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mariadb/sql/time.cc
dlenev@brandersnatch.localdomain 09ba29e539 WL#1264 "Per-thread time zone support infrastructure". 
Added basic per-thread time zone functionality (based on public
domain elsie-code). Now user can select current time zone
(from the list of time zones described in system tables).
All NOW-like functions honor this time zone, values of TIMESTAMP
type are interpreted as values in this time zone, so now
our TIMESTAMP type behaves similar to Oracle's TIMESTAMP WITH
LOCAL TIME ZONE (or proper PostgresSQL type).
  
WL#1266 "CONVERT_TZ() - basic time with time zone conversion 
function".
  
Fixed problems described in Bug #2336 (Different number of warnings 
when inserting bad datetime as string or as number). This required
reworking of datetime realted warning hadling (they now generated 
at Field object level not in conversion functions).
  
Optimization: Now Field class descendants use table->in_use member
instead of current_thd macro.
2004-06-18 10:11:31 +04:00

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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Functions to handle date and time */
#include "mysql_priv.h"
#include <m_ctype.h>
static ulong const days_at_timestart=719528; /* daynr at 1970.01.01 */
uchar *days_in_month= (uchar*) "\037\034\037\036\037\036\037\037\036\037\036\037";
/*
Offset of system time zone from UTC in seconds used to speed up
work of my_system_gmt_sec() function.
*/
static long my_time_zone=0;
/*
Prepare offset of system time zone from UTC for my_system_gmt_sec() func.
SYNOPSIS
init_time()
*/
void init_time(void)
{
time_t seconds;
struct tm *l_time,tm_tmp;;
TIME my_time;
bool not_used;
seconds= (time_t) time((time_t*) 0);
localtime_r(&seconds,&tm_tmp);
l_time= &tm_tmp;
my_time_zone= 3600; /* Comp. for -3600 in my_gmt_sec */
my_time.year= (uint) l_time->tm_year+1900;
my_time.month= (uint) l_time->tm_mon+1;
my_time.day= (uint) l_time->tm_mday;
my_time.hour= (uint) l_time->tm_hour;
my_time.minute= (uint) l_time->tm_min;
my_time.second= (uint) l_time->tm_sec;
my_system_gmt_sec(&my_time, &my_time_zone, &not_used); /* Init my_time_zone */
}
/*
Convert time in TIME representation in system time zone to its
my_time_t form (number of seconds in UTC since begginning of Unix Epoch).
SYNOPSIS
my_system_gmt_sec()
t - time value to be converted
my_timezone - pointer to long where offset of system time zone
from UTC will be stored for caching
in_dst_time_gap - set to true if time falls into spring time-gap
NOTES
The idea is to cache the time zone offset from UTC (including daylight
saving time) for the next call to make things faster. But currently we
just calculate this offset during startup (by calling init_time()
function) and use it all the time.
Time value provided should be legal time value (e.g. '2003-01-01 25:00:00'
is not allowed).
RETURN VALUE
Time in UTC seconds since Unix Epoch representation.
*/
my_time_t
my_system_gmt_sec(const TIME *t, long *my_timezone, bool *in_dst_time_gap)
{
uint loop;
time_t tmp;
struct tm *l_time,tm_tmp;
long diff, current_timezone;
/*
Calculate the gmt time based on current time and timezone
The -1 on the end is to ensure that if have a date that exists twice
(like 2002-10-27 02:00:0 MET), we will find the initial date.
By doing -3600 we will have to call localtime_r() several times, but
I couldn't come up with a better way to get a repeatable result :(
We can't use mktime() as it's buggy on many platforms and not thread safe.
*/
tmp=(time_t) (((calc_daynr((uint) t->year,(uint) t->month,(uint) t->day) -
(long) days_at_timestart)*86400L + (long) t->hour*3600L +
(long) (t->minute*60 + t->second)) + (time_t) my_time_zone -
3600);
current_timezone= my_time_zone;
localtime_r(&tmp,&tm_tmp);
l_time=&tm_tmp;
for (loop=0;
loop < 2 &&
(t->hour != (uint) l_time->tm_hour ||
t->minute != (uint) l_time->tm_min);
loop++)
{ /* One check should be enough ? */
/* Get difference in days */
int days= t->day - l_time->tm_mday;
if (days < -1)
days= 1; // Month has wrapped
else if (days > 1)
days= -1;
diff=(3600L*(long) (days*24+((int) t->hour - (int) l_time->tm_hour)) +
(long) (60*((int) t->minute - (int) l_time->tm_min)));
current_timezone+= diff+3600; // Compensate for -3600 above
tmp+= (time_t) diff;
localtime_r(&tmp,&tm_tmp);
l_time=&tm_tmp;
}
/*
Fix that if we are in the not existing daylight saving time hour
we move the start of the next real hour
*/
if (loop == 2 && t->hour != (uint) l_time->tm_hour)
{
int days= t->day - l_time->tm_mday;
if (days < -1)
days=1; // Month has wrapped
else if (days > 1)
days= -1;
diff=(3600L*(long) (days*24+((int) t->hour - (int) l_time->tm_hour))+
(long) (60*((int) t->minute - (int) l_time->tm_min)));
if (diff == 3600)
tmp+=3600 - t->minute*60 - t->second; // Move to next hour
else if (diff == -3600)
tmp-=t->minute*60 + t->second; // Move to previous hour
*in_dst_time_gap= 1;
}
*my_timezone= current_timezone;
return (my_time_t) tmp;
} /* my_system_gmt_sec */
/* Some functions to calculate dates */
/* Calculate nr of day since year 0 in new date-system (from 1615) */
long calc_daynr(uint year,uint month,uint day)
{
long delsum;
int temp;
DBUG_ENTER("calc_daynr");
if (year == 0 && month == 0 && day == 0)
DBUG_RETURN(0); /* Skip errors */
if (year < 200)
{
if ((year=year+1900) < 1900+YY_PART_YEAR)
year+=100;
}
delsum= (long) (365L * year+ 31*(month-1) +day);
if (month <= 2)
year--;
else
delsum-= (long) (month*4+23)/10;
temp=(int) ((year/100+1)*3)/4;
DBUG_PRINT("exit",("year: %d month: %d day: %d -> daynr: %ld",
year+(month <= 2),month,day,delsum+year/4-temp));
DBUG_RETURN(delsum+(int) year/4-temp);
} /* calc_daynr */
#ifndef TESTTIME
/* Calc weekday from daynr */
/* Returns 0 for monday, 1 for tuesday .... */
int calc_weekday(long daynr,bool sunday_first_day_of_week)
{
DBUG_ENTER("calc_weekday");
DBUG_RETURN ((int) ((daynr + 5L + (sunday_first_day_of_week ? 1L : 0L)) % 7));
}
/* Calc days in one year. works with 0 <= year <= 99 */
uint calc_days_in_year(uint year)
{
return (year & 3) == 0 && (year%100 || (year%400 == 0 && year)) ?
366 : 365;
}
/*
The bits in week_format has the following meaning:
WEEK_MONDAY_FIRST (0) If not set Sunday is first day of week
If set Monday is first day of week
WEEK_YEAR (1) If not set Week is in range 0-53
Week 0 is returned for the the last week of the previous year (for
a date at start of january) In this case one can get 53 for the
first week of next year. This flag ensures that the week is
relevant for the given year. Note that this flag is only
releveant if WEEK_JANUARY is not set.
If set Week is in range 1-53.
In this case one may get week 53 for a date in January (when
the week is that last week of previous year) and week 1 for a
date in December.
WEEK_FIRST_WEEKDAY (2) If not set Weeks are numbered according
to ISO 8601:1988
If set The week that contains the first
'first-day-of-week' is week 1.
ISO 8601:1988 means that if the week containing January 1 has
four or more days in the new year, then it is week 1;
Otherwise it is the last week of the previous year, and the
next week is week 1.
*/
uint calc_week(TIME *l_time, uint week_behaviour, uint *year)
{
uint days;
ulong daynr=calc_daynr(l_time->year,l_time->month,l_time->day);
ulong first_daynr=calc_daynr(l_time->year,1,1);
bool monday_first= test(week_behaviour & WEEK_MONDAY_FIRST);
bool week_year= test(week_behaviour & WEEK_YEAR);
bool first_weekday= test(week_behaviour & WEEK_FIRST_WEEKDAY);
uint weekday=calc_weekday(first_daynr, !monday_first);
*year=l_time->year;
if (l_time->month == 1 && l_time->day <= 7-weekday)
{
if (!week_year &&
(first_weekday && weekday != 0 ||
!first_weekday && weekday >= 4))
return 0;
week_year= 1;
(*year)--;
first_daynr-= (days=calc_days_in_year(*year));
weekday= (weekday + 53*7- days) % 7;
}
if ((first_weekday && weekday != 0) ||
(!first_weekday && weekday >= 4))
days= daynr - (first_daynr+ (7-weekday));
else
days= daynr - (first_daynr - weekday);
if (week_year && days >= 52*7)
{
weekday= (weekday + calc_days_in_year(*year)) % 7;
if (!first_weekday && weekday < 4 ||
first_weekday && weekday == 0)
{
(*year)++;
return 1;
}
}
return days/7+1;
}
/* Change a daynr to year, month and day */
/* Daynr 0 is returned as date 00.00.00 */
void get_date_from_daynr(long daynr,uint *ret_year,uint *ret_month,
uint *ret_day)
{
uint year,temp,leap_day,day_of_year,days_in_year;
uchar *month_pos;
DBUG_ENTER("get_date_from_daynr");
if (daynr <= 365L || daynr >= 3652500)
{ /* Fix if wrong daynr */
*ret_year= *ret_month = *ret_day =0;
}
else
{
year= (uint) (daynr*100 / 36525L);
temp=(((year-1)/100+1)*3)/4;
day_of_year=(uint) (daynr - (long) year * 365L) - (year-1)/4 +temp;
while (day_of_year > (days_in_year= calc_days_in_year(year)))
{
day_of_year-=days_in_year;
(year)++;
}
leap_day=0;
if (days_in_year == 366)
{
if (day_of_year > 31+28)
{
day_of_year--;
if (day_of_year == 31+28)
leap_day=1; /* Handle leapyears leapday */
}
}
*ret_month=1;
for (month_pos= days_in_month ;
day_of_year > (uint) *month_pos ;
day_of_year-= *(month_pos++), (*ret_month)++)
;
*ret_year=year;
*ret_day=day_of_year+leap_day;
}
DBUG_VOID_RETURN;
}
/* Functions to handle periods */
ulong convert_period_to_month(ulong period)
{
ulong a,b;
if (period == 0)
return 0L;
if ((a=period/100) < YY_PART_YEAR)
a+=2000;
else if (a < 100)
a+=1900;
b=period%100;
return a*12+b-1;
}
ulong convert_month_to_period(ulong month)
{
ulong year;
if (month == 0L)
return 0L;
if ((year=month/12) < 100)
{
year+=(year < YY_PART_YEAR) ? 2000 : 1900;
}
return year*100+month%12+1;
}
/* Position for YYYY-DD-MM HH-MM-DD.FFFFFF AM in default format */
static uchar internal_format_positions[]=
{0, 1, 2, 3, 4, 5, 6, (uchar) 255};
static char time_separator=':';
/*
Convert a timestamp string to a TIME value.
