#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 TRACE(format) (fprintf(stderr, format))
+# define TRACE1(format, var1) (fprintf(stderr, format, var1))
+# define TRACE2(format, var1, var2) (fprintf(stderr, format, var1, var2))
+# define TRACE3(format, var1, var2, var3) (fprintf(stderr, format, var1, var2, var3))
+#else
+# define TRACE(format) ((void)0)
+# define TRACE1(format, var1) ((void)0)
+# define TRACE2(format, var1, var2) ((void)0)
+# define TRACE3(format, var1, var2, var3) ((void)0)
+#endif
-static int is_exception_century(Int64 year)
+static int is_exception_century(Year year)
{
int is_exception = ((year % 100 == 0) && !(year % 400 == 0));
- /* printf("is_exception_century: %s\n", is_exception ? "yes" : "no"); */
+ TRACE1("# is_exception_century: %s\n", is_exception ? "yes" : "no");
return(is_exception);
}
Time64_T timegm64(struct TM *date) {
- int days = 0;
- Int64 seconds = 0;
- Int64 year;
+ 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);
}
+#ifdef DEBUGGING
static int check_tm(struct TM *tm)
{
/* Don't forget leap seconds */
return 1;
}
+#endif
/* The exceptional centuries without leap years cause the cycle to
exceptions = year_diff / 100;
exceptions -= year_diff / 400;
- /*
- fprintf(stderr, "# year: %lld, exceptions: %lld, year_diff: %lld\n",
- year, exceptions, year_diff);
- */
+ TRACE3("# year: %lld, exceptions: %lld, year_diff: %lld\n",
+ year, exceptions, year_diff);
return exceptions * 16;
}
assert(safe_year <= 2037 && safe_year >= 2010);
- /*
- printf("year: %d, year_cycle: %d, safe_year: %d\n",
- year, year_cycle, safe_year);
- */
+ 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) {
+void copy_little_tm_to_big_TM(const struct tm *src, struct TM *dest) {
if( src == NULL ) {
memset(dest, 0, sizeof(*dest));
}
}
-void copy_TM_to_tm(const struct TM *src, struct tm *dest) {
+void copy_big_TM_to_little_tm(const struct TM *src, struct tm *dest) {
if( src == NULL ) {
memset(dest, 0, sizeof(*dest));
}
/* Simulate localtime_r() to the best of our ability */
struct tm * fake_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);
/* Simulate gmtime_r() to the best of our ability */
struct tm * fake_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);
struct TM *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;
/* 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);
- copy_tm_to_TM(&safe_date, p);
+ copy_little_tm_to_big_TM(&safe_date, p);
assert(check_tm(p));
return p;
if (m >= 0) {
/* Gregorian cycles, this is huge optimization for distant times */
- cycles = floor(m / (Time64_T) days_in_gregorian_cycle);
+ cycles = (int)(m / (Time64_T) days_in_gregorian_cycle);
if( cycles ) {
m -= (cycles * (Time64_T) days_in_gregorian_cycle);
year += (cycles * years_in_gregorian_cycle);
year--;
/* Gregorian cycles */
- cycles = ceil(m / (Time64_T) days_in_gregorian_cycle) + 1;
+ cycles = (int)((m / (Time64_T) days_in_gregorian_cycle) + 1);
if( cycles ) {
m -= (cycles * (Time64_T) days_in_gregorian_cycle);
year += (cycles * years_in_gregorian_cycle);
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));
/* Use the system localtime() if time_t is small enough */
if( SHOULD_USE_SYSTEM_LOCALTIME(*time) ) {
- safe_time = *time;
+ safe_time = (time_t)*time;
+
+ TRACE1("Using system localtime for %lld\n", *time);
LOCALTIME_R(&safe_time, &safe_date);
- copy_tm_to_TM(&safe_date, local_tm);
+ copy_little_tm_to_big_TM(&safe_date, local_tm);
assert(check_tm(local_tm));
return local_tm;
}
- if( gmtime64_r(time, &gm_tm) == NULL )
+ if( gmtime64_r(time, &gm_tm) == NULL ) {
+ 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;
+ TRACE1("Mapping tm_year %lld to safe_year\n", (Year)gm_tm.tm_year);
+ gm_tm.tm_year = safe_year((Year)(gm_tm.tm_year + 1900)) - 1900;
}
- safe_time = timegm64(&gm_tm);
- if( LOCALTIME_R(&safe_time, &safe_date) == NULL )
+ safe_time = (time_t)timegm64(&gm_tm);
+ if( LOCALTIME_R(&safe_time, &safe_date) == NULL ) {
+ TRACE1("localtime_r(%d) returned NULL\n", (int)safe_time);
return NULL;
+ }
- copy_tm_to_TM(&safe_date, local_tm);
+ copy_little_tm_to_big_TM(&safe_date, local_tm);
local_tm->tm_year = orig_year;
if( local_tm->tm_year != orig_year ) {
+ TRACE2("tm_year overflow: tm_year %lld, orig_year %lld\n",
+ (Year)local_tm->tm_year, (Year)orig_year);
+
#ifdef EOVERFLOW
errno = EOVERFLOW;
#endif