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().
+Perl_localtime64_r() is a 64-bit equivalent of localtime_r().
-gmtime64_r() is a 64-bit equivalent of gmtime_r().
+Perl_gmtime64_r() is a 64-bit equivalent of gmtime_r().
*/
+#include "EXTERN.h"
+#define PERL_IN_TIME64_C
+#include "perl.h"
#include "time64.h"
-static const int days_in_month[2][12] = {
+static const char days_in_month[2][12] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
};
-static const int julian_days_by_month[2][12] = {
+static const short julian_days_by_month[2][12] = {
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335},
};
-static const int length_of_year[2] = { 365, 366 };
+static const short length_of_year[2] = { 365, 366 };
/* Number of days in a 400 year Gregorian cycle */
static const Year years_in_gregorian_cycle = 400;
/* 28 year calendar cycle between 2010 and 2037 */
#define SOLAR_CYCLE_LENGTH 28
-static const int safe_years[SOLAR_CYCLE_LENGTH] = {
+static const short safe_years[SOLAR_CYCLE_LENGTH] = {
2016, 2017, 2018, 2019,
2020, 2021, 2022, 2023,
2024, 2025, 2026, 2027,
2012, 2013, 2014, 2015
};
-static const int dow_year_start[SOLAR_CYCLE_LENGTH] = {
- 5, 0, 1, 2, /* 0 2016 - 2019 */
- 3, 5, 6, 0, /* 4 */
- 1, 3, 4, 5, /* 8 */
- 6, 1, 2, 3, /* 12 */
- 4, 6, 0, 1, /* 16 */
- 2, 4, 5, 6, /* 20 2036, 2037, 2010, 2011 */
- 0, 2, 3, 4 /* 24 2012, 2013, 2014, 2015 */
-};
-
/* Let's assume people are going to be looking for dates in the future.
Let's provide some cheats so you can skip ahead.
This has a 4x speed boost when near 2008.
#define CHEAT_YEARS 108
#define IS_LEAP(n) ((!(((n) + 1900) % 400) || (!(((n) + 1900) % 4) && (((n) + 1900) % 100))) != 0)
+#undef WRAP /* some <termios.h> define this */
#define WRAP(a,b,m) ((a) = ((a) < 0 ) ? ((b)--, (a) + (m)) : (a))
#ifdef USE_SYSTEM_LOCALTIME
# 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
-static int is_exception_century(Year year)
+/* Set up the mutexes for this file. There are no races possible on
+ * non-threaded perls, nor platforms that naturally don't have them.
+ * Otherwise, we need to have mutexes. If we have reentrant versions of the
+ * functions below, they automatically will be substituted for the
+ * non-reentrant ones. That solves the problem of the buffers being trashed by
+ * another thread, but not of the environment or locale changing during their
+ * execution. To do that, we only need a read lock (which prevents writing by
+ * others). However, if we don't have re-entrant functions, we can gain some
+ * measure of thread-safety by using an exclusive lock during their execution.
+ * That will protect against any other use of the functions that use the
+ * mutexes, which all of core should be using. */
+#ifdef USE_REENTRANT_API /* This indicates a platform where we need reentrant
+ versions if have them */
+# ifdef PERL_REENTR_USING_LOCALTIME_R
+# define LOCALTIME_LOCK ENV_LOCALE_READ_LOCK
+# define LOCALTIME_UNLOCK ENV_LOCALE_READ_UNLOCK
+# else
+# define LOCALTIME_LOCK ENV_LOCALE_LOCK
+# define LOCALTIME_UNLOCK ENV_LOCALE_UNLOCK
+# endif
+# ifdef PERL_REENTR_USING_GMTIME_R
+# define GMTIME_LOCK ENV_LOCALE_READ_LOCK
+# define GMTIME_UNLOCK ENV_LOCALE_READ_UNLOCK
+# else
+# define GMTIME_LOCK ENV_LOCALE_LOCK
+# define GMTIME_UNLOCK ENV_LOCALE_UNLOCK
+# endif
+#else /* Reentrant not needed, so races not possible */
+# define LOCALTIME_LOCK NOOP
+# define LOCALTIME_UNLOCK NOOP
+# define GMTIME_LOCK NOOP
+# define GMTIME_UNLOCK NOOP
+#endif
+
+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"); */
+ const int is_exception = ((year % 100 == 0) && !(year % 400 == 0));
+ TIME64_TRACE1("# is_exception_century: %s\n", is_exception ? "yes" : "no");
return(is_exception);
}
-Time64_T timegm64(struct TM *date) {
+static Time64_T S_timegm64(const struct TM *date) {
int days = 0;
Time64_T seconds = 0;
- Year year;
if( date->tm_year > 70 ) {
- year = 70;
+ Year year = 70;
while( year < date->tm_year ) {
days += length_of_year[IS_LEAP(year)];
year++;
}
}
else if ( date->tm_year < 70 ) {
- year = 69;
+ Year year = 69;
do {
days -= length_of_year[IS_LEAP(year)];
year--;
}
-static int check_tm(struct TM *tm)
+#ifdef DEBUGGING
+static int S_check_tm(const 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
*/
-static 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.
