test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// REQUIRES: can-create-symlinks
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: no-filesystem
// UNSUPPORTED: availability-filesystem-missing

// The string reported on errors changed, which makes those tests fail when run
// against already-released libc++'s.
// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.15|11.0}}

// <filesystem>

// uintmax_t file_size(const path& p);
// uintmax_t file_size(const path& p, std::error_code& ec) noexcept;

#include <filesystem>
#include <type_traits>
#include <cassert>

#include "assert_macros.h"
#include "test_macros.h"
#include "filesystem_test_helper.h"
namespace fs = std::filesystem;
using namespace fs;

static void signature_test()
{
    const path p; ((void)p);
    std::error_code ec; ((void)ec);
    ASSERT_SAME_TYPE(decltype(file_size(p)), std::uintmax_t);
    ASSERT_SAME_TYPE(decltype(file_size(p, ec)), std::uintmax_t);
    ASSERT_NOT_NOEXCEPT(file_size(p));
    ASSERT_NOEXCEPT(file_size(p, ec));
}

static void file_size_empty_test()
{
    static_test_env static_env;
    const path p = static_env.EmptyFile;
    assert(file_size(p) == 0);
    std::error_code ec;
    assert(file_size(p, ec) == 0);
}

static void file_size_non_empty()
{
    scoped_test_env env;
    const path p = env.create_file("file", 42);
    assert(file_size(p) == 42);
    std::error_code ec;
    assert(file_size(p, ec) == 42);
}

static void symlink_test_case()
{
    static_test_env static_env;
    const path p = static_env.File;
    const path p2 = static_env.SymlinkToFile;
    assert(file_size(p) == file_size(p2));
}

static void file_size_error_cases()
{
  static_test_env static_env;
  struct {
    path p;
    std::errc expected_err;
  } TestCases[] = {
      {static_env.Dir, std::errc::is_a_directory},
      {static_env.SymlinkToDir, std::errc::is_a_directory},
      {static_env.BadSymlink, std::errc::no_such_file_or_directory},
      {static_env.DNE, std::errc::no_such_file_or_directory},
      {"", std::errc::no_such_file_or_directory}};
    const std::uintmax_t expect = static_cast<std::uintmax_t>(-1);
    for (auto& TC : TestCases) {
      std::error_code ec = GetTestEC();
      assert(file_size(TC.p, ec) == expect);
      assert(ErrorIs(ec, TC.expected_err));

      ExceptionChecker Checker(TC.p, TC.expected_err, "file_size");
      TEST_VALIDATE_EXCEPTION(filesystem_error, Checker, file_size(TC.p));
    }
}

int main(int, char**) {
    signature_test();
    file_size_empty_test();
    file_size_non_empty();
    symlink_test_case();
    file_size_error_cases();
    return 0;
}