TimeConverter::ExactTimestamp TimeConverter::fromString(const std::string &str) const
{
struct tm bt;
// parse input string
sscanf(str.c_str(), "%04u-%02u-%02uT%02u:%02u:%02u",
&bt.tm_year, &bt.tm_mon, &bt.tm_mday,
&bt.tm_hour, &bt.tm_min, &bt.tm_sec);
// fix some ranges and variables
bt.tm_year -=1900;
bt.tm_mon -=1;
bt.tm_isdst =-1; // auto-detect day-light-saving
// convert to time_t
const time_t tsLocal=mktime(&bt);
// test if mktime() explicitly (?!) returned an error
if( tsLocal==static_cast<time_t>(-1) )
throw ExceptionInvalidTime(SYSTEM_SAVE_LOCATION, str, "mktime() returned error");
// fix to skip local timezone
const time_t tsRead=tsLocal+bt.tm_gmtoff;
// check timezone offset
const char *tzPart =str.c_str()+(4+1 + 2+1 + 2 + 1 +2+1 + 2+1 +2);
ParsedFraction fracTmp=parseFraction(str, tzPart);
assert(fracTmp.first>=0);
assert(fracTmp.first< 1);
const int tzOffset=parseTimezoneOffset(str, fracTmp.second);
// compute actual time
const time_t utcTime =tsRead+tzOffset;
// return final result
return ExactTimestamp( Persistency::Timestamp(utcTime), fracTmp.first );
}
static double parse_time(const char * time) {
unsigned vTotal = 0, vCur = 0;
for(;;) {
char c = *time++;
if (c == 0) return (double) (vTotal + vCur);
else if (pfc::char_is_numeric( c ) ) {
vCur = vCur * 10 + (unsigned)(c-'0');
} else if (c == ':') {
if (vCur >= 60) {PFC_ASSERT(!"Invalid input"); return 0; }
vTotal += vCur; vCur = 0; vTotal *= 60;
} else if (c == '.') {
return (double) (vTotal + vCur) + parseFraction(time);
} else {
PFC_ASSERT(!"Invalid input"); return 0;
}
}
}