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GTimeZone: Add initialization functions for rules
Add functions to initialize a GTimeZone from rules.
This commit is contained in:
Arnel A. Borja
John Ralls
parent
9fae921c3e
commit
9a4a53c03d
277
glib/gtimezone.c
277
glib/gtimezone.c
@ -37,6 +37,7 @@
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#include "gthread.h"
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#include "gbytes.h"
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#include "gslice.h"
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#include "gdatetime.h"
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/**
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* SECTION:timezone
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@ -130,6 +131,31 @@ typedef struct
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gint info_index;
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} Transition;
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typedef struct
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{
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gint year;
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gint mon;
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gint mday;
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gint wday;
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gint week;
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gint hour;
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gint min;
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gint sec;
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gboolean isstd;
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gboolean isgmt;
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} TimeZoneDate;
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typedef struct
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{
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gint start_year;
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gint32 std_offset;
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gint32 dlt_offset;
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TimeZoneDate dlt_start;
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TimeZoneDate dlt_end;
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const gchar *std_name;
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const gchar *dlt_name;
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} TimeZoneRule;
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/* GTimeZone structure and lifecycle {{{1 */
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struct _GTimeZone
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@ -143,6 +169,9 @@ struct _GTimeZone
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G_LOCK_DEFINE_STATIC (time_zones);
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static GHashTable/*<string?, GTimeZone>*/ *time_zones;
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#define MIN_TZYEAR 1900
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#define MAX_TZYEAR 2038
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/**
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* g_time_zone_unref:
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* @tz: a #GTimeZone
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@ -460,6 +489,254 @@ init_zone_from_iana_info (GTimeZone *gtz, GBytes *zoneinfo)
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#endif
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static void
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find_relative_date (TimeZoneDate *buffer,
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GTimeZone *tz)
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{
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GDateTime *dt;
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gint wday;
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wday = buffer->wday;
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/* Get last day if last is needed, first day otherwise */
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dt = g_date_time_new (tz,
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buffer->year,
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buffer->mon + (buffer->week < 5? 0 : 1),
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buffer->week < 5? 1 : 0,
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buffer->hour, buffer->min, buffer->sec);
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buffer->wday = g_date_time_get_day_of_week (dt);
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buffer->mday = g_date_time_get_day_of_month (dt);
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if (buffer->week < 5)
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{
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if (wday < buffer->wday)
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buffer->wday -= 7;
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buffer->mday += (buffer->week - 1) * 7;
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}
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else if (wday > buffer->wday)
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buffer->wday += 7;
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buffer->mday += wday - buffer->wday;
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buffer->wday = wday;
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g_date_time_unref (dt);
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}
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/* Offset is previous offset of local time */
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static gint64
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boundary_for_year (TimeZoneDate *boundary,
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gint year,
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gint32 prev_offset,
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gint32 std_offset)
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{
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TimeZoneDate buffer;
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GDateTime *dt;
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GTimeZone *tz;
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gint64 t;
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gint32 offset;
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gchar *identifier;
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buffer = *boundary;
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if (boundary->isgmt)
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offset = 0;
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else if (boundary->isstd)
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offset = std_offset;
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else
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offset = prev_offset;
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G_UNLOCK (time_zones);
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identifier = g_strdup_printf ("%+03d:%02d:%02d",
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(int) offset / 3600,
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(int) abs (offset / 60) % 60,
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(int) abs (offset) % 3600);
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tz = g_time_zone_new (identifier);
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g_free (identifier);
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if (boundary->year == 0)
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{
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buffer.year = year;
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if (buffer.wday)
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find_relative_date (&buffer, tz);
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}
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g_assert (buffer.year == year);
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dt = g_date_time_new (tz,
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buffer.year, buffer.mon, buffer.mday,
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buffer.hour, buffer.min, buffer.sec);
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t = g_date_time_to_unix (dt);
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g_date_time_unref (dt);
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g_time_zone_unref (tz);
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G_LOCK (time_zones);
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return t;
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}
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static void
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init_zone_from_rules (GTimeZone *gtz,
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TimeZoneRule *rules,
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gint rules_num)
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{
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TransitionInfo info[2];
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Transition trans;
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gint type_count, trans_count;
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gint year, i, x, y;
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gint32 last_offset;
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type_count = 0;
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trans_count = 0;
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/* Last rule only contains max year */
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for (i = 0; i < rules_num - 1; i++)
