-/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991,92,93,94,95,96,97,98 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.
+ 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.
-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.
+ 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.
-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., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ 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. */
-#include <ansidecl.h>
#include <ctype.h>
+#include <errno.h>
+#include <bits/libc-lock.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/* Defined in mktime.c. */
-extern CONST unsigned short int __mon_lengths[2][12];
+extern const unsigned short int __mon_yday[2][13];
+
+/* Defined in localtime.c. */
+extern struct tm _tmbuf;
#define NOID
-#include "tzfile.h"
+#include <timezone/tzfile.h>
extern int __use_tzfile;
-extern void EXFUN(__tzfile_read, (CONST char *file));
-extern void EXFUN(__tzfile_default, (char *std AND char *dst AND
- long int stdoff AND long int dstoff));
-extern int EXFUN(__tzfile_compute, (time_t, struct tm));
+extern void __tzfile_read __P ((const char *file));
+extern int __tzfile_compute __P ((time_t timer, int use_localtime,
+ long int *leap_correct, int *leap_hit,
+ struct tm *tp));
+extern void __tzfile_default __P ((const char *std, const char *dst,
+ long int stdoff, long int dstoff));
+extern char *__tzstring __P ((const char *string));
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 (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: */
/* tz_rules[0] is standard, tz_rules[1] is daylight. */
static tz_rule tz_rules[2];
+
+
+static int compute_change __P ((tz_rule *rule, int year)) internal_function;
+static int tz_compute __P ((time_t timer, const struct tm *tm))
+ internal_function;
+static void tzset_internal __P ((int always)) internal_function;
+\f
+/* Header for a list of buffers containing time zone strings. */
+struct tzstring_head
+{
+ struct tzstring_head *next;
+ /* The buffer itself immediately follows the header.
+ The buffer contains zero or more (possibly overlapping) strings.
+ The last string is followed by 2 '\0's instead of the usual 1. */
+};
+
+/* First in a list of buffers containing time zone strings.
+ All the buffers but the last are read-only. */
+static struct
+{
+ struct tzstring_head head;
+ char data[48];
+} tzstring_list;
+
+/* Size of the last buffer in the list, not counting its header. */
+static size_t tzstring_last_buffer_size = sizeof tzstring_list.data;
+
+/* Allocate a time zone string with given contents.
+ The string will never be moved or deallocated.
+ However, its contents may be shared with other such strings. */
+char *
+__tzstring (string)
+ const char *string;
+{
+ struct tzstring_head *h;
+ size_t needed;
+ char *p;
+
+ /* Look through time zone string list for a duplicate of this one. */
+ for (h = &tzstring_list.head; ; h = h->next)
+ {
+ for (p = (char *) (h + 1); p[0] | p[1]; ++p)
+ if (strcmp (p, string) == 0)
+ return p;
+ if (! h->next)
+ break;
+ }
+
+ /* No duplicate was found. Copy to the end of this buffer if there's room;
+ otherwise, append a large-enough new buffer to the list and use it. */
+ ++p;
+ needed = strlen (string) + 2; /* Need 2 trailing '\0's after last string. */
+
+ if ((size_t) ((char *) (h + 1) + tzstring_last_buffer_size - p) < needed)
+ {
+ size_t buffer_size = tzstring_last_buffer_size;
+ while ((buffer_size *= 2) < needed)
+ continue;
+ h = malloc (sizeof *h + buffer_size);
+ if (h == NULL)
+ return NULL;
+ h->next = NULL;
+ tzstring_last_buffer_size = buffer_size;
+ p = (char *) (h + 1);
+ }
+
+ return strncpy (p, string, needed);
+}
\f
-int __tzset_run = 0;
