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diff --git a/sys/imfort/imfparse.x b/sys/imfort/imfparse.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"oif.h"
+
+# IMF_PARSE -- Parse an image name into the root pathname and filename
+# extension, if any.  Only the known image type extensions are recognized
+# as extensions, hence this routine cannot be used to parse general filenames.
+
+procedure imf_parse (image, root, extn)
+
+char	image[ARB]		# input image name
+char	root[SZ_PATHNAME]	# output root pathname
+char	extn[MAX_LENEXTN]	# output extension
+
+int	delim, ip, op
+pointer	sp, pattern, osfn
+int	strmatch(), strlen()
+string	ex HDR_EXTENSIONS
+
+begin
+	call smark (sp)
+	call salloc (pattern, SZ_FNAME, TY_CHAR)
+	call salloc (osfn, SZ_PATHNAME, TY_CHAR)
+
+	# Parse the image name into the root and extn fields.  The portion
+	# of the filename excluding any directory specification is also
+	# escape sequence encoded.
+
+	call imf_trans (image, root, extn)
+
+	# Search the list of legal imagefile extensions.  If the extension
+	# given is not found in the list, tack it back onto the root and
+	# return a null extension.  This is necessary if we are to allow
+	# dot delimited fields within image names without requiring the
+	# user to supply the image type extension.  For example, "im.c"
+	# and "im.c.imh" must refer to the same image - ".c" is part of
+	# the image name, not an image type extension.
+	#
+	# Note - EX is a string of the form "|imh|hhh|...|". (iki.h).
+
+	if (strlen(extn) == LEN_EXTN) {
+	    delim = ex[1]
+	    for (ip=2;  ex[ip] != EOS;  ip=ip+1) {
+		op = pattern
+		while (ex[ip] != delim && ex[ip+1] != EOS) {
+		    Memc[op] = ex[ip]
+		    op = op + 1
+		    ip = ip + 1
+		}
+		Memc[op] = EOS
+		if (strmatch (extn, Memc[pattern]) > 0) {
+		    call sfree (sp)
+		    return
+		}
+	    }
+	}
+
+	# Not a legal image header extension.  Restore the extn field to the
+	# root and null the extn.  Tacking on the dummy extension .foo and
+	# later discarding it ensures that the root name is properly encoded
+	# for the local host.
+
+	if (strlen(extn) > 0) {
+	    call strcpy (image, Memc[osfn], SZ_PATHNAME)
+	    call strcat (".foo", Memc[osfn], SZ_PATHNAME)
+	    call imf_trans (Memc[osfn], root, extn)
+	    extn[1] = EOS
+	}
+
+	call sfree (sp)
+end