Add Olson's public domain timezone library to src/timezone.

Author: bmomjian

src/timezone/Makefile

@@ -0,0 +1,33 @@
+#-------------------------------------------------------------------------
+#
+# Makefile--
+#    Makefile for the timezone library
+
+# IDENTIFICATION
+#    $PostgreSQL: pgsql/src/timezone/Makefile,v 1.1 2004/04/30 04:09:23 momjian Exp $
+#
+#-------------------------------------------------------------------------
+
+subdir = src/port/tz
+top_builddir = ../../..
+include $(top_builddir)/src/Makefile.global
+
+OBJS= asctime.o difftime.o localtime.o pgtz.o
+ZICOBJS= zic.o ialloc.o scheck.o localtime.o asctime.o pgtz.o ../path.o
+
+TZDATA := africa antarctica asia australasia europe northamerica southamerica pacificnew etcetera factory backward systemv solar87 solar88 solar89
+TZDATAFILES := $(TZDATA:%=data/%)
+
+all: SUBSYS.o zic
+
+SUBSYS.o: $(OBJS)
+	$(LD) $(LDREL) $(LDOUT) SUBSYS.o $(OBJS)
+
+
+zic: $(ZICOBJS)
+
+install: zic
+	zic -d $(datadir)/timezone $(TZDATAFILES)
+
+clean distclean maintainer-clean:
+	rm -f SUBSYS.o $(OBJS) $(ZICOBJS)

src/timezone/README

@@ -0,0 +1,17 @@
+This is a PostgreSQL adapted version of the timezone library
+from:
+ftp://elsie.nci.nih.gov/pub/tz*.tar.gz
+
+
+The interface is used when USE_PGTZ is defined at the top level. This
+will cause the following functions to be redefined:
+  localtime		pg_localtime
+  gmtime		pg_gmtime
+  asctime		pg_asctime
+  ctime			pg_ctime
+  difftime		pg_difftime
+  mktime		pg_mktime
+  tzset			pg_tzset
+
+and the TIMEZONE_GLOBAL define in c.h is redefined to pg_timezone.
+

src/timezone/asctime.c

@@ -0,0 +1,74 @@
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
+*/
+
+#ifndef lint
+#ifndef NOID
+static char	elsieid[] = "@(#)asctime.c	7.9";
+#endif /* !defined NOID */
+#endif /* !defined lint */
+
+/*LINTLIBRARY*/
+
+#include "private.h"
+#include "tzfile.h"
+
+/*
+** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, Second Edition, 1996-07-12.
+*/
+
+char *
+asctime_r(timeptr, buf)
+register const struct tm *	timeptr;
+char *				buf;
+{
+	static const char	wday_name[][3] = {
+		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+	};
+	static const char	mon_name[][3] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	};
+	register const char *	wn;
+	register const char *	mn;
+
+	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
+		wn = "???";
+	else	wn = wday_name[timeptr->tm_wday];
+	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
+		mn = "???";
+	else	mn = mon_name[timeptr->tm_mon];
+	/*
+	** The X3J11-suggested format is
+	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
+	** Since the .2 in 02.2d is ignored, we drop it.
+	*/
+	(void) sprintf(buf, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
+		wn, mn,
+		timeptr->tm_mday, timeptr->tm_hour,
+		timeptr->tm_min, timeptr->tm_sec,
+		TM_YEAR_BASE + timeptr->tm_year);
+	return buf;
+}
+
+/*
+** A la X3J11, with core dump avoidance.
+*/
+
+char *
+asctime(timeptr)
+register const struct tm *	timeptr;
+{
+	/*
+	** Big enough for something such as
+	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
+	** (two three-character abbreviations, five strings denoting integers,
+	** three explicit spaces, two explicit colons, a newline,
+	** and a trailing ASCII nul).
+	*/
+	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
+					3 + 2 + 1 + 1];
+
+	return asctime_r(timeptr, result);
+}