+static char *old_tz = NULL;
/* Interpret the TZ envariable. */
-void
-DEFUN_VOID(__tzset)
+static void
+internal_function
+tzset_internal (always)
+ int always;
{
- register CONST char *tz;
+ 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;
- /* Free old storage. */
- if (tz_rules[0].name != NULL && *tz_rules[0].name != '\0')
- free((PTR) tz_rules[0].name);
- if (tz_rules[1].name != NULL && *tz_rules[1].name != '\0' &&
- tz_rules[1].name != tz_rules[0].name)
- free((PTR) tz_rules[1].name);
+ 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;
+
+ /* 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;
- tz = getenv("TZ");
+ tz_rules[0].name = NULL;
+ tz_rules[1].name = NULL;
- if (tz != NULL && *tz == ':')
- {
- __tzfile_read(tz + 1);
- if (__use_tzfile)
- {
- __tzset_run = 1;
- return;
- }
- else
- tz = NULL;
- }
+ /* Save the value of `tz'. */
+ if (old_tz != NULL)
+ free (old_tz);
+ old_tz = tz ? __strdup (tz) : NULL;
+
+ /* Try to read a data file. */
+ __tzfile_read (tz);
+ if (__use_tzfile)
+ return;
+
+ /* No data file found. Default to UTC if nothing specified. */
if (tz == NULL || *tz == '\0')
{
- __tzfile_read((char *) NULL);
- if (!__use_tzfile)
- {
- 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 ((PTR) tz_rules[0].name, UTC, len);
- memcpy ((PTR) 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;
- }
- __tzset_run = 1;
+ 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;
}
/* 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)
- /* Don't set __tzset_run so we will try again. */
- return;
+ tzbuf = malloc (strlen (tz) + 1);
+ if (! tzbuf)
+ {
+ /* Clear the old tz name so we will try again. */
+ free (old_tz);
+ old_tz = NULL;
+ return;
+ }
- if (sscanf(tz, "%[^0-9,+-]", tz_rules[0].name) != 1 ||
- (l = strlen(tz_rules[0].name)) < 3)
+ if (sscanf (tz, "%[^0-9,+-]", tzbuf) != 1 ||
+ (l = strlen (tzbuf)) < 3)
{
- free (tz_rules[0].name);
- tz_rules[0].name = (char *) "";
+ free (tzbuf);
return;
}
- {
- char *n = realloc ((PTR) 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;
+ if (*tz == '\0' || (*tz != '+' && *tz != '-' && !isdigit (*tz)))
+ {
+ free (tzbuf);
+ return;
+ }
if (*tz == '-' || *tz == '+')
tz_rules[0].offset = *tz++ == '-' ? 1L : -1L;
switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
default:
+ free (tzbuf);
return;
case 1:
mm = 0;
case 3:
break;
}
- tz_rules[0].offset *= (min(ss, 59) + (min(mm, 59) * 60) +
- (min(hh, 12) * 60 * 60));
+ tz_rules[0].offset *= (min (ss, 59) + (min (mm, 59) * 60) +
+ (min (hh, 23) * 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)
+ 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_rules[1].name = __tzstring (n);
+
+ tz += l;
+
+ /* Figure out the DST offset from GMT. */
+ if (*tz == '-' || *tz == '+')
+ tz_rules[1].offset = *tz++ == '-' ? 1L : -1L;
+ else
+ tz_rules[1].offset = -1L;
+
+ switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
+ {
+ default:
+ /* Default to one hour later than standard time. */
+ tz_rules[1].offset = tz_rules[0].offset + (60 * 60);
+ break;
+
+ case 1:
+ mm = 0;
+ case 2:
+ ss = 0;
+ case 3:
+ tz_rules[1].offset *= (min (ss, 59) + (min (mm, 59) * 60) +
+ (min (hh, 23) * (60 * 60)));
+ break;
+ }
+ for (l = 0; l < 3; ++l)
{
- tz_rules[1].name = n;
- if (sscanf(tz, "%[^0-9,+-]", tz_rules[1].name) != 1 ||
- (l = strlen(tz_rules[1].name)) < 3)
+ while (isdigit (*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 (n);
- tz_rules[1].name = (char *) "";
- goto done_names; /* Punt on name, set up the offsets. */
+ free (old_tz);
+ old_tz = NULL;
+ free (tzbuf);
+ return;
}
- n = realloc ((PTR) tz_rules[1].name, l + 1);
- if (n != NULL)
- tz_rules[1].name = n;
}
}
-
- tz += l;
-
- /* Figure out the DST offset from GMT. */
