Update.

1998-05-14 13:25  Ulrich Drepper  <drepper@cygnus.com>

	* inet/netinet/in.h: Add defines for multicast.
	Reported by Jeremy Hall <jhall@UU.NET>.

	* stdlib/stdlib.h: Add prototypes for __setenv and __unsetenv.
	* sysdeps/generic/putenv.c: Use __setenv and __unsetenv, not setenv
	and unsetenv.  Optimize _LIBC case.
	* sysdeps/generic/setenv.c: Prevent unnecessary memory leaks.
	Define functions with leading __.

	* time/tzfile.c: Correct handling of global variables daylight,
	timezone, and tzname.
	* time/tzset.c: Likewise.
	* timezone/Makefile (tests): Add tst-timezone.
	* timezone/tst-timezone.c: New file.

1998-05-14 10:35  Ulrich Drepper  <drepper@cygnus.com>

	* timezone/asia: Update from tzdata1998d.
	* timezone/australasia: Likewise.
	* timezone/europe: Likewise.

13 files changed, 324 insertions, 82 deletions

diff --git a/ChangeLog b/ChangeLog
index 0aee3ac595..0d22b9f6b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,26 @@
+1998-05-14 13:25  Ulrich Drepper  <drepper@cygnus.com>
+
+	* inet/netinet/in.h: Add defines for multicast.
+	Reported by Jeremy Hall <jhall@UU.NET>.
+
+	* stdlib/stdlib.h: Add prototypes for __setenv and __unsetenv.
+	* sysdeps/generic/putenv.c: Use __setenv and __unsetenv, not setenv
+	and unsetenv.  Optimize _LIBC case.
+	* sysdeps/generic/setenv.c: Prevent unnecessary memory leaks.
+	Define functions with leading __.
+
+	* time/tzfile.c: Correct handling of global variables daylight,
+	timezone, and tzname.
+	* time/tzset.c: Likewise.
+	* timezone/Makefile (tests): Add tst-timezone.
+	* timezone/tst-timezone.c: New file.
+
+1998-05-14 10:35  Ulrich Drepper  <drepper@cygnus.com>
+
+	* timezone/asia: Update from tzdata1998d.
+	* timezone/australasia: Likewise.
+	* timezone/europe: Likewise.
+
 1998-05-13  Ulrich Drepper  <drepper@cygnus.com>
 
 	* string/string.h: Don't use the optimized versions for the string
diff --git a/PROJECTS b/PROJECTS
index f1488d3e62..06242c70e0 100644
--- a/PROJECTS
+++ b/PROJECTS
@@ -1,6 +1,6 @@
 Open jobs for finishing GNU libc:
 ---------------------------------
-Status: April 1998
+Status: May 1998
 
 If you have time and talent to take over any of the jobs below please
 contact <bug-glibc@gnu.org>.
@@ -112,3 +112,25 @@ contact <bug-glibc@gnu.org>.
      correct form so it would be possible to enlarge it always according
      to the page size and install the correct length only for fclose() and
      fflush() calls.
+
+[17] The sprof program to analyze the profiling data generated by ld.so
+     must be finished.  It should have the same functionality as gprof
+     (as far as this is possible).
+
+[18] Based on the sprof program we need tools to analyze the output.  The
+     result should be a link map which specifies in which order the .o
+     files are placed in the shared object.  This should help to improve
+     code locality and result in a smaller foorprint (in code and data
+     memory) since less pages are only used in small parts.
+
+[19] A user-level STREAMS implementation should be available if the
+     kernel does not provide the support.
+
+[20] More conversion modules for iconv(3).  Existing modules should be
+     extended to do things like transliteration if this is wanted.
+     For often used conversion a direct conversion function should be
+     available.
+
+[21] The nscd program and the stubs in the libc should be changed so
+     that each program uses only one socket connect.  Take a look at
+	http://www.cygnus.com/~drepper/nscd.html
diff --git a/inet/netinet/in.h b/inet/netinet/in.h
index c6985ffa0a..ddc09753e2 100644
--- a/inet/netinet/in.h
+++ b/inet/netinet/in.h
@@ -143,6 +143,12 @@ struct in_addr
 # define INADDR_LOOPBACK	((uint32_t) 0x7f000001)	/* Inet 127.0.0.1.  */
 #endif
 
