-/* Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2002,2003,2004,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
#include <ctype.h>
#include <errno.h>
weak_alias (__timezone, timezone)
/* This locks all the state variables in tzfile.c and this file. */
-__libc_lock_define (static, tzset_lock)
+__libc_lock_define_initialized (static, tzset_lock)
#define min(a, b) ((a) < (b) ? (a) : (b))
static tz_rule tz_rules[2];
-static int compute_change __P ((tz_rule *rule, int year)) internal_function;
-static int tz_compute __P ((const struct tm *tm))
- internal_function;
-static void tzset_internal __P ((int always)) internal_function;
+static void compute_change (tz_rule *rule, int year) __THROW internal_function;
+static void tzset_internal (int always, int explicit)
+ __THROW internal_function;
\f
/* List of buffers containing time zone strings. */
struct tzstring_l
char data[0];
};
-struct tzstring_l *tzstring_list;
+static struct tzstring_l *tzstring_list;
/* Allocate a permanent home for S. It will never be moved or deallocated,
but may share space with other strings.
{
char *p;
struct tzstring_l *t, *u, *new;
- size_t len = strlen(s);
+ size_t len = strlen (s);
/* Walk the list and look for a match. If this string is the same
as the end of an already-allocated string, it can share space. */
return new->data;
}
\f
-static char *old_tz = NULL;
+/* Maximum length of a timezone name. tzset_internal keeps this up to date
+ (never decreasing it) when ! __use_tzfile.
+ tzfile.c keeps it up to date when __use_tzfile. */
+size_t __tzname_cur_max;
-/* Interpret the TZ envariable. */
-static void
-internal_function
-tzset_internal (always)
- int always;
+long int
+__tzname_max ()
{
- static int is_initialized = 0;
- register const char *tz;
- register size_t l;
- char *tzbuf;
- unsigned short int hh, mm, ss;
- unsigned short int whichrule;
-
- if (is_initialized && !always)
- return;
- is_initialized = 1;
-
- /* Examine the TZ environment variable. */
- tz = getenv ("TZ");
- if (tz == NULL)
- /* No user specification; use the site-wide default. */
- tz = TZDEFAULT;
- else if (*tz == '\0')
- /* User specified the empty string; use UTC explicitly. */
- tz = "Universal";
-
- /* A leading colon means "implementation defined syntax".
- We ignore the colon and always use the same algorithm:
- try a data file, and if none exists parse the 1003.1 syntax. */
- if (tz && *tz == ':')
- ++tz;
+ __libc_lock_lock (tzset_lock);
- /* Check whether the value changes since the last run. */
- if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0)
- /* No change, simply return. */
- return;
+ tzset_internal (0, 0);
- tz_rules[0].name = NULL;
- tz_rules[1].name = NULL;
+ __libc_lock_unlock (tzset_lock);
- /* Save the value of `tz'. */
- if (old_tz != NULL)
- free (old_tz);
- old_tz = tz ? __strdup (tz) : NULL;
+ return __tzname_cur_max;
+}
+\f
+static char *old_tz;
- /* Try to read a data file. */
- __tzfile_read (tz);
- if (__use_tzfile)
- return;
+static void
+internal_function
+update_vars (void)
+{
+ __daylight = tz_rules[0].offset != tz_rules[1].offset;
+ __timezone = -tz_rules[0].offset;
+ __tzname[0] = (char *) tz_rules[0].name;
+ __tzname[1] = (char *) tz_rules[1].name;
- /* No data file found. Default to UTC if nothing specified. */
+ /* Keep __tzname_cur_max up to date. */
+ size_t len0 = strlen (__tzname[0]);
+ size_t len1 = strlen (__tzname[1]);
+ if (len0 > __tzname_cur_max)
+ __tzname_cur_max = len0;
+ if (len1 > __tzname_cur_max)
+ __tzname_cur_max = len1;
+}
- if (tz == NULL || *tz == '\0')
- {
- tz_rules[0].name = tz_rules[1].name = "UTC";
- tz_rules[0].type = tz_rules[1].type = J0;
- tz_rules[0].m = tz_rules[0].n = tz_rules[0].d = 0;
- tz_rules[1].m = tz_rules[1].n = tz_rules[1].d = 0;
- tz_rules[0].secs = tz_rules[1].secs = 0;
- tz_rules[0].offset = tz_rules[1].offset = 0L;
- tz_rules[0].change = tz_rules[1].change = (time_t) -1;
- tz_rules[0].computed_for = tz_rules[1].computed_for = 0;
- return;
- }
+/* Parse the POSIX TZ-style string. */
+void
+__tzset_parse_tz (tz)
+ const char *tz;
+{
+ register size_t l;
+ char *tzbuf;
+ unsigned short int hh, mm, ss;
+ unsigned short int whichrule;
/* Clear out old state and reset to unnamed UTC. */
memset (tz_rules, 0, sizeof tz_rules);
if (sscanf (tz, "%[^0-9,+-]", tzbuf) != 1 ||
(l = strlen (tzbuf)) < 3)
- return;
+ goto out;
tz_rules[0].name = __tzstring (tzbuf);
/* Figure out the standard offset from UTC. */
if (*tz == '\0' || (*tz != '+' && *tz != '-' && !isdigit (*tz)))
- return;
+ goto out;
if (*tz == '-' || *tz == '+')
tz_rules[0].offset = *tz++ == '-' ? 1L : -1L;
switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
default:
- return;
+ tz_rules[0].offset = 0;
+ goto out;
case 1:
mm = 0;
case 2:
break;
}
tz_rules[0].offset *= (min (ss, 59) + (min (mm, 59) * 60) +
- (min (hh, 23) * 60 * 60));
+ (min (hh, 24) * 60 * 60));
for (l = 0; l < 3; ++l)
{
}
out:
- /* We know the offset now, set `__timezone'. */
- __timezone = -tz_rules[0].offset;
+ update_vars ();
}
-\f
-/* Maximum length of a timezone name. __tz_compute keeps this up to date
- (never decreasing it) when ! __use_tzfile.
