TarsCpp/util/src/tc_common.cpp

/**
 * Tencent is pleased to support the open source community by making Tars available.
 *
 * Copyright (C) 2016THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except 
 * in compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * Unless required by applicable law or agreed to in writing, software distributed 
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 * specific language governing permissions and limitations under the License.
 */

#include "util/tc_common.h"
#include "util/tc_port.h"
#include <chrono>
#include <thread>

#if TARGET_PLATFORM_WINDOWS
#include <sys/timeb.h>
#pragma comment(lib, "ws2_32.lib")
#include "util/tc_strptime.h"
#endif

#include <signal.h>
#include <string.h>
#include <cmath>

namespace tars
{

#define MATCH_DOUBLE  \
if (vx.size() != vy.size()) { return false; } \
auto it1 = vx.begin(); auto it2 = vy.end(); \
while(it1 != vx.end() && it2 != vy.end() ) { \
	if (!equal(*it1, *it2, epsilon)) { return false; } \
	++it1; \
	++it2; \
} \
return true;

const float TC_Common::_EPSILON_FLOAT = 0.000001f;
const double TC_Common::_EPSILON_DOUBLE = 0.000001;

#if !TARGET_PLATFORM_WINDOWS
string TC_Common::TimezoneHelper::timezone_local;
#endif

int64_t TC_Common::TimezoneHelper::timezone_diff_secs = 0;

TC_Common::TimezoneHelper TC_Common::_TimeZoneHelper;

void TC_Common::sleep(uint32_t sec)
{
    std::this_thread::sleep_for(std::chrono::seconds(sec));
}

void TC_Common::msleep(uint32_t ms)
{
    std::this_thread::sleep_for(std::chrono::milliseconds(ms));
}

bool TC_Common::equal(double x, double y, double epsilon)
{
    return fabs(x - y) < epsilon;
}

bool TC_Common::equal(double x, double y, float epsilon)
{
    return equal(x ,y,(double)epsilon);
}

bool TC_Common::equal(float x, float y, float epsilon)
{
    return fabsf(x - y) < epsilon;
}

bool TC_Common::equal(float x, float y, double epsilon)
{
    return equal(x, y, float(epsilon));
}

bool TC_Common::equal(const vector<double>& vx, const vector<double>& vy, double epsilon)
{
	MATCH_DOUBLE
}

bool TC_Common::equal(const vector<double> &vx, const vector<double> &vy, float epsilon)
{
    return equal(vx, vy, double(epsilon));
}

bool TC_Common::equal(const vector<float> &vx, const vector<float> &vy, float epsilon)
{
	MATCH_DOUBLE
}

bool TC_Common::equal(const vector<float> &vx, const vector<float> &vy, double epsilon)
{
    return equal(vx, vy, float(epsilon));
}

bool TC_Common::equal(const set<double> & vx, const set<double>& vy, double epsilon)
{
	MATCH_DOUBLE
}

bool TC_Common::equal(const set<double>& vx, const set<double>& vy, float epsilon )
{
	return equal(vx, vy, double(epsilon));
}

bool TC_Common::equal(const set<float>& vx, const set<float> & vy, float epsilon)
{
	return equal(vx, vy, double(epsilon));
}

bool TC_Common::equal(const set<float>& vx, const set<float>& vy, double epsilon )
{
	MATCH_DOUBLE
}

bool TC_Common::equal(const unordered_set<double> & vx, const unordered_set<double>& vy, double epsilon)
{
	MATCH_DOUBLE
}

bool TC_Common::equal(const unordered_set<double>& vx, const unordered_set<double>& vy, float epsilon )
{
	return equal(vx, vy, double(epsilon));

}

bool TC_Common::equal(const unordered_set<float>& vx, const unordered_set<float> & vy, float epsilon)
{
	return equal(vx, vy, double(epsilon));
}

bool TC_Common::equal(const unordered_set<float>& vx, const unordered_set<float>& vy, double epsilon )
{
	MATCH_DOUBLE
}

template<>
string TC_Common::tostr<bool>(const bool &t)
{
    char buf[2];
    buf[0] = t ? '1' : '0';
    buf[1] = '\0';
    return string(buf);
}


template<>
string TC_Common::tostr<char>(const char &t)
{
    char buf[2];
    snprintf(buf, 2, "%c", t);
    return string(buf);
}

template<>
string TC_Common::tostr<unsigned char>(const unsigned char &t)
{
    char buf[2];
    snprintf(buf, 2, "%c", t);
    return string(buf);
}

template<>
string TC_Common::tostr<short>(const short &t)
{
    char buf[16];
    snprintf(buf, 16, "%d", t);
    return string(buf);
}

template<>
string TC_Common::tostr<unsigned short>(const unsigned short &t)
{
    char buf[16];
    snprintf(buf, 16, "%u", t);
    return string(buf);
}

template<>
string TC_Common::tostr<int>(const int &t)
{
    char buf[16];
    snprintf(buf, 16, "%d", t);
    return string(buf);
}

template<>
string TC_Common::tostr<unsigned int>(const unsigned int &t)
{
    char buf[16];
    snprintf(buf, 16, "%u", t);
    return string(buf);
}

template<>
string TC_Common::tostr<long>(const long &t)
{
    char buf[32];
    snprintf(buf, 32, "%ld", t);
    return string(buf);
}

template<>
string TC_Common::tostr<long long>(const long long &t)
{
    char buf[32];
    snprintf(buf, 32, "%lld", t);
    return string(buf);
}


template<>
string TC_Common::tostr<unsigned long>(const unsigned long &t)
{
    char buf[32];
    snprintf(buf, 32, "%lu", t);
    return string(buf);
}

template<>
string TC_Common::tostr<float>(const float &t)
{
    //C++11 to_string，默认保留后面6位小数
    string s = std::to_string(t);

