-/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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>
+#include <bits/libc-lock.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
-/* Defined in mktime.c. */
-extern const unsigned short int __mon_yday[2][13];
#define NOID
-#include "tzfile.h"
-
-extern int __use_tzfile;
-extern void __tzfile_read __P ((const char *file));
-extern void __tzfile_default __P ((char *std, char *dst,
- long int stdoff, long int dstoff));
-extern int __tz_compute __P ((time_t timer, const struct tm *tm));
+#include <timezone/tzfile.h>
char *__tzname[2] = { (char *) "GMT", (char *) "GMT" };
int __daylight = 0;
weak_alias (__daylight, daylight)
weak_alias (__timezone, timezone)
+/* This locks all the state variables in tzfile.c and this file. */
+__libc_lock_define_initialized (static, tzset_lock)
+
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
timezone given in the POSIX standard TZ envariable. */
typedef struct
{
- char *name;
+ const char *name;
/* When to change. */
enum { J0, J1, M } type; /* Interpretation of: */
static tz_rule tz_rules[2];
-static int compute_change __P ((tz_rule *rule, int year));
+static void compute_change (tz_rule *rule, int year) __THROW internal_function;
+static void tzset_internal (int always, int explicit)
+ __THROW internal_function;
\f
-static char *old_tz = NULL;
-
-/* Interpret the TZ envariable. */
-void __tzset_internal __P ((int always));
-void
-__tzset_internal (always)
- int always;
+/* List of buffers containing time zone strings. */
+struct tzstring_l
{
- static int is_initialized = 0;
- register const char *tz;
- register size_t l;
- unsigned short int hh, mm, ss;
- unsigned short int whichrule;
+ struct tzstring_l *next;
+ size_t len; /* strlen(data) - doesn't count terminating NUL! */
+ char data[0];
+};
+
+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.
+ Don't modify the returned string. */
+char *
+__tzstring (const char *s)
+{
+ char *p;
+ struct tzstring_l *t, *u, *new;
+ 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. */
+ for (u = t = tzstring_list; t; u = t, t = t->next)
+ if (len <= t->len)
+ {
+ p = &t->data[t->len - len];
+ if (strcmp (s, p) == 0)
+ return p;
+ }
- if (is_initialized && !always)
- return;
- is_initialized = 1;
+ /* Not found; allocate a new buffer. */
+ new = malloc (sizeof (struct tzstring_l) + len + 1);
+ if (!new)
+ return NULL;
- /* 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";
+ new->next = NULL;
+ new->len = len;
+ strcpy (new->data, s);
- /* 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;
+ if (u)
+ u->next = new;
+ else
+ tzstring_list = new;
- /* 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;
+ return new->data;
+}
+\f
+/* 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;
- /* Free old storage. */
- if (tz_rules[0].name != NULL && *tz_rules[0].name != '\0')
- free ((void *) tz_rules[0].name);
- if (tz_rules[1].name != NULL && *tz_rules[1].name != '\0' &&
- tz_rules[1].name != tz_rules[0].name)
- free ((void *) tz_rules[1].name);
- tz_rules[0].name = NULL;
- tz_rules[1].name = NULL;
+long int
+__tzname_max ()
+{
+ __libc_lock_lock (tzset_lock);
- /* Save the value of `tz'. */
- if (old_tz != NULL)
- free (old_tz);
- old_tz = tz ? __strdup (tz) : NULL;
+ tzset_internal (0, 0);
- /* Try to read a data file. */
- __tzfile_read (tz);
- if (__use_tzfile)
- return;
+ __libc_lock_unlock (tzset_lock);
- /* No data file found. Default to UTC if nothing specified. */
+ return __tzname_cur_max;
+}
+\f
+static char *old_tz;
- if (tz == NULL || *tz == '\0')
