//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include <__assert>
#include <cerrno>
#include <charconv>
#include <cstdlib>
#include <limits>
#include <stdexcept>
#include <string>
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
# include <cwchar>
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON
template <bool>
struct __basic_string_common;
// The struct isn't declared anymore in the headers. It's only here for ABI compatibility.
template <>
struct __basic_string_common<true> {
[[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_length_error() const;
[[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_out_of_range() const;
};
void __basic_string_common<true>::__throw_length_error() const { std::__throw_length_error("basic_string"); }
void __basic_string_common<true>::__throw_out_of_range() const { std::__throw_out_of_range("basic_string"); }
#endif // _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON
#define _LIBCPP_EXTERN_TEMPLATE_DEFINE(...) template __VA_ARGS__;
#ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
# endif
#else
_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
# endif
#endif
#undef _LIBCPP_EXTERN_TEMPLATE_DEFINE
template string operator+ <char, char_traits<char>, allocator<char>>(char const*, string const&);
namespace {
inline void throw_from_string_out_of_range(const string& func) {
std::__throw_out_of_range((func + ": out of range").c_str());
}
inline void throw_from_string_invalid_arg(const string& func) {
std::__throw_invalid_argument((func + ": no conversion").c_str());
}
// as_integer
template <typename V, typename S, typename F>
inline V as_integer_helper(const string& func, const S& str, size_t* idx, int base, F f) {
typename S::value_type* ptr = nullptr;
const typename S::value_type* const p = str.c_str();
__libcpp_remove_reference_t<decltype(errno)> errno_save = errno;
errno = 0;
V r = f(p, &ptr, base);
swap(errno, errno_save);
if (errno_save == ERANGE)
throw_from_string_out_of_range(func);
if (ptr == p)
throw_from_string_invalid_arg(func);
if (idx)
*idx = static_cast<size_t>(ptr - p);
return r;
}
template <typename V, typename S>
inline V as_integer(const string& func, const S& s, size_t* idx, int base);
// string
template <>
inline int as_integer(const string& func, const string& s, size_t* idx, int base) {
// Use long as no Standard string to integer exists.
long r = as_integer_helper<long>(func, s, idx, base, strtol);
if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
throw_from_string_out_of_range(func);
return static_cast<int>(r);
}
template <>
inline long as_integer(const string& func, const string& s, size_t* idx, int base) {
return as_integer_helper<long>(func, s, idx, base, strtol);
}
template <>
inline unsigned long as_integer(const string& func, const string& s, size_t* idx, int base) {
return as_integer_helper<unsigned long>(func, s, idx, base, strtoul);
}
template <>
inline long long as_integer(const string& func, const string& s, size_t* idx, int base) {
return as_integer_helper<long long>(func, s, idx, base, strtoll);
}
template <>
inline unsigned long long as_integer(const string& func, const string& s, size_t* idx, int base) {
return as_integer_helper<unsigned long long>(func, s, idx, base, strtoull);
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
// wstring
template <>
inline int as_integer(const string& func, const wstring& s, size_t* idx, int base) {
// Use long as no Stantard string to integer exists.
long r = as_integer_helper<long>(func, s, idx, base, wcstol);
if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
throw_from_string_out_of_range(func);
return static_cast<int>(r);
}
template <>
inline long as_integer(const string& func, const wstring& s, size_t* idx, int base) {
return as_integer_helper<long>(func, s, idx, base, wcstol);
}
template <>
inline unsigned long as_integer(const string& func, const wstring& s, size_t* idx, int base) {
return as_integer_helper<unsigned long>(func, s, idx, base, wcstoul);
}
template <>
inline long long as_integer(const string& func, const wstring& s, size_t* idx, int base) {
return as_integer_helper<long long>(func, s, idx, base, wcstoll);
}
template <>
inline unsigned long long as_integer(const string& func, const wstring& s, size_t* idx, int base) {
return as_integer_helper<unsigned long long>(func, s, idx, base, wcstoull);
}
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
// as_float
template <typename V, typename S, typename F>
inline V as_float_helper(const string& func, const S& str, size_t* idx, F f) {
typename S::value_type* ptr = nullptr;
const typename S::value_type* const p = str.c_str();
__libcpp_remove_reference_t<decltype(errno)> errno_save = errno;
errno = 0;
V r = f(p, &ptr);
swap(errno, errno_save);
if (errno_save == ERANGE)
throw_from_string_out_of_range(func);
if (ptr == p)
throw_from_string_invalid_arg(func);
if (idx)
*idx = static_cast<size_t>(ptr - p);
return r;
}
template <typename V, typename S>
inline V as_float(const string& func, const S& s, size_t* idx = nullptr);
template <>
inline float as_float(const string& func, const string& s, size_t* idx) {
return as_float_helper<float>(func, s, idx, strtof);
}
template <>
inline double as_float(const string& func, const string& s, size_t* idx) {
return as_float_helper<double>(func, s, idx, strtod);
}
template <>
inline long double as_float(const string& func, const string& s, size_t* idx) {
return as_float_helper<long double>(func, s, idx, strtold);
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <>
inline float as_float(const string& func, const wstring& s, size_t* idx) {
return as_float_helper<float>(func, s, idx, wcstof);
