148 lines
3.5 KiB
C++
148 lines
3.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/StringBuilder.h"
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#include "td/utils/misc.h"
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#include "td/utils/port/thread_local.h"
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#include <cstdio>
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#include <limits>
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#include <locale>
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#include <sstream>
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#include <utility>
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namespace td {
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template <class T>
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static char *print_uint(char *current_ptr, T x) {
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if (x < 100) {
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if (x < 10) {
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*current_ptr++ = static_cast<char>('0' + x);
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} else {
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*current_ptr++ = static_cast<char>('0' + x / 10);
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*current_ptr++ = static_cast<char>('0' + x % 10);
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}
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return current_ptr;
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}
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auto begin_ptr = current_ptr;
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do {
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*current_ptr++ = static_cast<char>('0' + x % 10);
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x /= 10;
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} while (x > 0);
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auto end_ptr = current_ptr - 1;
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while (begin_ptr < end_ptr) {
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std::swap(*begin_ptr++, *end_ptr--);
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}
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return current_ptr;
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}
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template <class T>
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static char *print_int(char *current_ptr, T x) {
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if (x < 0) {
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if (x == std::numeric_limits<T>::min()) {
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std::stringstream ss;
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ss << x;
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auto len = narrow_cast<int>(static_cast<std::streamoff>(ss.tellp()));
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ss.read(current_ptr, len);
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return current_ptr + len;
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}
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*current_ptr++ = '-';
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x = -x;
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}
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return print_uint(current_ptr, x);
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}
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StringBuilder &StringBuilder::operator<<(int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_int(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(unsigned int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_uint(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(long int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_int(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(long unsigned int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_uint(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(long long int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_int(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(long long unsigned int x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ = print_uint(current_ptr_, x);
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(FixedDouble x) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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static TD_THREAD_LOCAL std::stringstream *ss;
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if (init_thread_local<std::stringstream>(ss)) {
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auto previous_locale = ss->imbue(std::locale::classic());
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ss->setf(std::ios_base::fixed, std::ios_base::floatfield);
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} else {
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ss->str(std::string());
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ss->clear();
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}
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ss->precision(x.precision);
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*ss << x.d;
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int len = narrow_cast<int>(static_cast<std::streamoff>(ss->tellp()));
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auto left = end_ptr_ + reserved_size - current_ptr_;
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if (unlikely(len >= left)) {
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error_flag_ = true;
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len = left ? narrow_cast<int>(left - 1) : 0;
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}
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ss->read(current_ptr_, len);
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current_ptr_ += len;
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return *this;
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}
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StringBuilder &StringBuilder::operator<<(const void *ptr) {
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if (unlikely(end_ptr_ < current_ptr_)) {
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return on_error();
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}
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current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%p", ptr);
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return *this;
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}
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} // namespace td
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