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// REQUIRES: can-create-symlinks
10// UNSUPPORTED: c++03, c++11, c++14
11// UNSUPPORTED: no-filesystem
12// UNSUPPORTED: availability-filesystem-missing
13
14// <filesystem>
15
16// void resize_file(const path& p, uintmax_t new_size);
17// void resize_file(const path& p, uintmax_t new_size, error_code& ec) noexcept;
18
19#include <filesystem>
20
21#include "test_macros.h"
22#include "filesystem_test_helper.h"
23namespace fs = std::filesystem;
24using namespace fs;
25
26static void test_signatures()
27{
28 const path p; ((void)p);
29 std::uintmax_t i; ((void)i);
30 std::error_code ec; ((void)ec);
31
32 ASSERT_SAME_TYPE(decltype(fs::resize_file(p, i)), void);
33 ASSERT_SAME_TYPE(decltype(fs::resize_file(p, i, ec)), void);
34
35 ASSERT_NOT_NOEXCEPT(fs::resize_file(p: p, size: i));
36 ASSERT_NOEXCEPT(fs::resize_file(p: p, size: i, ec&: ec));
37}
38
39static void test_error_reporting()
40{
41 auto checkThrow = [](path const& f, std::uintmax_t s, const std::error_code& ec)
42 {
43#ifndef TEST_HAS_NO_EXCEPTIONS
44 try {
45 fs::resize_file(p: f, size: s);
46 return false;
47 } catch (filesystem_error const& err) {
48 return err.path1() == f
49 && err.path2() == ""
50 && err.code() == ec;
51 }
52#else
53 ((void)f); ((void)s); ((void)ec);
54 return true;
55#endif
56 };
57 scoped_test_env env;
58 const path dne = env.make_env_path("dne");
59 const path bad_sym = env.create_symlink(dne, "sym");
60 const path dir = env.create_dir("dir1");
61 const path cases[] = {
62 dne, bad_sym, dir
63 };
64 for (auto& p : cases) {
65 std::error_code ec;
66 resize_file(p, 42, ec);
67 assert(ec);
68 assert(checkThrow(p, 42, ec));
69 }
70}
71
72static void basic_resize_file_test()
73{
74 scoped_test_env env;
75 const path file1 = env.create_file("file1", 42);
76 const auto set_ec = std::make_error_code(e: std::errc::address_in_use);
77 { // grow file
78 const std::uintmax_t new_s = 100;
79 std::error_code ec = set_ec;
80 resize_file(p: file1, size: new_s, ec&: ec);
81 assert(!ec);
82 assert(file_size(p: file1) == new_s);
83 }
84 { // shrink file
85 const std::uintmax_t new_s = 1;
86 std::error_code ec = set_ec;
87 resize_file(p: file1, size: new_s, ec&: ec);
88 assert(!ec);
89 assert(file_size(p: file1) == new_s);
90 }
91 { // shrink file to zero
92 const std::uintmax_t new_s = 0;
93 std::error_code ec = set_ec;
94 resize_file(p: file1, size: new_s, ec&: ec);
95 assert(!ec);
96 assert(file_size(p: file1) == new_s);
97 }
98 const path sym = env.create_symlink(file1, "sym");
99 { // grow file via symlink
100 const std::uintmax_t new_s = 1024;
101 std::error_code ec = set_ec;
102 resize_file(p: sym, size: new_s, ec&: ec);
103 assert(!ec);
104 assert(file_size(p: file1) == new_s);
105 }
106}
107
108int main(int, char**) {
109 test_signatures();
110 test_error_reporting();
111 basic_resize_file_test();
112 return 0;
113}
114

source code of libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp