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/* localtime.cc: Wrapper of NetBSD tzcode support for Cygwin. See README file.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "perprocess.h"
#include "tz_posixrules.h"
#include <cygwin/version.h>
#include <stdlib.h>
#include <sys/_tz_structs.h>
static NO_COPY SRWLOCK tzset_guard = SRWLOCK_INIT;
// Convert these NetBSD rwlock ops into SRWLocks
#define rwlock_wrlock(X) AcquireSRWLockExclusive(&tzset_guard)
#define rwlock_unlock(X) ReleaseSRWLockExclusive(&tzset_guard)
// Set these NetBSD-related option #defines appropriately for Cygwin
//#define STD_INSPIRED // early-include private.h below does this
#define lint
#define HAVE_POSIX_DECLS 0
#define USG_COMPAT 1
#define NO_ERROR_IN_DST_GAP
#define state __state
// Turn a specific known kind of const parameter into non-const
#define __UNCONST(X) ((char *) (X))
// Turn off these NetBSD audit-related definitions
#define __aconst
#define _DIAGASSERT(X)
// Supply this Cygwin-specific function in advance of its use in localtime.c
static char *
tzgetwintzi (char *wildabbr, char *outbuf)
{
TIME_ZONE_INFORMATION tzi;
char *cp, *dst;
wchar_t *wsrc;
div_t d;
GetTimeZoneInformation (&tzi);
dst = cp = outbuf;
for (wsrc = tzi.StandardName; *wsrc; wsrc++)
if (*wsrc >= L'A' && *wsrc <= L'Z')
*dst++ = *wsrc;
if ((dst - cp) < 3)
{
/* In non-english Windows, converted tz.StandardName
may not contain a valid standard timezone name. */
strcpy (cp, wildabbr);
cp += strlen (wildabbr);
}
else
cp = dst;
d = div (tzi.Bias + tzi.StandardBias, 60);
__small_sprintf (cp, "%d", d.quot);
if (d.rem)
__small_sprintf (cp = strchr (cp, 0), ":%d", abs (d.rem));
if (tzi.StandardDate.wMonth)
{
cp = strchr (cp, 0);
dst = cp;
for (wsrc = tzi.DaylightName; *wsrc; wsrc++)
if (*wsrc >= L'A' && *wsrc <= L'Z')
*dst++ = *wsrc;
if ((dst - cp) < 3)
{
/* In non-english Windows, converted tz.DaylightName
may not contain a valid daylight timezone name. */
strcpy (cp, wildabbr);
cp += strlen (wildabbr);
}
else
cp = dst;
d = div (tzi.Bias + tzi.DaylightBias, 60);
__small_sprintf (cp, "%d", d.quot);
if (d.rem)
__small_sprintf (cp = strchr (cp, 0), ":%d", abs (d.rem));
cp = strchr (cp, 0);
__small_sprintf (cp = strchr (cp, 0), ",M%d.%d.%d/%d",
tzi.DaylightDate.wMonth,
tzi.DaylightDate.wDay,
tzi.DaylightDate.wDayOfWeek,
tzi.DaylightDate.wHour);
if (tzi.DaylightDate.wMinute || tzi.DaylightDate.wSecond)
__small_sprintf (cp = strchr (cp, 0), ":%d",
tzi.DaylightDate.wMinute);
if (tzi.DaylightDate.wSecond)
__small_sprintf (cp = strchr (cp, 0), ":%d",
tzi.DaylightDate.wSecond);
cp = strchr (cp, 0);
__small_sprintf (cp = strchr (cp, 0), ",M%d.%d.%d/%d",
tzi.StandardDate.wMonth,
tzi.StandardDate.wDay,
tzi.StandardDate.wDayOfWeek,
tzi.StandardDate.wHour);
if (tzi.StandardDate.wMinute || tzi.StandardDate.wSecond)
__small_sprintf (cp = strchr (cp, 0), ":%d",
tzi.StandardDate.wMinute);
if (tzi.StandardDate.wSecond)
__small_sprintf (cp = strchr (cp, 0), ":%d",
tzi.StandardDate.wSecond);
}
/* __small_printf ("TZ deduced as `%s'\n", outbuf); */
return outbuf;
}
// Pull these in early to catch any small issues before the real test
#include "private.h"
#include "tzfile.h"
/* Some NetBSD differences were too difficult to work around..
so #include a patched copy of localtime.c rather than the NetBSD original.
Here is a list of the patches...
(1) fix an erroneous decl of tzdirslash size (flagged by g++)
(2) add conditional call to Cygwin's tzgetwintzi() from tzsetlcl()
(3) add Cygwin's historical "posixrules" support to tzloadbody()
*/
#include "localtime.patched.c"
// Don't forget these Cygwin-specific additions from this point to EOF
EXPORT_ALIAS (tzset_unlocked, _tzset_unlocked)
long
__cygwin_gettzoffset (const struct tm *tmp)
{
#ifdef TM_GMTOFF
if (CYGWIN_VERSION_CHECK_FOR_EXTRA_TM_MEMBERS)
return tmp->TM_GMTOFF;
#endif /* defined TM_GMTOFF */
__tzinfo_type *tz = __gettzinfo ();
/* The sign of this is exactly opposite the envvar TZ. We
could directly use the global _timezone for tm_isdst==0,
but have to use __tzrule for daylight savings. */
long offset = -tz->__tzrule[tmp->tm_isdst > 0].offset;
return offset;
}
const char *
__cygwin_gettzname (const struct tm *tmp)
{
#ifdef TM_ZONE
if (CYGWIN_VERSION_CHECK_FOR_EXTRA_TM_MEMBERS)
return tmp->TM_ZONE;
#endif
return _tzname[tmp->tm_isdst > 0];
}
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