From: "Albert ARIBAUD (3ADEV)" <albert.aribaud@3adev.fr>
To: libc-alpha@sourceware.org
Cc: "Albert ARIBAUD (3ADEV)" <albert.aribaud@3adev.fr>
Subject: [RFC PATCH 03/52] Y2038: add functions using struct tm
Date: Thu, 07 Sep 2017 22:42:00 -0000 [thread overview]
Message-ID: <20170907224219.12483-4-albert.aribaud@3adev.fr> (raw)
In-Reply-To: <20170907224219.12483-3-albert.aribaud@3adev.fr>
This consists in the following implementation additions:
([file] 32-bit implementation -> [file] 64-bit addition)
time/ctime.c ctime() -> __ctime64()
time/ctime_r.c ctime_r() -> __ctime64_r()
time/gmtime.c gmtime() -> __gmtime64()
time/gmtime.c gmtime_r() -> __gmtime64_r()
time/localtime.c localtime() -> __localtime64()
time/localtime.c localtime_r() -> __localtime64_r()
which require the following internal function additions
time/offtime.c __offtime() -> __offtime64()
time/tzset.c __tz_convert() -> __tz64_convert()
and internal function (32-bit-time-compatible) changes
time/tzfile.c __tzfile_compute()
time/tzset.c tzset_internal()
time/tzset.c compute_change()
Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
---
include/time.h | 26 ++++++++++++---
sysdeps/unix/sysv/linux/arm/Versions | 3 ++
time/ctime.c | 10 ++++++
time/ctime_r.c | 9 +++++
time/gmtime.c | 15 +++++++++
time/localtime.c | 17 ++++++++++
time/offtime.c | 64 ++++++++++++++++++++++++++++++++++++
time/tzfile.c | 4 +--
time/tzset.c | 64 +++++++++++++++++++++++++++++++++---
9 files changed, 201 insertions(+), 11 deletions(-)
diff --git a/include/time.h b/include/time.h
index 9956b82eb8..d2b1080fd6 100644
--- a/include/time.h
+++ b/include/time.h
@@ -8,6 +8,8 @@ extern __typeof (strftime_l) __strftime_l;
libc_hidden_proto (__strftime_l)
extern __typeof (strptime_l) __strptime_l;
+extern struct tm *__localtime64 (const __time64_t *__timer);
+
libc_hidden_proto (time)
libc_hidden_proto (asctime)
libc_hidden_proto (mktime)
@@ -39,13 +41,13 @@ extern int __use_tzfile attribute_hidden;
extern void __tzfile_read (const char *file, size_t extra,
char **extrap);
-extern void __tzfile_compute (time_t timer, int use_localtime,
+extern void __tzfile_compute (__time64_t timer, int use_localtime,
long int *leap_correct, int *leap_hit,
struct tm *tp);
extern void __tzfile_default (const char *std, const char *dst,
long int stdoff, long int dstoff);
extern void __tzset_parse_tz (const char *tz);
-extern void __tz_compute (time_t timer, struct tm *tm, int use_localtime)
+extern void __tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
__THROW internal_function;
/* Subroutine of `mktime'. Return the `time_t' representation of TP and
@@ -58,23 +60,37 @@ extern time_t __mktime_internal (struct tm *__tp,
extern struct tm *__localtime_r (const time_t *__timer,
struct tm *__tp) attribute_hidden;
-extern struct tm *__gmtime_r (const time_t *__restrict __timer,
+extern struct tm *__localtime64_r (const __time64_t *__timer,
+ struct tm *__tp) attribute_hidden;
+
+extern struct tm *__gmtime_r (const __time_t *__restrict __timer,
struct tm *__restrict __tp);
libc_hidden_proto (__gmtime_r)
+extern struct tm *__gmtime64_r (const __time64_t *__restrict __timer,
+ struct tm *__restrict __tp);
+
/* Compute the `struct tm' representation of *T,
offset OFFSET seconds east of UTC,
and store year, yday, mon, mday, wday, hour, min, sec into *TP.
