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diff --git a/pkg/tbtables/tbhfcm.x b/pkg/tbtables/tbhfcm.x
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+include <ctype.h>		# defines IS_WHITE
+include <tbset.h>
+
+# tbhfcm -- find a comment in a header parameter string
+# This locates the comment, if present, in a text string containing a
+# header parameter.
+# The returned value of index will be zero if no comment was found.
+# If a comment was found, par[index] will be the first character of
+# the comment.
+# The input string should be the complete parameter record; that is,
+# it includes the keyword name, data type, value, and optional comment.
+#
+# Phil Hodge,  6-Mar-1995  Subroutine created.
+# Phil Hodge, 12-May-1995  Check for both ' and " as string delimiter.
+
+procedure tbhfcm (par, index)
+
+char	par[ARB]	# i: string containing header parameter
+int	index		# o: index of beginning of comment, or zero
+#--
+pointer sp
+pointer word		# scratch for the parameter value
+int	ip, nchar, ctowrd()
+int	strlen()
+
+begin
+	index = 0				# initial value
+
+	if (strlen (par) < START_OF_VALUE)
+	    return
+
+	# If a parameter of type text does not begin with a quote,
+	# it doesn't have an associated comment.
+	if (par[LOCN_DTYPE] == 't') {
+	    if (par[START_OF_VALUE] != '"' && par[START_OF_VALUE] != '\'')
+		return
+	}
+
+	call smark (sp)
+	call salloc (word, SZ_PARREC, TY_CHAR)
+
+	# Skip over the value.
+	ip = START_OF_VALUE
+	nchar = ctowrd (par, ip, Memc[word], SZ_PARREC)
+
+	# Check whether anything follows the value.  Skip whitespace.
+	while (IS_WHITE(par[ip]))
+	    ip = ip + 1
+
+	# If there is a comment, set index to the first character
+	# of the comment.
+	if (par[ip] != EOS)
+	    index = ip
+
+	call sfree (sp)
+end