- if (*tz == '-' || *tz == '+')
- tz_rules[1].offset = *tz++ == '-' ? 1L : -1L;
else
- tz_rules[1].offset = -1L;
-
- switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
- default:
- /* Default to one hour later than standard time. */
- tz_rules[1].offset = tz_rules[0].offset + (60 * 60);
- break;
-
- case 1:
- mm = 0;
- case 2:
- ss = 0;
- case 3:
- tz_rules[1].offset *= (min(ss, 59) + (min(mm, 59) * 60) +
- (min(hh, 12) * (60 * 60)));
- break;
- }
- for (l = 0; l < 3; ++l)
- {
- while (isdigit (*tz))
- ++tz;
- if (l < 2 && *tz == ':')
- ++tz;
+ /* There is no DST. */
+ tz_rules[1].name = tz_rules[0].name;
+ tz_rules[1].offset = tz_rules[0].offset;
+ free (tzbuf);
+ return;
}
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)
- {
- __tzset_run = 1;
- return;
- }
- }
+ free (tzbuf);
/* 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))
{
}
else
return;
-
+
if (*tz != '\0' && *tz != '/' && *tz != ',')
return;
else if (*tz == '/')
}
for (l = 0; l < 3; ++l)
{
- while (isdigit(*tz))
+ while (isdigit (*tz))
++tz;
if (l < 2 && *tz == ':')
++tz;
tzr->computed_for = -1;
}
-
- __tzset_run = 1;
}
\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. */
-long int __tzname_cur_max;
+size_t __tzname_cur_max;
long int
-DEFUN_VOID(__tzname_max)
+__tzname_max ()
{
- if (! __tzset_run)
- __tzset ();
+ __libc_lock_lock (tzset_lock);
+
+ tzset_internal (0);
+
+ __libc_lock_unlock (tzset_lock);
return __tzname_cur_max;
}
put it in RULE->change, saving YEAR in RULE->computed_for.
Return nonzero if successful, zero on failure. */
static int
-DEFUN(compute_change, (rule, year), tz_rule *rule AND int year)
+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;
-
+
/* First set T to January 1st, 0:00:00 GMT in YEAR. */
t = 0;
for (y = 1970; y < year; ++y)
case M:
/* Mm.n.d - Nth "Dth day" of month M. */
{
- register int i, d, m1, yy0, yy1, yy2, dow;
+ 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. */
- for (i = 0; i < rule->m - 1; ++i)
- t += __mon_lengths[__isleap (year)][i] * SECSPERDAY;
+ t += myday[-1] * SECSPERDAY;
/* Use Zeller's Congruence to get day-of-week of first day of month. */
m1 = (rule->m + 9) % 12 + 1;
d += 7;
for (i = 1; i < rule->n; ++i)
{
- if (d + 7 >= __mon_lengths[__isleap (year)][rule->m - 1])
+ if (d + 7 >= (int) myday[0] - myday[-1])
break;
d += 7;
}
/* T is now the Epoch-relative time of 0:00:00 GMT on the day we want.
Just add the time of day and local offset from GMT, and we're done. */
- rule->change = t + rule->offset + rule->secs;
+ 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
-DEFUN(__tz_compute, (timer, tm),
- time_t timer AND const struct tm *tm)
+static int
+internal_function
+tz_compute (timer, tm)
+ time_t timer;
+ const struct tm *tm;
{
- if (! __tzset_run)
- __tzset ();
-
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;
+ __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;
return 1;
}
+\f
+/* Reinterpret the TZ environment variable and set `tzname'. */
+#undef tzset
+
+void
+__tzset (void)
+{
+ __libc_lock_lock (tzset_lock);
+
+ tzset_internal (1);
+ if (!__use_tzfile)
+ {
+ /* Set `tzname'. */
+ __tzname[0] = (char *) tz_rules[0].name;
+ __tzname[1] = (char *) tz_rules[1].name;
+ }
+
+ __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.
+ By analogy we apply the same rule to gmtime_r. */
+ tzset_internal (tp == &_tmbuf);
+
+ if (__use_tzfile)
+ {
+ if (! __tzfile_compute (*timer, use_localtime,
+ &leap_correction, &leap_extra_secs, tp))
+ tp = NULL;
+ }
+ else
+ {
+ if (! (__offtime (timer, 0, tp) && tz_compute (*timer, tp)))
+ tp = NULL;
+ 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
+ {
+ 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;
+}
projects / platform / upstream / glibc.git / blobdiff