Return nonzero if successful. */
-extern int __offtime (const time_t *__timer,
+extern int __offtime (const __time_t *__timer,
long int __offset,
struct tm *__tp);
+extern int __offtime64 (const __time64_t *__timer,
+ long int __offset,
+ struct tm *__tp);
+
extern char *__asctime_r (const struct tm *__tp, char *__buf);
extern void __tzset (void);
/* Prototype for the internal function to get information based on TZ. */
-extern struct tm *__tz_convert (const time_t *timer, int use_localtime, struct tm *tp);
+extern struct tm *__tz_convert (const __time_t *timer, int use_localtime,
+ struct tm *tp);
+
+extern struct tm *__tz_convert64 (const __time64_t *timer,
+ int use_localtime, struct tm *tp);
extern int __nanosleep (const struct timespec *__requested_time,
struct timespec *__remaining);
diff --git a/sysdeps/unix/sysv/linux/arm/Versions b/sysdeps/unix/sysv/linux/arm/Versions
index d3655768c8..dd6a160c75 100644
--- a/sysdeps/unix/sysv/linux/arm/Versions
+++ b/sysdeps/unix/sysv/linux/arm/Versions
@@ -22,5 +22,8 @@ libc {
GLIBC_Y2038 {
__difftime64;
+ __ctime64; __ctime64_r;
+ __gmtime64; __gmtime64_r;
+ __localtime64; __localtime64_r;
}
}
diff --git a/time/ctime.c b/time/ctime.c
index 7baca1bb57..a5150c1845 100644
--- a/time/ctime.c
+++ b/time/ctime.c
@@ -26,3 +26,13 @@ ctime (const time_t *t)
In particular, ctime and asctime must yield the same pointer. */
return asctime (localtime (t));
}
+
+/* Return a string as returned by asctime which
+ is the representation of *T in that form. */
+char *
+__ctime64 (const __time64_t *t)
+{
+ /* Apply the same rule as ctime:
+ make ctime64 (t) is equivalent to asctime (localtime64 (t)). */
+ return asctime (__localtime64 (t));
+}
diff --git a/time/ctime_r.c b/time/ctime_r.c
index ecd7731038..74d856f17e 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -27,3 +27,12 @@ ctime_r (const time_t *t, char *buf)
struct tm tm;
return __asctime_r (__localtime_r (t, &tm), buf);
}
+
+/* Return a string as returned by asctime which is the representation
+ of *T in that form. Reentrant Y2038-proof version. */
+char *
+__ctime64_r (const __time64_t *t, char *buf)
+{
+ struct tm tm;
+ return __asctime_r (__localtime64_r (t, &tm), buf);
+}
diff --git a/time/gmtime.c b/time/gmtime.c
index 049d551cdf..7662c1d1f7 100644
--- a/time/gmtime.c
+++ b/time/gmtime.c
@@ -35,3 +35,18 @@ gmtime (const time_t *t)
{
return __tz_convert (t, 0, &_tmbuf);
}
+
+/* Return the `struct tm' representation of 64-bit-time *T
+ in UTC, using *TP to store the result. */
+struct tm *
+__gmtime64_r (const __time64_t *t, struct tm *tp)
+{
+ return __tz_convert64 (t, 0, tp);
+}
+
+/* Return the `struct tm' representation of 64-bit-time *T in UTC. */
+struct tm *
+__gmtime64 (const __time64_t *t)
+{
+ return __tz_convert64 (t, 0, &_tmbuf);
+}
diff --git a/time/localtime.c b/time/localtime.c
index 07dd67ca71..fd2d997e60 100644
--- a/time/localtime.c
+++ b/time/localtime.c
@@ -39,3 +39,20 @@ localtime (const time_t *t)
return __tz_convert (t, 1, &_tmbuf);
}
libc_hidden_def (localtime)
+
+/* 64-bit-time versions */
+
+/* Return the `struct tm' representation of *T in local time,
+ using *TP to store the result. */
+struct tm *
+__localtime64_r (const __time64_t *t, struct tm *tp)
+{
+ return __tz_convert64 (t, 1, tp);
+}
+
+/* Return the `struct tm' representation of *T in local time. */
+struct tm *
+__localtime64 (const __time64_t *t)
+{
+ return __tz_convert64 (t, 1, &_tmbuf);
+}
diff --git a/time/offtime.c b/time/offtime.c
index 75a28fed84..84237db440 100644
--- a/time/offtime.c
+++ b/time/offtime.c
@@ -84,3 +84,67 @@ __offtime (const time_t *t, long int offset, struct tm *tp)
tp->tm_mday = days + 1;
return 1;
}
+
+/* Compute the `struct tm' representation of 64-bit-time *T,
+ offset OFFSET seconds east of UTC,
+ and store year, yday, mon, mday, wday, hour, min, sec into *TP.