SYNOPSIS
str_to_TIME()
str String to parse
length Length of string
l_time Date is stored here
flags Bitmap of following items
TIME_FUZZY_DATE Set if we should allow partial dates
TIME_DATETIME_ONLY Set if we only allow full datetimes.
was_cut Set to 1 if value was cut during conversion or to 0
otherwise.
DESCRIPTION
At least the following formats are recogniced (based on number of digits)
YYMMDD, YYYYMMDD, YYMMDDHHMMSS, YYYYMMDDHHMMSS
YY-MM-DD, YYYY-MM-DD, YY-MM-DD HH.MM.SS
YYYYMMDDTHHMMSS where T is a the character T (ISO8601)
Also dates where all parts are zero are allowed
The second part may have an optional .###### fraction part.
NOTES
This function should work with a format position vector as long as the
following things holds:
- All date are kept together and all time parts are kept together
- Date and time parts must be separated by blank
- Second fractions must come after second part and be separated
by a '.'. (The second fractions are optional)
- AM/PM must come after second fractions (or after seconds if no fractions)
- Year must always been specified.
- If time is before date, then we will use datetime format only if
the argument consist of two parts, separated by space.
Otherwise we will assume the argument is a date.
- The hour part must be specified in hour-minute-second order.
RETURN VALUES
TIMESTAMP_NONE String wasn't a timestamp, like
[DD [HH:[MM:[SS]]]].fraction.
l_time is not changed.
TIMESTAMP_DATE DATE string (YY MM and DD parts ok)
TIMESTAMP_DATETIME Full timestamp
TIMESTAMP_DATETIME_ERROR Timestamp with wrong values.
All elements in l_time is set to 0
*/
#define MAX_DATE_PARTS 8
timestamp_type
str_to_TIME(const char *str, uint length, TIME *l_time, uint flags,
int *was_cut)
{
uint field_length, year_length, digits, i, number_of_fields;
uint date[MAX_DATE_PARTS], date_len[MAX_DATE_PARTS];
uint add_hours= 0, start_loop;
ulong not_zero_date, allow_space;
bool is_internal_format;
const char *pos, *last_field_pos;
const char *str_begin= str;
const char *end=str+length;
const uchar *format_position;
bool found_delimitier= 0, found_space= 0;
uint frac_pos, frac_len;
DBUG_ENTER("str_to_TIME");
DBUG_PRINT("ENTER",("str: %.*s",length,str));
LINT_INIT(field_length);
LINT_INIT(year_length);
LINT_INIT(last_field_pos);
*was_cut= 0;
// Skip space at start
for (; str != end && my_isspace(&my_charset_latin1, *str) ; str++)
;
if (str == end || ! my_isdigit(&my_charset_latin1, *str))
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE);
}
is_internal_format= 0;
/* This has to be changed if want to activate different timestamp formats */
format_position= internal_format_positions;
/*
Calculate number of digits in first part.
If length= 8 or >= 14 then year is of format YYYY.
(YYYY-MM-DD, YYYYMMDD, YYYYYMMDDHHMMSS)
*/
for (pos=str; pos != end && my_isdigit(&my_charset_latin1,*pos) ; pos++)
;
digits= (uint) (pos-str);
start_loop= 0; // Start of scan loop
date_len[format_position[0]]= 0; // Length of year field
if (pos == end)
{
/* Found date in internal format (only numbers like YYYYMMDD) */
year_length= (digits == 4 || digits == 8 || digits >= 14) ? 4 : 2;
field_length=year_length-1;
is_internal_format= 1;
format_position= internal_format_positions;
}
else
{
if (format_position[0] >= 3) // If year is after HHMMDD
{
/*
If year is not in first part then we have to determinate if we got
a date field or a datetime field.
We do this by checking if there is two numbers separated by
space in the input.
