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Add the timezone() built-in function.

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This commit is contained in:
Dianne Skoll
2022-10-05 16:28:38 -04:00
parent fba9f139ed
commit fac31a10b8
5 changed files with 117 additions and 0 deletions
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src/funcs.c
+44
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@@ -129,6 +129,7 @@ static int FSunrise (func_info *);
static int FSunset (func_info *);
static int FTime (func_info *);
static int FTimepart (func_info *);
static int FTimezone (func_info *);
static int FToday (func_info *);
static int FTrig (func_info *);
static int FTrigback (func_info *);
@@ -287,6 +288,7 @@ BuiltinFunc Func[] = {
{ "sunset", 0, 1, 0, FSunset },
{ "time", 2, 2, 1, FTime },
{ "timepart", 1, 1, 1, FTimepart },
{ "timezone", 0, 1, 1, FTimezone },
{ "today", 0, 0, 0, FToday },
{ "trig", 0, NO_MAX, 0, FTrig },
{ "trigback", 0, 0, 0, FTrigback },
@@ -2229,6 +2231,46 @@ static int FTimeStuff(int wantmins, func_info *info)
return OK;
}
static int FTimezone(func_info *info)
{
int yr, mon, day, hr, min, jul, now;
struct tm local, *withzone;
time_t t;
char buf[64];
if (Nargs == 0) {
jul = JulianToday;
now = (SystemTime(0) / 60);
} else {
if (!HASDATE(ARG(0))) return E_BAD_TYPE;
jul = DATEPART(ARG(0));
if (HASTIME(ARG(0))) {
now = TIMEPART(ARG(0));
} else {
now = 0;
}
}
FromJulian(jul, &yr, &mon, &day);
hr = now / 60;
min = now % 60;
memset(&local, 0, sizeof(local));
local.tm_sec = 0;
local.tm_min = min;
local.tm_hour = hr;
local.tm_mday = day;
local.tm_mon = mon;
local.tm_year = yr-1900;
local.tm_isdst = -1;
t = mktime(&local);
withzone = localtime(&t);
buf[0] = 0;
tzset();
strftime(buf, sizeof(buf), "%Z", withzone);
return RetStrVal(buf, info);
}
static int FLocalToUTC(func_info *info)
{
int yr, mon, day, hr, min, jul;
@@ -2241,6 +2283,7 @@ static int FLocalToUTC(func_info *info)
hr = TIMEPART(ARG(0))/60;
min = TIMEPART(ARG(0))%60;
memset(&local, 0, sizeof(local));
local.tm_sec = 0;
local.tm_min = min;
local.tm_hour = hr;
@@ -2277,6 +2320,7 @@ static int FUTCToLocal(func_info *info)
setenv("TZ", "UTC", 1);
tzset();
memset(&utc, 0, sizeof(utc));
utc.tm_sec = 0;
utc.tm_min = min;
utc.tm_hour = hr;