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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="SAFECHARS" id="SAFECHARS">6.12.
Fixing Bad Control Files and Metacharacters</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">safe_chars=</tt><span class=
"emphasis"><i class="EMPHASIS">additional safe characters
for control file</i></span></p>
</li>
</ul>
<p>RFC1179 defines a simple protocol and standard for print
jobs to be interchanged between print spooling systems.
Unfortunately, there were some major mistakes in not specifying
the exact form that text would take when placed in the control
file.</p>
<p>By default, <b class="APPLICATION">LPRng</b> will brutally
convert a non-conforming RFC1179 control file into one that is
acceptable to most, if not all, existing RFC1179
implementations. In order to prevent problems with <b class=
"APPLICATION">LPRng</b> ruthlessly purges all characters but
upper and lower case letters, spaces, tabs, and <tt class=
"LITERAL">-_.@/:()=,+-%</tt> from the control file, replacing
suspicious characters with underscore (<tt class=
"LITERAL">_</tt>). In addition, <b class=
"APPLICATION">LPRng</b> will ruthlessly regenerate control file
entries and data file names so that they are compliant with all
known RFC1179 implementations.</p>
<p>For some installations, the default set of safe characters
may be overly restrictive. For example, <span class=
"emphasis"><i class="EMPHASIS">vintage</i></span> software may
generate files with <tt class="LITERAL">#</tt> characters in
the <tt class="LITERAL">J</tt> line of the control file. The
replacement of this character by underscore (<tt class=
"LITERAL">_</tt>) may cause other applications which use the
control file information to stop working. The <tt class=
"LITERAL">:safe_chars</tt> option allows the user to specify an
additional set of safe characters in the <tt class=
"FILENAME">lpd.conf</tt> configuration file(s).</p>
<p>For example, <tt class="LITERAL">:safe_chars=#"</tt> would
allow the <tt class="LITERAL">#</tt> and <tt class=
"LITERAL">"</tt> characters to appear in the control file.</p>
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