
+int	envfind(), iki_getfield(), gstrcpy(), iki_validextn()
+bool	streq(), envgetb()
+
+include	"iki.com"
+
+begin
+	call smark (sp)
+	call salloc (imtype, SZ_IMTYPE, TY_CHAR)
+	call salloc (imextn, SZ_IMEXTN, TY_CHAR)
+	call salloc (strval, SZ_FNAME, TY_CHAR)
+
+	status = OK
+
+	# Get the imtype string.  The value of the env_imtype variable is used
+	# if the variable is found, otherwise the default is used.
+
+	Memc[imtype] = EOS
+	if (env_imtype[1] != EOS)
+	    if (envfind (env_imtype, Memc[imtype], SZ_IMTYPE) <= 0)
+		Memc[imtype] = EOS
+	if (Memc[imtype] == EOS)
+	    call strcpy (def_imtype, Memc[imtype], SZ_IMTYPE)
+
+	# Get the imextn string.  The value of the env_imextn variable is used
+	# if the variable is found, otherwise the default is used.
+
+	Memc[imextn] = EOS
+	if (env_imextn[1] != EOS)
+	    if (envfind (env_imextn, Memc[imextn], SZ_IMEXTN) <= 0)
+		Memc[imextn] = EOS
+	if (Memc[imextn] == EOS)
+	    call strcpy (def_imextn, Memc[imextn], SZ_IMEXTN)
+
+	# Process imextn.  This specifies the set of valid extensions for
+	# each image type.  This must be done before processing imtype below,
+	# since iki_validextn can be used when processing imtype.  The imextn
+	# string is of the form "<kernel>:<extn>[,<extn>...] ..." where 
+	# <kernel> is the IKI kernel name (k_kname) and <extn> is a regular
+	# expression to be used to test for a matching file extension.
+	# For example, imextn = "oif:imh stf:hhh,??h fits:,fits,fit".
+
+	k_nextn = 0
+	k_sbufused = 0
+	call aclri (kset, MAX_KERNELS)
+
+	# Process the user extension string first followed by the builtin
+	# defaults.  Anything given in the user string takes precedence
+	# while anything omitted uses the builtin defaults instead (if there
+	# is no user imextn this processes the default string twice).
+
+	do i = 1, 2 {
+	    if (i > 1)
+		call strcpy (def_imextn, Memc[imextn], SZ_IMEXTN)
+
+	    ip = imextn
+	    while (Memc[ip] != EOS && IS_WHITE(Memc[ip]))
+		ip = ip + 1
+
+	    repeat {
+		# Get the kernel name.
+		if (iki_getfield (ip, Memc[strval], SZ_FNAME, delim) <= 0)
+		    break
+		call strlwr (Memc[strval])
+		if (delim != ':') {
+		    status = ERR
+		    break
+		}
+
+		# Lookup kernel.
+		kernel = 0
+		do j = 1, k_nkernels {
+		    if (streq (Memc[strval], k_kname[1,j])) {
+			kernel = j
+			break
+		    }
+		}
+		if (kernel <= 0) {
+		    status = ERR
+		    break
+		}
+
+		# Process the list of extension patterns.
+		op = k_sbufused + 1
+		ip_save = ip
+
+		while (iki_getfield (ip, Memc[strval], SZ_FNAME, delim) > 0) {
+		    # call strlwr (Memc[strval])
+
+		    # Skip it if we already have something for this kernel.
+		    if (kset[kernel] == 0) {
+			# Get a new extension descriptor.
+			if (k_nextn >= MAX_IMEXTN) {
+			    status = ERR
+			    break
+			} else
+			    k_nextn = k_nextn + 1
+
+			# Save the kernel index associated with this extension.
+			k_kernel[k_nextn] = kernel
+
+			# Save the extension string.
+			k_extn[k_nextn] = op
+			nchars = gstrcpy(Memc[strval],k_sbuf[op],SZ_IKISBUF-op)
+			op = op + nchars + 1
+
+			# Save the strmatch pattern for the extension.
+			k_pattern[k_nextn] = op
+			k_sbuf[op] = '^';  op = op + 1
+			nchars = gstrcpy(Memc[strval],k_sbuf[op],SZ_IKISBUF-op)
+			op = op + nchars + 1
+		    }
+
+		    ip_save = ip
+		    if (delim != ',')
+			break
+		}
+
+		kset[kernel] = 1
+		k_sbufused = op - 1
+
+	    } until (Memc[ip] == EOS)
+	}
+
+	# Process imtype.  This sets the default image type for new images.
+	# For example, imtype = "oif,inherit" would create OIF (.imh) images
+	# by default, inheriting the old image type if a newcopy image is
+	# being written.
+
+	k_defimtype = 1
+	k_inherit = NO
+	ip = imtype
+	kernel = 0
+
+	while (iki_getfield (ip, Memc[strval], SZ_FNAME, delim) > 0) {
+	    call strlwr (Memc[strval])
+
+	    # Check for the inherit/noinherit keywords.
+	    if (streq (Memc[strval], "inherit")) {
+		k_inherit = YES
+		next
+	    }
+	    if (streq (Memc[strval], "noinherit")) {
+		k_inherit = NO
+		next
+	    }
+
+	    # Scan the kernels to see if we have a kernel name.
+	    if (kernel <= 0)
+		do i = 1, k_nkernels
+		    if (streq (Memc[strval], k_kname[1,i])) {
+			kernel = i
+			break
+		    }
+
+	    # Check for a valid imagefile extension.