*/
while (pos < end && !my_isspace(&my_charset_latin1, *pos))
pos++;
while (pos < end && !my_isdigit(&my_charset_latin1, *pos))
pos++;
if (pos == end)
{
if (flags & TIME_DATETIME_ONLY)
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE); // Can't be a full datetime
}
/* Date field. Set hour, minutes and seconds to 0 */
date[0]= date[1]= date[2]= date[3]= date[4]= 0;
start_loop= 5; // Start with first date part
}
}
}
/*
Only allow space in the first "part" of the datetime field and:
- after days, part seconds
- before and after AM/PM (handled by code later)
2003-03-03 20:00:20 AM
20:00:20.000000 AM 03-03-2000
*/
i= max((uint) format_position[0], (uint) format_position[1]);
set_if_bigger(i, (uint) format_position[2]);
allow_space= ((1 << i) | (1 << format_position[6]));
allow_space&= (1 | 2 | 4 | 8);
not_zero_date= 0;
for (i = start_loop;
i < MAX_DATE_PARTS-1 && str != end &&
my_isdigit(&my_charset_latin1,*str);
i++)
{
const char *start= str;
ulong tmp_value= (uint) (uchar) (*str++ - '0');
while (str != end && my_isdigit(&my_charset_latin1,str[0]) &&
(!is_internal_format || field_length--))
{
tmp_value=tmp_value*10 + (ulong) (uchar) (*str - '0');
str++;
}
date_len[i]= (uint) (str - start);
if (tmp_value > 999999) // Impossible date part
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE);
}
date[i]=tmp_value;
not_zero_date|= tmp_value;
/* Length-1 of next field */
field_length= format_position[i+1] == 0 ? 3 : 1;
if ((last_field_pos= str) == end)
{
i++; // Register last found part
break;
}
/* Allow a 'T' after day to allow CCYYMMDDT type of fields */
if (i == format_position[2] && *str == 'T')
{
str++; // ISO8601: CCYYMMDDThhmmss
continue;
}
if (i == format_position[5]) // Seconds
{
if (*str == '.') // Followed by part seconds
{
str++;
field_length= 5; // 5 digits after first (=6)
}
continue;
/* No part seconds */
date[++i]= 0;
}
while (str != end &&
(my_ispunct(&my_charset_latin1,*str) ||
my_isspace(&my_charset_latin1,*str)))
{
if (my_isspace(&my_charset_latin1,*str))
{
if (!(allow_space & (1 << i)))
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE);
}
found_space= 1;
}
str++;
found_delimitier= 1; // Should be a 'normal' date
}
/* Check if next position is AM/PM */
if (i == format_position[6]) // Seconds, time for AM/PM
{
i++; // Skip AM/PM part
if (format_position[7] != 255) // If using AM/PM
{
if (str+2 <= end && (str[1] == 'M' || str[1] == 'm'))
{
if (str[0] == 'p' || str[0] == 'P')
add_hours= 12;
else if (str[0] != 'a' || str[0] != 'A')
continue; // Not AM/PM
str+= 2; // Skip AM/PM
/* Skip space after AM/PM */
while (str != end && my_isspace(&my_charset_latin1,*str))
str++;
}
}
}
last_field_pos= str;
}
if (found_delimitier && !found_space && (flags & TIME_DATETIME_ONLY))
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE); // Can't be a datetime
}
str= last_field_pos;
number_of_fields= i - start_loop;
while (i < MAX_DATE_PARTS)
{
date_len[i]= 0;
date[i++]= 0;
}
if (!is_internal_format)
{
year_length= date_len[(uint) format_position[0]];
if (!year_length) // Year must be specified
{
*was_cut= 1;
DBUG_RETURN(TIMESTAMP_NONE);
}
l_time->year= date[(uint) format_position[0]];
l_time->month= date[(uint) format_position[1]];
l_time->day= date[(uint) format_position[2]];
l_time->hour= date[(uint) format_position[3]];
l_time->minute= date[(uint) format_position[4]];
l_time->second= date[(uint) format_position[5]];
frac_pos= (uint) format_position[6];
frac_len= date_len[frac_pos];
if (frac_len < 6)
date[frac_pos]*= (uint) log_10_int[6 - frac_len];
l_time->second_part= date[frac_pos];
if (format_position[7] != (uchar) 255)
{
if (l_time->hour > 12)
{
*was_cut= 1;
goto err;
}
l_time->hour= l_time->hour%12 + add_hours;
}
}
else
{
l_time->year= date[0];
l_time->month= date[1];
l_time->day= date[2];
l_time->hour= date[3];
l_time->minute= date[4];
l_time->second= date[5];
if (date_len[6] < 6)
date[6]*= (uint) log_10_int[6 - date_len[6]];
l_time->second_part=date[6];
}
l_time->neg= 0;
if (year_length == 2 && i >= format_position[1] && i >=format_position[2] &&
(l_time->month || l_time->day))
l_time->year+= (l_time->year < YY_PART_YEAR ? 2000 : 1900);
if (number_of_fields < 3 || l_time->month > 12 ||
l_time->day > 31 || l_time->hour > 23 ||
l_time->minute > 59 || l_time->second > 59 ||
(!(flags & TIME_FUZZY_DATE) && (l_time->month == 0 || l_time->day == 0)))
{
/* Only give warning for a zero date if there is some garbage after */
if (!not_zero_date) // If zero date
{
for (; str != end ; str++)
{
if (!my_isspace(&my_charset_latin1, *str))
{
not_zero_date= 1; // Give warning
break;
}
}
}
if (not_zero_date)
*was_cut= 1;
goto err;
}
l_time->time_type= (number_of_fields <= 3 ?
