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// template <class charT, class traits = char_traits<charT> >
12// class basic_streambuf;
13
14// streamsize xsgetn(char_type* s, streamsize n);
15
16#include <streambuf>
17#include <cassert>
18#include <cstring>
19
20#include "test_macros.h"
21
22struct test
23 : public std::basic_streambuf<char>
24{
25 typedef std::basic_streambuf<char> base;
26
27 test() {}
28
29 void setg(char* gbeg, char* gnext, char* gend)
30 {
31 base::setg(gbeg: gbeg, gnext: gnext, gend: gend);
32 }
33};
34
35int main(int, char**)
36{
37 test t;
38 char input[7] = "123456";
39 t.setg(gbeg: input, gnext: input, gend: input+7);
40 char output[sizeof(input)] = {0};
41 assert(t.sgetn(output, 10) == 7);
42 assert(std::strcmp(input, output) == 0);
43
44 return 0;
45}
46

source code of libcxx/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/xsgetn.pass.cpp