*/
-static 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;
}
-void copy_tm_to_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
- }
-}
-
-
-void copy_TM_to_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 = (int)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
- }
-}
-
+static void S_copy_little_tm_to_big_TM(const struct tm *src, struct TM *dest) {
+ assert(src);
+ assert(dest);
+#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
-/* Simulate localtime_r() to the best of our ability */
-struct tm * fake_localtime_r(const time_t *clock, struct tm *result) {
- const struct tm *static_result = localtime(clock);
-
- assert(result != NULL);
-
- if( static_result == NULL ) {
- memset(result, 0, sizeof(*result));
- return NULL;
- }
- else {
- memcpy(result, static_result, sizeof(*result));
- return result;
- }
-}
-
-
-/* Simulate gmtime_r() to the best of our ability */
-struct tm * fake_gmtime_r(const time_t *clock, struct tm *result) {
- const struct tm *static_result = gmtime(clock);
-
- assert(result != NULL);
-
- if( static_result == NULL ) {
- memset(result, 0, sizeof(*result));
- return NULL;
- }
- else {
- memcpy(result, static_result, sizeof(*result));
- return result;
- }
+#else
+ /* They're the same type */
+ memcpy(dest, src, sizeof(*dest));
+#endif
}
-
-struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
+struct TM *Perl_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;
Time64_T v_tm_tday;
Time64_T m;
Time64_T time = *in_time;
Year year = 70;
- int cycles = 0;
+ dTHX;
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;
+ time_t safe_time = (time_t)*in_time;
struct tm safe_date;
- GMTIME_R(&safe_time, &safe_date);
+ struct tm * result;
+
+ GMTIME_LOCK;
+
+ /* reentr.h will automatically replace this with a call to gmtime_r()
+ * when appropriate */
+ result = gmtime(&safe_time);
- copy_tm_to_TM(&safe_date, p);
- assert(check_tm(p));
+ assert(result != NULL);
+
+#if defined(HAS_GMTIME_R) && defined(USE_REENTRANT_API)
+
+ PERL_UNUSED_VAR(safe_date);
+#else
+ /* Here, no gmtime_r() and is a threaded perl where the result can be
+ * overwritten by a call in another thread. Copy to a safe place,
+ * hopefully before another gmtime that isn't using the mutexes can
+ * jump in and trash this result. */
+ memcpy(&safe_date, result, sizeof(safe_date));
+ result = &safe_date;
+#endif
+ GMTIME_UNLOCK;
+
+ S_copy_little_tm_to_big_TM(result, p);
+ assert(S_check_tm(p));
return p;
}
p->tm_zone = "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)Perl_fmod(time, 60.0);
+ time = time >= 0 ? Perl_floor(time / 60.0) : Perl_ceil(time / 60.0);
+ v_tm_min = (int)Perl_fmod(time, 60.0);
+ time = time >= 0 ? Perl_floor(time / 60.0) : Perl_ceil(time / 60.0);
+ v_tm_hour = (int)Perl_fmod(time, 24.0);
+ time = time >= 0 ? Perl_floor(time / 24.0) : Perl_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)Perl_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 */
- cycles = m / (Time64_T) days_in_gregorian_cycle;
+ const int cycles = (int)Perl_floor(m / (Time64_T) days_in_gregorian_cycle);
if( cycles ) {
m -= (cycles * (Time64_T) days_in_gregorian_cycle);
year += (cycles * years_in_gregorian_cycle);
v_tm_mon++;
}
} else {
+ int cycles;
+
year--;
/* Gregorian cycles */
- cycles = (m / (Time64_T) days_in_gregorian_cycle) + 1;
+ cycles = (int)Perl_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);
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)
