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GTimeZone: Parse Windows format for TZ
Parse the "tzn[+|-]hh[:mm[:ss]][dzn]" format used in Windows for environment variable TZ. https://bugzilla.gnome.org/show_bug.cgi?id=683998
This commit is contained in:
Arnel A. Borja
John Ralls
parent
87436e6b3d
commit
206ba07bd9
265
glib/gtimezone.c
265
glib/gtimezone.c
@ -40,6 +40,11 @@
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#include "gdatetime.h"
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#include "gdate.h"
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#ifdef G_OS_WIN32
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#define STRICT
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#include <windows.h>
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#endif
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/**
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* SECTION:timezone
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* @title: GTimeZone
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@ -488,6 +493,221 @@ init_zone_from_iana_info (GTimeZone *gtz, GBytes *zoneinfo)
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g_bytes_unref (zoneinfo);
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}
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#elif defined (G_OS_WIN32)
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/* UTC = local time + bias while local time = UTC + offset */
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static void
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rule_from_windows_time_zone_info (TimeZoneRule *rules,
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LONG Bias,
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LONG StandardBias,
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LONG DaylightBias,
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SYSTEMTIME StandardDate,
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SYSTEMTIME DaylightDate)
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{
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/* Set offset */
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if (StandardDate.wMonth)
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{
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rules->std_offset = -(Bias + StandardBias) * 60;
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rules->dlt_offset = -(Bias + DaylightBias) * 60;
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rules->dlt_start.sec = DaylightDate.wSecond;
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rules->dlt_start.min = DaylightDate.wMinute;
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rules->dlt_start.hour = DaylightDate.wHour;
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rules->dlt_start.mon = DaylightDate.wMonth;
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rules->dlt_start.year = DaylightDate.wYear;
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rules->dlt_start.wday = DaylightDate.wDayOfWeek? DaylightDate.wDayOfWeek : 7;
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if (DaylightDate.wYear)
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{
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rules->dlt_start.mday = DaylightDate.wDay;
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rules->dlt_start.wday = 0;
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}
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else
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rules->dlt_start.week = DaylightDate.wDay;
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rules->dlt_start.isstd = FALSE;
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rules->dlt_start.isgmt = FALSE;
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rules->dlt_end.sec = StandardDate.wSecond;
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rules->dlt_end.min = StandardDate.wMinute;
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rules->dlt_end.hour = StandardDate.wHour;
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rules->dlt_end.mday = StandardDate.wDay;
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rules->dlt_end.mon = StandardDate.wMonth;
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rules->dlt_end.year = StandardDate.wYear;
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rules->dlt_end.wday = StandardDate.wDayOfWeek? StandardDate.wDayOfWeek : 7;
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if (StandardDate.wYear)
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{
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rules->dlt_end.mday = StandardDate.wDay;
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rules->dlt_end.wday = 0;
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}
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else
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rules->dlt_end.week = StandardDate.wDay;
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rules->dlt_end.isstd = FALSE;
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rules->dlt_end.isgmt = FALSE;
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}
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else
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{
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rules->std_offset = -Bias * 60;
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rules->dlt_start.mon = 0;
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}
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}
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static gboolean
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rules_from_windows_time_zone (const gchar *identifier,
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TimeZoneRule **rules,
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gint *rules_num,
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gchar **std_name,
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gchar **dlt_name)
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{
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HKEY key;
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gchar *subkey, *subkey_dynamic;
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gchar *key_name;
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/* REG_TZI_FORMAT */
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struct {
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LONG Bias;
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LONG StandardBias;
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LONG DaylightBias;
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SYSTEMTIME StandardDate;
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SYSTEMTIME DaylightDate;
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} tzi, tzi_prev;
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DWORD size;
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*rules = NULL;
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*rules_num = 0;
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*std_name = NULL;
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*dlt_name = NULL;
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key_name = NULL;
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if (!identifier)
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{
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subkey = "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation";
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if (RegOpenKeyExA (HKEY_LOCAL_MACHINE, subkey, 0,
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KEY_QUERY_VALUE, &key) == ERROR_SUCCESS)
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{
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size = 0;
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if (RegQueryValueExA (key, "TimeZoneKeyName", NULL, NULL,
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NULL, &size) == ERROR_SUCCESS)
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{
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key_name = g_malloc (size);
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if (RegQueryValueExA (key, "TimeZoneKeyName", NULL, NULL,
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(LPBYTE) key_name, &size) != ERROR_SUCCESS)
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{
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g_free (key_name);
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key_name = NULL;
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}
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}
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RegCloseKey (key);
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}
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}
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else
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key_name = g_strdup (identifier);
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if (!key_name)
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return FALSE;
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subkey = g_strconcat ("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\",
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key_name,
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NULL);
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subkey_dynamic = g_strconcat (subkey, "\\Dynamic DST", NULL);
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if (RegOpenKeyExA (HKEY_LOCAL_MACHINE, subkey_dynamic, 0,
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KEY_QUERY_VALUE, &key) == ERROR_SUCCESS)
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{
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DWORD first, last;
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int year, i;
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gchar *s;
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size = sizeof first;
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if (RegQueryValueExA (key, "FirstEntry", NULL, NULL,
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(LPBYTE) &first, &size) != ERROR_SUCCESS)
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goto failed;