    //去掉无效0, eg. 1.0300 -> 1.03;1.00 -> 1
    bool bFlag = false;
    int pos = int(s.size() - 1);
    for (; pos > 0; --pos)
    {
        if (s[pos] == '0')
        {
            bFlag = true;
            if (s[pos - 1] == '.')
            {
                //-2为了去掉"."号
                pos -= 2;
                break;
            }
        }
        else
        {
            break;
        }
    }

    if (bFlag)
        s = s.substr(0, pos + 1);

    return s;
}

template<>
string TC_Common::tostr<double>(const double &t)
{
    //C++11 to_string，默认保留后面6位小数
    string s = std::to_string(t);
    //去掉无效0, eg. 1.0300 -> 1.03;1.00 -> 1
    bool bFlag = false;
    int pos = int(s.size() - 1);
    for (; pos > 0; --pos)
    {
        if (s[pos] == '0')
        {
            bFlag = true;
            if (s[pos - 1] == '.')
            {
                //-2为了去掉"."号
                pos -= 2;
                break;
            }
        }
        else
        {
            break;
        }
    }

    if (bFlag)
        s = s.substr(0, pos + 1);

    return s;

}

template<>
string TC_Common::tostr<long double>(const long double &t)
{
    char buf[32];
    snprintf(buf, 32, "%Lf", t);
    string s(buf);

    //去掉无效0, eg. 1.0300 -> 1.03;1.00 -> 1
    bool bFlag = false;
    int pos = int(s.size() - 1);
    for (; pos > 0; --pos)
    {
        if (s[pos] == '0')
        {
            bFlag = true;
            if (s[pos - 1] == '.')
            {
                //-2为了去掉"."号
                pos -= 2;
                break;
            }
        }
        else
        {
            break;
        }
    }

    if (bFlag)
        s = s.substr(0, pos + 1);

    return s;

}

template<>
string TC_Common::tostr<std::string>(const std::string &t)
{
    return t;
}

string TC_Common::trim(const string &sStr, const string &s, bool bChar)
{
    if (sStr.empty())
    {
        return sStr;
    }

    /**
    * 将完全与s相同的字符串去掉
    */
    if (!bChar)
    {
        return trimright(trimleft(sStr, s, false), s, false);
    }

    return trimright(trimleft(sStr, s, true), s, true);
}

string TC_Common::trimleft(const string &sStr, const string &s, bool bChar)
{
    if (sStr.empty())
    {
        return sStr;
    }

    /**
    * 去掉sStr左边的字符串s
    */
    if (!bChar)
    {
        if (sStr.length() < s.length())
        {
            return sStr;
        }

        if (sStr.compare(0, s.length(), s) == 0)
        {
            return sStr.substr(s.length());
        }

        return sStr;
    }

    /**
    * 去掉sStr左边的 字符串s中的字符
    */
    string::size_type pos = 0;
    while (pos < sStr.length())
    {
        if (s.find_first_of(sStr[pos]) == string::npos)
        {
            break;
        }

        pos++;
    }

    if (pos == 0) return sStr;

    return sStr.substr(pos);
}

string TC_Common::trimright(const string &sStr, const string &s, bool bChar)
{
    if (sStr.empty())
    {
        return sStr;
    }

    /**
    * 去掉sStr右边的字符串s
    */
    if (!bChar)
    {
        if (sStr.length() < s.length())
        {
            return sStr;
        }

        if (sStr.compare(sStr.length() - s.length(), s.length(), s) == 0)
        {
            return sStr.substr(0, sStr.length() - s.length());
        }

        return sStr;
    }

    /**
    * 去掉sStr右边的 字符串s中的字符
    */
    string::size_type pos = sStr.length();
    while (pos != 0)
    {
        if (s.find_first_of(sStr[pos - 1]) == string::npos)
        {
            break;
        }

        pos--;
    }

    if (pos == sStr.length()) return sStr;

    return sStr.substr(0, pos);
}

string TC_Common::lower(const string &s)
{
    string sString = s;
    for (string::iterator iter = sString.begin(); iter != sString.end(); ++iter)
    {
        *iter = tolower(*iter);
    }

    return sString;
}

string TC_Common::upper(const string &s)
{
    string sString = s;

    for (string::iterator iter = sString.begin(); iter != sString.end(); ++iter)
    {
        *iter = toupper(*iter);
    }

    return sString;
}

bool TC_Common::isdigit(const string &sInput)
{
    string::const_iterator iter = sInput.begin();

    if (sInput.empty())
    {
        return false;
    }

    while (iter != sInput.end())
    {
        if (!::isdigit(*iter))
        {
            return false;
        }
        ++iter;
    }
    return true;
}

