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🚧 overworked fix for #465

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Niels Lohmann
2017-02-21 19:11:34 +01:00
parent 7d14f167b8
commit 967f9144d4
3 changed files with 43 additions and 33 deletions
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33
src/json.hpp
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@ -8252,9 +8252,8 @@ class basic_json
}
private:
static constexpr size_t s_capacity = 30;
/// added capacity for leading '-' and trailing '\0'
std::array < char, s_capacity + 2 > m_buf{{}};
/// a (hopefully) large enough character buffer
std::array < char, 64 > m_buf{{}};
template<typename NumberType>
void x_write(NumberType x, /*is_integral=*/std::true_type)
@ -8266,23 +8265,24 @@ class basic_json
return;
}
static_assert(std::numeric_limits<NumberType>::digits10 <= s_capacity,
"unexpected NumberType");
const bool is_neg = x < 0;
const bool is_negative = x < 0;
size_t i = 0;
while (x != 0 and i < s_capacity)
// spare 1 byte for '\0'
while (x != 0 and i < m_buf.size() - 1)
{
const auto digit = std::labs(static_cast<long>(x % 10));
m_buf[i++] = static_cast<char>('0' + digit);
x /= 10;
}
assert(i < s_capacity);
// make sure the number has been processed completely
assert(x == 0);
if (is_neg)
if (is_negative)
{
// make sure there is capacity for the '-'
assert(i < m_buf.size() - 2);
m_buf[i++] = '-';
}
@ -8306,11 +8306,16 @@ class basic_json
return;
}
// get number of digits for a text -> float -> text round-trip
static constexpr auto d = std::numeric_limits<NumberType>::digits10;
static_assert(d == 6 or d == 15 or d == 16 or d == 17,
"unexpected NumberType");
snprintf(m_buf.data(), m_buf.size(), "%.*g", d, x);
// the actual conversion
const auto written_bytes = snprintf(m_buf.data(), m_buf.size(), "%.*g", d, x);
// negative value indicates an error
assert(written_bytes > 0);
// check if buffer was large enough
assert(written_bytes < m_buf.size());
// read information from locale
const auto loc = localeconv();
@ -8324,7 +8329,7 @@ class basic_json
// erase thousands separator
if (thousands_sep != '\0')
{
const auto end = std::remove(m_buf.begin(), m_buf.end(), thousands_sep);
const auto end = std::remove(m_buf.begin(), m_buf.begin() + written_bytes, thousands_sep);
std::fill(end, m_buf.end(), '\0');
}