Description: use EXSLT "replace" function when available

 A recursive implementation  of string.subst is problematic,

 long strings with many matches will cause stack overflows.

Author: Peter De Wachter <pdewacht@gmail.com>

Bug-Debian: https://bugs.debian.org/750593

--- docbook-xsl-1.78.1+dfsg.orig/docbook-xsl/lib/lib.xsl

+++ docbook-xsl-1.78.1+dfsg/docbook-xsl/lib/lib.xsl

@@ -10,7 +10,10 @@

      This module implements DTD-independent functions

      ******************************************************************** -->

-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

+                xmlns:str="http://exslt.org/strings"

+                exclude-result-prefixes="str"

+                version="1.0">

 <xsl:template name="dot.count">

   <!-- Returns the number of "." characters in a string -->

@@ -56,6 +59,9 @@

   <xsl:param name="replacement"/>

   <xsl:choose>

+    <xsl:when test="function-available('str:replace')">

+      <xsl:value-of select="str:replace($string, string($target), string($replacement))"/>

+    </xsl:when>

     <xsl:when test="contains($string, $target)">

       <xsl:variable name="rest">

         <xsl:call-template name="string.subst">