- tzfile.c keeps it up to date when __use_tzfile. */
-size_t __tzname_cur_max;
-long int
-__tzname_max ()
+/* Interpret the TZ envariable. */
+static void
+internal_function
+tzset_internal (always, explicit)
+ int always;
+ int explicit;
{
- __libc_lock_lock (tzset_lock);
+ static int is_initialized;
+ register const char *tz;
- tzset_internal (0);
+ if (is_initialized && !always)
+ return;
+ is_initialized = 1;
- __libc_lock_unlock (tzset_lock);
+ /* Examine the TZ environment variable. */
+ tz = getenv ("TZ");
+ if (tz == NULL && !explicit)
+ /* Use the site-wide default. This is a file name which means we
+ would not see changes to the file if we compare only the file
+ name for change. We want to notice file changes if tzset() has
+ been called explicitly. Leave TZ as NULL in this case. */
+ tz = TZDEFAULT;
+ if (tz && *tz == '\0')
+ /* User specified the empty string; use UTC explicitly. */
+ tz = "Universal";
- return __tzname_cur_max;
+ /* A leading colon means "implementation defined syntax".
+ We ignore the colon and always use the same algorithm:
+ try a data file, and if none exists parse the 1003.1 syntax. */
+ if (tz && *tz == ':')
+ ++tz;
+
+ /* Check whether the value changed since the last run. */
+ if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0)
+ /* No change, simply return. */
+ return;
+
+ if (tz == NULL)
+ /* No user specification; use the site-wide default. */
+ tz = TZDEFAULT;
+
+ tz_rules[0].name = NULL;
+ tz_rules[1].name = NULL;
+
+ /* Save the value of `tz'. */
+ free (old_tz);
+ old_tz = tz ? __strdup (tz) : NULL;
+
+ /* Try to read a data file. */
+ __tzfile_read (tz, 0, NULL);
+ if (__use_tzfile)
+ return;
+
+ /* No data file found. Default to UTC if nothing specified. */
+
+ if (tz == NULL || *tz == '\0'
+ || (TZDEFAULT != NULL && strcmp (tz, TZDEFAULT) == 0))
+ {
+ tz_rules[0].name = tz_rules[1].name = "UTC";
+ tz_rules[0].type = tz_rules[1].type = J0;
+ tz_rules[0].m = tz_rules[0].n = tz_rules[0].d = 0;
+ tz_rules[1].m = tz_rules[1].n = tz_rules[1].d = 0;
+ tz_rules[0].secs = tz_rules[1].secs = 0;
+ tz_rules[0].offset = tz_rules[1].offset = 0L;
+ tz_rules[0].change = tz_rules[1].change = (time_t) -1;
+ tz_rules[0].computed_for = tz_rules[1].computed_for = 0;
+ update_vars ();
+ return;
+ }
+
+ __tzset_parse_tz (tz);
}
\f
/* Figure out the exact time (as a time_t) in YEAR
when the change described by RULE will occur and
- put it in RULE->change, saving YEAR in RULE->computed_for.
