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Add a simple clock window to guitest2.

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This is driven by mousedown events right now, since there are no timers.
This commit is contained in:
Andreas Kling 2019-01-31 16:37:43 +01:00
parent 2dc9c86bad
commit e04ba0a83c
7 changed files with 113 additions and 10 deletions
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41
LibC/time.cpp
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@ -27,9 +27,46 @@ char* ctime(const time_t*)
return const_cast<char*>("ctime() not implemented");
}
struct tm* localtime(const time_t*)
inline bool is_leap_year(unsigned year)
{
assert(false);
return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400) == 0));
}
static void time_to_tm(struct tm* tm, time_t t)
{
static const unsigned seconds_per_day = 60 * 60 * 24;
static const unsigned days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
unsigned days = t / seconds_per_day;
unsigned rem = t % seconds_per_day;
tm->tm_sec = rem % 60;
rem /= 60;
tm->tm_min = rem % 60;
tm->tm_hour = rem / 60;
tm->tm_wday = (4 + days) % 7;
unsigned year;
for (year = 1970; days >= 365 + is_leap_year(year); ++year)
days -= 365 + is_leap_year(year);
tm->tm_year = year - 1900;
tm->tm_yday = days;
tm->tm_mday = 1;
if (is_leap_year(year) && days == 59)
++tm->tm_mday;
if (is_leap_year(year) && days >= 59)
--days;
unsigned month;
for (month = 0; month < 11 && days >= days_per_month[month]; ++month)
days -= days_per_month[month];
tm->tm_mon = month;
tm->tm_mday += days;
}
struct tm* localtime(const time_t* t)
{
if (!t)
return nullptr;
static struct tm tm_buf;
time_to_tm(&tm_buf, *t);
return &tm_buf;
}
long timezone = 0;