-/* Copyright (C) 1991 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 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
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
-#include <localeinfo.h>
#include <ctype.h>
#include <stddef.h>
#include <stdio.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 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));
char *__tzname[2] = { (char *) "GMT", (char *) "GMT" };
int __daylight = 0;
long int __timezone = 0L;
+weak_alias (__tzname, tzname)
+weak_alias (__daylight, daylight)
+weak_alias (__timezone, timezone)
+
#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
{
- CONST char *name;
+ char *name;
/* When to change. */
enum { J0, J1, M } type; /* Interpretation of: */
unsigned short int m, n, d; /* Month, week, day. */
- unsigned int secs:17; /* Time of day. */
+ unsigned int secs; /* Time of day. */
long int offset; /* Seconds east of GMT (west if < 0). */
/* tz_rules[0] is standard, tz_rules[1] is daylight. */
static tz_rule tz_rules[2];
\f
-static int tzset_run = 0;
+int __tzset_run = 0;
/* Interpret the TZ envariable. */
void
tz = getenv("TZ");
- if (*tz == ':')
+ if (tz != NULL && *tz == ':')
{
__tzfile_read(tz + 1);
if (__use_tzfile)
{
- tzset_run = 1;
+ __tzset_run = 1;
return;
}
else
}
if (tz == NULL || *tz == '\0')
- tz = _time_info->tz;
- if (tz == NULL || *tz == '\0')
{
__tzfile_read((char *) NULL);
if (!__use_tzfile)
{
- size_t len = strlen(_time_info->ut0) + 1;
+ 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, _time_info->ut0, len);
- memcpy((PTR) tz_rules[1].name, _time_info->ut0, len);
+ 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].change = tz_rules[1].change = (time_t) -1;
tz_rules[0].computed_for = tz_rules[1].computed_for = 0;
}
- tzset_run = 1;
+ __tzset_run = 1;
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 *) "";
+
/* Get the standard timezone name. */
- tz_rules[0].name = (char *) malloc(strlen(tz) + 1);
+ 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;
if (sscanf(tz, "%[^0-9,+-]", tz_rules[0].name) != 1 ||
(l = strlen(tz_rules[0].name)) < 3)
- return;
+ {
+ free (tz_rules[0].name);
+ tz_rules[0].name = (char *) "";
+ return;
+ }
- tz_rules[0].name = (char *) realloc((PTR) tz_rules[0].name, l + 1);
- if (tz_rules[0].name == NULL)
- return;
+ {
+ char *n = realloc ((PTR) tz_rules[0].name, l + 1);
+ if (n != NULL)
+ tz_rules[0].name = n;
+ }
tz += l;
- /* Figure out the standard offset from GMT. */
+ /* Figure out the standard offset from UTC. */
if (*tz == '\0' || (*tz != '+' && *tz != '-' && !isdigit(*tz)))
return;
tz_rules[0].offset = *tz++ == '-' ? 1L : -1L;
else
tz_rules[0].offset = -1L;
- switch (sscanf(tz, "%hu:%hu:%hu", &hh, &mm, &ss))
+ switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
default:
return;
break;
}
tz_rules[0].offset *= (min(ss, 59) + (min(mm, 59) * 60) +
- (min(hh, 12) * 60 * 60));
+ (min(hh, 23) * 60 * 60));
for (l = 0; l < 3; ++l)
{
}
/* Get the DST timezone name (if any). */
- if (*tz == '\0')
- tz_rules[1].name = "";
- else
+ if (*tz != '\0')
{
- tz_rules[1].name = (char *) malloc(strlen(tz) + 1);
- if (tz_rules[1].name == NULL)
- return;
- if (sscanf(tz, "%[^0-9,+-]", tz_rules[1].name) != 1 ||
- (l = strlen(tz_rules[1].name)) < 3)
- return;
- tz_rules[1].name = (char *) realloc((PTR) tz_rules[1].name, l + 1);
- if (tz_rules[1].name == NULL)
- return;
