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<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>
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<th>Summary</th>
<td>Clang issues incorrect warning when leading [^] scanset is used in scanf()
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.4
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>llvmbugs@happyjack.org
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<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>
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