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diff --git a/pkg/xtools/gstrentab.x b/pkg/xtools/gstrentab.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# GSTRENTAB -- Procedure to replace blanks with tabs and blanks.
+
+int procedure  gstrentab (line, outline, maxch, tabs)
+
+int   maxch, tabs[ARB]
+char  line[ARB], outline[ARB]
+
+int   ip, op, ltab
+
+begin
+	op = 1
+	ip = 1
+
+	repeat {
+	    ltab = ip
+	    while (line[ltab] == ' ' && op <= maxch) {
+		ltab = ltab + 1
+		if (tabs[ltab] == YES) {
+		    outline[op] = '\t'
+		    ip = ltab
+		    op = op + 1
+		}
+	    }
+	    for (; ip < ltab && op <= maxch; ip = ip + 1) {
+		outline[op] = ' '
+		op = op + 1
+	    }
+	    if (line[ip] == EOS || op >= maxch +1)
+		break
+	    outline[op] = line[ip]
+	    op = op + 1
+	    ip = ip + 1
+	} until (line[ip] == EOS || op >= maxch+1)
+
+	outline[op] = EOS
+	return (op-1)
+end
+