TC_Common::TimezoneHelper::TimezoneHelper()
{
	struct tm timeinfo;
	time_t secs, local_secs, gmt_secs;

	// UTC时间戳
	time(&secs);

	//带时区时间
	TC_Port::localtime_r(&secs, &timeinfo);
	local_secs = ::mktime(&timeinfo);
#if !TARGET_PLATFORM_WINDOWS
	timezone_local = string(timeinfo.tm_zone);
#endif

	//不带时区时间
	TC_Port::gmtime_r(&secs, &timeinfo);

	gmt_secs = ::mktime(&timeinfo);
	timezone_diff_secs = local_secs - gmt_secs;
}

int TC_Common::str2tm(const string &sString, const string &sFormat, struct tm &stTm)
{
	memset(&stTm, 0, sizeof(stTm));
    char *p = strptime(sString.c_str(), sFormat.c_str(), &stTm);
    return (p != NULL) ? 0 : -1;
}

time_t TC_Common::str2time(const string &sString, const string &sFormat)
{
    struct tm stTm;
    if (0 == str2tm(sString, sFormat, stTm))
    {
        //注意这里没有直接用mktime, mktime会访问时区文件, 会巨慢!
        return TC_Port::timegm(&stTm) - TimezoneHelper::timezone_diff_secs;
    }
    return 0;
}

int TC_Common::strgmt2tm(const string &sString, struct tm &stTm)
{
    return str2tm(sString, "%a, %d %b %Y %H:%M:%S GMT", stTm);
}

string TC_Common::tm2str(const struct tm &stTm, const string &sFormat)
{
    char sTimeString[255] = "\0";

    strftime(sTimeString, sizeof(sTimeString), sFormat.c_str(), &stTm);

    return string(sTimeString);
}

int TC_Common::gettimeofday(struct timeval &tv)
{
    return TC_Port::gettimeofday(tv);

}

void TC_Common::tm2time(const time_t &t, struct tm &tt)
{
    //加快速度, 否则会比较慢, 不用localtime_r(会访问时区文件, 较慢)
    time_t localt = t + TimezoneHelper::timezone_diff_secs;

    TC_Port::gmtime_r(&localt, &tt);

#if !TARGET_PLATFORM_WINDOWS
    static string local_timezone = TimezoneHelper::timezone_local;
    tt.tm_zone = const_cast<char *>(local_timezone.c_str());
    tt.tm_gmtoff = TimezoneHelper::timezone_diff_secs;
#endif
}

time_t TC_Common::UTC2LocalTime(const string& utcTimeStr)
{
	// 2022-06-07T18:04:37.703806784Z
	if (utcTimeStr.length() < 20 || utcTimeStr.at(10) != 'T' || utcTimeStr.back() != 'Z')
	{
		return 0;
	}
	return  TC_Common::str2time(utcTimeStr, "%Y-%m-%dT%H:%M:%S") + TimezoneHelper::timezone_diff_secs;
}

string TC_Common::tm2str(const time_t &t, const string &sFormat)
{
    struct tm tt;
    tm2time(t, tt);

    return tm2str(tt, sFormat);
}

void TC_Common::tm2tm(const time_t &t, struct tm &tt)
{
    tm2time(t, tt);
}

string TC_Common::now2str(const string &sFormat)
{
    time_t t = time(NULL);
    return tm2str(t, sFormat.c_str());
}

//string TC_Common::now2msstr()
//{
//    return ms2str(now2ms());
//}

string TC_Common::ms2str(int64_t ms)
{
    time_t t = ms / 1000;

    auto duration_in_ms = ms % 1000;
    tm tt;

    TC_Port::localtime_r(&t, &tt);

    string s;
    s.resize(128);
    const char *szFormat = "%04d-%02d-%02d %02d:%02d:%02d.%03ld";
    size_t n = snprintf(&s[0], s.size(), szFormat, tt.tm_year + 1900, tt.tm_mon + 1, tt.tm_mday, tt.tm_hour, tt.tm_min, tt.tm_sec, duration_in_ms);
    s.resize(n);

    return s;
}

string TC_Common::now2msstr()
{
    time_t t = time(NULL);

    auto duration_in_ms = now2ms();

    tm tt;

    TC_Port::localtime_r(&t, &tt);

    string s;
    s.resize(128);
    const char *szFormat = "%04d-%02d-%02d %02d:%02d:%02d.%03ld";
    size_t n = snprintf(&s[0], s.size(), szFormat, tt.tm_year + 1900, tt.tm_mon + 1, tt.tm_mday, tt.tm_hour, tt.tm_min, tt.tm_sec, duration_in_ms % 1000);
    s.resize(n);

    return s;
}

string TC_Common::now2GMTstr()
{
    time_t t = time(NULL);
    return tm2GMTstr(t);
}

string TC_Common::tm2GMTstr(const time_t &t)
{
    struct tm tt;

