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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/moneystr.h>
#include <amount.h>
#include <tinyformat.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <optional>
std::string FormatMoney(const CAmount n)
{
// Note: not using straight sprintf here because we do NOT want
// localized number formatting.
static_assert(COIN > 1);
int64_t quotient = n / COIN;
int64_t remainder = n % COIN;
if (n < 0) {
quotient = -quotient;
remainder = -remainder;
}
std::string str = strprintf("%d.%08d", quotient, remainder);
// Right-trim excess zeros before the decimal point:
int nTrim = 0;
for (int i = str.size()-1; (str[i] == '0' && IsDigit(str[i-2])); --i)
++nTrim;
if (nTrim)
str.erase(str.size()-nTrim, nTrim);
if (n < 0)
str.insert((unsigned int)0, 1, '-');
return str;
}
std::optional<CAmount> ParseMoney(const std::string& money_string)
{
if (!ValidAsCString(money_string)) {
return std::nullopt;
}
const std::string str = TrimString(money_string);
if (str.empty()) {
return std::nullopt;
}
std::string strWhole;
int64_t nUnits = 0;
const char* p = str.c_str();
for (; *p; p++)
{
if (*p == '.')
{
p++;
int64_t nMult = COIN / 10;
while (IsDigit(*p) && (nMult > 0))
{
nUnits += nMult * (*p++ - '0');
nMult /= 10;
}
break;
}
if (IsSpace(*p))
return std::nullopt;
if (!IsDigit(*p))
return std::nullopt;
strWhole.insert(strWhole.end(), *p);
}
if (*p) {
return std::nullopt;
}
if (strWhole.size() > 10) // guard against 63 bit overflow
return std::nullopt;
if (nUnits < 0 || nUnits > COIN)
return std::nullopt;
int64_t nWhole = atoi64(strWhole);
CAmount value = nWhole * COIN + nUnits;
if (!MoneyRange(value)) {
return std::nullopt;
}
return value;
}
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