+struct TM *Perl_localtime64_r (const Time64_T *time, struct TM *local_tm)
{
time_t safe_time;
struct tm safe_date;
+ const struct tm * result;
struct TM gm_tm;
Year orig_year;
int month_diff;
+ const bool use_system = SHOULD_USE_SYSTEM_LOCALTIME(*time);
+ dTHX;
assert(local_tm != NULL);
/* Use the system localtime() if time_t is small enough */
- if( SHOULD_USE_SYSTEM_LOCALTIME(*time) ) {
- safe_time = *time;
+ if (use_system) {
+ safe_time = (time_t)*time;
- LOCALTIME_R(&safe_time, &safe_date);
+ TIME64_TRACE1("Using system localtime for %lld\n", *time);
+ }
+ else {
+ if (Perl_gmtime64_r(time, &gm_tm) == NULL) {
+ TIME64_TRACE1("gmtime64_r returned null for %lld\n", *time);
+ return NULL;
+ }
- copy_tm_to_TM(&safe_date, local_tm);
- assert(check_tm(local_tm));
+ orig_year = gm_tm.tm_year;
+
+ if (gm_tm.tm_year > (2037 - 1900) ||
+ gm_tm.tm_year < (1970 - 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;
+ }
- return local_tm;
+ safe_time = (time_t)S_timegm64(&gm_tm);
}
- if( gmtime64_r(time, &gm_tm) == NULL )
- return NULL;
+ LOCALTIME_LOCK;
- orig_year = gm_tm.tm_year;
+ /* reentr.h will automatically replace this with a call to localtime_r()
+ * when appropriate */
+ result = localtime(&safe_time);
- if (gm_tm.tm_year > (2037 - 1900) ||
- gm_tm.tm_year < (1902 - 1900)
- )
- {
- gm_tm.tm_year = safe_year((Year)(gm_tm.tm_year + 1900)) - 1900;
+ if(UNLIKELY(result == NULL)) {
+ LOCALTIME_UNLOCK;
+ TIME64_TRACE1("localtime(%d) returned NULL\n", (int)safe_time);
+ return NULL;
}
- safe_time = timegm64(&gm_tm);
- if( LOCALTIME_R(&safe_time, &safe_date) == NULL )
- return NULL;
+#if ! defined(USE_REENTRANT_API) || defined(PERL_REENTR_USING_LOCALTIME_R)
- copy_tm_to_TM(&safe_date, local_tm);
+ PERL_UNUSED_VAR(safe_date);
+
+#else
+
+ /* Here, would be using localtime_r() if it could, meaning there isn't one,
+ * and is a threaded perl where the result can be overwritten by a call in
+ * another thread. Copy to a safe place, hopefully before another
+ * localtime that isn't using the mutexes can jump in and trash this
+ * result. */
+ memcpy(&safe_date, result, sizeof(safe_date));
+ result = &safe_date;
+
+#endif
+
+ LOCALTIME_UNLOCK;
+
+ S_copy_little_tm_to_big_TM(result, local_tm);
+
+ if (! use_system) {
+
+ 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);
- local_tm->tm_year = orig_year;
- if( local_tm->tm_year != orig_year ) {
#ifdef EOVERFLOW
- errno = EOVERFLOW;
+ errno = EOVERFLOW;
#endif
- return NULL;
- }
+ return NULL;
+ }
+
+ month_diff = local_tm->tm_mon - gm_tm.tm_mon;
+ /* When localtime is Dec 31st previous year and
+ gmtime is Jan 1st next year.
+ */
+ if( month_diff == 11 ) {
+ local_tm->tm_year--;
+ }
- month_diff = local_tm->tm_mon - gm_tm.tm_mon;
+ /* When localtime is Jan 1st, next year and
+ gmtime is Dec 31st, previous year.
+ */
+ if( month_diff == -11 ) {
+ local_tm->tm_year++;
+ }
- /* When localtime is Dec 31st previous year and
- gmtime is Jan 1st next year.
- */
- if( month_diff == 11 ) {
- local_tm->tm_year--;
- }
+ /* 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 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--;
- /* When localtime is Jan 1st, next year and
- gmtime is Dec 31st, previous year.
- */
- if( month_diff == -11 ) {
- local_tm->tm_year++;
}
- /* 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
- 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;
}
https://perl5.git.perl.org / perl5.git / blobdiff