6xxx strlen and 9xxx conclusions.

[libguestfs-talks.git] / 2020-frama-c / 6100-strlen-1.html

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+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>glibc strlen (part 1)</h1>
+
+<pre class="code">
+size_t
+test_strlen (const char *str)
+{
+  const char *char_ptr;
+
+  <span class="comment">/* Handle the first few characters by reading one character at a time.
+     Do this until CHAR_PTR is aligned on a longword boundary.  */</span>
+  for (char_ptr = str; ((unsigned long int) char_ptr
+                       & (sizeof (longword) - 1)) != 0;
+       ++char_ptr)
+    if (*char_ptr == '\0')
+      return char_ptr - str;
+</pre>