- {
- static const char UTC[] = "UTC";
- size_t len = sizeof UTC;
- tz_rules[0].name = (char *) malloc (len);
- if (tz_rules[0].name == NULL)
- return;
- tz_rules[1].name = (char *) malloc (len);
- if (tz_rules[1].name == NULL)
- return;
- memcpy ((void *) tz_rules[0].name, UTC, len);
- memcpy ((void *) tz_rules[1].name, UTC, len);
- 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;
- }
+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;
+
+ /* 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;
+}
+
+/* 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);
- tz_rules[0].name = tz_rules[1].name = (char *) "";
+ tz_rules[0].name = tz_rules[1].name = "";
/* Get the standard timezone name. */
- tz_rules[0].name = (char *) malloc (strlen (tz) + 1);
- if (tz_rules[0].name == NULL)
- {
- /* Clear the old tz name so we will try again. */
- free (old_tz);
- old_tz = NULL;
- return;
- }
+ tzbuf = strdupa (tz);
- if (sscanf (tz, "%[^0-9,+-]", tz_rules[0].name) != 1 ||
- (l = strlen(tz_rules[0].name)) < 3)
- {
- free (tz_rules[0].name);
- tz_rules[0].name = (char *) "";
- return;
- }
+ if (sscanf (tz, "%[^0-9,+-]", tzbuf) != 1 ||
+ (l = strlen (tzbuf)) < 3)
+ goto out;
- {
- char *n = realloc ((void *) tz_rules[0].name, l + 1);
- if (n != NULL)
- tz_rules[0].name = n;
- }
+ tz_rules[0].name = __tzstring (tzbuf);
tz += l;
/* 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)
{
/* Get the DST timezone name (if any). */
if (*tz != '\0')
{
- char *n = malloc (strlen (tz) + 1);
- if (n != NULL)
- {
- tz_rules[1].name = n;
- if (sscanf (tz, "%[^0-9,+-]", tz_rules[1].name) != 1 ||
- (l = strlen (tz_rules[1].name)) < 3)
- {
- free (n);
- tz_rules[1].name = (char *) "";
- goto done_names; /* Punt on name, set up the offsets. */
- }
- n = realloc ((void *) tz_rules[1].name, l + 1);
- if (n != NULL)
- tz_rules[1].name = n;
+ char *n = tzbuf + strlen (tzbuf) + 1;
+ if (sscanf (tz, "%[^0-9,+-]", n) != 1 ||
+ (l = strlen (n)) < 3)
+ goto done_names; /* Punt on name, set up the offsets. */
- tz += l;
- }
+ tz_rules[1].name = __tzstring (n);
+
+ tz += l;
/* Figure out the DST offset from GMT. */
if (*tz == '-' || *tz == '+')
if (l < 2 && *tz == ':')
++tz;
}
+ if (*tz == '\0' || (tz[0] == ',' && tz[1] == '\0'))
+ {
+ /* There is no rule. See if there is a default rule file. */
+ __tzfile_default (tz_rules[0].name, tz_rules[1].name,
+ tz_rules[0].offset, tz_rules[1].offset);
+ if (__use_tzfile)
+ {
+ free (old_tz);
+ old_tz = NULL;
+ return;
+ }
+ }
}
else
- /* There is no DST. */
- tz_rules[1].name = tz_rules[0].name;
-
- done_names:
-
- if (*tz == '\0' || (tz[0] == ',' && tz[1] == '\0'))
{
- /* There is no rule. See if there is a default rule file. */
- __tzfile_default (tz_rules[0].name, tz_rules[1].name,
- tz_rules[0].offset, tz_rules[1].offset);
- if (__use_tzfile)
- {
- free (old_tz);
- old_tz = NULL;
- return;
- }
+ /* There is no DST. */
+ tz_rules[1].name = tz_rules[0].name;
+ tz_rules[1].offset = tz_rules[0].offset;
+ goto out;
}
+ done_names:
/* Figure out the standard <-> DST rules. */
for (whichrule = 0; whichrule < 2; ++whichrule)
{
register tz_rule *tzr = &tz_rules[whichrule];
- if (*tz == ',')
- {
- ++tz;
- if (*tz == '\0')
- return;
- }
+ /* Ignore comma to support string following the incorrect
+ specification in early POSIX.1 printings. */
+ tz += *tz == ',';
/* Get the date of the change. */
if (*tz == 'J' || isdigit (*tz))
char *end;
tzr->type = *tz == 'J' ? J1 : J0;
if (tzr->type == J1 && !isdigit (*++tz))
- return;
+ goto out;
tzr->d = (unsigned short int) strtoul (tz, &end, 10);
