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[libcxx] Fix a bug in strstreambuf::overflow.

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The end pointer should point to one past the end of the newly allocated
buffer.

rdar://problem/24265174

Differential Revision: http://reviews.llvm.org/D20334

llvm-svn: 274132
This commit is contained in:
Akira Hatanaka 2016-06-29 15:26:13 +00:00
parent 832d042078
commit 2556b769ec
2 changed files with 33 additions and 2 deletions
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3
libcxx/src/strstream.cpp
View File

@ -175,7 +175,6 @@ strstreambuf::overflow(int_type __c)
ptrdiff_t ninp = gptr() - eback();
ptrdiff_t einp = egptr() - eback();
ptrdiff_t nout = pptr() - pbase();
ptrdiff_t eout = epptr() - pbase();
if (__strmode_ & __allocated)
{
if (__pfree_)
@ -184,7 +183,7 @@ strstreambuf::overflow(int_type __c)
delete [] eback();
}
setg(buf, buf + ninp, buf + einp);
setp(buf + einp, buf + einp + eout);
setp(buf + einp, buf + new_size);
pbump(static_cast<int>(nout));
__strmode_ |= __allocated;
}

32
libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp Normal file
View File

@ -0,0 +1,32 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <strstream>
// class strstreambuf
// int overflow(int c);
#include <iostream>
#include <string>
#include <strstream>
int main(int, char const **argv) {
std::ostrstream oss;
std::string s;
for (int i = 0; i < 4096; ++i)
s.push_back((i % 16) + 'a');
oss << s << std::ends;
std::cout << oss.str();
oss.freeze(false);
return 0;
}