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{
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if (rules[i].dlt_start.mon)
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{
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type_count += 2;
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trans_count += 2 * (rules[i+1].start_year - rules[i].start_year);
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}
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else
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type_count++;
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}
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x = 0;
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y = 0;
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/* If standard time happens before daylight time in first rule
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* with daylight, skip first transition so the minimum is in
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* standard time and the first transition is in daylight time */
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for (i = 0; i < rules_num - 1 && rules[0].dlt_start.mon == 0; i++);
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if (i < rules_num -1 && rules[i].dlt_start.mon > 0 &&
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rules[i].dlt_start.mon > rules[i].dlt_end.mon)
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{
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trans_count--;
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x = -1;
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}
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gtz->t_info = g_array_sized_new (FALSE, TRUE, sizeof (TransitionInfo), type_count);
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gtz->transitions = g_array_sized_new (FALSE, TRUE, sizeof (Transition), trans_count);
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last_offset = rules[0].std_offset;
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for (i = 0; i < rules_num - 1; i++)
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{
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if (rules[i].dlt_start.mon)
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{
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/* Standard */
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info[0].gmt_offset = rules[i].std_offset;
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info[0].is_dst = FALSE;
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info[0].is_standard = rules[i].dlt_end.isstd;
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info[0].is_gmt = rules[i].dlt_end.isgmt;
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if (rules[i].std_name)
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info[0].abbrev = g_strdup (rules[i].std_name);
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else
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info[0].abbrev = g_strdup_printf ("%+03d%02d",
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(int) rules[i].std_offset / 3600,
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(int) abs (rules[i].std_offset / 60) % 60);
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/* Daylight */
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info[1].gmt_offset = rules[i].dlt_offset;
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info[1].is_dst = TRUE;
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info[1].is_standard = rules[i].dlt_start.isstd;
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info[1].is_gmt = rules[i].dlt_start.isgmt;
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if (rules[i].dlt_name)
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info[1].abbrev = g_strdup (rules[i].dlt_name);
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else
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info[1].abbrev = g_strdup_printf ("%+03d%02d",
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(int) rules[i].dlt_offset / 3600,
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(int) abs (rules[i].dlt_offset / 60) % 60);
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if (rules[i].dlt_start.mon < rules[i].dlt_end.mon)
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{
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g_array_append_val (gtz->t_info, info[1]);
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g_array_append_val (gtz->t_info, info[0]);
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}
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else
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{
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g_array_append_val (gtz->t_info, info[0]);
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g_array_append_val (gtz->t_info, info[1]);
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}
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/* Transition dates */
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for (year = rules[i].start_year; year < rules[i+1].start_year; year++)
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{
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if (rules[i].dlt_start.mon < rules[i].dlt_end.mon)
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{
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/* Daylight Data */
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trans.info_index = y;
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trans.time = boundary_for_year (&rules[i].dlt_start, year,
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last_offset, rules[i].std_offset);
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g_array_insert_val (gtz->transitions, x++, trans);
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last_offset = rules[i].dlt_offset;
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/* Standard Data */
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trans.info_index = y+1;
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trans.time = boundary_for_year (&rules[i].dlt_end, year,
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last_offset, rules[i].std_offset);
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g_array_insert_val (gtz->transitions, x++, trans);
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last_offset = rules[i].std_offset;
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}
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else
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{
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/* Standard Data */
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trans.info_index = y;
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trans.time = boundary_for_year (&rules[i].dlt_end, year,
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last_offset, rules[i].std_offset);
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if (x >= 0)
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g_array_insert_val (gtz->transitions, x++, trans);
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else
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x++;
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last_offset = rules[i].std_offset;
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/* Daylight Data */
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trans.info_index = y+1;
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trans.time = boundary_for_year (&rules[i].dlt_start, year,
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last_offset, rules[i].std_offset);
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g_array_insert_val (gtz->transitions, x++, trans);
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last_offset = rules[i].dlt_offset;
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}
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}
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y += 2;
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}
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else
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{
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/* Standard */
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info[0].gmt_offset = rules[i].std_offset;
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info[0].is_dst = FALSE;
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info[0].is_standard = FALSE;
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info[0].is_gmt = FALSE;
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if (rules[i].std_name)
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info[0].abbrev = g_strdup (rules[i].std_name);
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else
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info[0].abbrev = g_strdup_printf ("%+03d%02d",
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(int) rules[i].std_offset / 3600,
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(int) abs (rules[i].std_offset / 60) % 60);
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g_array_append_val (gtz->t_info, info[0]);
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last_offset = rules[i].std_offset;
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y++;
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}
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}
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}
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/* Construction {{{1 */
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/**
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* g_time_zone_new:
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