+/* Defines for Multicast INADDR.  */
+#define INADDR_UNSPEC_GROUP	((uint32_t) 0xe0000000)      /* 224.0.0.0 */
+#define INADDR_ALLHOSTS_GROUP	((uint32_t) 0xe0000001)      /* 224.0.0.1 */
+#define INADDR_ALLRTRS_GROUP    ((uint32_t) 0xe0000002)      /* 224.0.0.2 */
+#define INADDR_MAX_LOCAL_GROUP  ((uint32_t) 0xe00000ff)      /* 224.0.0.255 */
+
 
 /* IPv6 address */
 struct in6_addr
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index 757c252e87..b0703333d1 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -533,10 +533,13 @@ extern int putenv __P ((__const char *__string));
 #ifdef	__USE_BSD
 /* Set NAME to VALUE in the environment.
    If REPLACE is nonzero, overwrite an existing value.  */
+extern int __setenv __P ((__const char *__name, __const char *__value,
+			  int __replace));
 extern int setenv __P ((__const char *__name, __const char *__value,
 			int __replace));
 
 /* Remove the variable NAME from the environment.  */
+extern void __unsetenv __P ((__const char *__name));
 extern void unsetenv __P ((__const char *__name));
 #endif
 
diff --git a/sysdeps/generic/putenv.c b/sysdeps/generic/putenv.c
index 296f2847cf..d059c2f78c 100644
--- a/sysdeps/generic/putenv.c
+++ b/sysdeps/generic/putenv.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,7 +16,7 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
-#if defined (_AIX) && !defined (__GNUC__)
+#if defined _AIX && !defined __GNUC__
  #pragma alloca
 #endif
 
@@ -45,6 +45,9 @@
 extern char *alloca ();
 #  endif /* __GNUC__ */
 # endif /* HAVE_ALLOCA_H */
+
+# define setenv __setenv
+# define unsetenv __unsetenv
 #endif /* _LIBC */
 
 
@@ -57,10 +60,10 @@ putenv (string)
 
   if (name_end != NULL)
     {
-      char *name = alloca (name_end - string + 1);
 #ifdef _LIBC
-      *((char *) __mempcpy (name, string, name_end - string)) = '\0';
+      char *name = strndupa (string, name_end - string);
 #else
+      char *name = alloca (name_end - string + 1);
       memcpy (name, string, name_end - string);
       name[name_end - string] = '\0';
 #endif
diff --git a/sysdeps/generic/setenv.c b/sysdeps/generic/setenv.c
index d4c5c87b15..69bd992832 100644
--- a/sysdeps/generic/setenv.c
+++ b/sysdeps/generic/setenv.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1992, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,7 +22,7 @@
 
 #include <errno.h>
 #if !_LIBC
-# if !defined(errno) && !defined(HAVE_ERRNO_DECL)
+# if !defined errno && !defined HAVE_ERRNO_DECL
 extern int errno;
 # endif
 # define __set_errno(ev) ((errno) = (ev))
@@ -58,9 +58,34 @@ __libc_lock_define_initialized (static, envlock)
 
 /* In the GNU C library we must keep the namespace clean.  */
 #ifdef _LIBC
+# define setenv __setenv
+# define unsetenv __unsetenv
 # define clearenv __clearenv
 #endif
 
+/* In the GNU C library implementation we try to be more clever and
+   allow arbitrary many changes of the environment given that the used
+   values are from a small set.  Outside glibc this will eat up all
+   memory after a while.  */
+#if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH)
+# define USE_TSEARCH	1
+# include <search.h>
+
+/* This is a pointer to the root of the search tree with the known
+   values.  */
+static void *known_values;
+
+# define KNOWN_VALUE(Str) tfind (Str, &known_values, (__compar_fn_t) strcmp)
+# define STORE_VALUE(Str) tsearch (Str, &known_values, (__compar_fn_t) strcmp)
+
+#else
+# undef USE_TSEARCH
+
+# define KNOWN_VALUE(Str) NULL
+# define STORE_VALUE(Str) do { } while (0)
+
+#endif
+
 
 /* If this variable is not a null pointer we allocated the current
    environment.  */
@@ -91,45 +116,56 @@ setenv (name, value, replace)
   if (__environ == NULL || *ep == NULL)
     {
       char **new_environ;
+#ifdef USE_TSEARCH
+      char *new_value;
+#endif
 
