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<h3 class="SubSectionHead"><a
name="QQ1-42-36"></a>Placement of the Bookkeeping File</h3>
<!--l. 5947--><p class="noindent"><a
name="index42-36001"></a> <a
name="index42-36002"></a> <a
name="index42-36003"></a> <a
name="index42-36004"></a><a
name="TEX4HTWR"></a>To cut down on the time invested to locate files, the <span class="cmtt-10">tex4ht.c </span>program maintains a bookkeeping file where it
records the addresses of the files it finds. Whenever the program needs to locate a file, it first searches the address in
the bookkeeping file. If it doesn’t find the address there, the program embarks on a search throughout the physical
directories of its platform.
</p><!--l. 5959--><p class="indent"> The program places the bookkeeping file at the first applicable location of the following list.
</p><!--l. 5962--><p class="indent">
</p><ol type="1" >
<li>The pointer specified by an optional ‘<span class="cmtt-10">-l</span>’ switch provided to the invocation of the <span class="cmtt-10">tex4ht </span>program.
</li>
<li>A file named <span class="cmtt-10">tex4ht.fls </span>in the directory specified by an optional environment variable named <span class="cmtt-10">TEX4HTWR</span>.
</li>
<li>The location specified by an optional ‘<span class="cmtt-10">l</span>’ record provided in the environment file. </li>
<li>A file named <span class="cmtt-10">tex4ht.fls </span>in the work directory. </li></ol>
A given address may start with the character ‘<span class="cmtt-10">~</span>’ or the character pair ‘<span class="cmtt-10">~~</span>’. The single character ‘<span class="cmtt-10">~</span>’ is
interpreted to be the directory address of the root, provided in an environment variable named <span class="cmtt-10">HOME</span>. The
character pair ‘<span class="cmtt-10">~~</span>’ is interpreted to be a directory address provided in an environment variable named
<span class="cmtt-10">TEX4HTWR</span>. The address stored in the latter environment variable may also start with a single character
‘<span class="cmtt-10">~</span>’.
<!--l. 5989--><p class="indent"> The bookkeeping file must have writable access mode, and the directory which contains the file should have a
compatible access mode.
</p><!--l. 5993--><p class="indent"> The bookkeeping file is a dynamically constructed variant of the ls-R file of kpathsea. TeX4ht
ignores its own bookkeeping mechanism, if the program <span class="cmtt-10">tex4ht.c </span>is compiled with a raised <span class="cmtt-10">-DKPATHSEA</span>
switch.
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