}
template <>
inline double as_float(const string& func, const wstring& s, size_t* idx) {
return as_float_helper<double>(func, s, idx, wcstod);
}
template <>
inline long double as_float(const string& func, const wstring& s, size_t* idx) {
return as_float_helper<long double>(func, s, idx, wcstold);
}
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
} // unnamed namespace
int stoi(const string& str, size_t* idx, int base) { return as_integer<int>("stoi", str, idx, base); }
long stol(const string& str, size_t* idx, int base) { return as_integer<long>("stol", str, idx, base); }
unsigned long stoul(const string& str, size_t* idx, int base) {
return as_integer<unsigned long>("stoul", str, idx, base);
}
long long stoll(const string& str, size_t* idx, int base) { return as_integer<long long>("stoll", str, idx, base); }
unsigned long long stoull(const string& str, size_t* idx, int base) {
return as_integer<unsigned long long>("stoull", str, idx, base);
}
float stof(const string& str, size_t* idx) { return as_float<float>("stof", str, idx); }
double stod(const string& str, size_t* idx) { return as_float<double>("stod", str, idx); }
long double stold(const string& str, size_t* idx) { return as_float<long double>("stold", str, idx); }
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
int stoi(const wstring& str, size_t* idx, int base) { return as_integer<int>("stoi", str, idx, base); }
long stol(const wstring& str, size_t* idx, int base) { return as_integer<long>("stol", str, idx, base); }
unsigned long stoul(const wstring& str, size_t* idx, int base) {
return as_integer<unsigned long>("stoul", str, idx, base);
}
long long stoll(const wstring& str, size_t* idx, int base) { return as_integer<long long>("stoll", str, idx, base); }
unsigned long long stoull(const wstring& str, size_t* idx, int base) {
return as_integer<unsigned long long>("stoull", str, idx, base);
}
float stof(const wstring& str, size_t* idx) { return as_float<float>("stof", str, idx); }
double stod(const wstring& str, size_t* idx) { return as_float<double>("stod", str, idx); }
long double stold(const wstring& str, size_t* idx) { return as_float<long double>("stold", str, idx); }
#endif // !_LIBCPP_HAS_NO_WIDE_CHARACTERS
// to_string
namespace {
// as_string
template <typename S, typename P, typename V >
inline S as_string(P sprintf_like, S s, const typename S::value_type* fmt, V a) {
typedef typename S::size_type size_type;
size_type available = s.size();
while (true) {
int status = sprintf_like(&s[0], available + 1, fmt, a);
if (status >= 0) {
size_type used = static_cast<size_type>(status);
if (used <= available) {
s.resize(used);
break;
}
available = used; // Assume this is advice of how much space we need.
} else
available = available * 2 + 1;
s.resize(available);
}
return s;
}
template <class S>
struct initial_string;
template <>
struct initial_string<string> {
string operator()() const {
string s;
s.resize(s.capacity());
return s;
}
};
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <>
struct initial_string<wstring> {
wstring operator()() const {
wstring s(20, wchar_t());
s.resize(s.capacity());
return s;
}
};
typedef int (*wide_printf)(wchar_t* __restrict, size_t, const wchar_t* __restrict, ...);
inline wide_printf get_swprintf() {
# ifndef _LIBCPP_MSVCRT
return swprintf;
# else
return static_cast<int(__cdecl*)(wchar_t* __restrict, size_t, const wchar_t* __restrict, ...)>(_snwprintf);
# endif
}
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <typename S, typename V>
S i_to_string(V v) {
// numeric_limits::digits10 returns value less on 1 than desired for unsigned numbers.
// For example, for 1-byte unsigned value digits10 is 2 (999 can not be represented),
// so we need +1 here.
constexpr size_t bufsize = numeric_limits<V>::digits10 + 2; // +1 for minus, +1 for digits10
char buf[bufsize];
const auto res = to_chars(buf, buf + bufsize, v);
_LIBCPP_ASSERT_INTERNAL(res.ec == errc(), "bufsize must be large enough to accomodate the value");
return S(buf, res.ptr);
}
} // unnamed namespace
string to_string(int val) { return i_to_string< string>(val); }
string to_string(long val) { return i_to_string< string>(val); }
string to_string(long long val) { return i_to_string< string>(val); }
string to_string(unsigned val) { return i_to_string< string>(val); }
string to_string(unsigned long val) { return i_to_string< string>(val); }
string to_string(unsigned long long val) { return i_to_string< string>(val); }
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
wstring to_wstring(int val) { return i_to_string<wstring>(val); }
wstring to_wstring(long val) { return i_to_string<wstring>(val); }
wstring to_wstring(long long val) { return i_to_string<wstring>(val); }
wstring to_wstring(unsigned val) { return i_to_string<wstring>(val); }
wstring to_wstring(unsigned long val) { return i_to_string<wstring>(val); }
wstring to_wstring(unsigned long long val) { return i_to_string<wstring>(val); }
#endif
string to_string(float val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
string to_string(double val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
string to_string(long double val) { return as_string(snprintf, initial_string< string>()(), "%Lf", val); }
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
wstring to_wstring(float val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
wstring to_wstring(double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
wstring to_wstring(long double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%Lf", val); }
#endif
_LIBCPP_END_NAMESPACE_STD
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