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GTimeZone: Parse POSIX format for TZ
Parse the "std offset [dst [offset],start[/time],end[/time]]" (POSIX) format used in Unix for environment variable TZ. https://bugzilla.gnome.org/show_bug.cgi?id=686128
This commit is contained in:
Arnel A. Borja
John Ralls
parent
9a4a53c03d
commit
87436e6b3d
341
glib/gtimezone.c
341
glib/gtimezone.c
@ -38,6 +38,7 @@
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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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#include "gdate.h"
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/**
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* SECTION:timezone
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@ -737,6 +738,304 @@ init_zone_from_rules (GTimeZone *gtz,
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}
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}
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/*
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* parses date[/time] for parsing TZ environment variable
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*
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* date is either Mm.w.d, Jn or N
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* - m is 1 to 12
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* - w is 1 to 5
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* - d is 0 to 6
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* - n is 1 to 365
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* - N is 0 to 365
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*
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* time is either h or hh[[:]mm[[[:]ss]]]
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* - h[h] is 0 to 23
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* - mm is 00 to 59
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* - ss is 00 to 59
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*/
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static gboolean
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parse_tz_boundary (const gchar *identifier,
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TimeZoneDate *boundary)
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{
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const gchar *pos;
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gint month, week, day;
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GDate *date;
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pos = identifier;
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if (*pos == 'M') /* Relative date */
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{
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pos++;
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if (*pos == '\0' || *pos < '0' || '9' < *pos)
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return FALSE;
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month = *pos++ - '0';
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if ((month == 1 && *pos >= '0' && '2' >= *pos) ||
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(month == 0 && *pos >= '0' && '9' >= *pos))
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{
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month *= 10;
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month += *pos++ - '0';
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}
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if (*pos++ != '.' || month == 0)
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return FALSE;
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if (*pos == '\0' || *pos < '1' || '5' < *pos)
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return FALSE;
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week = *pos++ - '0';
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if (*pos++ != '.')
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return FALSE;
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if (*pos == '\0' || *pos < '0' || '6' < *pos)
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return FALSE;
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day = *pos++ - '0';
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if (!day)
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day += 7;
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boundary->year = 0;
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boundary->mon = month;
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boundary->week = week;
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boundary->wday = day;
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}
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else if (*pos == 'J') /* Julian day */
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{
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pos++;
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day = 0;
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while (*pos >= '0' && '9' >= *pos)
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{
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day *= 10;
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day += *pos++ - '0';
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}
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if (day < 1 || 365 < day)
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return FALSE;
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date = g_date_new_julian (day);
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boundary->year = 0;
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boundary->mon = (int) g_date_get_month (date);
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boundary->mday = (int) g_date_get_day (date);
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boundary->wday = 0;
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g_date_free (date);
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}
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else if (*pos >= '0' && '9' >= *pos) /* Zero-based Julian day */
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{
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day = 0;
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while (*pos >= '0' && '9' >= *pos)
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{
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day *= 10;
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day += *pos++ - '0';
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}
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if (day < 0 || 365 < day)
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return FALSE;
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date = g_date_new_julian (day >= 59? day : day + 1);
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boundary->year = 0;
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boundary->mon = (int) g_date_get_month (date);
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boundary->mday = (int) g_date_get_day (date);
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boundary->wday = 0;
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g_date_free (date);
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/* February 29 */
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if (day == 59)
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boundary->mday++;
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}
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else
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return FALSE;
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/* Time */
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boundary->isstd = FALSE;
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boundary->isgmt = FALSE;
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if (*pos == '/')
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{
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gint32 offset;
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if (!parse_time (++pos, &offset))
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return FALSE;
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boundary->hour = offset / 3600;
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boundary->min = (offset / 60) % 60;
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boundary->sec = offset % 3600;
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return TRUE;
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}
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else
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{
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boundary->hour = 2;
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boundary->min = 0;
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boundary->sec = 0;
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return *pos == '\0';
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}
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}
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/*
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* Creates an array of TimeZoneRule from a TZ environment variable
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* type of identifier. Should free rules, std_name and dlt_name
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* afterwards
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*/
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static gboolean
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rules_from_identifier (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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const gchar *std_name_pos, *std_offset_pos;
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const gchar *dlt_name_pos, *dlt_offset_pos;
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const gchar *start_date_pos, *end_date_pos;
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const gchar *pos;
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gchar *buffer;
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gboolean ret;
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gint32 std_offset, dlt_offset;
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TimeZoneDate dlt_start, dlt_end;
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if (!identifier)
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return FALSE;
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pos = identifier;
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std_name_pos = pos;
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/* Name is alpha */
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while ((*pos >= 'a' && 'z' >= *pos) || (*pos >= 'A' && 'Z' >= *pos))
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pos++;
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/* Offset for standard required (format 1) */
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if (*pos == '\0')
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return FALSE;
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/* Name should be three or more alphabetic characters */
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if (pos - identifier < 3)
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return FALSE;
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std_offset_pos = pos;
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/* Standard offset */
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while (*pos == '+' || *pos == '-' || *pos == ':' || (*pos >= '0' && '9' >= *pos))
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pos++;
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buffer = g_strndup (std_offset_pos, pos - std_offset_pos);
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ret = parse_constant_offset (buffer, &std_offset);
