2002-04-17 Jeff Johnston <jjohnstn@redhat.com>

        *  libc/include/time.h (tzset, _tzset_r): Added prototypes.
        (strptime): Moved prototype to be within !__STRICT_ANSI__.
        (_tzname, _daylight, _timezone): No long __CYGWIN__ only.
        (tzname): Defined for all platforms.
        (daylight, timezone): Defined only for CYGWIN.
        *  libc/sys/linux/machine/i386/crt0.c: Add call to tzset() after
        environment set up.
        * libc/stdlib/setenv_r.c (_setenv_r): Call tzset() if the TZ
        environment variable is set.
        *  libc/time/Makefile.am: Add support for tzset.c, tzlock.c, and
        tzset_r.c.
        *  libc/time/Makefile.in: Regenerated.
        *  libc/time/gmtime.c (gmtime): Changed to call gmtime_r.
        *  libc/time/gmtime_r.c (gmtime_r): Changed to call _mktm_r.
        *  libc/time/lcltime_r.c (lcltime_r): Ditto.
        *  libc/time/local.h: New local header file.
        *  libc/time/mktime.c (mktime): Add timezone support.
        *  libc/time/mktm_r.c: New file which is the common engine
        for gmtime_r and lcltime_r.  This code has timezone support.
        *  libc/time/strftime.c (strftime): Add %Z timezone support.
        *  libc/time/tzlock.c: New file containing timezone lock stubs.
        *  libc/time/tzset.c: New file containing tzset() routine.
        *  libc/time/tzset_r.c: New file containing _tzset_r and
        internal routine for calculating timezone changes for specified year.

1 files changed, 72 insertions, 0 deletions

diff --git a/newlib/libc/time/tzset.c b/newlib/libc/time/tzset.c
new file mode 100644
index 000000000..c70e3ee6e
--- /dev/null
+++ b/newlib/libc/time/tzset.c
@@ -0,0 +1,72 @@
+/*
+FUNCTION
+<<tzset>>---set timezone characteristics from TZ environment variable
+
+INDEX
+	tzset
+
+ANSI_SYNOPSIS
+	#include <time.h>
+	void tzset(void);
+	void _tzset_r (struct _reent *);
+
+TRAD_SYNOPSIS
+	#include <time.h>
+	void tzset();
+	void _tzset_r (reent_ptr)
+        struct _reent *reent_ptr;
+
+DESCRIPTION
+<<tzset>> examines the TZ environment variable and sets up the three
+external variables: <<_timezone>>, <<_daylight>>, and <<tzname>>.  The
+value of <<_timezone>> shall be the offset from the current time zone
+to GMT.  The value of <<_daylight>> shall be 0 if there is no daylight
+savings time for the current time zone, otherwise it will be non-zero.
+The <<tzname>> array has two entries: the first is the name of the
+standard time zone, the second is the name of the daylight-savings time
+zone.
+
+The TZ environment variable is expected to be in the following POSIX
+format:
+
+  stdoffset1[dst[offset2][,start[/time1],end[/time2]]]
+
+where: std is the name of the standard time-zone (minimum 3 chars)
+       offset1 is the value to add to local time to arrive at Universal time
+         it has the form:  hh[:mm[:ss]]
+       dst is the name of the alternate (daylight-savings) time-zone (min 3 chars)
+       offset2 is the value to add to local time to arrive at Universal time
+         it has the same format as the std offset
+       start is the day that the alternate time-zone starts
+       time1 is the optional time that the alternate time-zone starts
+         (this is in local time and defaults to 02:00:00 if not specified)
+       end is the day that the alternate time-zone ends
+       time2 is the time that the alternate time-zone ends
+         (it is in local time and defaults to 02:00:00 if not specified)
+
+Note that there is no white-space padding between fields.  Also note that
+if TZ is null, the default is Universal GMT which has no daylight-savings
+time.  If TZ is empty, the default EST5EDT is used.
+
+The function <<_tzset_r>> is identical to <<tzset>> only it is reentrant
+and is used for applications that use multiple threads.
+
+RETURNS
+There is no return value.
+
+PORTABILITY
+<<tzset>> is part of the POSIX standard.
+
+Supporting OS subroutine required: None
+*/
+
+#include <_ansi.h>
+#include <reent.h>
+#include <time.h>
+#include "local.h"
+
+_VOID
+_DEFUN_VOID (tzset)
+{
+  _tzset_r (_REENT);
+}