if (end == tz || tzr->d > 365)
- return;
+ goto out;
else if (tzr->type == J1 && tzr->d == 0)
- return;
+ goto out;
tz = end;
}
else if (*tz == 'M')
&tzr->m, &tzr->n, &tzr->d, &n) != 3 ||
tzr->m < 1 || tzr->m > 12 ||
tzr->n < 1 || tzr->n > 5 || tzr->d > 6)
- return;
+ goto out;
tz += n;
}
else if (*tz == '\0')
}
}
else
- return;
+ goto out;
if (*tz != '\0' && *tz != '/' && *tz != ',')
- return;
+ goto out;
else if (*tz == '/')
{
/* Get the time of day of the change. */
++tz;
if (*tz == '\0')
- return;
+ goto out;
switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
default:
tzr->computed_for = -1;
}
+
+ out:
+ 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;
{
- __tzset_internal (0);
+ static int is_initialized;
+ register const char *tz;
- return __tzname_cur_max;
+ if (is_initialized && !always)
+ return;
+ is_initialized = 1;
+
+ /* 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";
+
+ /* 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)
{
case M:
/* Mm.n.d - Nth "Dth day" of month M. */
{
- register int i, d, m1, yy0, yy1, yy2, dow;
- register const unsigned short int *myday =
+ unsigned int i;
+ int d, m1, yy0, yy1, yy2, dow;
+ const unsigned short int *myday =
&__mon_yday[__isleap (year)][rule->m];
/* First add SECSPERDAY for each day in months before M. */
d += 7;
for (i = 1; i < rule->n; ++i)
{
- if (d + 7 >= myday[0] - myday[-1])
+ if (d + 7 >= (int) myday[0] - myday[-1])
break;
d += 7;
}
rule->change = t - rule->offset + rule->secs;
rule->computed_for = year;
- return 1;
}
-/* Figure out the correct timezone for *TIMER and TM (which must be the same)
- and set `__tzname', `__timezone', and `__daylight' accordingly.
- Return nonzero on success, zero on failure. */
-int
-__tz_compute (timer, tm)
+/* Figure out the correct timezone for TM and set `__tzname',
+ `__timezone', and `__daylight' accordingly. */
+void
+internal_function
+__tz_compute (timer, tm, use_localtime)
time_t timer;
- const struct tm *tm;
+ struct tm *tm;
+ int use_localtime;
{
- __tzset_internal (0);
-
- if (! compute_change (&tz_rules[0], 1900 + tm->tm_year) ||
- ! compute_change (&tz_rules[1], 1900 + tm->tm_year))
- return 0;
-
- __daylight = timer >= tz_rules[0].change && timer < tz_rules[1].change;
- __timezone = tz_rules[__daylight ? 1 : 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
-#include <bits/libc-lock.h>
-
-/* This locks all the state variables in tzfile.c and this file. */
-__libc_lock_define (, __tzset_lock)
-
/* Reinterpret the TZ environment variable and set `tzname'. */
#undef tzset
void
__tzset (void)
{
- __libc_lock_lock (__tzset_lock);
+ __libc_lock_lock (tzset_lock);
- __tzset_internal (1);
+ tzset_internal (1, 1);
if (!__use_tzfile)
{
__tzname[1] = (char *) tz_rules[1].name;
}
- __libc_lock_unlock (__tzset_lock);
+ __libc_lock_unlock (tzset_lock);
}
weak_alias (__tzset, tzset)
+\f
+/* Return the `struct tm' representation of *TIMER in the local timezone.
+ Use local time if USE_LOCALTIME is nonzero, UTC otherwise. */
+struct tm *
+__tz_convert (const time_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, 1);
+
+ if (__use_tzfile)
+ __tzfile_compute (*timer, use_localtime, &leap_correction,
+ &leap_extra_secs, tp);
+ else
+ {
+ 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)
+ {
+ tp->tm_isdst = 0;
+ tp->tm_zone = "GMT";
+ tp->tm_gmtoff = 0L;
+ }
+
+ if (__offtime (timer, tp->tm_gmtoff - leap_correction, tp))
+ tp->tm_sec += leap_extra_secs;
+ else
+ tp = NULL;
+ }
+
+ __libc_lock_unlock (tzset_lock);
+
+ 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