TIMESTAMP_DATE : TIMESTAMP_DATETIME);
for (; str != end ; str++)
{
if (!my_isspace(&my_charset_latin1,*str))
{
*was_cut= 1;
break;
}
}
DBUG_RETURN(l_time->time_type=
(number_of_fields <= 3 ? TIMESTAMP_DATE : TIMESTAMP_DATETIME));
err:
bzero((char*) l_time, sizeof(*l_time));
DBUG_RETURN(TIMESTAMP_DATETIME_ERROR);
}
/*
Convert a timestamp string to a TIME value and produce a warning
if string was truncated during conversion.
NOTE
See description of str_to_TIME() for more information.
*/
timestamp_type
str_to_TIME_with_warn(const char *str, uint length, TIME *l_time, uint flags)
{
int was_cut;
timestamp_type ts_type= str_to_TIME(str, length, l_time, flags, &was_cut);
if (was_cut)
make_truncated_value_warning(current_thd, str, length, ts_type);
return ts_type;
}
/*
Convert a datetime from broken-down TIME representation to corresponding
TIMESTAMP value.
SYNOPSIS
TIME_to_timestamp()
thd - current thread
t - datetime in broken-down representation,
in_dst_time_gap - pointer to bool which is set to true if t represents
value which doesn't exists (falls into the spring
time-gap) or to false otherwise.
RETURN
Number seconds in UTC since start of Unix Epoch corresponding to t.
0 - t contains datetime value which is out of TIMESTAMP range.
*/
my_time_t TIME_to_timestamp(THD *thd, const TIME *t, bool *in_dst_time_gap)
{
my_time_t timestamp;
*in_dst_time_gap= 0;
if (t->year < TIMESTAMP_MAX_YEAR && t->year > TIMESTAMP_MIN_YEAR ||
t->year == TIMESTAMP_MAX_YEAR && t->month == 1 && t->day == 1 ||
t->year == TIMESTAMP_MIN_YEAR && t->month == 12 && t->day == 31)
{
thd->time_zone_used= 1;
timestamp= thd->variables.time_zone->TIME_to_gmt_sec(t, in_dst_time_gap);
if (timestamp >= TIMESTAMP_MIN_VALUE && timestamp <= TIMESTAMP_MAX_VALUE)
return timestamp;
}
/* If we are here we have range error. */
return(0);
}
/*
Convert a time string to a TIME struct.
SYNOPSIS
str_to_time()
str A string in full TIMESTAMP format or
[-] DAYS [H]H:MM:SS, [H]H:MM:SS, [M]M:SS, [H]HMMSS,
[M]MSS or [S]S
There may be an optional [.second_part] after seconds
length Length of str
l_time Store result here
was_cut Set to 1 if value was cut during conversion or to 0
otherwise.
NOTES
Because of the extra days argument, this function can only
work with times where the time arguments are in the above order.
RETURN
0 ok
1 error
*/
bool str_to_time(const char *str, uint length, TIME *l_time, int *was_cut)
{
long date[5],value;
const char *end=str+length, *end_of_days;
const char *str_begin= str;
bool found_days,found_hours;
uint state;
l_time->neg=0;
*was_cut= 0;
for (; str != end && my_isspace(&my_charset_latin1,*str) ; str++)
length--;
if (str != end && *str == '-')
{
l_time->neg=1;
str++;
length--;
}
if (str == end)
return 1;
/* Check first if this is a full TIMESTAMP */
if (length >= 12)
{ // Probably full timestamp
enum timestamp_type res= str_to_TIME(str,length,l_time,
(TIME_FUZZY_DATE |
TIME_DATETIME_ONLY),
was_cut);
if ((int) res >= (int) TIMESTAMP_DATETIME_ERROR)
return res == TIMESTAMP_DATETIME_ERROR;
/* We need to restore was_cut flag since str_to_TIME can modify it */
*was_cut= 0;
}
/* Not a timestamp. Try to get this as a DAYS_TO_SECOND string */
for (value=0; str != end && my_isdigit(&my_charset_latin1,*str) ; str++)
value=value*10L + (long) (*str - '0');
/* Skip all space after 'days' */
end_of_days= str;
for (; str != end && my_isspace(&my_charset_latin1, str[0]) ; str++)
;
LINT_INIT(state);
found_days=found_hours=0;
if ((uint) (end-str) > 1 && str != end_of_days &&
