Libc-498.tar.gz

[apple/libc.git] / gen / timezone-fbsd.c

diff --git a/gen/timezone-fbsd.c b/gen/timezone-fbsd.c
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+/*
+ * 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)
+static char sccsid[] = "@(#)timezone.c 8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/gen/timezone.c,v 1.5 2002/02/01 01:08:48 obrien Exp $");
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define TZ_MAX_CHARS 255
+
+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;
+{
+       char    *beg,
+                       *end;
+
+       if ( (beg = getenv("TZNAME")) ) {       /* set in environment */
+               if ( (end = index(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)
+       int     zone;
+       int     dst;
+{
+       struct zone     *zp;
+       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)snprintf(czone, sizeof(czone),
+           "GMT%c%d:%02d",sign,zone / 60,zone % 60);
+       return(czone);
+}