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    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - basic_istream::read(s, n) should use sgetn(s, n) rather than calling sbumpc() for each character."
   href="http://llvm.org/bugs/show_bug.cgi?id=15427">15427</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>basic_istream::read(s, n) should use sgetn(s, n) rather than calling sbumpc() for each character.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>hhinnant@apple.com
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tuhertz@gmail.com
          </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>basic_istream::read(s, n) should call basic_streambuf's sgetn(s, n) as
basic_ostream::write(s, n) calling sputn(s, n).

in basic_istream::read(char_type* __s, streamsize __n)

-         for (; __gc_ < __n; ++__gc_)
-            {
-               typename traits_type::int_type __i = this->rdbuf()->sbumpc();
-                if (traits_type::eq_int_type(__i, traits_type::eof()))
-                {
-                   this->setstate(ios_base::failbit | ios_base::eofbit);
-                   break;
-                }
-                *__s++ = traits_type::to_char_type(__i);
-            }

+          __gc_ = this->rdbuf()->sgetn(__s, __n);
+          if (__gc_ != __n)
+            this->setstate(ios_base::failbit | ios_base::eofbit);</pre>
        </div>
      </p>
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