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	date.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	date.c (1961B)
	---
	1 #include <u.h>
	2 #include <stdlib.h> /* setenv etc. */
	3 #define NOPLAN9DEFINES
	4 #include <libc.h>
	5 #include <time.h>
	6
	7 #define _HAVETIMEGM 1
	8 #define _HAVETMZONE 1
	9 #define _HAVETMTZOFF 1
	10
	11 #if defined(__linux__)
	12 # undef _HAVETMZONE
	13 # undef _HAVETMTZOFF
	14
	15 #elif defined(__sun__)
	16 # undef _HAVETIMEGM
	17 # undef _HAVETMZONE
	18 # undef _HAVETMTZOFF
	19
	20 #endif
	21
	22 static Tm bigtm;
	23
	24 static void
	25 tm2Tm(struct tm tm, Tm bigtm)
	26 {
	27 char *s;
	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 strftime(bigtm->zone, sizeof bigtm->zone, "%Z", tm);
	38 #ifdef _HAVETZOFF
	39 bigtm->tzoff = tm->tm_gmtoff;
	40 #endif
	41
	42 if(bigtm->zone[0] == 0){
	43 s = getenv("TIMEZONE");
	44 if(s){
	45 strecpy(bigtm->zone, bigtm->zone+4, s);
	46 free(s);
	47 }
	48 }
	49 }
	50
	51 static void
	52 Tm2tm(Tm bigtm, struct tm tm)
	53 {
	54 memset(tm, 0, sizeof *tm);
	55 tm->tm_sec = bigtm->sec;
	56 tm->tm_min = bigtm->min;
	57 tm->tm_hour = bigtm->hour;
	58 tm->tm_mday = bigtm->mday;
	59 tm->tm_mon = bigtm->mon;
	60 tm->tm_year = bigtm->year;
	61 tm->tm_wday = bigtm->wday;
	62 #ifdef _HAVETMZONE
	63 tm->tm_zone = bigtm->zone;
	64 #endif
	65 #ifdef _HAVETZOFF
	66 tm->tm_gmtoff = bigtm->tzoff;
	67 #endif
	68 }
	69
	70 Tm*
	71 p9gmtime(long x)
	72 {
	73 time_t t;
	74 struct tm tm;
	75
	76 t = (time_t)x;
	77 tm = *gmtime(&t);
	78 tm2Tm(&tm, &bigtm);
	79 return &bigtm;
	80 }
	81
	82 Tm*
	83 p9localtime(long x)
	84 {
	85 time_t t;
	86 struct tm tm;
	87
	88 t = (time_t)x;
	89 tm = *localtime(&t);
	90 tm2Tm(&tm, &bigtm);
	91 return &bigtm;
	92 }
	93
	94 #if !defined(_HAVETIMEGM)
	95 static time_t
	96 timegm(struct tm *tm)
	97 {
	98 time_t ret;
	99 char *tz;
	100 char *s;
	101
	102 tz = getenv("TZ");
	103 putenv("TZ=");
	104 tzset();
	105 ret = mktime(tm);
	106 if(tz){
	107 s = smprint("TZ=%s", tz);
	108 if(s)
	109 putenv(s);
	110 }
	111 return ret;
	112 }
	113 #endif
	114
	115 long
	116 p9tm2sec(Tm *bigtm)
	117 {
	118 struct tm tm;
	119
	120 Tm2tm(bigtm, &tm);
	121 if(strcmp(bigtm->zone, "GMT") == 0 \|\| strcmp(bigtm->zone, "UCT")…
	122 return timegm(&tm);
	123 return mktime(&tm); /* local time zone */
	124 }
	125