329 lines
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329 lines
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<ul><li><a href="../inweb/index.html">inweb</a></li>
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</ul><h2>Foundation Module</h2><ul>
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<!--Weave of 'Pathnames' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="index.html">foundation</a></li><li><a href="index.html#3">Chapter 3: The Operating System</a></li><li><b>Pathnames</b></li></ul><p class="purpose">Locations of hypothetical or real directories in the filing system.</p>
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<ul class="toc"><li><a href="3-pth.html#SP1">§1. About pathnames</a></li><li><a href="3-pth.html#SP2">§2. Home directory</a></li><li><a href="3-pth.html#SP3">§3. Installation directory</a></li><li><a href="3-pth.html#SP4">§4. Creation</a></li><li><a href="3-pth.html#SP5">§5. Text to pathnames</a></li><li><a href="3-pth.html#SP6">§6. Writer</a></li><li><a href="3-pth.html#SP7">§7. Relative pathnames</a></li><li><a href="3-pth.html#SP8">§8. Relative URLs</a></li><li><a href="3-pth.html#SP9">§9. Existence in the file system</a></li><li><a href="3-pth.html#SP10">§10. Directory synchronisation</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. About pathnames. </b>We use the word "pathname" to mean a file-system location of a directory,
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and "filename" to mean a location of a file. For example:
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="plain-syntax"> /Users/rblackmore/Documents/Fireball</span>
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</pre>
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<p class="inwebparagraph">is a pathname, whereas
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="plain-syntax"> /Users/rblackmore/Documents/Fireball/whoosh.aiff</span>
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</pre>
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<p class="inwebparagraph">is a filename. All references to directory locations in the filing system will be
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held internally as <span class="extract"><span class="extract-syntax">pathname</span></span> objects, and all references to file locations as
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<span class="extract"><span class="extract-syntax">filename</span></span> objects. Once created, these are never destroyed or modified,
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so that it's safe to store a pointer to a pathname or filename anywhere.
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</p>
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<p class="inwebparagraph">Note that a pathname may well be hypothetical, that is, it may well
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describe a directory which doesn't exist on disc.
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</p>
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<p class="inwebparagraph">A full path is a linked list, but reverse-ordered: thus,
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="plain-syntax"> /Users/rblackmore/Documents/</span>
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</pre>
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<p class="inwebparagraph">would be represented as a pointer to the <span class="extract"><span class="extract-syntax">pathname</span></span> for "Documents", which
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in turn points to one for "rblackmore", which in turn points to "/Users".
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Thus the root of the filing system is represented by the null pointer.
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</p>
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<p class="inwebparagraph">Each <span class="extract"><span class="extract-syntax">pathname</span></span> can represent only a single level in the hierarchy, and
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its textual name is not allowed to contain the <span class="extract"><span class="extract-syntax">FOLDER_SEPARATOR</span></span> character,
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with just one exception: the <span class="extract"><span class="extract-syntax">pathname</span></span> at the end of the chain is allowed
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to begin with <span class="extract"><span class="extract-syntax">FOLDER_SEPARATOR</span></span> to denote that it's at the root of the
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host file system.
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">intermediate</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pathname_of_parent</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">known_to_exist</span><span class="plain-syntax">; </span><span class="comment"> corresponds to a directory in the filing system</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">MEMORY_MANAGEMENT</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">pathname</span><span class="plain-syntax">;</span>
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</pre><ul class="endnotetexts"><li>The structure pathname is accessed in 3/fln and here.</li></ul><p class="inwebparagraph"><a id="SP2"></a><b>§2. Home directory. </b>We get the path to the user's home directory from the environment variable
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<span class="extract"><span class="extract-syntax">HOME</span></span>, if it exists.