    TC_Port::gmtime_r(&t, &tt);
    return tm2str(tt, "%a, %d %b %Y %H:%M:%S GMT");
}

string TC_Common::tm2GMTstr(const struct tm &stTm)
{
    return tm2str(stTm, "%a, %d %b %Y %H:%M:%S GMT");
}

string TC_Common::nowdate2str()
{
    return now2str("%Y%m%d");
}

string TC_Common::nowtime2str()
{
    return now2str("%H%M%S");
}

int64_t TC_Common::now2ms()
{
    struct timeval tv;

    TC_Common::gettimeofday(tv);

    return tv.tv_sec * (int64_t) 1000 + tv.tv_usec / 1000;
}

int64_t TC_Common::now2us()
{
    struct timeval tv;

    TC_Common::gettimeofday(tv);

    return tv.tv_sec * (int64_t) 1000000 + tv.tv_usec;
}

//参照phorix的优化
static char c_b2s[256][4] = {"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f", "20", "21", "22",
                             "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f", "40", "41", "42", "43", "44", "45",
                             "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f", "60", "61", "62", "63", "64", "65", "66", "67", "68",
                             "69", "6a", "6b", "6c", "6d", "6e", "6f", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b",
                             "8c", "8d", "8e", "8f", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f", "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae",
                             "af", "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf", "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf", "d0", "d1",
                             "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df", "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef", "f0", "f1", "f2", "f3", "f4",
                             "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff"};

string TC_Common::bin2str(const void *buf, size_t len, const string &sSep, size_t lines)
{
    if (buf == NULL || len <= 0)
    {
        return "";
    }

    string sOut;
    const unsigned char *p = (const unsigned char *) buf;

    for (size_t i = 0; i < len; ++i, ++p)
    {
        sOut += c_b2s[*p][0];
        sOut += c_b2s[*p][1];
        sOut += sSep;

        //换行
        if ((lines != 0) && ((i + 1) % lines == 0))
        {
            sOut += "\n";
        }
    }

    return sOut;
}

string TC_Common::bin2str(const string &sBinData, const string &sSep, size_t lines)
{
    return bin2str((const void *) sBinData.data(), sBinData.length(), sSep, lines);
}

int TC_Common::str2bin(const char *psAsciiData, unsigned char *sBinData, int iBinSize)
{
    int iAsciiLength = (int) strlen(psAsciiData);

    int iRealLength = (iAsciiLength / 2 > iBinSize) ? iBinSize : (iAsciiLength / 2);
    for (int i = 0; i < iRealLength; i++)
    {
        sBinData[i] = x2c(psAsciiData + i * 2);
    }
    return iRealLength;
}

string TC_Common::str2bin(const string &sString, const string &sSep, size_t lines)
{
    const char *psAsciiData = sString.c_str();

    size_t iAsciiLength = sString.length();
    string sBinData;
    for (size_t i = 0; i < iAsciiLength; i++)
    {
        sBinData += x2c(psAsciiData + i);
        i++;
        i += sSep.length(); //过滤掉分隔符

        if (lines != 0 && sBinData.length() % lines == 0)
        {
            i++;    //过滤掉回车
        }
    }

    return sBinData;
}

char TC_Common::x2c(const string &sWhat)
{
    register char digit;

    if (sWhat.length() < 2)
    {
        return '\0';
    }

    digit = (sWhat[0] >= 'A' ? ((sWhat[0] & 0xdf) - 'A') + 10 : (sWhat[0] - '0'));
    digit *= 16;
    digit += (sWhat[1] >= 'A' ? ((sWhat[1] & 0xdf) - 'A') + 10 : (sWhat[1] - '0'));

    return (digit);
}

string TC_Common::replace(const string &sString, const string &sSrc, const string &sDest)
{
    if (sSrc.empty())
    {
        return sString;
    }

    string sBuf = sString;

    string::size_type pos = 0;

    while ((pos = sBuf.find(sSrc, pos)) != string::npos)
    {
        sBuf.replace(pos, sSrc.length(), sDest);
        pos += sDest.length();
    }

    return sBuf;
}

string TC_Common::replace(const string &sString, const map<string, string> &mSrcDest)
{
    if (sString.empty())
    {
        return sString;
    }

    string tmp = sString;
    map<string, string>::const_iterator it = mSrcDest.begin();

    while (it != mSrcDest.end())
    {

        string::size_type pos = 0;
        while ((pos = tmp.find(it->first, pos)) != string::npos)
        {
            tmp.replace(pos, it->first.length(), it->second);
            pos += it->second.length();
        }

