eic-opticks/sysrap/s_time.h

0001 #pragma once
0002 /**
0003 s_time.h
0004 ==========================================================
0005
0006 This follows the approach of plog.
0007 Good for string time stamps, but not convenient for
0008 measuring durations. See schrono.h or stimer.h for that.
0009
0010 **/
0011
0012 #include <sys/time.h>
0013 #include <string>
0014 #include <iomanip>
0015 #include <sstream>
0016
0017 namespace s_time
0018 {
0019     inline int EpochSeconds()
0020     {
0021         time_t now = time(0);
0022         return now ;
0023     }
0024
0025     constexpr const char* FMT = "%Y%m%d_%H%M%S" ;
0026
0027     inline std::string Format(int epochseconds=0, const char* fmt=nullptr)
0028     {
0029         const char* ufmt = fmt == nullptr ? FMT : fmt ;
0030
0031         int t = epochseconds == 0 ? EpochSeconds() : epochseconds ;
0032         time_t now(t) ;
0033         struct tm  tstruct;
0034         char       buf[80];
0035         tstruct = *localtime(&now);
0036         strftime(buf, sizeof(buf), ufmt, &tstruct);
0037         return buf ;
0038     }
0039
0040     inline std::string Stamp()
0041     {
0042         return Format(0, nullptr);
0043     }
0044     inline std::string Now()
0045     {
0046         return Format(0, "%c");
0047     }
0048
0049
0050     inline void localtime_s(struct tm* t, const time_t* time)
0051     {
0052         ::localtime_r(time, t);
0053     }
0054
0055     struct Time
0056     {
0057         time_t time;
0058         unsigned short millitm;
0059     };
0060
0061     inline void init(Time* stamp)  // ftime in plog
0062     {
0063         timeval tv;
0064         ::gettimeofday(&tv, NULL); // 2nd arg is obsolete timezone
0065
0066         stamp->time = tv.tv_sec;
0067         stamp->millitm = static_cast<unsigned short>(tv.tv_usec / 1000);
0068     }
0069
0070     inline std::string Desc(Time* stamp)
0071     {
0072          tm t ;
0073          localtime_s(&t, &stamp->time) ;
0074
0075          std::stringstream ss ;
0076          ss
0077             << t.tm_year + 1900
0078             << "-"
0079             << std::setfill('0')
0080             << std::setw(2) << t.tm_mon + 1
0081             << "-"
0082             << std::setfill('0')
0083             << std::setw(2) << t.tm_mday
0084             << " "
0085             << std::setfill('0')
0086             << std::setw(2) << t.tm_hour
0087             << ":"
0088             << std::setfill('0')
0089             << std::setw(2) << t.tm_min
0090             << ":"
0091             << std::setfill('0')
0092             << std::setw(2) << t.tm_sec
0093             << "."
0094             << std::setfill('0')
0095             << std::setw(3) << static_cast<int> (stamp->millitm)
0096             << " "
0097             << std::endl
0098             ;
0099          std::string s = ss.str();
0100          return s ;
0101      }
0102 };
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