newlib-cygwin/newlib/libc/time/tzset_r.c

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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"
static char __tzname_std[11];
static char __tzname_dst[11];
static char *prev_tzenv = NULL;
/* default to GMT */
char *_tzname[2] = {"GMT" "GMT"};
int _daylight = 0;
time_t _timezone = (time_t)0;
int __tzyear = 0;
int __tznorth = 1;
__tzrule_type __tzrule[2] = { {'J', 0, 0, 0, 0, (time_t)0, 0 },
{'J', 0, 0, 0, 0, (time_t)0, 0 } };
_VOID
_DEFUN (_tzset_r, (reent_ptr),
struct _reent *reent_ptr)
{
char *tzenv;
int hh, mm, ss, sign, m, w, d, n;
int i, ch;
if ((tzenv = _getenv_r (reent_ptr, "TZ")) == NULL)
{
TZ_LOCK;
_timezone = (time_t)0;
_daylight = 0;
_tzname[0] = "GMT";
_tzname[1] = "GMT";
TZ_UNLOCK;
return;
}
TZ_LOCK;
if (prev_tzenv != NULL && strcmp(tzenv, prev_tzenv) == 0)
{
TZ_UNLOCK;
return;
}
free(prev_tzenv);
prev_tzenv = _strdup_r (reent_ptr, tzenv);
/* ignore implementation-specific format specifier */
if (*tzenv == ':')
++tzenv;
if (sscanf (tzenv, "%10[^0-9,+-]%n", __tzname_std, &n) <= 0)
{
TZ_UNLOCK;
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)
{
TZ_UNLOCK;
return;
}
__tzrule[0].offset = sign * (ss + SECSPERMIN * mm + SECSPERHOUR * hh);
_tzname[0] = __tzname_std;
tzenv += n;
if (sscanf (tzenv, "%10[^0-9,+-]%n", __tzname_dst, &n) <= 0)
{
_tzname[1] = _tzname[0];
TZ_UNLOCK;
return;
}
else
_tzname[1] = __tzname_dst;
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;
if (sscanf (tzenv, "%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n) <= 0)
__tzrule[1].offset = __tzrule[0].offset - 3600;
else
__tzrule[1].offset = sign * (ss + SECSPERMIN * mm + SECSPERHOUR * hh);
tzenv += n;
if (*tzenv == ',')
++tzenv;
for (i = 0; i < 2; ++i)
{
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)
{
TZ_UNLOCK;
return;
}
__tzrule[i].ch = 'M';
__tzrule[i].m = m;
__tzrule[i].n = w;
__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 */
if (end == tzenv)
{
if (i == 0)
{
__tzrule[0].ch = 'M';
__tzrule[0].m = 4;
__tzrule[0].n = 1;
__tzrule[0].d = 0;
}
else
{
__tzrule[1].ch = 'M';
__tzrule[1].m = 10;
__tzrule[1].n = 5;
__tzrule[1].d = 0;
}
}
else
{
__tzrule[i].ch = ch;
__tzrule[i].d = d;
}
tzenv = end;
}
/* default time is 02:00:00 am */
hh = 2;
mm = 0;
ss = 0;
if (*tzenv == '/')
sscanf (tzenv, "%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n);
__tzrule[i].s = ss + SECSPERMIN * mm + SECSPERHOUR * hh;
}
__tzcalc_limits (__tzyear);
_timezone = (time_t)(__tzrule[0].offset);
_daylight = __tzrule[0].offset != __tzrule[1].offset;
TZ_UNLOCK;
}