1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <streambuf>
10
11 // UNSUPPORTED: c++03
12
13 // template <class charT, class traits = char_traits<charT> >
14 // class basic_streambuf;
15
16 // void pbump(int n);
17 //
18 // REQUIRES: long_tests
19
20 // Unsupported for no-exceptions builds because they have no way to report an
21 // allocation failure when attempting to allocate the 2GiB string.
22 // UNSUPPORTED: no-exceptions
23
24 // Android devices frequently don't have enough memory to run this test. Rather
25 // than throw std::bad_alloc, exhausting memory triggers the OOM Killer.
26 // UNSUPPORTED: LIBCXX-ANDROID-FIXME
27
28 #include <sstream>
29 #include <cassert>
30 #include "test_macros.h"
31
32 struct SB : std::stringbuf
33 {
SBSB34 SB() : std::stringbuf(std::ios::ate|std::ios::out) { }
pubpbaseSB35 const char* pubpbase() const { return pbase(); }
pubpptrSB36 const char* pubpptr() const { return pptr(); }
37 };
38
main(int,char **)39 int main(int, char**)
40 {
41 try {
42 std::string str(2147483648, 'a');
43 SB sb;
44 sb.str(str);
45 assert(sb.pubpbase() <= sb.pubpptr());
46 }
47 catch (const std::length_error &) {} // maybe the string can't take 2GB
48 catch (const std::bad_alloc &) {} // maybe we don't have enough RAM
49
50 return 0;
51 }
52