105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
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/*
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1 Interval.cpp
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Helper class for defining and handling a time interval.
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*/
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#include "interpolate.h"
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#include <ctime>
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#include <cstdio>
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/*
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1.1 ~timestr~ converts a unix timestamp (ms since 1970-01-01 00:00:00)
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into a string of the form YYYY-mm-dd-HH:MM:ss.SSS
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*/
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static string timestr(double t) {
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struct tm *tm;
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char buf[32], ret[40];
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time_t ti;
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ti = t/1000;
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tm = gmtime(&ti);
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strftime(buf, sizeof(buf), "%F-%T", tm);
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sprintf(ret, "%s.%03d", buf, (int) fmod(t,1000));
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return ret;
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}
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// Helper-function to convert a struct tm interpreted as UTC to unix epoch
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static double utctime (struct tm *tm) {
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char *tz;
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double ret;
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tz = getenv("TZ");
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setenv("TZ", "UTC", 1);
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tzset();
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ret = mktime(tm);
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if (tz)
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setenv("TZ", tz, 1);
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else
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unsetenv("TZ");
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tzset();
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return ret;
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}
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/*
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1.2 ~parsetime~ converts a string of the form YYYY-mm-dd HH:MM:ss.SSS into
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a unix timestamp (ms since 1970-01-01 00:00:00)
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*/
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static double parsetime (string str) {
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struct tm tm;
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unsigned int msec;
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char sep; // Separator, space or -
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tm.tm_year = tm.tm_mon = tm.tm_mday = 0;
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tm.tm_sec = tm.tm_min = tm.tm_hour = tm.tm_isdst = msec = 0;
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sscanf(str.c_str(), "%u-%u-%u%c%u:%u:%u.%u",
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&tm.tm_year, &tm.tm_mon, &tm.tm_mday, &sep,
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&tm.tm_hour, &tm.tm_min, &tm.tm_sec,
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&msec);
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tm.tm_year -= 1900; // struct tm expects years since 1900
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tm.tm_mon--; // struct tm expects months to be numbered from 0 - 11
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double ret = utctime(&tm) * 1000 + msec;
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return ret;
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}
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/*
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1.3 ~startstr~ returns a textual representation of the beginning of
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the time interval.
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*/
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string Interval::startstr() {
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return timestr(start);
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}
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/*
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1.4 ~endstr~ returns a textual representation of the end of
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the time interval.
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*/
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string Interval::endstr() {
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return timestr(end);
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}
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/*
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1.5 Constructor for a time interval.
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Parameters:
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st : Date/Time string in the format of 1.2
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en : Date/Time string in the format of 1.2
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lc : FALSE, if the interval is left-open
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rc : FALSE, if the interval is right-open
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*/
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Interval::Interval(string st, string en, bool lc, bool rc) : lc(lc), rc(rc) {
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start = parsetime(st);
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end = parsetime(en);
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}
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