1 #define NOPLAN9DEFINES
2 #include <u.h>
3 #include <libc.h>
4 #include <stdlib.h> /* setenv etc. */
5 #include <time.h>
6 
7 static int
8 dotz(time_t t, char *tzone)
9 {
10 	struct tm *gtm;
11 	struct tm tm;
12 
13 	strftime(tzone, 32, "%Z", localtime(&t));
14 	tm = *localtime(&t);	/* set local time zone field */
15 	gtm = gmtime(&t);
16 	tm.tm_sec = gtm->tm_sec;
17 	tm.tm_min = gtm->tm_min;
18 	tm.tm_hour = gtm->tm_hour;
19 	tm.tm_mday = gtm->tm_mday;
20 	tm.tm_mon = gtm->tm_mon;
21 	tm.tm_year = gtm->tm_year;
22 	tm.tm_wday = gtm->tm_wday;
23 	return t - mktime(&tm);
24 }
25 
26 static void
27 tm2Tm(struct tm *tm, Tm *bigtm, int tzoff, char *zone)
28 {
29 	memset(bigtm, 0, sizeof *bigtm);
30 	bigtm->sec = tm->tm_sec;
31 	bigtm->min = tm->tm_min;
32 	bigtm->hour = tm->tm_hour;
33 	bigtm->mday = tm->tm_mday;
34 	bigtm->mon = tm->tm_mon;
35 	bigtm->year = tm->tm_year;
36 	bigtm->wday = tm->tm_wday;
37 	bigtm->tzoff = tzoff;
38 	strncpy(bigtm->zone, zone, 3);
39 	bigtm->zone[3] = 0;
40 }
41 
42 static void
43 Tm2tm(Tm *bigtm, struct tm *tm)
44 {
45 	/* initialize with current time to get local time zone! (tm_isdst) */
46 	time_t t;
47 	time(&t);
48 	*tm = *localtime(&t);
49 
50 	tm->tm_sec = bigtm->sec;
51 	tm->tm_min = bigtm->min;
52 	tm->tm_hour = bigtm->hour;
53 	tm->tm_mday = bigtm->mday;
54 	tm->tm_mon = bigtm->mon;
55 	tm->tm_year = bigtm->year;
56 	tm->tm_wday = bigtm->wday;
57 }
58 
59 Tm*
60 p9gmtime(long x)
61 {
62 	time_t t;
63 	struct tm tm;
64 	static Tm bigtm;
65 	
66 	t = (time_t)x;
67 	tm = *gmtime(&t);
68 	tm2Tm(&tm, &bigtm, 0, "GMT");
69 	return &bigtm;
70 }
71 
72 Tm*
73 p9localtime(long x)
74 {
75 	time_t t;
76 	struct tm tm;
77 	static Tm bigtm;
78 	char tzone[32];
79 
80 	t = (time_t)x;
81 	tm = *localtime(&t);
82 	tm2Tm(&tm, &bigtm, dotz(t, tzone), tzone);
83 	return &bigtm;
84 }
85 
86 long
87 p9tm2sec(Tm *bigtm)
88 {
89 	time_t t;
90 	struct tm tm;
91 	char tzone[32];
92 
93 	Tm2tm(bigtm, &tm);
94 	t = mktime(&tm);
95 	if(strcmp(bigtm->zone, "GMT") == 0 || strcmp(bigtm->zone, "UCT") == 0){
96 		t += dotz(t, tzone);
97 	}
98 	return t;
99 }
100