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/*
* (c) The GRASP/AQUA Project, Glasgow University, 1994-1998
*
* $Id: timezone.h,v 1.9 1999/05/05 10:33:17 sof Exp $
*
* Time-zone support header
*/
#ifndef TIMEZONE_H
#define TIMEZONE_H
#define _OSF_SOURCE
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if linux_TARGET_OS
/* Sigh, RedHat 5 has the TM_ZONE stuff, but only when _BSD_SOURCE is
* on. The configure script erroneously says we've got TM_ZONE, so
* make sure we use the TZNAME stuff instead.
*
* Aside: tzname is POSIX, whereas tm_zone is BSD. We should be using
* tzname by preference, but the GNU configure stuff gives us HAVE_TM_ZONE
* in preference to HAVE_TZNAME. More sighs.
*/
# undef HAVE_TM_ZONE
# define HAVE_TZNAME 1
/* Double sigh. The timezone variable is only available under Linux
* when we're compiling NON_POSIX_SOURCE (or _GNU_SOURCE or whatever),
* but to make that work we have to make sure NON_POSIX_SOURCE is
* defined before anything from /usr/include is included. To avoid
* infecting too much source with NON_POSIX_SOURCE, we frob it
* below...
*/
#undef HAVE_TIMEZONE
/* The correct solution to this problem would appear to be to ditch
* the standard GNU configure tests for the time stuff, and hack up
* our own that test for POSIX-compliant time support first, then
* BSD-style time stuff.
*/
#endif
#ifdef solaris2_TARGET_OS
#undef HAVE_TIMEZONE
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_TM_ZONE
#define ZONE(x) (((struct tm *)x)->tm_zone)
#define SETZONE(x,z) (((struct tm *)x)->tm_zone = z)
#define GMTOFF(x) (((struct tm *)x)->tm_gmtoff)
#else /* ! HAVE_TM_ZONE */
# if HAVE_TZNAME || _WIN32
# if cygwin32_TARGET_OS
# define tzname _tzname
# endif
# ifndef mingw32_TARGET_OS
extern char *tzname[2];
# endif
# define ZONE(x) (((struct tm *)x)->tm_isdst ? tzname[1] : tzname[0])
# define SETZONE(x,z)
# else /* ! HAVE_TZNAME */
/* We're in trouble. If you should end up here, please report this as a bug. */
# error Dont know how to get at timezone name on your OS.
# endif /* ! HAVE_TZNAME */
/* Get the offset in secs from UTC, if (struct tm) doesn't supply it. */
#ifdef mingw32_TARGET_OS
#define timezone _timezone
#else
# ifdef cygwin32_TARGET_OS
# define timezone _timezone
# endif
#endif
#ifndef HAVE_TIMEZONE
extern TYPE_TIMEZONE timezone;
#endif
# if HAVE_ALTZONE
extern time_t altzone;
# define GMTOFF(x) (((struct tm *)x)->tm_isdst ? altzone : timezone )
# else /* ! HAVE_ALTZONE */
/* Assume that DST offset is 1 hour ... */
# define GMTOFF(x) (((struct tm *)x)->tm_isdst ? (timezone - 3600) : timezone )
# endif /* ! HAVE_ALTZONE */
#endif /* ! HAVE_TM_ZONE */
#endif /* TIMEZONE_H */
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