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">home_path</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::start</span><button class="popup" onclick="togglePopup('usagePopup1')">...<span class="popuptext" id="usagePopup1">Usage of <b>Pathnames::start</b>:<br>Foundation Module - <a href="1-fm.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">home</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *) (</span><a href="1-wp.html#SP4" class="function-link"><span class="function-syntax">Platform::getenv</span></a><span class="plain-syntax">(</span><span class="string-syntax">"HOME"</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">home</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">H</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP4" class="function-link"><span class="function-syntax">Str::new_from_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">home</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">home_path</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP5" class="function-link"><span class="function-syntax">Pathnames::from_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">H</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">home_path</span><span class="plain-syntax">-></span><span class="element-syntax">known_to_exist</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre><p class="inwebparagraph"><a id="SP3"></a><b>§3. Installation directory. </b></p>
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<pre class="displayed-code all-displayed-code">
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<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">installation_path</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::set_installation_path</span><button class="popup" onclick="togglePopup('usagePopup2')">...<span class="popuptext" id="usagePopup2">Usage of <b>Pathnames::set_installation_path</b>:<br>Command Line Arguments - <a href="3-cla.html#SP13_1">§13.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">installation_path</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::installation_path</span><button class="popup" onclick="togglePopup('usagePopup3')">...<span class="popuptext" id="usagePopup3">Usage of <b>Pathnames::installation_path</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">def</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">installation_path</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">installation_path</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">where</span><span class="plain-syntax">[4*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">where</span><span class="plain-syntax">[0] = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="1-wp.html#SP5" class="function-link"><span class="function-syntax">Platform::where_am_i</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">where</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">where</span><span class="plain-syntax">[0]) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP4" class="function-link"><span class="function-syntax">Str::new_from_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">where</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="3-fln.html#SP3" class="function-link"><span class="function-syntax">Filenames::from_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">v</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="3-fln.html#SP6" class="function-link"><span class="function-syntax">Filenames::up</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">P</span><span class="plain-syntax">) && (</span><a href="4-sm.html#SP19" class="function-link"><span class="function-syntax">Str::eq</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">intermediate</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Tangled"</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">pathname_of_parent</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><a href="1-wp.html#SP4" class="function-link"><span class="function-syntax">Platform::getenv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">val</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">val</span><span class="plain-syntax">[0])) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP4" class="function-link"><span class="function-syntax">Str::new_from_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-pth.html#SP5" class="function-link"><span class="function-syntax">Pathnames::from_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">v</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">def</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-pth.html#SP5" class="function-link"><span class="function-syntax">Pathnames::from_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">def</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre><p class="inwebparagraph"><a id="SP4"></a><b>§4. Creation. </b>A subdirectory is made by taking an existing pathname (or possible <span class="extract"><span class="extract-syntax">NULL</span></span>) and
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then going one level deeper, using the supplied name.
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</p>
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<pre class="displayed-code all-displayed-code">
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<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::down</span><button class="popup" onclick="togglePopup('usagePopup4')">...<span class="popuptext" id="usagePopup4">Usage of <b>Pathnames::down</b>:<br>Epub Ebooks - <a href="5-ee.html#SP6">§6</a>, <a href="5-ee.html#SP6_2">§6.2</a><br>Web Structure - <a href="8-ws.html#SP7_3_3_2">§7.3.3.2</a>, <a href="8-ws.html#SP7_2_2_4">§7.2.2.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">dir_name</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-pth.html#SP4" class="function-link"><span class="function-syntax">Pathnames::primitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">dir_name</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">dir_name</span><span class="plain-syntax">), </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::primitive</span><button class="popup" onclick="togglePopup('usagePopup5')">...<span class="popuptext" id="usagePopup5">Usage of <b>Pathnames::primitive</b>:<br><a href="3-pth.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">str</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">par</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">pathname_of_parent</span><span class="plain-syntax"> = </span><span class="identifier-syntax">par</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">known_to_exist</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">to</span><span class="plain-syntax">-</span><span class="identifier-syntax">from</span><span class="plain-syntax"> <= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"empty intermediate pathname"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">intermediate</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP2" class="function-link"><span class="function-syntax">Str::new_with_capacity</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">to</span><span class="plain-syntax">-</span><span class="identifier-syntax">from</span><span class="plain-syntax">+1);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">str</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="identifier-syntax">to</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">intermediate</span><span class="plain-syntax">, </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">str</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">)));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre><p class="inwebparagraph"><a id="SP5"></a><b>§5. Text to pathnames. </b>The following takes a text of a name and returns a pathname,
|
|
possibly relative to the home directory. Empty directory names are ignored
|
|
except possibly for an initial slash, so for example <span class="extract"><span class="extract-syntax">paris/roubaix</span></span>,