+ Return nonzero if successful. */
+int
+__offtime64 (const __time64_t *t, long int offset, struct tm *tp)
+{
+ __time64_t days, rem, y;
+ const unsigned short int *ip;
+
+ days = *t / SECS_PER_DAY;
+ rem = *t % SECS_PER_DAY;
+ rem += offset;
+ while (rem < 0)
+ {
+ rem += SECS_PER_DAY;
+ --days;
+ }
+ while (rem >= SECS_PER_DAY)
+ {
+ rem -= SECS_PER_DAY;
+ ++days;
+ }
+ tp->tm_hour = rem / SECS_PER_HOUR;
+ rem %= SECS_PER_HOUR;
+ tp->tm_min = rem / 60;
+ tp->tm_sec = rem % 60;
+ /* January 1, 1970 was a Thursday. */
+ tp->tm_wday = (4 + days) % 7;
+ if (tp->tm_wday < 0)
+ tp->tm_wday += 7;
+ y = 1970;
+
+#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
+#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
+
+ while (days < 0 || days >= (__isleap (y) ? 366 : 365))
+ {
+ /* Guess a corrected year, assuming 365 days per year. */
+ __time64_t yg = y + days / 365 - (days % 365 < 0);
+
+ /* Adjust DAYS and Y to match the guessed year. */
+ days -= ((yg - y) * 365
+ + LEAPS_THRU_END_OF (yg - 1)
+ - LEAPS_THRU_END_OF (y - 1));
+ y = yg;
+ }
+ tp->tm_year = y - 1900;
+ if (tp->tm_year != y - 1900)
+ {
+ /* The year cannot be represented due to overflow. */
+ __set_errno (EOVERFLOW);
+ return 0;
+ }
+ tp->tm_yday = days;
+ ip = __mon_yday[__isleap(y)];
+ for (y = 11; days < (long int) ip[y]; --y)
+ continue;
+ days -= ip[y];
+ tp->tm_mon = y;
+ tp->tm_mday = days + 1;
+ return 1;
+}
diff --git a/time/tzfile.c b/time/tzfile.c
index d41246980b..9da9d0b38b 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -630,7 +630,7 @@ __tzfile_default (const char *std, const char *dst,
}
\f
void
-__tzfile_compute (time_t timer, int use_localtime,
+__tzfile_compute (__time64_t timer, int use_localtime,
long int *leap_correct, int *leap_hit,
struct tm *tp)
{
@@ -685,7 +685,7 @@ __tzfile_compute (time_t timer, int use_localtime,
/* Convert to broken down structure. If this fails do not
use the string. */
- if (__glibc_unlikely (! __offtime (&timer, 0, tp)))
+ if (__glibc_unlikely (! __offtime64 (&timer, 0, tp)))
goto use_last;
/* Use the rules from the TZ string to compute the change. */
diff --git a/time/tzset.c b/time/tzset.c
index cf5fe969b6..ee462107e1 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -55,7 +55,7 @@ typedef struct
/* We cache the computed time of change for a
given year so we don't have to recompute it. */
- time_t change; /* When to change to this zone. */
+ __time64_t change; /* When to change to this zone. */
int computed_for; /* Year above is computed for. */
} tz_rule;
@@ -417,7 +417,7 @@ tzset_internal (int always)
tz_rules[0].name = tz_rules[1].name = "UTC";
if (J0 != 0)
tz_rules[0].type = tz_rules[1].type = J0;
- tz_rules[0].change = tz_rules[1].change = (time_t) -1;
+ tz_rules[0].change = tz_rules[1].change = (__time64_t) -1;
update_vars ();
return;
}
@@ -516,10 +516,11 @@ compute_change (tz_rule *rule, int year)
/* Figure out the correct timezone for TM and set `__tzname',
- `__timezone', and `__daylight' accordingly. */
+ `__timezone', and `__daylight' accordingly.