        ++it;
    }

    return tmp;
}

bool TC_Common::matchPeriod(const string &s, const string &pat)
{
    if (s.empty())
    {
        return false;
    }

    if (pat.empty())
    {
        return true;
    }

    if (pat.find('*') == string::npos)
    {
        return s == pat;
    }

    string::size_type sIndex = 0;
    string::size_type patIndex = 0;
    do
    {
        if (pat[patIndex] == '*')
        {
            if (s[sIndex] == '.')
            {
                return false;
            }

            while (sIndex < s.size() && s[sIndex] != '.')
            {
                ++sIndex;
            }
            patIndex++;
        }
        else
        {
            if (pat[patIndex] != s[sIndex])
            {
                return false;
            }
            ++sIndex;
            ++patIndex;
        }
    } while (sIndex < s.size() && patIndex < pat.size());

    return sIndex == s.size() && patIndex == pat.size();
}

bool TC_Common::matchPeriod(const string &s, const vector<string> &pat)
{
    for (size_t i = 0; i < pat.size(); i++)
    {
        if (TC_Common::matchPeriod(s, pat[i]))
        {
            return true;
        }
    }
    return false;
}

#if TARGET_PLATFORM_LINUX || TARGET_PLATFORM_IOS

void TC_Common::daemon()
{
    pid_t pid;

    if ((pid = fork()) != 0)
    {
        exit(0);
    }

    setsid();

    signal(SIGINT, SIG_IGN);
    signal(SIGHUP, SIG_IGN);
    signal(SIGQUIT, SIG_IGN);
    signal(SIGPIPE, SIG_IGN);
    signal(SIGTTOU, SIG_IGN);
    signal(SIGTTIN, SIG_IGN);
    signal(SIGCHLD, SIG_IGN);
    signal(SIGTERM, SIG_IGN);
    ignorePipe();

    if ((pid = fork()) != 0)
    {
        //父进程结束,变成daemon
        exit(0);
    }

    umask(0);

    //  chdir("/");
}

void TC_Common::ignorePipe()
{
    struct sigaction sig;

    memset(&sig, 0, sizeof(struct sigaction));

    sig.sa_handler = SIG_IGN;
    sig.sa_flags = 0;
    sigemptyset(&sig.sa_mask);
    sigaction(SIGPIPE, &sig, NULL);
}

#endif

bool TC_Common::isPrimeNumber(size_t n)
{
    size_t nn = (size_t)sqrt((double)n);
    for(size_t i = 2; i <= nn;i++)
    {
        if (n % i == 0)
        {
            return false;
        }
    }
    return true;
}

size_t TC_Common::toSize(const string &s, size_t iDefaultSize)
{
    if (s.empty())
    {
        return iDefaultSize;
    }

    char c = s[s.length() - 1];
    if (c != 'K' && c != 'M' && c != 'G' && TC_Common::trim(s) == TC_Common::tostr(TC_Common::strto<size_t>(s)))
    {
        //没有后缀, 且转换是正确的
        return (size_t) (TC_Common::strto<size_t>(s));
    }
    else if (c == 'K' || c == 'M' || c == 'G')
    {
        if (s.length() == 1)
        {
            return iDefaultSize;
        }

        float n = TC_Common::strto<float>(s.substr(0, s.length() - 1));

        if (TC_Common::trim(s.substr(0, s.length() - 1)) != TC_Common::tostr(n))
        {
            return iDefaultSize;
        }

        if (c == 'K')
        {
            return (size_t) (n * 1024);
        }
        if (c == 'M')
        {
            return (size_t) (n * 1024 * 1024);
        }
        if (c == 'G')
        {
            return (size_t) (n * 1024 * 1024 * 1024);
        }
    }

    return iDefaultSize;
}

string TC_Common::getHostName()
{
    string hostName;
    char buff[256] = {0};
    int ret = ::gethostname(buff, sizeof(buff));
    if (0 == ret)
    {
        hostName = string(buff);
    }
    else
    {
        // 获取不到host， 则直接传空串。
    }
    return hostName;
}


#if TARGET_PLATFORM_LINUX || TARGET_PLATFORM_IOS

// Generate the randome string, a SHA1-sized random number
void TC_Common::getRandomHexChars(char *p, unsigned int len)
{
    const char *const chars = "0123456789abcdef";
    FILE *fp = fopen("/dev/urandom", "r");
    if (!fp || fread(p, len, 1, fp) == 0)
    {
        for (unsigned int j = 0; j < len; j++)
            p[j] ^= rand();
    }

    if (fp) fclose(fp);

    for (unsigned int j = 0; j < len; j++)
        p[j] = chars[p[j] & 0x0F];

}

#endif

string TC_Common::nextDate(const string &sDate)
{
    time_t tomorrow = TC_Common::str2time(sDate + "000000", "%Y%m%d%H%M%S") + 60 * 60 * 24;

    return TC_Common::tm2str(tomorrow, "%Y%m%d");
}

string TC_Common::prevDate(const string &sDate)
{
    time_t tomorrow = TC_Common::str2time(sDate + "000000", "%Y%m%d%H%M%S") - 60 * 60 * 24;

    return TC_Common::tm2str(tomorrow, "%Y%m%d");
}

int TC_Common::nextDate(int iDate)
{
    return TC_Common::strto<int>(nextDate(TC_Common::tostr(iDate)));
}

int TC_Common::prevDate(int iDate)
{
    return TC_Common::strto<int>(prevDate(TC_Common::tostr(iDate)));
}

