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//===----------------------------------------------------------------------===//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// UNSUPPORTED: no-filesystem
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
// XFAIL: availability-fp_to_chars-missing
// The error exception has no system error string.
// XFAIL: LIBCXX-ANDROID-FIXME
// <print>
// template<class... Args>
// void println(FILE* stream, format_string<Args...> fmt, Args&&... args);
// In the library when the stdout is redirected to a file it is no
// longer considered a terminal and the special terminal handling is no
// longer executed. There are tests in
// libcxx/test/libcxx/input.output/iostream.format/print.fun/
// to validate that behaviour
#include <algorithm>
#include <array>
#include <cassert>
#include <cstddef>
#include <cstdio>
#include <fstream>
#include <fstream>
#include <iterator>
#include <print>
#include <string_view>
#include "assert_macros.h"
#include "concat_macros.h"
#include "filesystem_test_helper.h"
#include "print_tests.h"
#include "test_format_string.h"
#include "test_macros.h"
scoped_test_env env;
std::string filename = env.create_file("output.txt");
auto test_file = []<class... Args>(std::string_view e, test_format_string<char, Args...> fmt, Args&&... args) {
std::string expected = std::string{e} + '\n';
FILE* file = fopen(filename.c_str(), "wb");
assert(file);
std::println(file, fmt, std::forward<Args>(args)...);
std::fclose(file);
std::ifstream stream{filename.c_str(), std::ios_base::in | std::ios_base::binary};
std::string out(std::istreambuf_iterator<char>{stream}, {});
TEST_REQUIRE(out == expected,
TEST_WRITE_CONCATENATED(
"\nFormat string ", fmt.get(), "\nExpected output ", expected, "\nActual output ", out, '\n'));
};
auto test_exception = []<class... Args>(std::string_view, std::string_view, Args&&...) {
// After P2216 most exceptions thrown by std::format become ill-formed.
// Therefore this tests does nothing.
// A basic ill-formed test is done in format.verify.cpp
// The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
};
// Glibc fails writing to a wide stream.
#if defined(TEST_HAS_GLIBC) && !defined(TEST_HAS_NO_WIDE_CHARACTERS)
static void test_wide_stream() {
FILE* file = fopen(filename.c_str(), "wb");
assert(file);
int mode = std::fwide(file, 1);
assert(mode > 0);
TEST_VALIDATE_EXCEPTION(
std::system_error,
[&]([[maybe_unused]] const std::system_error& e) {
[[maybe_unused]] std::string_view what{"failed to write formatted output"};
TEST_LIBCPP_REQUIRE(
e.what() == what,
TEST_WRITE_CONCATENATED("\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
},
std::println(file, "hello"));
}
#endif // defined(TEST_HAS_GLIBC) && !defined(TEST_HAS_NO_WIDE_CHARACTERS)
static void test_read_only() {
FILE* file = fopen(filename.c_str(), "r");
assert(file);
TEST_VALIDATE_EXCEPTION(
std::system_error,
[&]([[maybe_unused]] const std::system_error& e) {
[[maybe_unused]] std::string_view what{
"failed to write formatted output: " TEST_IF_AIX("Broken pipe", "Operation not permitted")};
TEST_LIBCPP_REQUIRE(
e.what() == what,
TEST_WRITE_CONCATENATED("\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
},
std::println(file, "hello"));
}
static void test_new_line() {
// Text does newline translation.
{
FILE* file = fopen(filename.c_str(), "w");
assert(file);
std::println(file, "");
#ifndef _WIN32
assert(std::ftell(file) == 1);
#else
assert(std::ftell(file) == 2);
#endif
}
// Binary no newline translation.
{
FILE* file = fopen(filename.c_str(), "wb");
assert(file);
std::println(file, "");
assert(std::ftell(file) == 1);
}
}
static void test_println_blank_line() {
// Text does newline translation.
{
FILE* file = fopen(filename.c_str(), "w");
assert(file);
std::println(file);
#ifndef _WIN32
assert(std::ftell(file) == 1);
#else
assert(std::ftell(file) == 2);
#endif
}
// Binary no newline translation.
{
FILE* file = fopen(filename.c_str(), "wb");
assert(file);
std::println(file);
assert(std::ftell(file) == 1);
}
}
int main(int, char**) {
print_tests(test_file, test_exception);
#if defined(TEST_HAS_GLIBC) && !defined(TEST_HAS_NO_WIDE_CHARACTERS)
test_wide_stream();
#endif
test_read_only();
test_new_line();
test_println_blank_line();
return 0;
}
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