650 lines
37 KiB
HTML
650 lines
37 KiB
HTML
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<title>tree walking API</title>
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>tree walking API</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The tree walking API is used to traverse and inspect trees.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_data_structures">Data Structures</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>struct name_entry</code></dt>
|
|
<dd>
|
|
<p>An entry in a tree. Each entry has a sha1 identifier, pathname, and
|
|
mode.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>struct tree_desc</code></dt>
|
|
<dd>
|
|
<p>A semi-opaque data structure used to maintain the current state of the
|
|
walk.</p>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>buffer</code> is a pointer into the memory representation of the tree. It always
|
|
points at the current entry being visited.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>size</code> counts the number of bytes left in the <code>buffer</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>entry</code> points to the current entry being visited.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</dd>
|
|
<dt class="hdlist1"><code>struct traverse_info</code></dt>
|
|
<dd>
|
|
<p>A structure used to maintain the state of a traversal.</p>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>prev</code> points to the traverse_info which was used to descend into the
|
|
current tree. If this is the top-level tree <code>prev</code> will point to
|
|
a dummy traverse_info.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>name</code> is the entry for the current tree (if the tree is a subtree).</p>
|
|
</li>
|
|
<li>
|
|
<p><code>pathlen</code> is the length of the full path for the current tree.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>conflicts</code> can be used by callbacks to maintain directory-file conflicts.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>fn</code> is a callback called for each entry in the tree. See Traversing for more
|
|
information.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>data</code> can be anything the <code>fn</code> callback would want to use.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>show_all_errors</code> tells whether to stop at the first error or not.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_initializing">Initializing</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>init_tree_desc</code></dt>
|
|
<dd>
|
|
<p>Initialize a <code>tree_desc</code> and decode its first entry. The buffer and
|
|
size parameters are assumed to be the same as the buffer and size
|
|
members of <code>struct tree</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>fill_tree_descriptor</code></dt>
|
|
<dd>
|
|
<p>Initialize a <code>tree_desc</code> and decode its first entry given the
|
|
object ID of a tree. Returns the <code>buffer</code> member if the latter
|
|
is a valid tree identifier and NULL otherwise.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>setup_traverse_info</code></dt>
|
|
<dd>
|
|
<p>Initialize a <code>traverse_info</code> given the pathname of the tree to start
|
|
traversing from. The <code>base</code> argument is assumed to be the <code>path</code>
|
|
member of the <code>name_entry</code> being recursed into unless the tree is a
|
|
top-level tree in which case the empty string ("") is used.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_walking">Walking</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>tree_entry</code></dt>
|
|
<dd>
|
|
<p>Visit the next entry in a tree. Returns 1 when there are more entries
|
|
left to visit and 0 when all entries have been visited. This is
|
|
commonly used in the test of a while loop.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>tree_entry_len</code></dt>
|
|
<dd>
|
|
<p>Calculate the length of a tree entry’s pathname. This utilizes the
|
|
memory structure of a tree entry to avoid the overhead of using a
|
|
generic strlen().</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>update_tree_entry</code></dt>
|
|
<dd>
|
|
<p>Walk to the next entry in a tree. This is commonly used in conjunction
|
|
with <code>tree_entry_extract</code> to inspect the current entry.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>tree_entry_extract</code></dt>
|
|
<dd>
|
|
<p>Decode the entry currently being visited (the one pointed to by
|
|
<code>tree_desc's</code> <code>entry</code> member) and return the sha1 of the entry. The
|
|
<code>pathp</code> and <code>modep</code> arguments are set to the entry’s pathname and mode
|
|
respectively.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>get_tree_entry</code></dt>
|
|
<dd>
|
|
<p>Find an entry in a tree given a pathname and the sha1 of a tree to
|
|
search. Returns 0 if the entry is found and -1 otherwise. The third
|
|
and fourth parameters are set to the entry’s sha1 and mode
|
|
respectively.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_traversing">Traversing</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>traverse_trees</code></dt>
|
|
<dd>
|
|
<p>Traverse <code>n</code> number of trees in parallel. The <code>fn</code> callback member of
|
|
<code>traverse_info</code> is called once for each tree entry.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>traverse_callback_t</code></dt>
|
|
<dd>
|
|
<p>The arguments passed to the traverse callback are as follows:</p>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>n</code> counts the number of trees being traversed.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>mask</code> has its nth bit set if something exists in the nth entry.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>dirmask</code> has its nth bit set if the nth tree’s entry is a directory.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>entry</code> is an array of size <code>n</code> where the nth entry is from the nth tree.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>info</code> maintains the state of the traversal.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Returning a negative value will terminate the traversal. Otherwise the
|
|
return value is treated as an update mask. If the nth bit is set the nth tree
|
|
will be updated and if the bit is not set the nth tree entry will be the
|
|
same in the next callback invocation.</p>
|
|
</div>
|
|
</dd>
|
|
<dt class="hdlist1"><code>make_traverse_path</code></dt>
|
|
<dd>
|
|
<p>Generate the full pathname of a tree entry based from the root of the
|
|
traversal. For example, if the traversal has recursed into another
|
|
tree named "bar" the pathname of an entry "baz" in the "bar"
|
|
tree would be "bar/baz".</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>traverse_path_len</code></dt>
|
|
<dd>
|
|
<p>Calculate the length of a pathname returned by <code>make_traverse_path</code>.
|
|
This utilizes the memory structure of a tree entry to avoid the
|
|
overhead of using a generic strlen().</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_authors">Authors</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Written by Junio C Hamano <<a href="mailto:gitster@pobox.com">gitster@pobox.com</a>> and Linus Torvalds
|
|
<<a href="mailto:torvalds@linux-foundation.org">torvalds@linux-foundation.org</a>></p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2019-02-26 19:31:11 UTC
|
|
</div>
|
|
</div>
|
|
</body>
|
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</html> |