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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 --- - fstream::readsome can not read any data"
href="http://llvm.org/bugs/show_bug.cgi?id=16783">16783</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>fstream::readsome can not read any data
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</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>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>hhinnant@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>xtaotao@qq.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>I download the libcxx 3.3 source with llvm 3.3 release version source. and
compiler it with libunwind, libcxxrt.
// clang++ a.cpp -std=c++11 -stdlib=libc++
// ubuntu 13.04
// clang version 3.3
#include <fstream>
#include <iostream>
int main(int argc, char* argv[])
{
std::ifstream fs(argv[0], std::ios::in);
char szBuffer[1024];
auto readSize = fs.readsome(szBuffer, 1024);
std::cout << "read size: " << readSize << ", rdstate: " << fs.rdstate() <<
", good: " << fs.good() << ", eof: " << fs.eof() << "." << std::endl;
// output: read size: 0, rdstate: 0, good: 1, eof: 0.
auto beginPos = fs.tellg();
fs.read(szBuffer, 1024);
auto newPos = fs.tellg();
std::cout << "read size: " << newPos - beginPos << ", rdstate: " <<
fs.rdstate() << ", good: " << fs.good() << ", eof: " << fs.eof() << "." <<
std::endl;
// output: read size: 1024, rdstate: 0, good: 1, eof: 0.
return 0;
}</pre>
</div>
</p>
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