my_isdigit(&my_charset_latin1, *str))
{ // Found days part
date[0]= value;
state= 1; // Assume next is hours
found_days= 1;
}
else if ((end-str) > 1 && *str == time_separator &&
my_isdigit(&my_charset_latin1, str[1]))
{
date[0]=0; // Assume we found hours
date[1]=value;
state=2;
found_hours=1;
str++; // skip ':'
}
else
{
/* String given as one number; assume HHMMSS format */
date[0]= 0;
date[1]= value/10000;
date[2]= value/100 % 100;
date[3]= value % 100;
state=4;
goto fractional;
}
/* Read hours, minutes and seconds */
for (;;)
{
for (value=0; str != end && my_isdigit(&my_charset_latin1,*str) ; str++)
value=value*10L + (long) (*str - '0');
date[state++]=value;
if (state == 4 || (end-str) < 2 || *str != time_separator ||
!my_isdigit(&my_charset_latin1,str[1]))
break;
str++; // Skip time_separator (':')
}
if (state != 4)
{ // Not HH:MM:SS
/* Fix the date to assume that seconds was given */
if (!found_hours && !found_days)
{
bmove_upp((char*) (date+4), (char*) (date+state),
sizeof(long)*(state-1));
bzero((char*) date, sizeof(long)*(4-state));
}
else
bzero((char*) (date+state), sizeof(long)*(4-state));
}
fractional:
/* Get fractional second part */
if ((end-str) >= 2 && *str == '.' && my_isdigit(&my_charset_latin1,str[1]))
{
uint field_length=5;
str++; value=(uint) (uchar) (*str - '0');
while (++str != end &&
my_isdigit(&my_charset_latin1,str[0]) &&
field_length--)
value=value*10 + (uint) (uchar) (*str - '0');
if (field_length)
value*= (long) log_10_int[field_length];
date[4]=value;
}
else
date[4]=0;
if (internal_format_positions[7] != 255)
{
/* Read a possible AM/PM */
while (str != end && my_isspace(&my_charset_latin1, *str))
str++;
if (str+2 <= end && (str[1] == 'M' || str[1] == 'm'))
{
if (str[0] == 'p' || str[0] == 'P')
{
str+= 2;
date[1]= date[1]%12 + 12;
}
else if (str[0] == 'a' || str[0] == 'A')
str+=2;
}
}
/* Some simple checks */
if (date[2] >= 60 || date[3] >= 60)
{
*was_cut= 1;
return 1;
}
l_time->year= 0; // For protocol::store_time
l_time->month= 0;
l_time->day= date[0];
l_time->hour= date[1];
l_time->minute= date[2];
l_time->second= date[3];
l_time->second_part= date[4];
l_time->time_type= TIMESTAMP_TIME;
/* Check if there is garbage at end of the TIME specification */
if (str != end)
{
do
{
if (!my_isspace(&my_charset_latin1,*str))
{
*was_cut= 1;
break;
}
} while (++str != end);
}
return 0;
}
/*
Convert a time string to a TIME struct and produce a warning
if string was cut during conversion.
NOTE
See str_to_time() for more info.
*/
bool
str_to_time_with_warn(const char *str, uint length, TIME *l_time)
{
int was_cut;
bool ret_val= str_to_time(str, length, l_time, &was_cut);
if (was_cut)
make_truncated_value_warning(current_thd, str, length, TIMESTAMP_TIME);
return ret_val;
}
/*
Convert datetime value specified as number to broken-down TIME
representation and form value of DATETIME type as side-effect.
SYNOPSIS
number_to_TIME()
nr - datetime value as number
time_res - pointer for structure for broken-down representation
fuzzy_date - indicates whenever we allow fuzzy dates
was_cut - set ot 1 if there was some kind of error during
conversion or to 0 if everything was OK.
DESCRIPTION
Convert a datetime value of formats YYMMDD, YYYYMMDD, YYMMDDHHMSS,
YYYYMMDDHHMMSS to broken-down TIME representation. Return value in
YYYYMMDDHHMMSS format as side-effect.
This function also checks if datetime value fits in DATETIME range.
RETURN VALUE
Datetime value in YYYYMMDDHHMMSS format.
If input value is not valid datetime value then 0 is returned.