string TC_Common::nextMonth(const string &sMonth)
{
    if (sMonth.length() != 6)
    {
        return "197001";
    }
    int year = TC_Common::strto<int>(sMonth.substr(0, 4));
    int month = TC_Common::strto<int>(sMonth.substr(4, 2));

    int monthNew = month + 1;
    int yearNew = year;
    if (monthNew == 13)
    {
        monthNew = 1;
        yearNew = year + 1;
    }

    yearNew = (yearNew >= 1970 && yearNew <= 9999) ? yearNew : 1970;
    monthNew = (monthNew >= 1 && monthNew <= 12) ? monthNew : 0;

    char szMonth[4] = {0};
    snprintf(szMonth, sizeof(szMonth) - 1, "%02d", monthNew);
    return TC_Common::tostr(yearNew) + szMonth;
}

string TC_Common::prevMonth(const string &sMonth)
{
    if (sMonth.length() != 6)
    {
        return "197001";
    }
    int year = TC_Common::strto<int>(sMonth.substr(0, 4));
    int month = TC_Common::strto<int>(sMonth.substr(4, 2));

    int monthNew = month - 1;
    int yearNew = year;
    if (monthNew == 0)
    {
        monthNew = 12;
        yearNew = year - 1;
    }
    yearNew = (yearNew >= 1970 && yearNew <= 9999) ? yearNew : 1970;
    monthNew = (monthNew >= 1 && monthNew <= 12) ? monthNew : 0;

    char szMonth[4] = {0};
    snprintf(szMonth, sizeof(szMonth) - 1, "%02d", monthNew);
    return TC_Common::tostr(yearNew) + szMonth;
}

string TC_Common::nextYear(const string &sYear)
{
    if (sYear.length() != 4)
    {
        return "1970";
    }
    int year = TC_Common::strto<int>(sYear.substr(0, 4));
    int yearNew = year + 1;

    yearNew = (yearNew >= 1970 && yearNew <= 9999) ? yearNew : 1970;

    return TC_Common::tostr(yearNew);
}

string TC_Common::prevYear(const string &sYear)
{
    if (sYear.length() != 4)
    {
        return "1970";
    }
    int year = TC_Common::strto<int>(sYear.substr(0, 4));
    int yearNew = year - 1;

    yearNew = (yearNew >= 1970 && yearNew <= 9999) ? yearNew : 1970;

    return TC_Common::tostr(yearNew);
}

int TC_Common::secondsToDateInt(time_t seconds)
{
    struct tm tt;

    TC_Common::tm2tm(seconds, tt);
    return (1900 + tt.tm_year) * 10000 + (tt.tm_mon + 1) * 100 + tt.tm_mday;
}

string TC_Common::secondsToDateString(time_t seconds)
{
    return TC_Common::tostr(secondsToDateInt(seconds));
}

string TC_Common::secondsToMondayString(time_t seconds)
{
    //换到周一
    int week = TC_Common::strto<int>(TC_Common::tm2str(seconds, "%w"));
    seconds -= (week - 1) * 86400;

    return TC_Common::tm2str(seconds, "%Y%m%d");
}

string TC_Common::secondsToMonthString(time_t seconds)
{
    return TC_Common::tm2str(seconds, "%Y-%m");
}

string TC_Common::msToTimeString(int64_t ms)
{

    int64_t sec = ms / 1000;
    int64_t msec = ms % 1000;

    char szMS[5] = {0};
    snprintf(szMS, sizeof(szMS) - 1, "%03d", (int) msec);

    return TC_Common::tm2str(sec, "%Y%m%d-%H%M%S-") + string(szMS);
}


int64_t TC_Common::timeStringToMs(const string &timeStr)
{
    vector<string> vt = TC_Common::sepstr<string>(timeStr, "-");
    if (vt.size() != 3)
    {
        return 0;
    }

    string &date = vt[0];
    string &time = vt[1];
    string &ms = vt[2];

    if (date.size() != 8 || time.size() != 6 || ms.size() != 3)
    {
        return 0;
    }

    int64_t lsec = TC_Common::str2time(date + time);
    int64_t lms = TC_Common::strto<int64_t>(ms);

    return lsec * 1000 + lms;
}

bool TC_Common::getSectionFromMs(int64_t ms, string &date, string &time, string &mstick)
{
    string timeStr = msToTimeString(ms);
    vector<string> vt = TC_Common::sepstr<string>(timeStr, "-");
    if (vt.size() != 3)
    {
        return false;
    }

    date = vt[0];
    time = vt[1];
    mstick = vt[2];

    return true;
}

string TC_Common::getDateFromMs(int64_t ms)
{
    string date;
    string time;
    string mstick;
    if (!getSectionFromMs(ms, date, time, mstick))
    {
        return "00000000";
    }

    return date;
}

string TC_Common::getTimeFromMs(int64_t ms)
{
    string date;
    string time;
    string mstick;
    if (!getSectionFromMs(ms, date, time, mstick))
    {
        return "000000";
    }

    return time;
}

int TC_Common::msToNowSeconds(int64_t ms)
{
    int64_t sec = ms / 1000;