+	    if (kernel <= 0)
+		kernel = iki_validextn (0, Memc[strval])
+	}
+
+	if (kernel <= 0)
+	    status = ERR
+	else
+	    k_defimtype = kernel
+
+	if (envgetb ("ikidebug"))
+	    call iki_debug ("IKI debug:", STDERR, 0)
+
+	call sfree (sp)
+	return (status)
+end
+
+
+# IKI_VALIDEXTN -- Determine if the given imagefile extension is valid for
+# the given image kernel (image type).  If kernel=0 the extensions for all
+# kernels are examined.  If a valid match is found the kernel index is
+# returned as the function value, otherwise 0 is returned.
+
+int procedure iki_validextn (kernel, extn)
+
+int	kernel				#I kernel index, zero for all kernels
+char	extn[ARB]			#I extension to be tested
+
+int	i, ip
+int	strmatch()
+include	"iki.com"
+
+begin
+	do i = 1, k_nextn
+	    if (kernel == 0 || k_kernel[i] == kernel) {
+		ip = strmatch (extn, k_sbuf[k_pattern[i]])
+		if (ip > 0 && extn[ip] == EOS)
+		    return (k_kernel[i])
+	    }
+
+	return (0)
+end
+
+
+# IKI_GETEXTN -- Get an entry from the list of valid extensions (actually
+# extension patterns) for the given image kernel.  If kernel=0 all entries
+# are returned.  The kernel index for the output extension is returned as
+# the function value.  ERR is returned if the requested extension does not
+# exist.
+
+int procedure iki_getextn (kernel, index, extn, maxch)
+
+int	kernel				#I kernel index, zero for all kernels
+int	index				#I extension number (1 indexed)
+char	extn[ARB]			#O extension
+int	maxch				#I max chars out
+
+int	i, n
+include	"iki.com"
+
+begin
+	n = 0
+	do i = 1, k_nextn
+	    if (kernel == 0 || k_kernel[i] == kernel) {
+		n = n + 1
+		if (index == n) {
+		    call strcpy (k_sbuf[k_extn[i]], extn, maxch)
+		    return (k_kernel[i])
+		}
+	    }
+
+	return (ERR)
+end
+
+
+# IKI_GETPAR -- Return the value of an IKI global parameter (integer valued).
+
+int procedure iki_getpar (param)
+
+char	param[ARB]			#I parameter name
+
+bool	streq()
+include	"iki.com"
+
+begin
+	if (streq (param, "inherit"))
+	    return (k_inherit)
+	else if (streq (param, "defimtype"))
+	    return (k_defimtype)
+end
+
+
+# IKI_GETFIELD -- Get the next field from a punctuation or whitespace
+# delimited list.  The length of the field is returned as the function value.
+# EOF is returned at the end of the list.  Zero can be returned if a field
+# is zero length, e.g. in "foo,,foo" the second field is zero length.
+
+int procedure iki_getfield (ip, outstr, maxch, delim)
+
+pointer	ip				#U string pointer
+char	outstr[ARB]			#O receives string
+int	maxch				#I max chars out
+int	delim				#O delimiter char
+
+int	op, ch
+
+begin
+	# Skip any leading whitespace.
+	while (Memc[ip] != EOS && IS_WHITE(Memc[ip]))
+	    ip = ip + 1
+
+	# Check for end of list.
+	if (Memc[ip] == EOS || Memc[ip] == '\n')
+	    return (EOF)
+
+	op = 1
+	for (ch=Memc[ip];  ch != EOS && !IS_WHITE(ch);  ch=Memc[ip]) {
+	    if (ch == ',' || ch == ':' || ch == ';')
+		break
+	    else {
+		outstr[op] = ch
+		op = op + 1
+	    }
+	    ip = ip + 1
+	}
+
+	delim = ch
+	if (delim != EOS)
+	    ip = ip + 1
+
+	outstr[op] = EOS
+	return (op - 1)
+end
+
+
+# IKI_DEBUG -- Print debug information on the IKI internal data structures.
+
+procedure iki_debug (str, fd, flags)
+
+char	str[ARB]			#I title string
+int	fd				#I output file
+int	flags				#I (not used)
+
+int	i
+include	"iki.com"
+
+begin
+	# Print global variables.
+	call fprintf (fd, "%s nkernels=%d sbufused=%d deftype=%d ")
+	    call pargstr (str)
+	    call pargi (k_nkernels)
+	    call pargi (k_sbufused)
+	    call pargi (k_defimtype)
+	call fprintf (fd, "inherit=%d nextn=%d\n")
+	    call pargi (k_inherit)
+	    call pargi (k_nextn)
+
+	# List the installed kernels.
+	call fprintf (fd, "installed kernels ")
+	do i = 1, k_nkernels {
+	    call fprintf (fd, "%s=%d ")
+		call pargstr (k_kname[1,i])
+		call pargi (i)
+	}
+	call fprintf (fd, "\n")
+	
+	# Print the extension table.
+	do i = 1, k_nextn {
+	    call fprintf (fd, "%6s %d (%s) %s\n")
+		call pargstr (k_sbuf[k_extn[i]])
+		call pargi (k_kernel[i])
+		call pargstr (k_kname[1,k_kernel[i]])
+		call pargstr (k_sbuf[k_pattern[i]])
+	}
+
+	call flush (fd)
+end