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diff --git a/sys/imio/db/idbfstr.x b/sys/imio/db/idbfstr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+
+
+# IDB_FILSTR -- Filter a string, removing any tabs or control characters.
+# This is used to clean up strings we want to put in image headers.  A count
+# of the output, filtered string is returned as the function value.  Tabs or
+# newlines in the input are replaced by blanks.  Illegal or unprintable
+# control characters in the input are deleted.
+
+int procedure idb_filstr (s1, s2, maxch)
+
+char	s1[ARB]				#I input string
+char	s2[ARB]				#O output string
+int	maxch				#I max chars out
+
+int	op, ch, i
+
+begin
+	op = 1
+
+	do i = 1, ARB {
+	    ch = s1[i]
+	    if (ch == EOS)
+		break
+	    else if (ch == '\t' || ch == '\n')
+		ch = ' '
+	    else if (!IS_PRINT (ch))
+		next
+
+	    s2[op] = ch
+	    op = op + 1
+	    if (op > maxch)
+		break
+	}
+
+	s2[op] = EOS
+	return (op - 1)
+end