    //换成当天的秒
    int64_t now = TC_Common::str2time(TC_Common::tm2str(sec, "%Y%m%d") + "000000", "%Y%m%d%H%M%S");

    return (sec - now);
}

int TC_Common::nowDaySeconds()
{
    return TC_Common::msToNowSeconds(TC_Common::now2ms());
}

int64_t TC_Common::msToNowMs(int64_t ms)
{
    int64_t sec = ms / 1000;

    //换成当天的秒
    int64_t now = TC_Common::str2time(TC_Common::tm2str(sec, "%Y%m%d") + "000000", "%Y%m%d%H%M%S");

    return now * 1000;
}

int64_t TC_Common::us()
{
    struct timeval tv;
    TC_Common::gettimeofday(tv);
    return tv.tv_sec * (int64_t) 1000000 + tv.tv_usec;
}

int64_t TC_Common::dateToMs(const string &sDate)
{
    int64_t now;

    if (sDate.find('-') != string::npos)
    {
        now = TC_Common::str2time(sDate + "000000", "%Y-%m-%d%H%M%S");
    }
    else
    {
        //换成当天的秒
        now = TC_Common::str2time(sDate + "000000", "%Y%m%d%H%M%S");
    }

    return now * 1000;
}

int64_t TC_Common::dateToSecond(const string &sDate)
{
    int64_t now;

    if (sDate.find('-') != string::npos)
    {
        now = TC_Common::str2time(sDate + "000000", "%Y-%m-%d%H%M%S");
    }
    else
    {
        //换成当天的秒
        now = TC_Common::str2time(sDate + "000000", "%Y%m%d%H%M%S");
    }

    return now;
}

int TC_Common::dateTo(const string &sDate, const string &sPeriod)
{
    if (sPeriod == "W")
    {
        return dateToWeek(sDate);
    }
    else if (sPeriod == "M")
    {
        return dateToMonth(sDate);
    }
    else if (sPeriod == "Q")
    {
        return dateToSeason(sDate);
    }
    else if (sPeriod == "S")
    {
        return dateToHalfYear(sDate);
    }
    else if (sPeriod == "Y")
    {
        return dateToYear(sDate);
    }

    return 0;
}

int TC_Common::dateToWeekday(const string &sDate)
{
    struct tm date;
    TC_Common::str2tm(sDate, "%Y%m%d", date);

    return date.tm_wday;
}

int TC_Common::dateToWeek(const string &sDate)
{
    struct tm date;
    TC_Common::str2tm(sDate, "%Y%m%d", date);

    return TC_Common::strto<int>(TC_Common::tm2str(date, "%W"));
}

int TC_Common::dateToMonth(const string &sDate)
{
    return TC_Common::strto<int>(sDate.substr(4, 2));
}

int TC_Common::dateToSeason(const string &sDate)
{
    string month = sDate.substr(4, 2);
    if (month == "01" || (month == "02") || (month == "03"))
    {
        return 1;
    }
    else if (month == "04" || (month == "05") || (month == "06"))
    {
        return 2;
    }
    else if (month == "07" || (month == "08") || (month == "09"))
    {
        return 3;
    }
    else if (month == "10" || (month == "11") || (month == "12"))
    {
        return 4;
    }

    return 0;
}

int TC_Common::dateToHalfYear(const string &sDate)
{
    string month = sDate.substr(4, 2);
    if (month == "01" || (month == "02") || (month == "03") || (month == "04") || (month == "05") || (month == "06"))
    {
        return 1;
    }
    else if (month == "07" || (month == "08") || (month == "09") || (month == "10") || (month == "11") || (month == "12"))
    {
        return 2;
    }

    return 0;
}

int TC_Common::dateToYear(const string &sDate)
{
    return TC_Common::strto<int>(sDate.substr(0, 4));
}

int64_t TC_Common::timeToDaySec(int64_t hour, int64_t min)
{
    return hour * 3600 + min * 60;
}

int64_t TC_Common::getNextAbsClockMs(int64_t clockSec)
{
    int64_t now = TC_Common::now2ms();
    int64_t nowSec = TC_Common::msToNowSeconds(now);
    int64_t currentDateMs = TC_Common::dateToMs(TC_Common::getDateFromMs(now));

    //如果已经超过了通知时间,则改到第二天继续通知
    int64_t notityRealTimeMs = 0;
    if (nowSec > clockSec + 1)
    {
        notityRealTimeMs = currentDateMs + clockSec * 1000 + ONE_DAY_MS;
    }
    else
    {
        notityRealTimeMs = currentDateMs + clockSec * 1000;
    }

    return notityRealTimeMs;
}


int TC_Common::nextDate(int iDate, int offset)
{
    if (offset == 0)
    {
        return iDate;
    }
    else if (offset < 0)
    {
        return prevDate(iDate, std::abs(offset));
    }
    time_t t = TC_Common::str2time(TC_Common::tostr(iDate * 1000000LL));
    t = t + ONE_DAY_SEC * offset;
    return TC_Common::strto<int>(TC_Common::tm2str(t, "%Y%m%d"));
}