+ NOTE: this takes a __time64_t value, so passing a __time_t value is OK. */
void
internal_function
-__tz_compute (time_t timer, struct tm *tm, int use_localtime)
+__tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
{
compute_change (&tz_rules[0], 1900 + tm->tm_year);
compute_change (&tz_rules[1], 1900 + tm->tm_year);
@@ -620,6 +621,61 @@ __tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
}
+/* Return the `struct tm' representation of *TIMER in the local timezone.
+ Use local time if USE_LOCALTIME is nonzero, UTC otherwise. */
+struct tm *
+__tz_convert64 (const __time64_t *timer, int use_localtime, struct tm *tp)
+{
+ long int leap_correction;
+ int leap_extra_secs;
+
+ if (timer == NULL)
+ {
+ __set_errno (EINVAL);
+ return NULL;
+ }
+
+ __libc_lock_lock (tzset_lock);
+
+ /* Update internal database according to current TZ setting.
+ POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname.
+ This is a good idea since this allows at least a bit more parallelism. */
+ tzset_internal (tp == &_tmbuf && use_localtime);
+
+ if (__use_tzfile)
+ __tzfile_compute (*timer, use_localtime, &leap_correction,
+ &leap_extra_secs, tp);
+ else
+ {
+ if (! __offtime64 (timer, 0, tp))
+ tp = NULL;
+ else
+ __tz_compute (*timer, tp, use_localtime);
+ leap_correction = 0L;
+ leap_extra_secs = 0;
+ }
+
+ __libc_lock_unlock (tzset_lock);
+
+ if (tp)
+ {
+ if (! use_localtime)
+ {
+ tp->tm_isdst = 0;
+ tp->tm_zone = "GMT";
+ tp->tm_gmtoff = 0L;
+ }
+
+ if (__offtime64 (timer, tp->tm_gmtoff - leap_correction, tp))
+ tp->tm_sec += leap_extra_secs;
+ else
+ tp = NULL;
+ }
+
+ return tp;
+}
+
+
libc_freeres_fn (free_mem)
{
while (tzstring_list != NULL)
--
2.11.0
next prev parent reply other threads:[~2017-09-07 22:42 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 22:42 [RFC PATCH 00/52] Make GLIBC Y2038-proof Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` [RFC PATCH 01/52] Y2038: add type __time64_t Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` [RFC PATCH 02/52] Y2038: add function __difftime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` Albert ARIBAUD (3ADEV) [this message]
2017-09-07 22:42 ` [RFC PATCH 04/52] Y2038: add function __mktime64 (and timelocal) Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` [RFC PATCH 05/52] Y2038: add function __timegm64 Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` [RFC PATCH 06/52] Y2038: add struct __timespec64 Albert ARIBAUD (3ADEV)
2017-09-07 22:42 ` [RFC PATCH 07/52] Y2038: add function __clock_gettime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 08/52] Y2038: add function __clock_settime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 09/52] Y2038: add function __clock_getres64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 10/52] Y2038: add function __clock_nanosleep64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 11/52] Y2038: add function __timespec_get64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 12/52] Y2038: add function __futimens64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 13/52] Y2038: add function __utimensat64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 14/52] Y2038: add function __sigtimedwait64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 15/52] Y2038: add struct __timeval64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 16/52] Y2038: add function __futimes64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 17/52] Y2038: add function __lutimes64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 18/52] Y2038: add struct __itimerspec64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 19/52] Y2038: add function __timer_gettime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 20/52] Y2038: add function __timer_settime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:43 ` [RFC PATCH 21/52] Y2038: add function __timerfd_gettime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 