*/
longlong number_to_TIME(longlong nr, TIME *time_res, bool fuzzy_date,
int *was_cut)
{
long part1,part2;
*was_cut= 0;
if (nr == LL(0) || nr >= LL(10000101000000))
goto ok;
if (nr < 101)
goto err;
if (nr <= (YY_PART_YEAR-1)*10000L+1231L)
{
nr= (nr+20000000L)*1000000L; // YYMMDD, year: 2000-2069
goto ok;
}
if (nr < (YY_PART_YEAR)*10000L+101L)
goto err;
if (nr <= 991231L)
{
nr= (nr+19000000L)*1000000L; // YYMMDD, year: 1970-1999
goto ok;
}
if (nr < 10000101L)
goto err;
if (nr <= 99991231L)
{
nr= nr*1000000L;
goto ok;
}
if (nr < 101000000L)
goto err;
if (nr <= (YY_PART_YEAR-1)*LL(10000000000)+LL(1231235959))
{
nr= nr+LL(20000000000000); // YYMMDDHHMMSS, 2000-2069
goto ok;
}
if (nr < YY_PART_YEAR*LL(10000000000)+ LL(101000000))
goto err;
if (nr <= LL(991231235959))
nr= nr+LL(19000000000000); // YYMMDDHHMMSS, 1970-1999
ok:
part1=(long) (nr/LL(1000000));
part2=(long) (nr - (longlong) part1*LL(1000000));
time_res->year= (int) (part1/10000L); part1%=10000L;
time_res->month= (int) part1 / 100;
time_res->day= (int) part1 % 100;
time_res->hour= (int) (part2/10000L); part2%=10000L;
time_res->minute=(int) part2 / 100;
time_res->second=(int) part2 % 100;
if (time_res->year <= 9999 && time_res->month <= 12 &&
time_res->day <= 31 && time_res->hour <= 23 &&
time_res->minute <= 59 && time_res->second <= 59 &&
(fuzzy_date || (time_res->month != 0 && time_res->day != 0) || nr==0))
return nr;
err:
*was_cut= 1;
return LL(0);
}
/*
Convert a system time structure to TIME
*/
void localtime_to_TIME(TIME *to, struct tm *from)
{
to->neg=0;
to->second_part=0;
to->year= (int) ((from->tm_year+1900) % 10000);
to->month= (int) from->tm_mon+1;
to->day= (int) from->tm_mday;
to->hour= (int) from->tm_hour;
to->minute= (int) from->tm_min;
to->second= (int) from->tm_sec;
}
void calc_time_from_sec(TIME *to, long seconds, long microseconds)
{
long t_seconds;
to->hour= seconds/3600L;
t_seconds= seconds%3600L;
to->minute= t_seconds/60L;
to->second= t_seconds%60L;
to->second_part= microseconds;
}
/*
Parse a format string specification
SYNOPSIS
parse_date_time_format()
format_type Format of string (time, date or datetime)
format_str String to parse
format_length Length of string
date_time_format Format to fill in
NOTES
Fills in date_time_format->positions for all date time parts.
positions marks the position for a datetime element in the format string.
The position array elements are in the following order:
YYYY-DD-MM HH-MM-DD.FFFFFF AM
0 1 2 3 4 5 6 7
If positions[0]= 5, it means that year will be the forth element to
read from the parsed date string.
RETURN
0 ok
1 error
*/
bool parse_date_time_format(timestamp_type format_type,
const char *format, uint format_length,
DATE_TIME_FORMAT *date_time_format)
{
uint offset= 0, separators= 0;
const char *ptr= format, *format_str;
const char *end= ptr+format_length;
uchar *dt_pos= date_time_format->positions;
/* need_p is set if we are using AM/PM format */
bool need_p= 0, allow_separator= 0;
ulong part_map= 0, separator_map= 0;
const char *parts[16];
date_time_format->time_separator= 0;
date_time_format->flag= 0; // For future
/*
Fill position with 'dummy' arguments to found out if a format tag is
used twice (This limit's the format to 255 characters, but this is ok)
*/
dt_pos[0]= dt_pos[1]= dt_pos[2]= dt_pos[3]=
dt_pos[4]= dt_pos[5]= dt_pos[6]= dt_pos[7]= 255;
for (; ptr != end; ptr++)
{
if (*ptr == '%' && ptr+1 != end)
{
uint position;
LINT_INIT(position);
switch (*++ptr) {
case 'y': // Year
case 'Y':
position= 0;
break;
case 'c': // Month
case 'm':
position= 1;
break;
case 'd':
case 'e':
position= 2;
break;
case 'h':
case 'I':
case 'l':
need_p= 1; // Need AM/PM
/* Fall through */
case 'k':
case 'H':
position= 3;
break;
case 'i':
position= 4;
break;
case 's':
case 'S':
position= 5;
break;
case 'f':
position= 6;
if (dt_pos[5] != offset-1 || ptr[-2] != '.')
return 1; // Wrong usage of %f
break;
case 'p': // AM/PM
if (offset == 0) // Can't be first
return 0;
position= 7;
break;
default:
return 1; // Unknown controll char
}
if (dt_pos[position] != 255) // Don't allow same tag twice
return 1;
parts[position]= ptr-1;
/*
If switching from time to date, ensure that all time parts
are used
*/
if (part_map && position <= 2 && !(part_map & (1 | 2 | 4)))
offset=5;
part_map|= (ulong) 1 << position;
dt_pos[position]= offset++;
allow_separator= 1;
}
else
{
/*
Don't allow any characters in format as this could easily confuse
the date reader
*/
if (!allow_separator)
return 1; // No separator here
allow_separator= 0; // Don't allow two separators
separators++;
/* Store in separator_map which parts are punct characters */
if (my_ispunct(&my_charset_latin1, *ptr))
separator_map|= (ulong) 1 << (offset-1);
else if (!my_isspace(&my_charset_latin1, *ptr))
return 1;
}
}
/* If no %f, specify it after seconds. Move %p up, if necessary */
if ((part_map & 32) && !(part_map & 64))
{
dt_pos[6]= dt_pos[5] +1;
parts[6]= parts[5]; // For later test in (need_p)
if (dt_pos[6] == dt_pos[7]) // Move %p one step up if used
dt_pos[7]++;
}
/*
Check that we have not used a non legal format specifier and that all
format specifiers have been used
The last test is to ensure that %p is used if and only if
it's needed.
