1// Copyright (c) 2009-2010 Satoshi Nakamoto
2// Copyright (c) 2009-present The Bitcoin Core developers
3// Distributed under the MIT software license, see the accompanying
4// file COPYING or http://www.opensource.org/licenses/mit-license.php.
5
6#include <util/moneystr.h>
7
8#include <consensus/amount.h>
9#include <tinyformat.h>
10#include <util/strencodings.h>
11#include <util/string.h>
12
13#include <cstdint>
14#include <optional>
15
16using util::ContainsNUL;
17using util::TrimString;
18
19std::string FormatMoney(const CAmount n)
20{
21    // Note: not using straight sprintf here because we do NOT want
22    // localized number formatting.
23    static_assert(COIN > 1);
24    int64_t quotient = n / COIN;
25    int64_t remainder = n % COIN;
26    if (n < 0) {
27        quotient = -quotient;
28        remainder = -remainder;
29    }
30    std::string str = strprintf("%d.%08d", quotient, remainder);
31
32    // Right-trim excess zeros before the decimal point:
33    int nTrim = 0;
34    for (int i = str.size()-1; (str[i] == '0' && IsDigit(str[i-2])); --i)
35        ++nTrim;
36    if (nTrim)
37        str.erase(str.size()-nTrim, nTrim);
38
39    if (n < 0)
40        str.insert(uint32_t{0}, 1, '-');
41    return str;
42}
43
44
45std::optional<CAmount> ParseMoney(const std::string& money_string)
46{
47    if (ContainsNUL(money_string)) {
48        return std::nullopt;
49    }
50    const std::string str = TrimString(money_string);
51    if (str.empty()) {
52        return std::nullopt;
53    }
54
55    std::string strWhole;
56    int64_t nUnits = 0;
57    const char* p = str.c_str();
58    for (; *p; p++)
59    {
60        if (*p == '.')
61        {
62            p++;
63            int64_t nMult = COIN / 10;
64            while (IsDigit(*p) && (nMult > 0))
65            {
66                nUnits += nMult * (*p++ - '0');
67                nMult /= 10;
68            }
69            break;
70        }
71        if (IsSpace(*p))
72            return std::nullopt;
73        if (!IsDigit(*p))
74            return std::nullopt;
75        strWhole.insert(strWhole.end(), *p);
76    }
77    if (*p) {
78        return std::nullopt;
79    }
80    if (strWhole.size() > 10) // guard against 63 bit overflow
81        return std::nullopt;
82    if (nUnits < 0 || nUnits > COIN)
83        return std::nullopt;
84    int64_t nWhole = LocaleIndependentAtoi<int64_t>(strWhole);
85    CAmount value = nWhole * COIN + nUnits;
86
87    if (!MoneyRange(value)) {
88        return std::nullopt;
89    }
90
91    return value;
92}
93