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g_free (buffer);
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if (!ret)
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return FALSE;
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dlt_name_pos = pos;
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/* Format 2 */
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if (*pos != '\0')
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{
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/* Name is alpha */
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while ((*pos >= 'a' && 'z' >= *pos) || (*pos >= 'A' && 'Z' >= *pos))
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pos++;
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/* Name should be three or more alphabetic characters */
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if (pos - identifier < 3)
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return FALSE;
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dlt_offset_pos = pos;
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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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/* Default offset is 1 hour less from standard offset */
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if (*pos++ == ',')
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dlt_offset = std_offset - 60 * 60;
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else
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{
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/* Daylight offset */
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while (*pos == '+' || *pos == '-' || *pos == ':' || (*pos >= '0' && '9' >= *pos))
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pos++;
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buffer = g_strndup (dlt_offset_pos, pos - dlt_offset_pos);
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ret = parse_constant_offset (buffer, &dlt_offset);
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g_free (buffer);
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if (!ret)
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return FALSE;
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/* Start and end required (format 2) */
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if (*pos++ != ',')
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return FALSE;
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}
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/* Start date */
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start_date_pos = pos;
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while (*pos != ',' && *pos != '\0')
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pos++;
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/* End required (format 2) */
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if (*pos == '\0')
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return FALSE;
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buffer = g_strndup (start_date_pos, pos++ - start_date_pos);
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ret = parse_tz_boundary (buffer, &dlt_start);
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g_free (buffer);
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if (!ret)
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return FALSE;
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/* End date */
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end_date_pos = pos;
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while (*pos != '\0')
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pos++;
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buffer = g_strndup (end_date_pos, pos - end_date_pos);
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ret = parse_tz_boundary (buffer, &dlt_end);
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g_free (buffer);
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if (!ret)
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return FALSE;
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}
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*std_name = g_strndup (std_name_pos, std_offset_pos - std_name_pos);
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if (dlt_name_pos != pos)
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*dlt_name = g_strndup (dlt_name_pos, dlt_offset_pos - dlt_name_pos);
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else
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{
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*dlt_name = NULL;
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dlt_start.mon = 0;
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}
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*rules_num = 2;
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*rules = g_new0 (TimeZoneRule, 2);
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(*rules)[0].start_year = MIN_TZYEAR;
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(*rules)[1].start_year = MAX_TZYEAR;
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(*rules)[0].std_offset = -std_offset;
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(*rules)[0].dlt_offset = -dlt_offset;
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(*rules)[0].dlt_start = dlt_start;
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(*rules)[0].dlt_end = dlt_end;
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(*rules)[0].std_name = *std_name;
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(*rules)[0].dlt_name = *dlt_name;
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return TRUE;
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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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@ -750,12 +1049,24 @@ init_zone_from_rules (GTimeZone *gtz,
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*
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* Valid RFC3339 time offsets are <literal>"Z"</literal> (for UTC) or
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* <literal>"±hh:mm"</literal>. ISO 8601 additionally specifies
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* <literal>"±hhmm"</literal> and <literal>"±hh"</literal>.
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* <literal>"±hhmm"</literal> and <literal>"±hh"</literal>. Offsets are
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* time values to be added to Coordinated Universal Time (UTC) to get
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* the local time.
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*
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* The <varname>TZ</varname> environment variable typically corresponds
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* to the name of a file in the zoneinfo database, but there are many
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* other possibilities. Note that those other possibilities are not
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* currently implemented, but are planned.
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* In Unix, the <varname>TZ</varname> environment variable typically
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* corresponds to the name of a file in the zoneinfo database, or
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* string in "std offset [dst [offset],start[/time],end[/time]]"
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* (POSIX) format. There are no spaces in the specification. The
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* name of standard and daylight savings time zone must be three or more
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* alphabetic characters. Offsets are time values to be added to local
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* time to get Coordinated Universal Time (UTC) and should be
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* <literal>"[±]hh[[:]mm[:ss]]"</literal>. Dates are either
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* <literal>"Jn"</literal> (Julian day with n between 1 and 365, leap
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* years not counted), <literal>"n"</literal> (zero-based Julian day
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* with n between 0 and 365) or <literal>"Mm.w.d"</literal> (day d
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* (0 <= d <= 6) of week w (1 <= w <= 5) of month m (1 <= m <= 12), day
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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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* 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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@ -763,6 +1074,12 @@ init_zone_from_rules (GTimeZone *gtz,
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* is %NULL then <filename>/etc/localtime</filename> will be consulted
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* to discover the correct timezone.
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*
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* If intervals are not available, only time zone rules from
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* <varname>TZ</varname> environment variable or other means, then they
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* will be computed from year 1900 to 2037. If the maximum year for the
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* rules is available and it is greater than 2037, then it will followed
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* instead.
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*
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* See <ulink
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* url='http://tools.ietf.org/html/rfc3339#section-5.6'>RFC3339
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* §5.6</ulink> for a precise definition of valid RFC3339 time offsets
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@ -783,6 +1100,9 @@ GTimeZone *
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g_time_zone_new (const gchar *identifier)
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{
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GTimeZone *tz = NULL;
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TimeZoneRule *rules;
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gint rules_num;
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gchar *std_name, *dlt_name;
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G_LOCK (time_zones);
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if (time_zones == NULL)
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@ -805,6 +1125,17 @@ g_time_zone_new (const gchar *identifier)
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zone_for_constant_offset (tz, identifier);
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if (tz->t_info == NULL &&
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rules_from_identifier (identifier,
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&rules, &rules_num,
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&std_name, &dlt_name))
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{
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init_zone_from_rules (tz, rules, rules_num);
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g_free (rules);
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g_free (std_name);
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g_free (dlt_name);
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}
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if (tz->t_info == NULL)
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{
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#ifdef G_OS_UNIX
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