~drizzle-trunk/drizzle/development

1 by brian
clean slate
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/* Copyright (C) 2004-2005 MySQL AB
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 This program is free software; you can redistribute it and/or modify
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 it under the terms of the GNU General Public License as published by
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 the Free Software Foundation; version 2 of the License.
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 This program is distributed in the hope that it will be useful,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 GNU General Public License for more details.
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 You should have received a copy of the GNU General Public License
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 along with this program; if not, write to the Free Software
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 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/*
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  This is a private header of sql-common library, containing
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  declarations for my_time.c
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*/
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#ifndef _my_time_h_
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#define _my_time_h_
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#include "my_global.h"
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#include "mysql_time.h"
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C_MODE_START
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extern ulonglong log_10_int[20];
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extern uchar days_in_month[];
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/*
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  Portable time_t replacement.
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  Should be signed and hold seconds for 1902 -- 2038-01-19 range
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  i.e at least a 32bit variable
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  Using the system built in time_t is not an option as
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  we rely on the above requirements in the time functions
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  For example QNX has an unsigned time_t type
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*/
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typedef long my_time_t;
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#define MY_TIME_T_MAX LONG_MAX
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#define MY_TIME_T_MIN LONG_MIN
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/* Time handling defaults */
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#define TIMESTAMP_MAX_YEAR 2038
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#define TIMESTAMP_MIN_YEAR (1900 + YY_PART_YEAR - 1)
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#define TIMESTAMP_MAX_VALUE INT_MAX32
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#define TIMESTAMP_MIN_VALUE 1
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/* two-digit years < this are 20..; >= this are 19.. */
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#define YY_PART_YEAR	   70
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/* Flags to str_to_datetime */
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#define TIME_FUZZY_DATE		1
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#define TIME_DATETIME_ONLY	2
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/* Must be same as MODE_NO_ZERO_IN_DATE */
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#define TIME_NO_ZERO_IN_DATE    (65536L*2*2*2*2*2*2*2)
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/* Must be same as MODE_NO_ZERO_DATE */
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#define TIME_NO_ZERO_DATE	(TIME_NO_ZERO_IN_DATE*2)
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#define TIME_INVALID_DATES	(TIME_NO_ZERO_DATE*2)
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#define MYSQL_TIME_WARN_TRUNCATED    1
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#define MYSQL_TIME_WARN_OUT_OF_RANGE 2
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/* Limits for the TIME data type */
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#define TIME_MAX_HOUR 838
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#define TIME_MAX_MINUTE 59
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#define TIME_MAX_SECOND 59
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#define TIME_MAX_VALUE (TIME_MAX_HOUR*10000 + TIME_MAX_MINUTE*100 + \
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                        TIME_MAX_SECOND)
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#define TIME_MAX_VALUE_SECONDS (TIME_MAX_HOUR * 3600L + \
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                                TIME_MAX_MINUTE * 60L + TIME_MAX_SECOND)
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my_bool check_date(const MYSQL_TIME *ltime, my_bool not_zero_date,
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                   ulong flags, int *was_cut);
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enum enum_mysql_timestamp_type
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str_to_datetime(const char *str, uint length, MYSQL_TIME *l_time,
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                uint flags, int *was_cut);
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longlong number_to_datetime(longlong nr, MYSQL_TIME *time_res,
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                            uint flags, int *was_cut);
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ulonglong TIME_to_ulonglong_datetime(const MYSQL_TIME *);
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ulonglong TIME_to_ulonglong_date(const MYSQL_TIME *);
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ulonglong TIME_to_ulonglong_time(const MYSQL_TIME *);
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ulonglong TIME_to_ulonglong(const MYSQL_TIME *);
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my_bool str_to_time(const char *str,uint length, MYSQL_TIME *l_time,
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                    int *warning);
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int check_time_range(struct st_mysql_time *, int *warning);
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long calc_daynr(uint year,uint month,uint day);
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uint calc_days_in_year(uint year);
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uint year_2000_handling(uint year);
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void init_time(void);
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/*
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  Function to check sanity of a TIMESTAMP value
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  DESCRIPTION
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    Check if a given MYSQL_TIME value fits in TIMESTAMP range.
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    This function doesn't make precise check, but rather a rough
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    estimate.
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  RETURN VALUES
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    FALSE   The value seems sane
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    TRUE    The MYSQL_TIME value is definitely out of range
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*/
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static inline my_bool validate_timestamp_range(const MYSQL_TIME *t)
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{
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  if ((t->year > TIMESTAMP_MAX_YEAR || t->year < TIMESTAMP_MIN_YEAR) ||
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      (t->year == TIMESTAMP_MAX_YEAR && (t->month > 1 || t->day > 19)) ||
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      (t->year == TIMESTAMP_MIN_YEAR && (t->month < 12 || t->day < 31)))
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    return FALSE;
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  return TRUE;
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}
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my_time_t 
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my_system_gmt_sec(const MYSQL_TIME *t, long *my_timezone,
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                  my_bool *in_dst_time_gap);
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void set_zero_time(MYSQL_TIME *tm, enum enum_mysql_timestamp_type time_type);
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/*
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  Required buffer length for my_time_to_str, my_date_to_str,
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  my_datetime_to_str and TIME_to_string functions. Note, that the
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  caller is still responsible to check that given TIME structure
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  has values in valid ranges, otherwise size of the buffer could
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  be not enough. We also rely on the fact that even wrong values
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  sent using binary protocol fit in this buffer.
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*/
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#define MAX_DATE_STRING_REP_LENGTH 30
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int my_time_to_str(const MYSQL_TIME *l_time, char *to);
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int my_date_to_str(const MYSQL_TIME *l_time, char *to);
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int my_datetime_to_str(const MYSQL_TIME *l_time, char *to);
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int my_TIME_to_str(const MYSQL_TIME *l_time, char *to);
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/* 
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  Available interval types used in any statement.
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  'interval_type' must be sorted so that simple intervals comes first,
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  ie year, quarter, month, week, day, hour, etc. The order based on
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  interval size is also important and the intervals should be kept in a
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  large to smaller order. (get_interval_value() depends on this)
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  Note: If you change the order of elements in this enum you should fix 
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  order of elements in 'interval_type_to_name' and 'interval_names' 
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  arrays 
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  See also interval_type_to_name, get_interval_value, interval_names
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*/
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enum interval_type
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{
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  INTERVAL_YEAR, INTERVAL_QUARTER, INTERVAL_MONTH, INTERVAL_WEEK, INTERVAL_DAY,
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  INTERVAL_HOUR, INTERVAL_MINUTE, INTERVAL_SECOND, INTERVAL_MICROSECOND,
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  INTERVAL_YEAR_MONTH, INTERVAL_DAY_HOUR, INTERVAL_DAY_MINUTE,
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  INTERVAL_DAY_SECOND, INTERVAL_HOUR_MINUTE, INTERVAL_HOUR_SECOND,
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  INTERVAL_MINUTE_SECOND, INTERVAL_DAY_MICROSECOND, INTERVAL_HOUR_MICROSECOND,
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  INTERVAL_MINUTE_MICROSECOND, INTERVAL_SECOND_MICROSECOND, INTERVAL_LAST
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};
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C_MODE_END
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#endif /* _my_time_h_ */