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8168e750 WJ |
1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)timezone.c 5.10 (Berkeley) 2/23/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/types.h> | |
39 | #include <sys/time.h> | |
40 | #include <stdio.h> | |
41 | #include <stdlib.h> | |
42 | #include <string.h> | |
43 | #include <tzfile.h> | |
44 | ||
45 | char *_tztab(); | |
46 | ||
47 | /* | |
48 | * timezone -- | |
49 | * The arguments are the number of minutes of time you are westward | |
50 | * from Greenwich and whether DST is in effect. It returns a string | |
51 | * giving the name of the local timezone. Should be replaced, in the | |
52 | * application code, by a call to localtime. | |
53 | */ | |
54 | ||
55 | static char czone[TZ_MAX_CHARS]; /* space for zone name */ | |
56 | ||
57 | char * | |
58 | timezone(zone, dst) | |
59 | int zone, | |
60 | dst; | |
61 | { | |
62 | register char *beg, | |
63 | *end; | |
64 | ||
65 | if (beg = getenv("TZNAME")) { /* set in environment */ | |
66 | if (end = index(beg, ',')) { /* "PST,PDT" */ | |
67 | if (dst) | |
68 | return(++end); | |
69 | *end = '\0'; | |
70 | (void)strncpy(czone,beg,sizeof(czone) - 1); | |
71 | czone[sizeof(czone) - 1] = '\0'; | |
72 | *end = ','; | |
73 | return(czone); | |
74 | } | |
75 | return(beg); | |
76 | } | |
77 | return(_tztab(zone,dst)); /* default: table or created zone */ | |
78 | } | |
79 | ||
80 | static struct zone { | |
81 | int offset; | |
82 | char *stdzone; | |
83 | char *dlzone; | |
84 | } zonetab[] = { | |
85 | -1*60, "MET", "MET DST", /* Middle European */ | |
86 | -2*60, "EET", "EET DST", /* Eastern European */ | |
87 | 4*60, "AST", "ADT", /* Atlantic */ | |
88 | 5*60, "EST", "EDT", /* Eastern */ | |
89 | 6*60, "CST", "CDT", /* Central */ | |
90 | 7*60, "MST", "MDT", /* Mountain */ | |
91 | 8*60, "PST", "PDT", /* Pacific */ | |
92 | #ifdef notdef | |
93 | /* there's no way to distinguish this from WET */ | |
94 | 0, "GMT", 0, /* Greenwich */ | |
95 | #endif | |
96 | 0*60, "WET", "WET DST", /* Western European */ | |
97 | -10*60, "EST", "EST", /* Aust: Eastern */ | |
98 | -10*60+30, "CST", "CST", /* Aust: Central */ | |
99 | -8*60, "WST", 0, /* Aust: Western */ | |
100 | -1 | |
101 | }; | |
102 | ||
103 | /* | |
104 | * _tztab -- | |
105 | * check static tables or create a new zone name; broken out so that | |
106 | * we can make a guess as to what the zone is if the standard tables | |
107 | * aren't in place in /etc. DO NOT USE THIS ROUTINE OUTSIDE OF THE | |
108 | * STANDARD LIBRARY. | |
109 | */ | |
110 | char * | |
111 | _tztab(zone,dst) | |
112 | register int zone; | |
113 | int dst; | |
114 | { | |
115 | register struct zone *zp; | |
116 | register char sign; | |
117 | ||
118 | for (zp = zonetab; zp->offset != -1;++zp) /* static tables */ | |
119 | if (zp->offset == zone) { | |
120 | if (dst && zp->dlzone) | |
121 | return(zp->dlzone); | |
122 | if (!dst && zp->stdzone) | |
123 | return(zp->stdzone); | |
124 | } | |
125 | ||
126 | if (zone < 0) { /* create one */ | |
127 | zone = -zone; | |
128 | sign = '+'; | |
129 | } | |
130 | else | |
131 | sign = '-'; | |
132 | (void)sprintf(czone,"GMT%c%d:%02d",sign,zone / 60,zone % 60); | |
133 | return(czone); | |
134 | } |