+ 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 ((PTR) tz_rules[1].name, l + 1);
+ if (n != NULL)
+ tz_rules[1].name = n;
+ }
}
tz += l;
tz_rules[1].offset = *tz++ == '-' ? 1L : -1L;
else
tz_rules[1].offset = -1L;
- if (*tz != '\0')
+
+ switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
- switch (sscanf(tz, "%hu:%hu:%hu", &hh, &mm, &ss))
- {
- default:
- hh = 0;
- case 1:
- mm = 0;
- case 2:
- ss = 0;
- case 3:
- break;
- }
+ 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)));
- for (l = 0; l < 3; ++l)
- {
- while (isdigit(*tz))
- ++tz;
- if (l < 2 && *tz == ':')
- ++tz;
- }
+ (min(hh, 23) * (60 * 60)));
+ break;
}
- else
+ for (l = 0; l < 3; ++l)
{
- /* Default to one hour later than standard time. */
- tz_rules[1].offset *= abs(tz_rules[0].offset);
- tz_rules[1].offset += 60 * 60;
+ while (isdigit (*tz))
+ ++tz;
+ if (l < 2 && *tz == ':')
+ ++tz;
}
- /* If no standard or DST offset was given, default to GMT
- for standard and one hour later than standard for DST. */
- if (*tz_rules[0].name == '\0')
- tz_rules[0].offset = 0L;
- if (*tz_rules[1].name == '\0')
- tz_rules[1].offset = tz_rules[0].offset + (60 * 60);
+ 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;
+ }
+ }
/* Figure out the standard <-> DST rules. */
for (whichrule = 0; whichrule < 2; ++whichrule)
{
register tz_rule *tzr = &tz_rules[whichrule];
-
- if (*tz != '\0' && *tz == ',')
+
+ if (*tz == ',')
{
++tz;
if (*tz == '\0')
return;
}
-
+
/* Get the date of the change. */
- if (*tz == 'J' || isdigit(*tz))
+ if (*tz == 'J' || isdigit (*tz))
{
char *end;
tzr->type = *tz == 'J' ? J1 : J0;
- if (tzr->type == J1 && !isdigit(*++tz))
+ if (tzr->type == J1 && !isdigit (*++tz))
return;
- tzr->n = (unsigned short int) strtoul(tz, &end, 10);
- if (end == tz || tzr->n > 365)
+ tzr->d = (unsigned short int) strtoul (tz, &end, 10);
+ if (end == tz || tzr->d > 365)
return;
- else if (tzr->type == J1 && tzr->n == 0)
+ else if (tzr->type == J1 && tzr->d == 0)
return;
- if (tzr->type == J1 && tzr->n == 60)
- /* Can't do February 29. */
- ++tzr->n;
tz = end;
}
else if (*tz == 'M')
{
+ int n;
tzr->type = M;
- if (sscanf(tz, "M%hu.%hu.%hu", &tzr->m, &tzr->n, &tzr->d) != 3)
- return;
- else if (tzr->m < 1 || tzr->m > 12 || tzr->n < 1 ||
- tzr->n > 5 || tzr->d > 6)
+ if (sscanf (tz, "M%hu.%hu.%hu%n",
+ &tzr->m, &tzr->n, &tzr->d, &n) != 3 ||
+ tzr->m < 1 || tzr->m > 12 ||
+ tzr->n < 1 || tzr->n > 5 || tzr->d > 6)
return;
+ tz += n;
}
else if (*tz == '\0')
{
- /* United States Federal Law, the equivalent of "M3.1.0,M8.5.0". */
+ /* United States Federal Law, the equivalent of "M4.1.0,M10.5.0". */
tzr->type = M;
if (tzr == &tz_rules[0])
{
- tzr->m = 3;
+ tzr->m = 4;
tzr->n = 1;
tzr->d = 0;
}
else
{
- tzr->m = 8;
+ tzr->m = 10;
tzr->n = 5;
tzr->d = 0;
}
}
else
return;
-
+
if (*tz != '\0' && *tz != '/' && *tz != ',')
return;
else if (*tz == '/')
++tz;
if (*tz == '\0')
return;
- switch (sscanf(tz, "%hu:%hu:%hu", &hh, &mm, &ss))
+ switch (sscanf (tz, "%hu:%hu:%hu", &hh, &mm, &ss))
{
default:
- return;
+ hh = 2; /* Default to 2:00 AM. */
case 1:
mm = 0;
case 2:
tzr->computed_for = -1;
}
- tzset_run = 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;
+
+long int
+DEFUN_VOID(__tzname_max)
+{
+ if (! __tzset_run)
+ __tzset ();
+
+ return __tzname_cur_max;
}
\f
/* Figure out the exact time (as a time_t) in YEAR
static int
DEFUN(compute_change, (rule, year), tz_rule *rule AND int year)