- Return nonzero if successful, zero on failure. */
-static int
+ put it in RULE->change, saving YEAR in RULE->computed_for. */
+static void
internal_function
compute_change (rule, year)
tz_rule *rule;
int year;
{
register time_t t;
- int y;
if (year != -1 && rule->computed_for == year)
- /* Operations on times in 1969 will be slower. Oh well. */
- return 1;
+ /* Operations on times in 2 BC will be slower. Oh well. */
+ return;
/* First set T to January 1st, 0:00:00 GMT in YEAR. */
- t = 0;
- for (y = 1970; y < year; ++y)
- t += SECSPERDAY * (__isleap (y) ? 366 : 365);
+ if (year > 1970)
+ t = ((year - 1970) * 365
+ + /* Compute the number of leapdays between 1970 and YEAR
+ (exclusive). There is a leapday every 4th year ... */
+ + ((year - 1) / 4 - 1970 / 4)
+ /* ... except every 100th year ... */
+ - ((year - 1) / 100 - 1970 / 100)
+ /* ... but still every 400th year. */
+ + ((year - 1) / 400 - 1970 / 400)) * SECSPERDAY;
+ else
+ t = 0;
switch (rule->type)
{
rule->change = t - rule->offset + rule->secs;
rule->computed_for = year;
- return 1;
}
/* Figure out the correct timezone for TM and set `__tzname',
- `__timezone', and `__daylight' accordingly. Return nonzero on
- success, zero on failure. */
-static int
+ `__timezone', and `__daylight' accordingly. */
+void
internal_function
-tz_compute (tm)
- const struct tm *tm;
+__tz_compute (timer, tm, use_localtime)
+ time_t timer;
+ struct tm *tm;
+ int use_localtime;
{
- if (! compute_change (&tz_rules[0], 1900 + tm->tm_year)
- || ! compute_change (&tz_rules[1], 1900 + tm->tm_year))
- return 0;
- /* We have to distinguish between northern and southern hemisphere.
- For the later the daylight saving time ends in the next year.
- It is easier to detect this after first computing the time for the
- wrong year since now we simply can compare the times to switch. */
- if (tz_rules[0].change > tz_rules[1].change
- && ! compute_change (&tz_rules[1], 1900 + tm->tm_year + 1))
- return 0;
-
- __daylight = tz_rules[0].offset != tz_rules[1].offset;
- __timezone = -tz_rules[0].offset;
- __tzname[0] = (char *) tz_rules[0].name;
- __tzname[1] = (char *) tz_rules[1].name;
+ compute_change (&tz_rules[0], 1900 + tm->tm_year);
+ compute_change (&tz_rules[1], 1900 + tm->tm_year);
- {
- /* Keep __tzname_cur_max up to date. */
- size_t len0 = strlen (__tzname[0]);
- size_t len1 = strlen (__tzname[1]);
- if (len0 > __tzname_cur_max)
- __tzname_cur_max = len0;
- if (len1 > __tzname_cur_max)
- __tzname_cur_max = len1;
- }
-
- return 1;
+ if (use_localtime)
+ {
+ int isdst;
+
+ /* We have to distinguish between northern and southern
+ hemisphere. For the latter the daylight saving time
+ ends in the next year. */
+ if (__builtin_expect (tz_rules[0].change
+ > tz_rules[1].change, 0))
+ isdst = (timer < tz_rules[1].change
+ || timer >= tz_rules[0].change);
+ else
+ isdst = (timer >= tz_rules[0].change
+ && timer < tz_rules[1].change);
+ tm->tm_isdst = isdst;
+ tm->tm_zone = __tzname[isdst];
+ tm->tm_gmtoff = tz_rules[isdst].offset;
+ }
}
\f
/* Reinterpret the TZ environment variable and set `tzname'. */
{
__libc_lock_lock (tzset_lock);
- tzset_internal (1);
+ tzset_internal (1, 1);
if (!__use_tzfile)
{
/* 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.
- By analogy we apply the same rule to gmtime_r. */
- tzset_internal (tp == &_tmbuf);
+ This is a good idea since this allows at least a bit more parallelism. */
+ tzset_internal (tp == &_tmbuf && use_localtime, 1);
if (__use_tzfile)
- {
- if (! __tzfile_compute (*timer, use_localtime,
- &leap_correction, &leap_extra_secs, tp))
- tp = NULL;
- }
+ __tzfile_compute (*timer, use_localtime, &leap_correction,
+ &leap_extra_secs, tp);
else
{
- if (! (__offtime (timer, 0, tp) && tz_compute (tp)))
+ if (! __offtime (timer, 0, tp))
tp = NULL;
+ else
+ __tz_compute (*timer, tp, use_localtime);
leap_correction = 0L;
leap_extra_secs = 0;
}
if (tp)
{
- if (use_localtime)
- {
- if (!__use_tzfile)
- {
- int isdst = (*timer >= tz_rules[0].change
- && *timer < tz_rules[1].change);
- tp->tm_isdst = isdst;
- tp->tm_zone = __tzname[isdst];
- tp->tm_gmtoff = tz_rules[isdst].offset;
- }
- }
- else
+ if (! use_localtime)
{
tp->tm_isdst = 0;
tp->tm_zone = "GMT";
return tp;
}
+
+
+libc_freeres_fn (free_mem)
+{
+ while (tzstring_list != NULL)
+ {
+ struct tzstring_l *old = tzstring_list;
+
+ tzstring_list = tzstring_list->next;
+ free (old);
+ }
+ free (old_tz);
+ old_tz = NULL;
+}
projects / platform / upstream / glibc.git / blobdiff