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#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include "local.h"
#define sscanf siscanf /* avoid to pull in FP functions. */
#define TZNAME_MIN 3 /* POSIX min TZ abbr size local def */
#define TZNAME_MAX 10 /* POSIX max TZ abbr size local def */
static char __tzname_std[TZNAME_MAX + 2];
static char __tzname_dst[TZNAME_MAX + 2];
static char *prev_tzenv = NULL;
void
_tzset_unlocked_r (struct _reent *reent_ptr)
{
char *tzenv;
unsigned short hh, mm, ss, m, w, d;
int sign, n;
int i, ch;
long offset0, offset1;
__tzinfo_type *tz = __gettzinfo ();
struct __tzrule_struct default_tzrule = {'J', 0, 0, 0, 0, (time_t)0, 0L };
if ((tzenv = _getenv_r (reent_ptr, "TZ")) == NULL)
{
_timezone = 0;
_daylight = 0;
_tzname[0] = "GMT";
_tzname[1] = "GMT";
tz->__tzrule[0] = default_tzrule;
tz->__tzrule[1] = default_tzrule;
free(prev_tzenv);
prev_tzenv = NULL;
return;
}
if (prev_tzenv != NULL && strcmp(tzenv, prev_tzenv) == 0)
return;
free(prev_tzenv);
prev_tzenv = _malloc_r (reent_ptr, strlen(tzenv) + 1);
if (prev_tzenv != NULL)
strcpy (prev_tzenv, tzenv);
/* default to unnamed UTC in case of error */
_timezone = 0;
_daylight = 0;
_tzname[0] = "";
_tzname[1] = "";
tz->__tzrule[0] = default_tzrule;
tz->__tzrule[1] = default_tzrule;
/* ignore implementation-specific format specifier */
if (*tzenv == ':')
++tzenv;
/* allow POSIX angle bracket < > quoted signed alphanumeric tz abbr e.g. <MESZ+0330> */
if (*tzenv == '<')
{
++tzenv;
/* quit if no items, too few or too many chars, or no close quote '>' */
if (sscanf (tzenv, "%11[-+0-9A-Za-z]%n", __tzname_std, &n) <= 0
|| n < TZNAME_MIN || TZNAME_MAX < n || '>' != tzenv[n])
return;
++tzenv; /* bump for close quote '>' */
}
else
{
/* allow POSIX unquoted alphabetic tz abbr e.g. MESZ */
if (sscanf (tzenv, "%11[A-Za-z]%n", __tzname_std, &n) <= 0
|| n < TZNAME_MIN || TZNAME_MAX < n)
return;
}
tzenv += n;
sign = 1;
if (*tzenv == '-')
{
sign = -1;
++tzenv;
}
else if (*tzenv == '+')
++tzenv;
mm = 0;
ss = 0;
if (sscanf (tzenv, "%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n) < 1)
return;
offset0 = sign * (ss + SECSPERMIN * mm + SECSPERHOUR * hh);
tzenv += n;
/* allow POSIX angle bracket < > quoted signed alphanumeric tz abbr e.g. <MESZ+0330> */
if (*tzenv == '<')
{
++tzenv;
/* quit if no items, too few or too many chars, or no close quote '>' */
if (sscanf (tzenv, "%11[-+0-9A-Za-z]%n", __tzname_dst, &n) <= 0 && tzenv[0] == '>')
{ /* No dst */
_tzname[0] = __tzname_std;
_tzname[1] = _tzname[0];
tz->__tzrule[0].offset = offset0;
_timezone = offset0;
return;
}
else if (n < TZNAME_MIN || TZNAME_MAX < n || '>' != tzenv[n])
{ /* error */
return;
}
++tzenv; /* bump for close quote '>' */
}
else
{
/* allow POSIX unquoted alphabetic tz abbr e.g. MESZ */
if (sscanf (tzenv, "%11[A-Za-z]%n", __tzname_dst, &n) <= 0)
{ /* No dst */
_tzname[0] = __tzname_std;
_tzname[1] = _tzname[0];
tz->__tzrule[0].offset = offset0;
_timezone = offset0;
return;
}
else if (n < TZNAME_MIN || TZNAME_MAX < n)
{ /* error */
return;
}
}
tzenv += n;
/* otherwise we have a dst name, look for the offset */
sign = 1;
if (*tzenv == '-')
{
sign = -1;
++tzenv;
}
else if (*tzenv == '+')
++tzenv;
hh = 0;
mm = 0;
ss = 0;
n = 0;
if (sscanf (tzenv, "%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n) <= 0)
offset1 = offset0 - 3600;
else
offset1 = sign * (ss + SECSPERMIN * mm + SECSPERHOUR * hh);
tzenv += n;
for (i = 0; i < 2; ++i)
{
if (*tzenv == ',')
++tzenv;
if (*tzenv == 'M')
{
if (sscanf (tzenv, "M%hu%n.%hu%n.%hu%n", &m, &n, &w, &n, &d, &n) != 3 ||
m < 1 || m > 12 || w < 1 || w > 5 || d > 6)
return;
tz->__tzrule[i].ch = 'M';
tz->__tzrule[i].m = m;
tz->__tzrule[i].n = w;
tz->__tzrule[i].d = d;
tzenv += n;
}
else
{
char *end;
if (*tzenv == 'J')
{
ch = 'J';
++tzenv;
}
else
ch = 'D';
d = strtoul (tzenv, &end, 10);
/* if unspecified, default to US settings */
/* From 1987-2006, US was M4.1.0,M10.5.0, but starting in 2007 is
* M3.2.0,M11.1.0 (2nd Sunday March through 1st Sunday November) */
if (end == tzenv)
{
if (i == 0)
{
tz->__tzrule[0].ch = 'M';
tz->__tzrule[0].m = 3;
tz->__tzrule[0].n = 2;
tz->__tzrule[0].d = 0;
}
else
{
tz->__tzrule[1].ch = 'M';
tz->__tzrule[1].m = 11;
tz->__tzrule[1].n = 1;
tz->__tzrule[1].d = 0;
}
}
else
{
tz->__tzrule[i].ch = ch;
tz->__tzrule[i].d = d;
}
tzenv = end;
}
/* default time is 02:00:00 am */
hh = 2;
mm = 0;
ss = 0;
n = 0;
if (*tzenv == '/')
if (sscanf (tzenv, "/%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n) <= 0)
{
/* error in time format, restore tz rules to default and return */
tz->__tzrule[0] = default_tzrule;
tz->__tzrule[1] = default_tzrule;
return;
}
tz->__tzrule[i].s = ss + SECSPERMIN * mm + SECSPERHOUR * hh;
tzenv += n;
}
tz->__tzrule[0].offset = offset0;
tz->__tzrule[1].offset = offset1;
_tzname[0] = __tzname_std;
_tzname[1] = __tzname_dst;
__tzcalc_limits (tz->__tzyear);
_timezone = tz->__tzrule[0].offset;
_daylight = tz->__tzrule[0].offset != tz->__tzrule[1].offset;
}
void
_tzset_r (struct _reent *reent_ptr)
{
TZ_LOCK;
_tzset_unlocked_r (reent_ptr);
TZ_UNLOCK;
}
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