142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
|
|
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
|
|
#pragma once
|
|
|
|
#include <chrono>
|
|
#include <iterator>
|
|
#include <spdlog/common.h>
|
|
#include <spdlog/fmt/fmt.h>
|
|
#include <type_traits>
|
|
|
|
#ifdef SPDLOG_USE_STD_FORMAT
|
|
#include <charconv>
|
|
#include <limits>
|
|
#endif
|
|
|
|
// Some fmt helpers to efficiently format and pad ints and strings
|
|
namespace spdlog {
|
|
namespace details {
|
|
namespace fmt_helper {
|
|
|
|
inline void append_string_view(spdlog::string_view_t view, memory_buf_t &dest) {
|
|
auto *buf_ptr = view.data();
|
|
dest.append(buf_ptr, buf_ptr + view.size());
|
|
}
|
|
|
|
#ifdef SPDLOG_USE_STD_FORMAT
|
|
template <typename T>
|
|
inline void append_int(T n, memory_buf_t &dest) {
|
|
// Buffer should be large enough to hold all digits (digits10 + 1) and a sign
|
|
SPDLOG_CONSTEXPR const auto BUF_SIZE = std::numeric_limits<T>::digits10 + 2;
|
|
char buf[BUF_SIZE];
|
|
|
|
auto [ptr, ec] = std::to_chars(buf, buf + BUF_SIZE, n, 10);
|
|
if (ec == std::errc()) {
|
|
dest.append(buf, ptr);
|
|
} else {
|
|
throw_spdlog_ex("Failed to format int", static_cast<int>(ec));
|
|
}
|
|
}
|
|
#else
|
|
template <typename T>
|
|
inline void append_int(T n, memory_buf_t &dest) {
|
|
fmt::format_int i(n);
|
|
dest.append(i.data(), i.data() + i.size());
|
|
}
|
|
#endif
|
|
|
|
template <typename T>
|
|
SPDLOG_CONSTEXPR_FUNC unsigned int count_digits_fallback(T n) {
|
|
// taken from fmt: https://github.com/fmtlib/fmt/blob/8.0.1/include/fmt/format.h#L899-L912
|
|
unsigned int count = 1;
|
|
for (;;) {
|
|
// Integer division is slow so do it for a group of four digits instead
|
|
// of for every digit. The idea comes from the talk by Alexandrescu
|
|
// "Three Optimization Tips for C++". See speed-test for a comparison.
|
|
if (n < 10) return count;
|
|
if (n < 100) return count + 1;
|
|
if (n < 1000) return count + 2;
|
|
if (n < 10000) return count + 3;
|
|
n /= 10000u;
|
|
count += 4;
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline unsigned int count_digits(T n) {
|
|
using count_type =
|
|
typename std::conditional<(sizeof(T) > sizeof(uint32_t)), uint64_t, uint32_t>::type;
|
|
#ifdef SPDLOG_USE_STD_FORMAT
|
|
return count_digits_fallback(static_cast<count_type>(n));
|
|
#else
|
|
return static_cast<unsigned int>(fmt::
|
|
// fmt 7.0.0 renamed the internal namespace to detail.
|
|
// See: https://github.com/fmtlib/fmt/issues/1538
|
|
#if FMT_VERSION < 70000
|
|
internal
|
|
#else
|
|
detail
|
|
#endif
|
|
::count_digits(static_cast<count_type>(n)));
|
|
#endif
|
|
}
|
|
|
|
inline void pad2(int n, memory_buf_t &dest) {
|
|
if (n >= 0 && n < 100) // 0-99
|
|
{
|
|
dest.push_back(static_cast<char>('0' + n / 10));
|
|
dest.push_back(static_cast<char>('0' + n % 10));
|
|
} else // unlikely, but just in case, let fmt deal with it
|
|
{
|
|
fmt_lib::format_to(std::back_inserter(dest), SPDLOG_FMT_STRING("{:02}"), n);
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline void pad_uint(T n, unsigned int width, memory_buf_t &dest) {
|
|
static_assert(std::is_unsigned<T>::value, "pad_uint must get unsigned T");
|
|
for (auto digits = count_digits(n); digits < width; digits++) {
|
|
dest.push_back('0');
|
|
}
|
|
append_int(n, dest);
|
|
}
|
|
|
|
template <typename T>
|
|
inline void pad3(T n, memory_buf_t &dest) {
|
|
static_assert(std::is_unsigned<T>::value, "pad3 must get unsigned T");
|
|
if (n < 1000) {
|
|
dest.push_back(static_cast<char>(n / 100 + '0'));
|
|
n = n % 100;
|
|
dest.push_back(static_cast<char>((n / 10) + '0'));
|
|
dest.push_back(static_cast<char>((n % 10) + '0'));
|
|
} else {
|
|
append_int(n, dest);
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline void pad6(T n, memory_buf_t &dest) {
|
|
pad_uint(n, 6, dest);
|
|
}
|
|
|
|
template <typename T>
|
|
inline void pad9(T n, memory_buf_t &dest) {
|
|
pad_uint(n, 9, dest);
|
|
}
|
|
|
|
// return fraction of a second of the given time_point.
|
|
// e.g.
|
|
// fraction<std::milliseconds>(tp) -> will return the millis part of the second
|
|
template <typename ToDuration>
|
|
inline ToDuration time_fraction(log_clock::time_point tp) {
|
|
using std::chrono::duration_cast;
|
|
using std::chrono::seconds;
|
|
auto duration = tp.time_since_epoch();
|
|
auto secs = duration_cast<seconds>(duration);
|
|
return duration_cast<ToDuration>(duration) - duration_cast<ToDuration>(secs);
|
|
}
|
|
|
|
} // namespace fmt_helper
|
|
} // namespace details
|
|
} // namespace spdlog
|