|
|
<span class="extract"><span class="extract-syntax">paris//roubaix</span></span> and <span class="extract"><span class="extract-syntax">paris/roubaix/</span></span> are indistinguishable here, but
|
|
<span class="extract"><span class="extract-syntax">/paris/roubaix</span></span> is different.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::from_text</span><button class="popup" onclick="togglePopup('usagePopup6')">...<span class="popuptext" id="usagePopup6">Usage of <b>Pathnames::from_text</b>:<br><a href="3-pth.html#SP2">§2</a>, <a href="3-pth.html#SP3">§3</a>, Command Line Arguments - <a href="3-cla.html#SP13_1">§13.1</a>, <a href="3-cla.html#SP13_1_1">§13.1.1</a><br>Filenames - <a href="3-fln.html#SP3">§3</a><br>Epub Ebooks - <a href="5-ee.html#SP7_4">§7.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">path</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-pth.html#SP5" class="function-link"><span class="function-syntax">Pathnames::from_text_relative</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">path</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::from_text_relative</span><button class="popup" onclick="togglePopup('usagePopup7')">...<span class="popuptext" id="usagePopup7">Usage of <b>Pathnames::from_text_relative</b>:<br>Web Modules - <a href="8-wm.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">path</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">pos</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">path</span><span class="plain-syntax">))) && (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="identifier-syntax">i</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (; </span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">path</span><span class="plain-syntax">); </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">path</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">)) == </span><span class="constant-syntax">FOLDER_SEPARATOR</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> > </span><span class="identifier-syntax">pos</span><span class="plain-syntax">) </span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP4" class="function-link"><span class="function-syntax">Pathnames::primitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">path</span><span class="plain-syntax">, </span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">i</span><span class="plain-syntax">+1;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> > </span><span class="identifier-syntax">pos</span><span class="plain-syntax">) </span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP4" class="function-link"><span class="function-syntax">Pathnames::primitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">path</span><span class="plain-syntax">, </span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">at</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre><p class="inwebparagraph"><a id="SP6"></a><b>§6. Writer. </b>Conversely, by the miracle of depth-first recursion:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::writer</span><button class="popup" onclick="togglePopup('usagePopup8')">...<span class="popuptext" id="usagePopup8">Usage of <b>Pathnames::writer</b>:<br>Foundation Module - <a href="1-fm.html#SP8_1">§8.1</a><br>Filenames - <a href="3-fln.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">format_string</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vP</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">vP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">divider</span><span class="plain-syntax"> = </span><span class="constant-syntax">FOLDER_SEPARATOR</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">format_string</span><span class="plain-syntax">[0] == </span><span class="character-syntax">'/'</span><span class="plain-syntax">) </span><span class="identifier-syntax">divider</span><span class="plain-syntax"> = </span><span class="character-syntax">'/'</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">) </span><a href="3-pth.html#SP6" class="function-link"><span class="function-syntax">Pathnames::writer_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">divider</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::writer_r</span><button class="popup" onclick="togglePopup('usagePopup9')">...<span class="popuptext" id="usagePopup9">Usage of <b>Pathnames::writer_r</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">divider</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">pathname_of_parent</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="3-pth.html#SP6" class="function-link"><span class="function-syntax">Pathnames::writer_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">pathname_of_parent</span><span class="plain-syntax">, </span><span class="identifier-syntax">divider</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><span class="identifier-syntax">divider</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">intermediate</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre><p class="inwebparagraph"><a id="SP7"></a><b>§7. Relative pathnames. </b>Occasionally we want to shorten a pathname relative to another one:
|
|
for example,
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="plain-syntax"> /Users/rblackmore/Documents/Fireball/tablature</span>
|
|
</pre>
|
|
<p class="inwebparagraph">relative to
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="plain-syntax"> /Users/rblackmore/Documents/</span>
|
|
</pre>
|
|
<p class="inwebparagraph">would be
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="plain-syntax"> Fireball/tablature</span>
|
|
</pre>
|
|
<p class="inwebparagraph">Note that this does not correctly handle symlinks, <span class="extract"><span class="extract-syntax">.</span></span>, <span class="extract"><span class="extract-syntax">..</span></span> and so on,
|
|
so it's probably not wise to use it with filenames typed in at the command
|
|
line.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::to_text_relative</span><button class="popup" onclick="togglePopup('usagePopup10')">...<span class="popuptext" id="usagePopup10">Usage of <b>Pathnames::to_text_relative</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="4-sm.html#SP21" class="function-link"><span class="function-syntax">Str::prefix_eq</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</span><span class="plain-syntax">)) && (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</span><span class="plain-syntax">)==</span><span class="constant-syntax">FOLDER_SEPARATOR</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP25" class="function-link"><span class="function-syntax">Str::delete_n_characters</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</span><span class="plain-syntax">+1);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">rt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"pathname not relative to pathname"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">rt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::up</span><button class="popup" onclick="togglePopup('usagePopup11')">...<span class="popuptext" id="usagePopup11">Usage of <b>Pathnames::up</b>:<br><a href="3-pth.html#SP8">§8</a>, Web Modules - <a href="8-wm.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't go up from root directory"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">pathname_of_parent</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Pathnames::directory_name</span><button class="popup" onclick="togglePopup('usagePopup12')">...<span class="popuptext" id="usagePopup12">Usage of <b>Pathnames::directory_name</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">intermediate</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre><p class="inwebparagraph"><a id="SP8"></a><b>§8. Relative URLs. </b>Suppose a web page in the directory at <span class="extract"><span class="extract-syntax">from</span></span> wants to link to a page in
|
|
