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//
// Copyright (C) 2004-2008 Maciej Sobczak, Stephen Hutton
// Copyright (C) 2017 Vadim Zeitlin.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
//
#define SOCI_SOURCE
#include "soci/error.h"
#include "soci-mktime.h"
#include <climits>
#include <cstdlib>
#include <ctime>
namespace // anonymous
{
// helper function for parsing decimal data (for std::tm)
int parse10(char const * & p1, char * & p2)
{
long v = std::strtol(p1, &p2, 10);
if (p2 != p1)
{
if (v < 0)
throw soci::soci_error("Negative date/time field component.");
if (v > INT_MAX)
throw soci::soci_error("Out of range date/time field component.");
p1 = p2 + 1;
// Cast is safe due to check above.
return static_cast<int>(v);
}
else
{
throw soci::soci_error("Cannot parse date/time field component.");
}
}
} // namespace anonymous
void soci::details::parse_std_tm(char const * buf, std::tm & t)
{
char const * p1 = buf;
char * p2;
char separator;
int a, b, c;
int year = 1900, month = 1, day = 1;
int hour = 0, minute = 0, second = 0;
a = parse10(p1, p2);
separator = *p2;
b = parse10(p1, p2);
c = parse10(p1, p2);
if (*p2 == ' ')
{
// there are more elements to parse
// - assume that what was already parsed is a date part
// and that the remaining elements describe the time of day
year = a;
month = b;
day = c;
hour = parse10(p1, p2);
minute = parse10(p1, p2);
second = parse10(p1, p2);
}
else
{
// only three values have been parsed
if (separator == '-')
{
// assume the date value was read
// (leave the time of day as 00:00:00)
year = a;
month = b;
day = c;
}
else
{
// assume the time of day was read
// (leave the date part as 1900-01-01)
hour = a;
minute = b;
second = c;
}
}
mktime_from_ymdhms(t, year, month, day, hour, minute, second);
}
// https://stackoverflow.com/a/58037981/15275
namespace
{
// Algorithm: https://howardhinnant.github.io/date_algorithms.html
int days_from_epoch ( int y, int m, int d )
{
y -= m <= 2;
const int era = y / 400;
const int yoe = y - era * 400; // [0, 399]
const int doy = ( 153 * ( m + ( m > 2 ? -3 : 9 ) ) + 2 ) / 5 + d - 1; // [0, 365]
const int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy; // [0, 146096]
return era * 146097 + doe - 719468;
}
} // namespace
time_t soci::details::timegm_impl_soci ( struct tm* tb )
{
int year = tb->tm_year + 1900;
int month = tb->tm_mon; // 0-11
if ( month > 11 )
{
year += month / 12;
month %= 12;
}
else if ( month < 0 )
{
const int years_diff = ( 11 - month ) / 12;
year -= years_diff;
month += 12 * years_diff;
}
const int days_since_epoch = days_from_epoch ( year, month + 1, tb->tm_mday );
time_t since_epoch = 60 * ( 60 * ( 24L * days_since_epoch + tb->tm_hour ) + tb->tm_min ) + tb->tm_sec;
struct tm tmp;
#ifdef _WIN32
gmtime_s ( &tmp, &since_epoch );
#else
gmtime_r ( &since_epoch, &tmp );
#endif // _WIN32
*tb = tmp;
return since_epoch;
}
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