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// Copyright (C) 2020-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// <charconv> is supported in C++14 as a GNU extension
// { dg-do run { target c++14 } }
#include <charconv>
#include <string>
#include <cmath>
#include <testsuite_hooks.h>
// Test std::from_chars error handling.
#if __cpp_lib_to_chars >= 201611L
void
test01()
{
std::from_chars_result r;
double d = 3.2;
std::string s;
for (auto p : { "", "*", ".", "-", "-*", "-.", "+", "+.", "+-", "-+", "+1",
".p1", "-.p1",
"in", "inch", "+inf", "na", "nam", "+nan" })
{
s = p;
for (auto fmt : { std::chars_format::fixed, std::chars_format::scientific,
std::chars_format::general, std::chars_format::hex })
{
r = std::from_chars(s.data(), s.data() + s.length(), d, fmt);
VERIFY( r.ec == std::errc::invalid_argument );
VERIFY( r.ptr == s.data() );
VERIFY( d == 3.2 );
}
}
for (auto p : { ".e1", "-.e1" }) // These are valid patterns for hex format
{
s = p;
for (auto fmt : { std::chars_format::fixed, std::chars_format::scientific,
std::chars_format::general })
{
r = std::from_chars(s.data(), s.data() + s.length(), d, fmt);
VERIFY( r.ec == std::errc::invalid_argument );
VERIFY( r.ptr == s.data() );
VERIFY( d == 3.2 );
}
}
// scientific format requires an exponent
for (auto p : { "1.2", "-1.2", "1.2e", "-1.2e", "1.2e-", "-1.2e+" })
{
s = p;
r = std::from_chars(s.data(), s.data() + s.length(), d,
std::chars_format::scientific);
VERIFY( r.ec == std::errc::invalid_argument );
VERIFY( r.ptr == s.data() );
VERIFY( d == 3.2 );
}
// patterns that are invalid without the final character
for (auto p : { "1", ".1", "-1", "-.1",
"inf", "-inf", "nan", "-nan" })
{
s = p;
for (auto fmt : { std::chars_format::fixed, std::chars_format::scientific,
std::chars_format::general, std::chars_format::hex })
{
r = std::from_chars(s.data(), s.data() + s.length() - 1, d, fmt);
VERIFY( r.ec == std::errc::invalid_argument );
VERIFY( r.ptr == s.data() );
VERIFY( d == 3.2 );
}
}
}
void
test02()
{
std::from_chars_result r;
std::string s;
float f = 0.5;
// Overflow
s = "99999999999999999e999999999999999999";
r = std::from_chars(s.data(), s.data() + s.length(), f);
VERIFY( r.ec == std::errc::result_out_of_range );
VERIFY( r.ptr == s.data() + s.length() );
VERIFY( f == 0.5 );
s += '*';
r = std::from_chars(s.data(), s.data() + s.length(), f);
VERIFY( r.ec == std::errc::result_out_of_range );
VERIFY( r.ptr == s.data() + s.length() - 1 );
VERIFY( f == 0.5 );
s.insert(s.begin(), '-');
r = std::from_chars(s.data(), s.data() + s.length(), f);
VERIFY( r.ec == std::errc::result_out_of_range );
VERIFY( r.ptr == s.data() + s.length() - 1 );
VERIFY( f == 0.5 );
}
void
test03()
{
double d = 0.5;
// Underflow
std::string s("-1.2345e-9999zzz");
std::from_chars_result res;
res = std::from_chars(s.data(), s.data() + s.length(), d);
VERIFY( res.ptr == s.data() + s.length() - 3 );
VERIFY( res.ec == std::errc::result_out_of_range );
VERIFY( d == 0.5 );
res = std::from_chars(s.data() + 1, s.data() + s.length(), d);
VERIFY( res.ptr == s.data() + s.length() - 3 );
VERIFY( res.ec == std::errc::result_out_of_range );
VERIFY( d == 0.5 );
}
void
test04()
{
std::from_chars_result res;
std::string z(2000, '0');
// Invalid inputs for scientific format
for (const char* s : { "", "1", ".", ".0", ".5", "1e+", "1e+-1" })
{
for (auto len : { 0, 10, 100, 1000, 2000 })
{
auto str = z.substr(len) + s;
double d = 99.0;
res = std::from_chars(str.data(), str.data() + str.length(), d,
std::chars_format::scientific);
VERIFY( res.ec == std::errc::invalid_argument );
VERIFY( res.ptr == str.data() );
VERIFY( d == 99.0 );
}
}
}
#endif
int
main()
{
#if __cpp_lib_to_chars >= 201611L
test01();
test02();
test03();
test04();
#endif
}
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