converts the time even on 32-bit systems. Whether you have 64-bit time
values will depend on the operating system.
-localtime64_r() is a 64-bit equivalent of localtime_r().
+S_localtime64_r() is a 64-bit equivalent of localtime_r().
-gmtime64_r() is a 64-bit equivalent of gmtime_r().
+S_gmtime64_r() is a 64-bit equivalent of gmtime_r().
*/
static const int length_of_year[2] = { 365, 366 };
/* Number of days in a 400 year Gregorian cycle */
-static const int years_in_gregorian_cycle = 400;
+static const Year years_in_gregorian_cycle = 400;
static const int days_in_gregorian_cycle = (365 * 400) + 100 - 4 + 1;
/* 28 year calendar cycle between 2010 and 2037 */
-static const int safe_years[28] = {
+#define SOLAR_CYCLE_LENGTH 28
+static const int safe_years[SOLAR_CYCLE_LENGTH] = {
2016, 2017, 2018, 2019,
2020, 2021, 2022, 2023,
2024, 2025, 2026, 2027,
2012, 2013, 2014, 2015
};
-#define SOLAR_CYCLE_LENGTH 28
static const int dow_year_start[SOLAR_CYCLE_LENGTH] = {
5, 0, 1, 2, /* 0 2016 - 2019 */
3, 5, 6, 0, /* 4 */
#define IS_LEAP(n) ((!(((n) + 1900) % 400) || (!(((n) + 1900) % 4) && (((n) + 1900) % 100))) != 0)
#define WRAP(a,b,m) ((a) = ((a) < 0 ) ? ((b)--, (a) + (m)) : (a))
-#define SHOULD_USE_SYSTEM_LOCALTIME(a) ( \
- USE_SYSTEM_LOCALTIME && \
+#ifdef USE_SYSTEM_LOCALTIME
+# define SHOULD_USE_SYSTEM_LOCALTIME(a) ( \
(a) <= SYSTEM_LOCALTIME_MAX && \
(a) >= SYSTEM_LOCALTIME_MIN \
)
-#define SHOULD_USE_SYSTEM_GMTIME(a) ( \
- USE_SYSTEM_GMTIME && \
+#else
+# define SHOULD_USE_SYSTEM_LOCALTIME(a) (0)
+#endif
+
+#ifdef USE_SYSTEM_GMTIME
+# define SHOULD_USE_SYSTEM_GMTIME(a) ( \
(a) <= SYSTEM_GMTIME_MAX && \
(a) >= SYSTEM_GMTIME_MIN \
)
+#else
+# define SHOULD_USE_SYSTEM_GMTIME(a) (0)
+#endif
+/* Multi varadic macros are a C99 thing, alas */
+#ifdef TIME_64_DEBUG
+# define TIME64_TRACE(format) (fprintf(stderr, format))
+# define TIME64_TRACE1(format, var1) (fprintf(stderr, format, var1))
+# define TIME64_TRACE2(format, var1, var2) (fprintf(stderr, format, var1, var2))
+# define TIME64_TRACE3(format, var1, var2, var3) (fprintf(stderr, format, var1, var2, var3))
+#else
+# define TIME64_TRACE(format) ((void)0)
+# define TIME64_TRACE1(format, var1) ((void)0)
+# define TIME64_TRACE2(format, var1, var2) ((void)0)
+# define TIME64_TRACE3(format, var1, var2, var3) ((void)0)
+#endif
-int _is_exception_century(Int64 year)
+static int S_is_exception_century(Year year)
{
int is_exception = ((year % 100 == 0) && !(year % 400 == 0));
- /* printf("is_exception_century: %s\n", is_exception ? "yes" : "no"); */
+ TIME64_TRACE1("# is_exception_century: %s\n", is_exception ? "yes" : "no");
return(is_exception);
}
-/* timegm() is a GNU extension, so emulate it here if we need it */
-#ifdef HAS_TIMEGM
-# define TIMEGM(n) timegm(n);
-#else
-# define TIMEGM(n) ((time_t)timegm64(n));
-#endif
-