-      if (__environ == last_environ && __environ != NULL)
-	/* We allocated this space; we can extend it.  */
-	new_environ = (char **) realloc (last_environ,
-					 (size + 2) * sizeof (char *));
-      else
-	new_environ = (char **) malloc ((size + 2) * sizeof (char *));
-
+      /* We allocated this space; we can extend it.  */
+      new_environ = (char **) realloc (last_environ,
+				       (size + 2) * sizeof (char *));
       if (new_environ == NULL)
 	{
 	  UNLOCK;
 	  return -1;
 	}
 
-      new_environ[size] = malloc (namelen + 1 + vallen);
+      /* See whether the value is already known.  */
+#ifdef USE_TSEARCH
+      new_value = alloca (namelen + 1 + vallen);
+# ifdef _LIBC
+      __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
+		 value, vallen);
+# else
+      memcpy (new_value, name, namelen);
+      new_value[namelen] = '=';
+      memcpy (&new_value[namelen + 1], value, vallen);
+# endif
+
+      new_environ[size] = KNOWN_VALUE (new_value);
       if (new_environ[size] == NULL)
+#endif
 	{
-	  free ((char *) new_environ);
-	  __set_errno (ENOMEM);
-	  UNLOCK;
-	  return -1;
+	  new_environ[size] = malloc (namelen + 1 + vallen);
+	  if (new_environ[size] == NULL)
+	    {
+	      __set_errno (ENOMEM);
+	      UNLOCK;
+	      return -1;
+	    }
+
+#ifdef USE_TSEARCH
+	  memcpy (new_environ[size], new_value, namelen + 1 + vallen);
+#else
+	  memcpy (new_environ[size], name, namelen);
+	  new_environ[size][namelen] = '=';
+	  memcpy (&new_environ[size][namelen + 1], value, vallen);
+#endif
 	}
 
       if (__environ != last_environ)
 	memcpy ((char *) new_environ, (char *) __environ,
 		size * sizeof (char *));
 
-#ifdef _LIBC
-      {
-	char *tmp = __mempcpy (new_environ[size], name, namelen);
-	*tmp++ = '=';
-	__mempcpy (tmp, value, vallen);
-      }
-#else
-      memcpy (new_environ[size], name, namelen);
-      new_environ[size][namelen] = '=';
-      memcpy (&new_environ[size][namelen + 1], value, vallen);
-#endif
-
       new_environ[size + 1] = NULL;
 
       last_environ = __environ = new_environ;
@@ -139,22 +175,48 @@ setenv (name, value, replace)
       size_t len = strlen (*ep);
       if (len + 1 < namelen + 1 + vallen)
 	{
+	  char *new_value;
+	  char *np;
+
 	  /* The existing string is too short; malloc a new one.  */
-	  char *new = malloc (namelen + 1 + vallen);
-	  if (new == NULL)
+#ifdef USE_TSEARCH
+	  new_value = alloca (namelen + 1 + vallen);
+# ifdef _LIBC
+	  __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
+		     value, vallen);
+# else
+	  memcpy (new_value, name, namelen);
+	  new_value[namelen] = '=';
+	  memcpy (&new_value[namelen + 1], value, vallen);
+# endif
+
+	  np = KNOWN_VALUE (new_value);
+	  if (np == NULL)
+#endif
 	    {
-	      UNLOCK;
-	      return -1;
-	    }
-	  *ep = new;
-#ifdef _LIBC
-	  *((char *) __mempcpy (*ep, name, namelen)) = '=';
+	      np = malloc (namelen + 1 + vallen);
+	      if (np == NULL)
+		{
+		  UNLOCK;
+		  return -1;
+		}
+
+#ifdef USE_TSEARCH
+	      memcpy (np, new_value, namelen + 1 + vallen);
 #else
-	  memcpy (*ep, name, namelen);
-	  (*ep)[namelen] = '=';
+	      memcpy (np, name, namelen);
+	      np[namelen] = '=';
+	      memcpy (&np[namelen + 1], value, vallen);
 #endif
+	    }
+
+	  /* Keep the old value around.  */
+	  STORE_VALUE (*ep);
+	  *ep = np;
 	}
-      memcpy (&(*ep)[namelen + 1], value, vallen);
+      else
+	/* Overwrite the value part of the old value.  */
+	memcpy (&(*ep)[namelen + 1], value, vallen);
     }
 
