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diff --git a/pkg/xtools/strdetab.x b/pkg/xtools/strdetab.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# STRDETAB -- Procedure to remove tabs from a line of text and replace with
+# blanks.
+
+procedure strdetab (line, outline, maxch, tabsize)
+
+int   ip, op, maxch, tabsize
+char  line[ARB], outline [ARB]
+
+begin
+	op=1
+	ip=1
+
+	while (line[ip] != EOS && op <= maxch) {
+	    if (line[ip] == '\t') {
+		repeat {
+		    outline[op] = ' '
+		    op = op + 1
+		} until ((mod (op, tabsize) == 1) || (op > maxch)) 
+	        ip = ip + 1
+	    } else {
+		outline[op] = line[ip]
+		op = op + 1
+		ip = ip + 1
+	    }
+	}
+
+	outline[op] = EOS
+end