-Time64_T timegm64(struct tm *date) {
- int days = 0;
- Int64 seconds = 0;
- Int64 year;
+static Time64_T S_timegm64(struct TM *date) {
+ int days = 0;
+ Time64_T seconds = 0;
+ Year year;
if( date->tm_year > 70 ) {
year = 70;
seconds += date->tm_min * 60;
seconds += date->tm_sec;
- return((Time64_T)seconds);
+ return(seconds);
}
-int _check_tm(struct tm *tm)
+#ifdef DEBUGGING
+static int S_check_tm(struct TM *tm)
{
/* Don't forget leap seconds */
assert(tm->tm_sec >= 0);
return 1;
}
+#endif
/* The exceptional centuries without leap years cause the cycle to
shift by 16
*/
-Year _cycle_offset(Year year)
+static Year S_cycle_offset(Year year)
{
const Year start_year = 2000;
Year year_diff = year - start_year;
exceptions = year_diff / 100;
exceptions -= year_diff / 400;
- /*
- fprintf(stderr, "# year: %lld, exceptions: %lld, year_diff: %lld\n",
- year, exceptions, year_diff);
- */
+ TIME64_TRACE3("# year: %lld, exceptions: %lld, year_diff: %lld\n",
+ year, exceptions, year_diff);
return exceptions * 16;
}
It doesn't need the same leap year status since we only care about
January 1st.
*/
-int _safe_year(Year year)
+static int S_safe_year(Year year)
{
int safe_year;
- Year year_cycle = year + _cycle_offset(year);
+ Year year_cycle = year + S_cycle_offset(year);
/* Change non-leap xx00 years to an equivalent */
- if( _is_exception_century(year) )
+ if( S_is_exception_century(year) )
year_cycle += 11;
/* Also xx01 years, since the previous year will be wrong */
- if( _is_exception_century(year - 1) )
+ if( S_is_exception_century(year - 1) )
year_cycle += 17;
year_cycle %= SOLAR_CYCLE_LENGTH;
assert(safe_year <= 2037 && safe_year >= 2010);
- /*
- printf("year: %d, year_cycle: %d, safe_year: %d\n",
- year, year_cycle, safe_year);
- */
+ TIME64_TRACE3("# year: %lld, year_cycle: %lld, safe_year: %d\n",
+ year, year_cycle, safe_year);
return safe_year;
}
+static void S_copy_little_tm_to_big_TM(const struct tm *src, struct TM *dest) {
+ if( src == NULL ) {
+ memset(dest, 0, sizeof(*dest));
+ }
+ else {
+# ifdef USE_TM64
+ dest->tm_sec = src->tm_sec;
+ dest->tm_min = src->tm_min;
+ dest->tm_hour = src->tm_hour;
+ dest->tm_mday = src->tm_mday;
+ dest->tm_mon = src->tm_mon;
+ dest->tm_year = (Year)src->tm_year;
+ dest->tm_wday = src->tm_wday;
+ dest->tm_yday = src->tm_yday;
+ dest->tm_isdst = src->tm_isdst;
+
+# ifdef HAS_TM_TM_GMTOFF
+ dest->tm_gmtoff = src->tm_gmtoff;
+# endif
+
+# ifdef HAS_TM_TM_ZONE
+ dest->tm_zone = src->tm_zone;
+# endif
+
+# else
+ /* They're the same type */
+ memcpy(dest, src, sizeof(*dest));
+# endif
+ }
+}
+
+
+#ifndef HAS_LOCALTIME_R
/* Simulate localtime_r() to the best of our ability */
-struct tm * fake_localtime_r(const time_t *clock, struct tm *result) {
+static struct tm * S_localtime_r(const time_t *clock, struct tm *result) {