   UNLOCK;
@@ -171,11 +233,15 @@ unsetenv (name)
 
   LOCK;
 
-  for (ep = __environ; *ep; ++ep)
+  for (ep = __environ; *ep != NULL; ++ep)
     if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
       {
 	/* Found it.  Remove this pointer by moving later ones back.  */
 	char **dp = ep;
+
+	/* Store the value so that we can reuse it later.  */
+	STORE_VALUE (ep);
+
 	do
 	  dp[0] = dp[1];
 	while (*dp++);
@@ -195,7 +261,12 @@ clearenv ()
 
   if (__environ == last_environ && __environ != NULL)
     {
-      /* We allocated this environment so we can free it.  */
+      /* We allocated this environment so we can free it.  Store all the
+         strings.  */
+      char **ep = __environ;
+      while (*ep != NULL)
+	STORE_VALUE (*ep++);
+
       free (__environ);
       last_environ = NULL;
     }
@@ -208,6 +279,10 @@ clearenv ()
   return 0;
 }
 #ifdef _LIBC
+# undef setenv
+# undef unsetenv
 # undef clearenv
+weak_alias (__setenv, setenv)
+weak_alias (__unsetenv, unsetenv)
 weak_alias (__clearenv, clearenv)
 #endif
diff --git a/time/tzfile.c b/time/tzfile.c
index 7dcf88dbe9..c9becf3238 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -54,6 +54,8 @@ static unsigned char *type_idxs = NULL;
 static size_t num_types;
 static struct ttinfo *types = NULL;
 static char *zone_names = NULL;
+static long int rule_stdoff;
+static long int rule_dstoff;
 static size_t num_leaps;
 static struct leap *leaps = NULL;
 
@@ -266,15 +268,32 @@ __tzfile_read (const char *file)
 
   fclose (f);
 
-  info = find_transition (0);
+  /* Find the standard and daylight time offsets used by the rule file.
+     We choose the offsets in the types of each flavor that are
+     transitioned to earliest in time.  */
+  __tzname[1] = NULL;
   for (i = 0; i < num_types && i < sizeof (__tzname) / sizeof (__tzname[0]);
        ++i)
     __tzname[types[i].isdst] = __tzstring (&zone_names[types[i].idx]);
-  if (info->isdst < sizeof (__tzname) / sizeof (__tzname[0]))
-    __tzname[info->isdst] = __tzstring (&zone_names[info->idx]);
+  if (__tzname[1] == NULL)
+    __tzname[1] = __tzname[0];
 
   compute_tzname_max (chars);
 
+  rule_stdoff = rule_dstoff = 0;
+  for (i = 0; i < num_transitions; ++i)
+    {
+      if (!rule_stdoff && !types[type_idxs[i]].isdst)
+	rule_stdoff = types[type_idxs[i]].offset;
+      if (!rule_dstoff && types[type_idxs[i]].isdst)
+	rule_dstoff = types[type_idxs[i]].offset;
+      if (rule_stdoff && rule_dstoff)
+	break;
+    }
+
+  __daylight = rule_stdoff != rule_dstoff;
+  __timezone = -rule_stdoff;
+
   __use_tzfile = 1;
   return;
 
@@ -291,7 +310,6 @@ __tzfile_default (const char *std, const char *dst,
 		  long int stdoff, long int dstoff)
 {
   size_t stdlen, dstlen, i;
-  long int rule_offset, rule_stdoff, rule_dstoff;
   int isdst;
 
   __tzfile_read (TZDEFRULES);
@@ -318,24 +336,9 @@ __tzfile_default (const char *std, const char *dst,
     }
   __mempcpy (__mempcpy (zone_names, std, stdlen), dst, dstlen);
 
