http://llvm.org/bugs/show_bug.cgi?id=16783
Bug ID: 16783
Summary: fstream::readsome can not read any data
Product: libc++
Version: unspecified
Hardware: Macintosh
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
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;
}
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