+ dTHX; /* in case the following is defined as Perl_my_localtime(aTHX_ ...) */
const struct tm *static_result = localtime(clock);
assert(result != NULL);
return result;
}
}
+#endif
-
+#ifndef HAS_GMTIME_R
/* Simulate gmtime_r() to the best of our ability */
-struct tm * fake_gmtime_r(const time_t *clock, struct tm *result) {
+static struct tm * S_gmtime_r(const time_t *clock, struct tm *result) {
+ dTHX; /* in case the following is defined as Perl_my_gmtime(aTHX_ ...) */
const struct tm *static_result = gmtime(clock);
assert(result != NULL);
return result;
}
}
+#endif
-
-struct tm *gmtime64_r (const Time64_T *in_time, struct tm *p)
+static struct TM *S_gmtime64_r (const Time64_T *in_time, struct TM *p)
{
int v_tm_sec, v_tm_min, v_tm_hour, v_tm_mon, v_tm_wday;
- Int64 v_tm_tday;
+ Time64_T v_tm_tday;
int leap;
- Int64 m;
+ Time64_T m;
Time64_T time = *in_time;
Year year = 70;
+ int cycles = 0;
assert(p != NULL);
/* Use the system gmtime() if time_t is small enough */
if( SHOULD_USE_SYSTEM_GMTIME(*in_time) ) {
- time_t safe_time = *in_time;
- GMTIME_R(&safe_time, p);
- assert(_check_tm(p));
+ time_t safe_time = (time_t)*in_time;
+ struct tm safe_date;
+ GMTIME_R(&safe_time, &safe_date);
+
+ S_copy_little_tm_to_big_TM(&safe_date, p);
+ assert(S_check_tm(p));
+
return p;
}
p->tm_isdst = 0;
#ifdef HAS_TM_TM_ZONE
- p->tm_zone = "UTC";
+ p->tm_zone = (char *)"UTC";
#endif
- v_tm_sec = (int)(time % 60);
- time /= 60;
- v_tm_min = (int)(time % 60);
- time /= 60;
- v_tm_hour = (int)(time % 24);
- time /= 24;
+ v_tm_sec = (int)fmod(time, 60.0);
+ time = time >= 0 ? floor(time / 60.0) : ceil(time / 60.0);
+ v_tm_min = (int)fmod(time, 60.0);
+ time = time >= 0 ? floor(time / 60.0) : ceil(time / 60.0);
+ v_tm_hour = (int)fmod(time, 24.0);
+ time = time >= 0 ? floor(time / 24.0) : ceil(time / 24.0);
v_tm_tday = time;
WRAP (v_tm_sec, v_tm_min, 60);
WRAP (v_tm_min, v_tm_hour, 60);
WRAP (v_tm_hour, v_tm_tday, 24);
- v_tm_wday = (int)((v_tm_tday + 4) % 7);
+ v_tm_wday = (int)fmod((v_tm_tday + 4.0), 7.0);
if (v_tm_wday < 0)
v_tm_wday += 7;
m = v_tm_tday;
if (m >= 0) {
/* Gregorian cycles, this is huge optimization for distant times */
- while (m >= (Time64_T) days_in_gregorian_cycle) {
- m -= (Time64_T) days_in_gregorian_cycle;
- year += years_in_gregorian_cycle;
+ cycles = (int)floor(m / (Time64_T) days_in_gregorian_cycle);
+ if( cycles ) {
+ m -= (cycles * (Time64_T) days_in_gregorian_cycle);
+ year += (cycles * years_in_gregorian_cycle);
}
/* Years */
year--;
/* Gregorian cycles */
- while (m < (Time64_T) -days_in_gregorian_cycle) {
- m += (Time64_T) days_in_gregorian_cycle;
- year -= years_in_gregorian_cycle;
+ cycles = (int)ceil((m / (Time64_T) days_in_gregorian_cycle) + 1);
+ if( cycles ) {
+ m -= (cycles * (Time64_T) days_in_gregorian_cycle);
+ year += (cycles * years_in_gregorian_cycle);
}
/* Years */