-  /* Find the standard and daylight time offsets used by the rule file.
-     We choose the offsets in the types of each flavor that are
-     transitioned to earliest in time.  */
-  rule_stdoff = rule_dstoff = 0;
-  for (i = 0; i < num_transitions; ++i)
-    {
-      if (!rule_stdoff && !types[type_idxs[i]].isdst)
-	rule_stdoff = types[type_idxs[i]].offset;
-      if (!rule_dstoff && types[type_idxs[i]].isdst)
-	rule_dstoff = types[type_idxs[i]].offset;
-      if (rule_stdoff && rule_dstoff)
-	break;
-    }
-
   /* Now correct the transition times for the user-specified standard and
      daylight offsets from GMT.  */
   isdst = 0;
-  rule_offset = rule_offset;
   for (i = 0; i < num_transitions; ++i)
     {
       struct ttinfo *trans_type = &types[type_idxs[i]];
@@ -419,14 +422,16 @@ __tzfile_compute (time_t timer, int use_localtime,
   if (use_localtime)
     {
       struct ttinfo *info = find_transition (timer);
-      __daylight = info->isdst;
-      __timezone = -info->offset;
+      __daylight = rule_stdoff != rule_dstoff;
+      __timezone = -rule_stdoff;
+      __tzname[1] = NULL;
       for (i = 0;
 	   i < num_types && i < sizeof (__tzname) / sizeof (__tzname[0]);
 	   ++i)
 	__tzname[types[i].isdst] = &zone_names[types[i].idx];
-      if (info->isdst < sizeof (__tzname) / sizeof (__tzname[0]))
-	__tzname[info->isdst] = &zone_names[info->idx];
+      if (__tzname[1] == NULL)
+	/* There is no daylight saving time.  */
+	__tzname[1] = __tzname[0];
     }
 
   *leap_correct = 0L;
diff --git a/time/tzset.c b/time/tzset.c
index e766796513..e42be39db8 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -333,6 +333,7 @@ tzset_internal (always)
     {
       /* There is no DST.  */
       tz_rules[1].name = tz_rules[0].name;
+      tz_rules[1].offset = tz_rules[0].offset;
       free (tzbuf);
       return;
     }
@@ -547,8 +548,8 @@ tz_compute (timer, tm)
       ! compute_change (&tz_rules[1], 1900 + tm->tm_year))
     return 0;
 
-  __daylight = timer >= tz_rules[0].change && timer < tz_rules[1].change;
-  __timezone = -tz_rules[__daylight].offset;
+  __daylight = tz_rules[0].offset != tz_rules[1].offset;
+  __timezone = -tz_rules[0].offset;
   __tzname[0] = (char *) tz_rules[0].name;
   __tzname[1] = (char *) tz_rules[1].name;
 
@@ -626,9 +627,10 @@ __tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
     {
       if (use_localtime)
 	{
-	  tp->tm_isdst = __daylight;
-	  tp->tm_zone = __tzname[__daylight];
-	  tp->tm_gmtoff = -__timezone;
+	  tp->tm_isdst = (*timer >= tz_rules[0].change
+			  && *timer < tz_rules[1].change);
+	  tp->tm_zone = __tzname[tp->tm_isdst];
+	  tp->tm_gmtoff = tz_rules[tp->tm_isdst].offset;
 	}
       else
 	{
diff --git a/timezone/Makefile b/timezone/Makefile
index 9b436e17ff..1b26d1ab4d 100644
--- a/timezone/Makefile
+++ b/timezone/Makefile
@@ -28,7 +28,7 @@ distribute := tzfile.h private.h scheck.c ialloc.c yearistype	\
 extra-objs := scheck.o ialloc.o
 
 others	:= zdump zic
-tests	:= test-tz
+tests	:= test-tz tst-timezone
 
 tzbases := africa antarctica asia australasia europe northamerica \
 	   southamerica etcetera factory systemv \
diff --git a/timezone/asia b/timezone/asia
index de1a379846..8d667cc99e 100644
--- a/timezone/asia
+++ b/timezone/asia
@@ -1,4 +1,4 @@
-# @(#)asia	7.36
+# @(#)asia	7.38
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
@@ -507,7 +507,7 @@ Rule	Zion	1988	only	-	Apr	 9	0:00	1:00	D
 Rule	Zion	1988	only	-	Sep	 3	0:00	0	S
 
 # From Ephraim Silverberg <ephraim@cs.huji.ac.il>
-# (1997-03-04 and 1997-12-31):
+# (1997-03-04 and 1998-03-16):
 
 # According to the Office of the Secretary General of the Ministry of
 # Interior, there is NO set rule for Daylight-Savings/Standard time changes.
@@ -557,9 +557,9 @@ Rule	Zion	1995	only	-	Sep	 3	0:00	0	S
 #
 #   ftp://ftp.huji.ac.il/pub/tz/announcements/1997.ps.gz
 #
-# According to the Office of the Spokeswoman for the Ministry of Interior,
-# the dates for 1998 are tentative and are still subject to final approval
-# (probably in late February/early March of 1998).
+# The official announcement for the year 1998 can be viewed at:
+#
+#   ftp://ftp.huji.ac.il/pub/tz/announcements/1998.ps.gz
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	1996	only	-	Mar	15	0:00	1:00	D
@@ -780,7 +780,6 @@ Zone	Indian/Maldives	4:54:00 -	LMT	1880	# Male
 
