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<body class="article">
<div id="header">
<h1>allocation growing API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Dynamically growing an array using realloc() is error prone and boring.</p></div>
<div class="paragraph"><p>Define your array with:</p></div>
<div class="ulist"><ul>
<li>
<p>
a pointer (<code>item</code>) that points at the array, initialized to <code>NULL</code>
  (although please name the variable based on its contents, not on its
  type);
</p>
</li>
<li>
<p>
an integer variable (<code>alloc</code>) that keeps track of how big the current
  allocation is, initialized to <code>0</code>;
</p>
</li>
<li>
<p>
another integer variable (<code>nr</code>) to keep track of how many elements the
  array currently has, initialized to <code>0</code>.
</p>
</li>
</ul></div>
<div class="paragraph"><p>Then before adding <code>n`th element to the item, call `ALLOC_GROW(item, n,
alloc)</code>.  This ensures that the array can hold at least <code>n</code> elements by
calling <code>realloc(3)</code> and adjusting <code>alloc</code> variable.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>sometype *item;
size_t nr;
size_t alloc

for (i = 0; i &lt; nr; i++)
        if (we like item[i] already)
                return;

/* we did not like any existing one, so add one */
ALLOC_GROW(item, nr + 1, alloc);
item[nr++] = value you like;</code></pre>
</div></div>
<div class="paragraph"><p>You are responsible for updating the <code>nr</code> variable.</p></div>
</div>
</div>
</div>
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Last updated 2013-06-10 20:01:55 UTC
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