1 #include <stdlib.h> /* setenv etc. */
2 
3 #include <u.h>
4 #define NOPLAN9DEFINES
5 #include <libc.h>
6 #include <time.h>
7 
8 #define _HAVETIMEGM 1
9 #define _HAVETMZONE 1
10 #define _HAVETMTZOFF 1
11 
12 #if defined(__linux__)
13 #	undef _HAVETMZONE
14 #	undef _HAVETMTZOFF
15 
16 #elif defined(__sun__)
17 #	undef _HAVETIMEGM
18 #	undef _HAVETMZONE
19 #	undef _HAVETMTZOFF
20 
21 #endif
22 
23 static Tm bigtm;
24 
25 static void
26 tm2Tm(struct tm *tm, Tm *bigtm)
27 {
28 	memset(bigtm, 0, sizeof *bigtm);
29 	bigtm->sec = tm->tm_sec;
30 	bigtm->min = tm->tm_min;
31 	bigtm->hour = tm->tm_hour;
32 	bigtm->mday = tm->tm_mday;
33 	bigtm->mon = tm->tm_mon;
34 	bigtm->year = tm->tm_year;
35 	bigtm->wday = tm->tm_wday;
36 #ifdef _HAVETMZONE
37 	strecpy(bigtm->zone, bigtm->zone+4, tm->tm_zone);
38 #endif
39 #ifdef _HAVETZOFF
40 	bigtm->tzoff = tm->tm_gmtoff;
41 #endif
42 }
43 
44 static void
45 Tm2tm(Tm *bigtm, struct tm *tm)
46 {
47 	memset(tm, 0, sizeof *tm);
48 	tm->tm_sec = bigtm->sec;
49 	tm->tm_min = bigtm->min;
50 	tm->tm_hour = bigtm->hour;
51 	tm->tm_mday = bigtm->mday;
52 	tm->tm_mon = bigtm->mon;
53 	tm->tm_year = bigtm->year;
54 	tm->tm_wday = bigtm->wday;
55 #ifdef _HAVETMZONE
56 	tm->tm_zone = bigtm->zone;
57 #endif
58 #ifdef _HAVETZOFF
59 	tm->tm_gmtoff = bigtm->tzoff;
60 #endif
61 }
62 
63 Tm*
64 p9gmtime(long t)
65 {
66 	struct tm tm;
67 
68 	tm = *gmtime(&t);
69 	tm2Tm(&tm, &bigtm);
70 	return &bigtm;
71 }
72 
73 Tm*
74 p9localtime(long t)
75 {
76 	struct tm tm;
77 
78 	tm = *localtime(&t);
79 	tm2Tm(&tm, &bigtm);
80 	return &bigtm;
81 }
82 
83 #if !defined(_HAVETIMEGM)
84 static time_t
85 timegm(struct tm *tm)
86 {
87 	time_t ret;
88 	char *tz;
89 	char *s;
90 
91 	tz = getenv("TZ");
92 	putenv("TZ=");
93 	tzset();
94 	ret = mktime(tm);
95 	if(tz){
96 		s = smprint("TZ=%s", tz);
97 		if(s)
98 			putenv(s);
99 	}
100 	return ret;
101 }
102 #endif
103 
104 long
105 p9tm2sec(Tm *bigtm)
106 {
107 	struct tm tm;
108 
109 	Tm2tm(bigtm, &tm);
110 	if(strcmp(bigtm->zone, "GMT") == 0 || strcmp(bigtm->zone, "UCT") == 0)
111 		return timegm(&tm);
112 	return mktime(&tm);	/* local time zone */
113 }
114