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// Copyright (C) 2020-2024 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/>.
// { dg-do run { target c++14 } }
#include <charconv>
#include <string>
#include <testsuite_hooks.h>
#ifdef DEBUG
#include <stdio.h>
#endif
long long
read(const char* first, const char* last, int base)
{
long long val = 0;
unsigned long long place = 1;
while (last > first)
{
val += (*--last - '0') * place;
place *= base;
}
return val;
}
void
test01()
{
std::from_chars_result res;
long long val;
for (auto s : { "10001", "10010", "10011", "10101", "10110", "10111",
"11001", "11010", "11011", "11101", "11110", "11111" })
{
std::string ss[2] = { s, std::string(64, '0') + s };
for (const auto& str : ss)
{
const char* first = str.data();
for (int base = 2; base < 37; ++base)
{
const char* last = str.data() + str.length();
for (size_t n = 0; n < ss[0].length(); ++n)
{
#ifdef DEBUG
printf("Parsing \"%.*s\" in base %d\n", int(last - first), first,
base);
#endif
res = std::from_chars(first, last, val, base);
VERIFY( res.ptr == last );
VERIFY( res.ec == std::errc{} );
VERIFY( val == read(first, last, base) );
// Test again with shorter string to check from_chars doesn't read
// the digits past the last pointer.
--last;
}
}
}
}
}
int
main()
{
test01();
}
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