 # Mongolia
 # Shanks says that Mongolia has three time zones, but usno1995 and the CIA map
-# <a href="http://www.odci.gov/cia/publications/nsolo/rmap-pdf/802483.pdf">
 # Standard Time Zones of the World (1997-01)
 # </a>
 # both say that it has just one.
diff --git a/timezone/australasia b/timezone/australasia
index 2bb3a0a771..810c10d618 100644
--- a/timezone/australasia
+++ b/timezone/australasia
@@ -1,4 +1,4 @@
-# @(#)australasia	7.40
+# @(#)australasia	7.41
 # This file also includes Pacific islands.
 
 # Notes are at the end of this file
@@ -804,7 +804,7 @@ Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 # # YANCOWINNA..  [ Confirmation courtesy of Broken Hill Postmaster ]
 # #					[ Dec 1990 ]
 # ...
-# # Yancowinna uses Central Standard Time, despite it's location on the
+# # Yancowinna uses Central Standard Time, despite [its] location on the
 # # New South Wales side of the S.A. border. Most business and social dealings
 # # are with CST zones, therefore CST is legislated by local government
 # # although the switch to Summer Time occurs in line with N.S.W. There have
diff --git a/timezone/europe b/timezone/europe
index 0df00f3a69..0f2398f677 100644
--- a/timezone/europe
+++ b/timezone/europe
@@ -1,4 +1,4 @@
-# @(#)europe	7.53
+# %W%
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
diff --git a/timezone/tst-timezone.c b/timezone/tst-timezone.c
new file mode 100644
index 0000000000..49b3621128
--- /dev/null
+++ b/timezone/tst-timezone.c
@@ -0,0 +1,104 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int failed = 0;
+
+struct test_times
+{
+  const char *name;
+  int daylight;
+  int timezone;
+};
+
+static const struct test_times tests[] =
+{
+  { "Europe/Berlin", 1, -3600 },
+  { "Universal", 0, 0 },
+  { "Australia/Melbourne", 1, -36000 },
+  { "America/Sao_Paulo", 1, 10800 },
+  { NULL, 0, 0 }
+};
+
+
+void
+print_tzvars (void)
+{
+  printf ("tzname[0]: %s\n", tzname[0]);
+  printf ("tzname[1]: %s\n", tzname[1]);
+  printf ("daylight: %d\n", daylight);
+  printf ("timezone: %ld\n", timezone);
+}
+
+
+void
+check_tzvars (const char *name, int dayl, int timez)
+{
+  if (daylight != dayl)
+    {
+      printf ("Timezone: %s, daylight is: %d but should be: %d\n",
+	      name, daylight, dayl);
+      ++failed;
+    }
+  if (timezone != timez)
+    {
+      printf ("Timezone: %s, timezone is: %ld but should be: %d\n",
+	      name, timezone, timez);
+      ++failed;
+    }
+}
+
+
+int
+main (int argc, char ** argv)
+{
+  time_t t;
+  const struct test_times *pt;
+  char buf[BUFSIZ];
+
+  /* This should be: Thu May 14 18:02:16 1998.  */
+  t = 895194136;
+  printf ("We use this date: %s\n", ctime (&t));
+
+  for (pt = tests; pt->name != NULL; ++pt)
+    {
+      /* Start with a known state */
+      printf ("Checking timezone %s\n", pt->name);
+      sprintf (buf, "TZ=%s", pt->name);
+      if (putenv (buf))
+	{
+	  puts ("putenv failed.");
+	  failed = 1;
+	}
+      tzset ();
+      print_tzvars ();
+      check_tzvars (pt->name, pt->daylight, pt->timezone);
+
+      /* calling localtime shouldn't make a difference */
+      localtime (&t);
+      print_tzvars ();
+      check_tzvars (pt->name, pt->daylight, pt->timezone);
+    }
+
+  return failed ? EXIT_FAILURE : EXIT_SUCCESS;
+}