int TC_Common::prevDate(int iDate, int offset)
{
    if (offset == 0)
    {
        return iDate;
    }
    else if (offset < 0)
    {
        return nextDate(iDate, std::abs(offset));
    }
    time_t t = TC_Common::str2time(TC_Common::tostr(iDate * 1000000LL));
    t = t - ONE_DAY_SEC * offset;
    return TC_Common::strto<int>(TC_Common::tm2str(t, "%Y%m%d"));
}

int TC_Common::lastDate(int iDate, const char period)
{
    if (period == 'D')
    {
        return iDate;
    }
    switch (period)
    {
        case 'W': // 周日为一周的开始, 周六结束
        {
            struct tm t;
            int rc = TC_Common::str2tm(TC_Common::tostr(iDate), "%Y%m%d", t);
            if (rc != 0)
            {
                return rc;
            }
            if (t.tm_wday == 6)
            {
                return iDate;
            }

            int offset = 6 - t.tm_wday; // 下周六
            return nextDate(iDate, offset);
        }
        case 'M': // 下月一号的上一天是一个月的开始
        {
            int month = iDate / 10000;
            month = iDate - month * 10000;
            month = month / 100;
            int monthDateStart = ((iDate / 10000)) * 10000 + (month + 1) * 100 + 1; // 下月初
            if (month == 12)
            {
                monthDateStart = ((iDate / 10000) + 1) * 10000 + (0 + 1) * 100 + 1; // 下年一月初
            }
            return prevDate(monthDateStart, 1); // 上一天: 上月底
        }
        case 'Q': // 331, 630, 930, 1231
        {
            const int seasonDateEnd[4] = {331, 630, 930, 1231};
            std::function<int(int)> date2season = [](int date)
            {
                int month = date / 10000;
                month = date - month * 10000;
                month = month / 100;
                return ((month - 1) / 3);
            };
            return ((iDate / 10000)) * 10000 + seasonDateEnd[date2season(iDate)];
        }
        case 'S': // 631, 1231
        {
            int tmp = ((iDate / 10000)) * 10000 + 631;
            if (iDate > tmp)
            {
                return ((iDate / 10000)) * 10000 + 1231;
            }
            else
            {
                return tmp;
            }
        }
            break;
        case 'Y': // 1231
        {
            return ((iDate / 10000)) * 10000 + 1231;
        }
        default:
            return -1;
    }
}

// 判断两个日期是否在同一周期中
inline bool TC_Common::matchPeriod(int lastDate, int date, const std::string &period)
{
    if (lastDate == 0 || date == 0)
    {
        return false;
    }
    if (period == "W")
    {
        int a = TC_Common::dateToWeek(TC_Common::tostr(lastDate));
        int b = TC_Common::dateToWeek(TC_Common::tostr(date));
        return a == b;
    }
    else if (period == "M")
    {
        int a = TC_Common::dateToMonth(TC_Common::tostr(lastDate));
        int b = TC_Common::dateToMonth(TC_Common::tostr(date));
        return a == b;
    }
    else if (period == "Q")
    {
        int a = TC_Common::dateToSeason(TC_Common::tostr(lastDate));
        int b = TC_Common::dateToSeason(TC_Common::tostr(date));
        return a == b;
    }
    else if (period == "S")
    {
        int a = TC_Common::dateToHalfYear(TC_Common::tostr(lastDate));
        int b = TC_Common::dateToHalfYear(TC_Common::tostr(date));
        return a == b;
    }
    else if (period == "Y")
    {
        int a = TC_Common::dateToYear(TC_Common::tostr(lastDate));
        int b = TC_Common::dateToYear(TC_Common::tostr(date));
        return a == b;
    }
    return false;
}

int TC_Common::getMatchPeriodDays(const std::vector<int> &days, const std::pair<string, int> &period, std::vector<int> &matchDays)
{
    std::map<std::string, int> periodList{{"W", 5},
                                          {"M", 25},
                                          {"Q", 25 * 3},
                                          {"S", 25 * 3 * 2},
                                          {"Y", 256}};
    std::string p = TC_Common::upper(period.first);
    if (periodList.find(p) == periodList.end())
    {
        return -1;
    }
    else if ((periodList.at(p) < std::abs(period.second)) || period.second == 0)
    {
        return -1;
    }

    // 按周期切片
    std::vector<std::vector<int>> slice;
    int lastDate = 0;
    int idx = 0;
    for (auto const d : days)
    {
        if (d <= 0)
        {
            continue;
        }
        // 第一次必然不匹配 lastDate == 0
        if (!TC_Common::matchPeriod(d, lastDate, p))
        {
            lastDate = d;
            slice.emplace_back(std::vector<int>());
            idx++;
        }
        slice[idx - 1].push_back(d);
    }

    // 在周期切片中按下标取对应的数据
    for (auto const &v : slice)
    {
        if (std::abs(period.second) > v.size())
        {
            continue;
        }
        if (period.second > 0)
        {
            matchDays.push_back(v.at(period.second - 1));
        }
        else if (period.second < 0)
        {
            matchDays.push_back(v.at(v.size() + period.second));
        }
    }
    return 0;
}

}