22/52] Y2038: add function __timerfd_settime64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 23/52] Y2038: add struct __stat64_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 24/52] Y2038: add function __fstat64_t64 (and __fxstat64_t64) Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 25/52] Y2038: add function __stat64_t64 (and __xstat64_t64) Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 26/52] Y2038: add function __lstat64_t64 (and __lxstat64_t64) Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 27/52] Y2038: add function __fstatat64_t64 (and __fxstatat_t64) Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 28/52] Y2038: add function __time_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 29/52] Y2038: add function __stime_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 30/52] Y2038: add function __utimes_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 31/52] Y2038: add function __gettimeofday_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 32/52] Y2038: add function __settimeofday_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 33/52] Y2038: add function __mq_timedsend_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 34/52] Y2038: add function __mq_timedreceive_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:44 ` [RFC PATCH 35/52] Y2038: add function __msgctl_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 36/52] Y2038: add function __sched_rr_get_interval_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 37/52] Y2038: add function __nanosleep64_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 38/52] Y2038: add function __adjtime_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 39/52] Y2038: add function __utime_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 40/52] Y2038: add struct __itimerval_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 41/52] Y2038: add function __getitimer_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 42/52] Y2038: add function __setitimer_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 43/52] Y2038: add functions using futexes Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 44/52] Y2038: add function __getrusage_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 45/52] Y2038: add struct __ntp_timeval_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 46/52] Y2038: add function __ntp_gettime_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 47/52] Y2038: add function __ntp_gettimex_t64 Albert ARIBAUD (3ADEV)
2017-09-07 22:45 ` [RFC PATCH 48/52] Y2038: add function __adjtimex_t64 (and __ntp_adjtime_t64) Albert ARIBAUD (3ADEV)
2017-09-07 22:46 ` [RFC PATCH 49/52] Y2038: add function pselect Albert ARIBAUD (3ADEV)
2017-09-08 17:49 ` [RFC PATCH 50/52] Y2038: add function select Albert ARIBAUD (3ADEV)
2017-09-08 17:49 ` [RFC PATCH 51/52] Y2038: add RPC functions Albert ARIBAUD (3ADEV)
2017-09-08 17:49 ` [RFC PATCH 52/52] Y2038: add _TIME_BITS==64 support Albert ARIBAUD (3ADEV)
2017-09-08 19:47 ` Joseph Myers
2017-09-08 19:47 ` [RFC PATCH 51/52] Y2038: add RPC functions Joseph Myers
2017-09-08 19:59 ` Paul Eggert
2017-09-09 14:37 ` Albert ARIBAUD
2017-09-11 6:33 ` Paul Eggert
2017-09-11 7:06 ` Paul Eggert
2017-09-11 14:07 ` Paul Eggert
2017-09-11 15:59 ` Albert ARIBAUD
2017-09-07 23:21 ` [RFC PATCH 00/52] Make GLIBC Y2038-proof Joseph Myers
2017-09-08 16:19 ` Zack Weinberg
2017-09-08 16:43 ` Joseph Myers
2017-09-08 16:54 ` Paul Eggert
2017-09-08 17:01 ` Zack Weinberg
2017-09-08 17:24 ` Joseph Myers
2017-09-08 18:32 ` Zack Weinberg
2017-09-08 17:42 ` Albert ARIBAUD
2017-09-08 17:59 ` Joseph Myers
2017-09-08 18:16 ` Albert ARIBAUD
2017-09-08 18:36 ` Zack Weinberg
2017-09-08 17:08 ` Albert ARIBAUD
2017-09-08 17:26 ` Joseph Myers
2017-09-08 19:19 ` Albert ARIBAUD
2017-09-08 4:23 ` Albert ARIBAUD
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