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      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Clang issues incorrect warning when leading [^] scanset is used in scanf()"
   href="http://llvm.org/bugs/show_bug.cgi?id=19559">19559</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clang issues incorrect warning when leading [^] scanset is used in scanf()
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.4
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>llvmbugs@happyjack.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In a C program, the following code:

char foo[1024];
scanf("%[^]% ]", foo);

Causes the following warning:

warning: invalid conversion specifier ' ' [-Wformat-invalid-specifier]

This does not happen with the format string "%[]% ]", indicating that Clang
does not recognize that a closing bracket after the caret does not close the
scanset.

Relevant C99 section is 7.19.6.2p12: “If the conversion specifier begins with
[] or [^], the right bracket character is in the scanlist and the next
following right bracket character is the matching right bracket that ends the
specification; otherwise the first following right bracket character is the one
that ends the specification."</pre>
        </div>
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