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size = sizeof last;
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if (RegQueryValueExA (key, "LastEntry", NULL, NULL,
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(LPBYTE) &last, &size) != ERROR_SUCCESS)
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goto failed;
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*rules_num = last - first + 2;
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*rules = g_new0 (TimeZoneRule, *rules_num);
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for (year = first, i = 0; year <= last; year++)
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{
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s = g_strdup_printf ("%d", year);
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size = sizeof tzi;
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if (RegQueryValueExA (key, s, NULL, NULL,
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(LPBYTE) &tzi, &size) != ERROR_SUCCESS)
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{
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g_free (*rules);
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*rules = NULL;
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break;
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}
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g_free (s);
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if (year > first && memcmp (&tzi_prev, &tzi, sizeof tzi) == 0)
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continue;
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else
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memcpy (&tzi_prev, &tzi, sizeof tzi);
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rule_from_windows_time_zone_info (&(*rules)[i], tzi.Bias,
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tzi.StandardBias, tzi.DaylightBias,
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tzi.StandardDate, tzi.DaylightDate);
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(*rules)[i++].start_year = year;
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}
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*rules_num = i + 1;
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failed:
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RegCloseKey (key);
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}
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else if (RegOpenKeyExA (HKEY_LOCAL_MACHINE, subkey, 0,
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KEY_QUERY_VALUE, &key) == ERROR_SUCCESS)
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{
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size = sizeof tzi;
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if (RegQueryValueExA (key, "TZI", NULL, NULL,
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(LPBYTE) &tzi, &size) == ERROR_SUCCESS)
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{
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*rules_num = 2;
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*rules = g_new0 (TimeZoneRule, 2);
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rule_from_windows_time_zone_info (&(*rules)[0], tzi.Bias,
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tzi.StandardBias, tzi.DaylightBias,
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tzi.StandardDate, tzi.DaylightDate);
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}
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RegCloseKey (key);
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}
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g_free (subkey_dynamic);
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g_free (subkey);
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g_free (key_name);
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if (*rules)
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{
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(*rules)[0].start_year = MIN_TZYEAR;
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if ((*rules)[*rules_num - 2].start_year < MAX_TZYEAR)
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(*rules)[*rules_num - 1].start_year = MAX_TZYEAR;
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else
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(*rules)[*rules_num - 1].start_year = (*rules)[*rules_num - 2].start_year + 1;
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return TRUE;
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}
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else
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return FALSE;
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}
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#endif
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static void
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@ -938,6 +1158,7 @@ rules_from_identifier (const gchar *identifier,
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return FALSE;
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dlt_name_pos = pos;
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dlt_offset_pos = NULL;
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/* Format 2 */
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if (*pos != '\0')
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@ -952,9 +1173,14 @@ rules_from_identifier (const gchar *identifier,
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dlt_offset_pos = pos;
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#ifndef G_OS_WIN32
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/* Start and end required (format 2) */
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if (*pos == '\0')
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return FALSE;
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#else
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if (*pos != '\0')
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{
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#endif
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/* Default offset is 1 hour less from standard offset */
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if (*pos++ == ',')
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@ -1007,6 +1233,10 @@ rules_from_identifier (const gchar *identifier,
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if (!ret)
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return FALSE;
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#ifdef G_OS_WIN32
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}
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#endif
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}
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@ -1020,6 +1250,34 @@ rules_from_identifier (const gchar *identifier,
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dlt_start.mon = 0;
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}
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#ifdef G_OS_WIN32
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/* If doesn't have offset for daylight then it is Windows format */
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if (dlt_offset_pos == pos)
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{
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int i;
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/* Use US rules, Windows' default is Pacific Standard Time */
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dlt_offset = std_offset - 60 * 60;
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if (rules_from_windows_time_zone ("Pacific Standard Time", rules, rules_num, NULL, NULL))
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{
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for (i = 0; i < *rules_num - 1; i++)
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{
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(*rules)[i].std_offset = -std_offset;
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(*rules)[i].dlt_offset = -dlt_offset;
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(*rules)[i].std_name = *std_name;
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(*rules)[i].dlt_name = *dlt_name;
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}
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return TRUE;
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}
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else
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return FALSE;
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}
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#endif
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*rules_num = 2;
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*rules = g_new0 (TimeZoneRule, 2);
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@ -1068,6 +1326,13 @@ rules_from_identifier (const gchar *identifier,
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* 0 is a Sunday). Times are in local wall clock time, the default is
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* 02:00:00.
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*
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* In Windows, the "tzn[+|–]hh[:mm[:ss]][dzn]" format is used, but also
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* accepts POSIX format. The Windows format uses US rules for all time
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* zones; daylight savings time is 60 minutes behind the standard time
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* with date and time of change taken from Pacific Standard Time.
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* Offsets are time values to be added to the local time to get
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* Coordinated Universal Time (UTC).
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*
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* g_time_zone_new_local() calls this function with the value of the
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* <varname>TZ</varname> environment variable. This function itself is
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* independent of the value of <varname>TZ</varname>, but if @identifier
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