return NULL;
}
+ /* At this point m is less than a year so casting to an int is safe */
p->tm_mday = (int) m + 1;
- p->tm_yday = (int) julian_days_by_month[leap][v_tm_mon] + m;
- p->tm_sec = v_tm_sec, p->tm_min = v_tm_min, p->tm_hour = v_tm_hour,
- p->tm_mon = v_tm_mon, p->tm_wday = v_tm_wday;
+ p->tm_yday = julian_days_by_month[leap][v_tm_mon] + (int)m;
+ p->tm_sec = v_tm_sec;
+ p->tm_min = v_tm_min;
+ p->tm_hour = v_tm_hour;
+ p->tm_mon = v_tm_mon;
+ p->tm_wday = v_tm_wday;
- assert(_check_tm(p));
+ assert(S_check_tm(p));
return p;
}
-struct tm *localtime64_r (const Time64_T *time, struct tm *local_tm)
+static struct TM *S_localtime64_r (const Time64_T *time, struct TM *local_tm)
{
time_t safe_time;
- struct tm gm_tm;
+ struct tm safe_date;
+ struct TM gm_tm;
Year orig_year;
int month_diff;
/* Use the system localtime() if time_t is small enough */
if( SHOULD_USE_SYSTEM_LOCALTIME(*time) ) {
- safe_time = *time;
- LOCALTIME_R(&safe_time, local_tm);
- assert(_check_tm(local_tm));
+ safe_time = (time_t)*time;
+
+ TIME64_TRACE1("Using system localtime for %lld\n", *time);
+
+ LOCALTIME_R(&safe_time, &safe_date);
+
+ S_copy_little_tm_to_big_TM(&safe_date, local_tm);
+ assert(S_check_tm(local_tm));
+
return local_tm;
}
- if( gmtime64_r(time, &gm_tm) == NULL )
+ if( S_gmtime64_r(time, &gm_tm) == NULL ) {
+ TIME64_TRACE1("gmtime64_r returned null for %lld\n", *time);
return NULL;
+ }
orig_year = gm_tm.tm_year;
if (gm_tm.tm_year > (2037 - 1900) ||
- gm_tm.tm_year < (1902 - 1900)
+ gm_tm.tm_year < (1970 - 1900)
)
{
- gm_tm.tm_year = _safe_year(gm_tm.tm_year + 1900) - 1900;
+ TIME64_TRACE1("Mapping tm_year %lld to safe_year\n", (Year)gm_tm.tm_year);
+ gm_tm.tm_year = S_safe_year((Year)(gm_tm.tm_year + 1900)) - 1900;
}
- safe_time = TIMEGM(&gm_tm);
- if( LOCALTIME_R(&safe_time, local_tm) == NULL )
+ safe_time = (time_t)S_timegm64(&gm_tm);
+ if( LOCALTIME_R(&safe_time, &safe_date) == NULL ) {
+ TIME64_TRACE1("localtime_r(%d) returned NULL\n", (int)safe_time);
return NULL;
+ }
+
+ S_copy_little_tm_to_big_TM(&safe_date, local_tm);
local_tm->tm_year = orig_year;
if( local_tm->tm_year != orig_year ) {
+ TIME64_TRACE2("tm_year overflow: tm_year %lld, orig_year %lld\n",
+ (Year)local_tm->tm_year, (Year)orig_year);
+
#ifdef EOVERFLOW
errno = EOVERFLOW;
#endif
/* GMT is Jan 1st, xx01 year, but localtime is still Dec 31st
in a non-leap xx00. There is one point in the cycle
we can't account for which the safe xx00 year is a leap
- year. So we need to correct for Dec 31st comming out as
+ year. So we need to correct for Dec 31st coming out as
the 366th day of the year.
*/
if( !IS_LEAP(local_tm->tm_year) && local_tm->tm_yday == 365 )
local_tm->tm_yday--;
- assert(_check_tm(local_tm));
+ assert(S_check_tm(local_tm));
return local_tm;
}
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