106 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <fstream>10 11// template <class charT, class traits = char_traits<charT> >12// class basic_filebuf13 14// template <class charT, class traits>15// void16// swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);17 18#include <fstream>19#include <cassert>20#include "test_macros.h"21#include "platform_support.h"22 23int main(int, char**)24{25 std::string temp = get_temp_file_name();26 {27 std::filebuf f;28 assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in29 | std::ios_base::trunc) != 0);30 assert(f.is_open());31 assert(f.sputn("123", 3) == 3);32 f.pubseekoff(1, std::ios_base::beg);33 assert(f.sgetc() == '2');34 std::filebuf f2;35 swap(f2, f);36 assert(!f.is_open());37 assert(f2.is_open());38 assert(f2.sgetc() == '2');39 }40 std::remove(temp.c_str());41 42 // lhs uses a small buffer, rhs is empty43 {44 std::filebuf f;45 assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in46 | std::ios_base::trunc) != 0);47 assert(f.is_open());48 assert(f.sputn("123", 3) == 3);49 f.pubseekoff(1, std::ios_base::beg);50 assert(f.sgetc() == '2');51 std::filebuf f2;52 swap(f, f2);53 assert(!f.is_open());54 assert(f2.is_open());55 assert(f2.sgetc() == '2');56 }57 std::remove(temp.c_str());58 59 // neither lhs nor rhs use the small buffer60 {61 std::string tmpA = get_temp_file_name();62 std::string tmpB = get_temp_file_name();63 64 {65 // currently the small buffer has size 866 std::ofstream sa(tmpA), sb(tmpB);67 sa << "0123456789";68 sb << "abcdefghij";69 }70 71 std::filebuf f1, f2;72 assert(f1.open(tmpA, std::ios_base::in) != 0);73 assert(f2.open(tmpB, std::ios_base::in) != 0);74 assert(f1.sgetc() == '0');75 assert(f2.sgetc() == 'a');76 77 swap(f1, f2);78 79 assert(f1.sgetc() == 'a');80 assert(f2.sgetc() == '0');81 82 std::remove(tmpA.c_str());83 std::remove(tmpB.c_str());84 }85 86#ifndef TEST_HAS_NO_WIDE_CHARACTERS87 {88 std::wfilebuf f;89 assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in90 | std::ios_base::trunc) != 0);91 assert(f.is_open());92 assert(f.sputn(L"123", 3) == 3);93 f.pubseekoff(1, std::ios_base::beg);94 assert(f.sgetc() == L'2');95 std::wfilebuf f2;96 swap(f2, f);97 assert(!f.is_open());98 assert(f2.is_open());99 assert(f2.sgetc() == L'2');100 }101 std::remove(temp.c_str());102#endif103 104 return 0;105}106