{
- register unsigned short int m = rule->m, n = rule->n, d = rule->d;
- struct tm tbuf;
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;
- memset((PTR) &tbuf, 0, sizeof(tbuf));
- tbuf.tm_year = year;
+ /* 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 (rule->type == M)
- {
- /* Defined in _offtime.c. */
- extern CONST unsigned short int __mon_lengths[2][12];
- unsigned short int ml = __mon_lengths[__isleap(tbuf.tm_year)][m - 1];
- tbuf.tm_mon = m - 1;
- if (n == 5)
- tbuf.tm_mday = ml;
- else
- tbuf.tm_mday = max((n - 1) * 7, 1);
- tbuf.tm_sec = rule->secs;
- t = mktime(&tbuf);
- if (t == (time_t) -1)
- return 0;
- if (tbuf.tm_wday != d)
- {
- if (d > tbuf.tm_wday)
- {
- tbuf.tm_mday -= 7;
- tbuf.tm_mday += tbuf.tm_wday - d;
- }
- else
- tbuf.tm_mday -= tbuf.tm_wday - d;
- if (tbuf.tm_mday < 1)
- tbuf.tm_mday += 7;
- else
- if (tbuf.tm_mday > ml) tbuf.tm_mday -= 7;
- t = mktime(&tbuf);
- if (t == (time_t) -1)
- return 0;
- }
- }
- else
+ switch (rule->type)
{
- tbuf.tm_mon = 0;
- if (rule->type == J1)
- --n;
- tbuf.tm_mday = n;
- tbuf.tm_sec = rule->secs;
- t = mktime(&tbuf);
- if (t == (time_t) -1)
- return 0;
+ case J1:
+ /* Jn - Julian day, 1 == January 1, 60 == March 1 even in leap years.
+ In non-leap years, or if the day number is 59 or less, just
+ add SECSPERDAY times the day number-1 to the time of
+ January 1, midnight, to get the day. */
+ t += (rule->d - 1) * SECSPERDAY;
+ if (rule->d >= 60 && __isleap (year))
+ t += SECSPERDAY;
+ break;
+
+ case J0:
+ /* n - Day of year.
+ Just add SECSPERDAY times the day number to the time of Jan 1st. */
+ t += rule->d * SECSPERDAY;
+ break;
+
+ 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 =
+ &__mon_yday[__isleap (year)][rule->m];
+
+ /* First add SECSPERDAY for each day in months before M. */
+ t += myday[-1] * SECSPERDAY;
+
+ /* Use Zeller's Congruence to get day-of-week of first day of month. */
+ m1 = (rule->m + 9) % 12 + 1;
+ yy0 = (rule->m <= 2) ? (year - 1) : year;
+ yy1 = yy0 / 100;
+ yy2 = yy0 % 100;
+ dow = ((26 * m1 - 2) / 10 + 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
+ if (dow < 0)
+ dow += 7;
+
+ /* DOW is the day-of-week of the first day of the month. Get the
+ day-of-month (zero-origin) of the first DOW day of the month. */
+ d = rule->d - dow;
+ if (d < 0)
+ d += 7;
+ for (i = 1; i < rule->n; ++i)
+ {
+ if (d + 7 >= myday[0] - myday[-1])
+ break;
+ d += 7;
+ }
+
+ /* D is the day-of-month (zero-origin) of the day we want. */
+ t += d * SECSPERDAY;
+ }
+ break;
}
- rule->change = t;
+ /* 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->computed_for = year;
return 1;
}
Return nonzero on success, zero on failure. */
int
DEFUN(__tz_compute, (timer, tm),
- time_t timer AND struct tm tm)
+ time_t timer AND const struct tm *tm)
{
- if (!tzset_run)
- __tzset();
+ if (! __tzset_run)
+ __tzset ();
- if (__use_tzfile)
- return __tzfile_compute(timer, tm);
-
- if (!compute_change(&tz_rules[0], tm.tm_year) ||
- !compute_change(&tz_rules[1], tm.tm_year))
+ 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;
__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;
+ }
+
return 1;
}
-
-long int
-DEFUN_VOID (__tzname_max)
-{
- size_t len0 = strlen (__tzname[0]), len1 = strlen (__tzname[1]);
- return len0 > len1 ? len0 : len1;
-}
+weak_alias (__tzset, tzset)
projects / kopensolaris-gnu / glibc.git / blobdiff