initial import of NetBSD tree

1 files changed, 140 insertions, 0 deletions

diff --git a/lib/libc/gen/timezone.c b/lib/libc/gen/timezone.c
new file mode 100644
index 00000000000..02fb353023f
--- /dev/null
+++ b/lib/libc/gen/timezone.c
@@ -0,0 +1,140 @@
+/*	$NetBSD: timezone.c,v 1.5 1995/02/27 05:54:24 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)timezone.c	8.1 (Berkeley) 6/4/93";
+#else
+static char rcsid[] = "$NetBSD: timezone.c,v 1.5 1995/02/27 05:54:24 cgd Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <tzfile.h>
+
+char *_tztab();
+
+/*
+ * timezone --
+ *	The arguments are the number of minutes of time you are westward
+ *	from Greenwich and whether DST is in effect.  It returns a string
+ *	giving the name of the local timezone.  Should be replaced, in the
+ *	application code, by a call to localtime.
+ */
+
+static char	czone[TZ_MAX_CHARS];		/* space for zone name */
+
+char *
+timezone(zone, dst)
+	int	zone,
+		dst;
+{
+	register char	*beg,
+			*end;
+
+	if (beg = getenv("TZNAME")) {		/* set in environment */
+		if (end = strchr(beg, ',')) {	/* "PST,PDT" */
+			if (dst)
+				return(++end);
+			*end = '\0';
+			(void)strncpy(czone,beg,sizeof(czone) - 1);
+			czone[sizeof(czone) - 1] = '\0';
+			*end = ',';
+			return(czone);
+		}
+		return(beg);
+	}
+	return(_tztab(zone,dst));	/* default: table or created zone */
+}
+
+static struct zone {
+	int	offset;
+	char	*stdzone;
+	char	*dlzone;
+} zonetab[] = {
+	-1*60,	"MET",	"MET DST",	/* Middle European */
+	-2*60,	"EET",	"EET DST",	/* Eastern European */
+	4*60,	"AST",	"ADT",		/* Atlantic */
+	5*60,	"EST",	"EDT",		/* Eastern */
+	6*60,	"CST",	"CDT",		/* Central */
+	7*60,	"MST",	"MDT",		/* Mountain */
+	8*60,	"PST",	"PDT",		/* Pacific */
+#ifdef notdef
+	/* there's no way to distinguish this from WET */
+	0,	"GMT",	0,		/* Greenwich */
+#endif
+	0*60,	"WET",	"WET DST",	/* Western European */
+	-10*60,	"EST",	"EST",		/* Aust: Eastern */
+     -10*60+30,	"CST",	"CST",		/* Aust: Central */
+	-8*60,	"WST",	0,		/* Aust: Western */
+	-1
+};
+
+/*
+ * _tztab --
+ *	check static tables or create a new zone name; broken out so that
+ *	we can make a guess as to what the zone is if the standard tables
+ *	aren't in place in /etc.  DO NOT USE THIS ROUTINE OUTSIDE OF THE
+ *	STANDARD LIBRARY.
+ */
+char *
+_tztab(zone,dst)
+	register int	zone;
+	int	dst;
+{
+	register struct zone	*zp;
+	register char	sign;
+
+	for (zp = zonetab; zp->offset != -1;++zp)	/* static tables */
+		if (zp->offset == zone) {
+			if (dst && zp->dlzone)
+				return(zp->dlzone);
+			if (!dst && zp->stdzone)
+				return(zp->stdzone);
+		}
+
+	if (zone < 0) {					/* create one */
+		zone = -zone;
+		sign = '+';
+	}
+	else
+		sign = '-';
+	(void)sprintf(czone,"GMT%c%d:%02d",sign,zone / 60,zone % 60);
+	return(czone);
+}