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// Formatting library for C++ - std::ostream support
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#ifndef FMT_OSTREAM_H_
#define FMT_OSTREAM_H_
#ifndef FMT_MODULE
# include <fstream> // std::filebuf
#endif
#ifdef _WIN32
# ifdef __GLIBCXX__
# include <ext/stdio_filebuf.h>
# include <ext/stdio_sync_filebuf.h>
# endif
# include <io.h>
#endif
#include "chrono.h" // formatbuf
#ifdef _MSVC_STL_UPDATE
# define FMT_MSVC_STL_UPDATE _MSVC_STL_UPDATE
#elif defined(_MSC_VER) && _MSC_VER < 1912 // VS 15.5
# define FMT_MSVC_STL_UPDATE _MSVC_LANG
#else
# define FMT_MSVC_STL_UPDATE 0
#endif
FMT_BEGIN_NAMESPACE
namespace detail {
// Generate a unique explicit instantion in every translation unit using a tag
// type in an anonymous namespace.
namespace {
struct file_access_tag {};
} // namespace
template <typename Tag, typename BufType, FILE* BufType::*FileMemberPtr>
class file_access {
friend auto get_file(BufType& obj) -> FILE* { return obj.*FileMemberPtr; }
};
#if FMT_MSVC_STL_UPDATE
template class file_access<file_access_tag, std::filebuf,
&std::filebuf::_Myfile>;
auto get_file(std::filebuf&) -> FILE*;
#endif
// Write the content of buf to os.
// It is a separate function rather than a part of vprint to simplify testing.
template <typename Char>
void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
const Char* buf_data = buf.data();
using unsigned_streamsize = make_unsigned_t<std::streamsize>;
unsigned_streamsize size = buf.size();
unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());
do {
unsigned_streamsize n = size <= max_size ? size : max_size;
os.write(buf_data, static_cast<std::streamsize>(n));
buf_data += n;
size -= n;
} while (size != 0);
}
template <typename T> struct streamed_view {
const T& value;
};
} // namespace detail
// Formats an object of type T that has an overloaded ostream operator<<.
template <typename Char>
struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
void set_debug_format() = delete;
template <typename T, typename Context>
auto format(const T& value, Context& ctx) const -> decltype(ctx.out()) {
auto buffer = basic_memory_buffer<Char>();
auto&& formatbuf = detail::formatbuf<std::basic_streambuf<Char>>(buffer);
auto&& output = std::basic_ostream<Char>(&formatbuf);
output.imbue(std::locale::classic()); // The default is always unlocalized.
output << value;
output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
return formatter<basic_string_view<Char>, Char>::format(
{buffer.data(), buffer.size()}, ctx);
}
};
using ostream_formatter = basic_ostream_formatter<char>;
template <typename T, typename Char>
struct formatter<detail::streamed_view<T>, Char>
: basic_ostream_formatter<Char> {
template <typename Context>
auto format(detail::streamed_view<T> view, Context& ctx) const
-> decltype(ctx.out()) {
return basic_ostream_formatter<Char>::format(view.value, ctx);
}
};
/**
* Returns a view that formats `value` via an ostream `operator<<`.
*
* **Example**:
*
* fmt::print("Current thread id: {}\n",
* fmt::streamed(std::this_thread::get_id()));
*/
template <typename T>
constexpr auto streamed(const T& value) -> detail::streamed_view<T> {
return {value};
}
inline void vprint(std::ostream& os, string_view fmt, format_args args) {
auto buffer = memory_buffer();
detail::vformat_to(buffer, fmt, args);
FILE* f = nullptr;
#if FMT_MSVC_STL_UPDATE && FMT_USE_RTTI
if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
f = detail::get_file(*buf);
#elif defined(_WIN32) && defined(__GLIBCXX__) && FMT_USE_RTTI
auto* rdbuf = os.rdbuf();
if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
f = sfbuf->file();
else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
f = fbuf->file();
#endif
#ifdef _WIN32
if (f) {
int fd = _fileno(f);
if (_isatty(fd)) {
os.flush();
if (detail::write_console(fd, {buffer.data(), buffer.size()})) return;
}
}
#endif
detail::ignore_unused(f);
detail::write_buffer(os, buffer);
}
/**
* Prints formatted data to the stream `os`.
*
* **Example**:
*
* fmt::print(cerr, "Don't {}!", "panic");
*/
FMT_EXPORT template <typename... T>
void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
fmt::vargs<T...> vargs = {{args...}};
if (detail::use_utf8) return vprint(os, fmt.str, vargs);
auto buffer = memory_buffer();
detail::vformat_to(buffer, fmt.str, vargs);
detail::write_buffer(os, buffer);
}
FMT_EXPORT template <typename... T>
void println(std::ostream& os, format_string<T...> fmt, T&&... args) {
fmt::print(os, "{}\n", fmt::format(fmt, std::forward<T>(args)...));
}
FMT_END_NAMESPACE
#endif // FMT_OSTREAM_H_
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