the directory <span class="extract"><span class="extract-syntax">to</span></span>. The following composes a minimal-length URL to do so:
|
|
possibly, if they are in fact the same directory, an empty one.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::relative_URL</span><button class="popup" onclick="togglePopup('usagePopup13')">...<span class="popuptext" id="usagePopup13">Usage of <b>Pathnames::relative_URL</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">to</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax"> && (</span><span class="identifier-syntax">found</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP7" class="function-link"><span class="function-syntax">Pathnames::up</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">PT</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">PT</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">q_up_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">; </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> && (</span><span class="identifier-syntax">found</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">); </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP7" class="function-link"><span class="function-syntax">Pathnames::up</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">QT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">QT</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Q</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP19" class="function-link"><span class="function-syntax">Str::eq</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">PT</span><span class="plain-syntax">, </span><span class="identifier-syntax">QT</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">q_up_count</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="string-syntax">"../"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">FPT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">FPT</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">to</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP26" class="function-link"><span class="function-syntax">Str::substr</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FPT</span><span class="plain-syntax">, </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">PT</span><span class="plain-syntax">) + </span><span class="constant-syntax">1</span><span class="plain-syntax">), </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FPT</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">QT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">q_up_count</span><span class="plain-syntax">++;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">PT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">found</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">; </span><span class="identifier-syntax">Q</span><span class="plain-syntax">; </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><a href="3-pth.html#SP7" class="function-link"><span class="function-syntax">Pathnames::up</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">)) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="string-syntax">"../"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">to</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">url</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">) && (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_last_char</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">) != </span><span class="character-syntax">'/'</span><span class="plain-syntax">)) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"/"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre><p class="inwebparagraph"><a id="SP9"></a><b>§9. Existence in the file system. </b>Just because we have a pathname, it doesn't follow that any directory exists
|
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on the file system with that path.
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</p>
|
|
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<pre class="displayed-code all-displayed-code">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::create_in_file_system</span><button class="popup" onclick="togglePopup('usagePopup14')">...<span class="popuptext" id="usagePopup14">Usage of <b>Pathnames::create_in_file_system</b>:<br>Epub Ebooks - <a href="5-ee.html#SP6">§6</a>, <a href="5-ee.html#SP6_2">§6.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">; </span><span class="comment"> the root of the file system always exists</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">known_to_exist</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">transcoded_pathname</span><span class="plain-syntax">[4*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP6" class="function-link"><span class="function-syntax">Str::copy_to_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">transcoded_pathname</span><span class="plain-syntax">, </span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">);</span>
|
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">known_to_exist</span><span class="plain-syntax"> = </span><a href="1-wp.html#SP7" class="function-link"><span class="function-syntax">Platform::mkdir</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">transcoded_pathname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">known_to_exist</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
|
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</pre><p class="inwebparagraph"><a id="SP10"></a><b>§10. Directory synchronisation. </b>Both pathnames here represent directories which do exist. The function makes
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|
the <span class="extract"><span class="extract-syntax">dest</span></span> tree an exact copy of the <span class="extract"><span class="extract-syntax">source</span></span> tree (and therefore deletes
|
|
anything different which was originally in <span class="extract"><span class="extract-syntax">dest</span></span>).
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Pathnames::rsync</span><button class="popup" onclick="togglePopup('usagePopup15')">...<span class="popuptext" id="usagePopup15">Usage of <b>Pathnames::rsync</b>:<br>none</span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">source</span><span class="plain-syntax">, </span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">dest</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">transcoded_source</span><span class="plain-syntax">[4*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">source</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP6" class="function-link"><span class="function-syntax">Str::copy_to_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">transcoded_source</span><span class="plain-syntax">, </span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">transcoded_dest</span><span class="plain-syntax">[4*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn2</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">dest</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP6" class="function-link"><span class="function-syntax">Str::copy_to_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">transcoded_dest</span><span class="plain-syntax">, </span><span class="identifier-syntax">pn2</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn2</span><span class="plain-syntax">);</span>
|
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<span class="plain-syntax"> </span><a href="1-pp.html#SP14" class="function-link"><span class="function-syntax">Platform::rsync</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">transcoded_source</span><span class="plain-syntax">, </span><span class="identifier-syntax">transcoded_dest</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
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</pre><hr class="tocbar">
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<ul class="toc"><li><a href="3-cla.html">Back to 'Command Line Arguments'</a></li><li><a href="3-fln.html">Continue with 'Filenames'</a></li></ul><hr class="tocbar">
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