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diff --git a/pkg/xtools/skywcs/skwrdstr.x b/pkg/xtools/skywcs/skwrdstr.x
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+
+# SK_WRDSTR -- Search a dictionary string for a given string index number.
+# This is the opposite function of strdic(), that returns the index for
+# given string.  The entries in the dictionary string are separated by
+# a delimiter character which is the first character of the dictionary
+# string.  The index of the string found is returned as the function value.
+# Otherwise, if there is no string for that index, a zero is returned.
+
+int procedure sk_wrdstr (index, outstr, maxch, dict)
+
+int     index                   #I the string index
+char    outstr[ARB]             #O the output string as found in dictionary
+int     maxch                   #I the maximum length of output string
+char    dict[ARB]               #I the dictionary string
+
+int     i, len, start, count
+
+int     strlen()
+
+begin
+        # Clear output string
+        outstr[1] = EOS
+
+        # Return if the dictionary is not long enough
+        if (dict[1] == EOS)
+            return (0)
+
+        # Initialize counters
+        count = 1
+        len   = strlen (dict)
+
+        # Search the dictionary string. This loop only terminates
+        # successfully if the index is found. Otherwise the procedure
+        # returns with and error condition.
+        for (start = 2; count < index; start = start + 1) {
+            if (dict[start] == dict[1])
+                count = count + 1
+            if (start == len)
+                return (0)
+        }
+
+        # Extract the output string from the dictionary
+        for (i = start; dict[i] != EOS && dict[i] != dict[1]; i = i + 1) {
+            if (i - start + 1 > maxch)
+                break
+            outstr[i - start + 1] = dict[i]
+        }
+
+        outstr[i - start + 1] = EOS
+
+        # Return index for output string
+        return (count)
+end