*/
if ((format_type == TIMESTAMP_DATETIME &&
!test_all_bits(part_map, (1 | 2 | 4 | 8 | 16 | 32))) ||
(format_type == TIMESTAMP_DATE && part_map != (1 | 2 | 4)) ||
(format_type == TIMESTAMP_TIME &&
!test_all_bits(part_map, 8 | 16 | 32)) ||
!allow_separator || // %option should be last
(need_p && dt_pos[6] +1 != dt_pos[7]) ||
(need_p ^ (dt_pos[7] != 255)))
return 1;
if (dt_pos[6] != 255) // If fractional seconds
{
/* remove fractional seconds from later tests */
uint pos= dt_pos[6] -1;
/* Remove separator before %f from sep map */
separator_map= ((separator_map & ((ulong) (1 << pos)-1)) |
((separator_map & ~((ulong) (1 << pos)-1)) >> 1));
if (part_map & 64)
{
separators--; // There is always a separator
need_p= 1; // force use of separators
}
}
/*
Remove possible separator before %p from sep_map
(This can either be at position 3, 4, 6 or 7) h.m.d.%f %p
*/
if (dt_pos[7] != 255)
{
if (need_p && parts[7] != parts[6]+2)
separators--;
}
/*
Calculate if %p is in first or last part of the datetime field
At this point we have either %H-%i-%s %p 'year parts' or
'year parts' &H-%i-%s %p" as %f was removed above
*/
offset= dt_pos[6] <= 3 ? 3 : 6;
/* Remove separator before %p from sep map */
separator_map= ((separator_map & ((ulong) (1 << offset)-1)) |
((separator_map & ~((ulong) (1 << offset)-1)) >> 1));
format_str= 0;
switch (format_type) {
case TIMESTAMP_DATE:
format_str= known_date_time_formats[INTERNAL_FORMAT].date_format;
/* fall through */
case TIMESTAMP_TIME:
if (!format_str)
format_str=known_date_time_formats[INTERNAL_FORMAT].time_format;
/*
If there is no separators, allow the internal format as we can read
this. If separators are used, they must be between each part
*/
if (format_length == 6 && !need_p &&
!my_strnncoll(&my_charset_bin,
(const uchar *) format, 6,
(const uchar *) format_str, 6))
return 0;
if (separator_map == (1 | 2))
{
if (format_type == TIMESTAMP_TIME)
{
if (*(format+2) != *(format+5))
break; // Error
/* Store the character used for time formats */
date_time_format->time_separator= *(format+2);
}
return 0;
}
break;
case TIMESTAMP_DATETIME:
/*
If there is no separators, allow the internal format as we can read
this. If separators are used, they must be between each part.
Between DATE and TIME we also allow space as separator
*/
if ((format_length == 12 && !need_p &&
!my_strnncoll(&my_charset_bin,
(const uchar *) format, 12,
(const uchar*) known_date_time_formats[INTERNAL_FORMAT].datetime_format,
12)) ||
(separators == 5 && separator_map == (1 | 2 | 8 | 16)))
return 0;
break;
default:
DBUG_ASSERT(1);
break;
}
return 1; // Error
}
/*
Create a DATE_TIME_FORMAT object from a format string specification
SYNOPSIS
date_time_format_make()
format_type Format to parse (time, date or datetime)
format_str String to parse
format_length Length of string
NOTES
The returned object should be freed with my_free()
RETURN
NULL ponter: Error
new object
*/
DATE_TIME_FORMAT
*date_time_format_make(timestamp_type format_type,
const char *format_str, uint format_length)
{
DATE_TIME_FORMAT tmp;
if (format_length && format_length < 255 &&
!parse_date_time_format(format_type, format_str,
format_length, &tmp))
{
tmp.format.str= (char*) format_str;
tmp.format.length= format_length;
return date_time_format_copy((THD *)0, &tmp);
}
return 0;
}
/*
Create a copy of a DATE_TIME_FORMAT object
SYNOPSIS
date_and_time_format_copy()
thd Set if variable should be allocated in thread mem
format format to copy
NOTES
The returned object should be freed with my_free()
RETURN
NULL ponter: Error
new object
*/
DATE_TIME_FORMAT *date_time_format_copy(THD *thd, DATE_TIME_FORMAT *format)
{
DATE_TIME_FORMAT *new_format;
ulong length= sizeof(*format) + format->format.length + 1;
if (thd)
new_format= (DATE_TIME_FORMAT *) thd->alloc(length);
else
new_format= (DATE_TIME_FORMAT *) my_malloc(length, MYF(MY_WME));
if (new_format)
{
/* Put format string after current pos */
new_format->format.str= (char*) (new_format+1);
memcpy((char*) new_format->positions, (char*) format->positions,
sizeof(format->positions));
new_format->time_separator= format->time_separator;
/* We make the string null terminated for easy printf in SHOW VARIABLES */
memcpy((char*) new_format->format.str, format->format.str,
format->format.length);
new_format->format.str[format->format.length]= 0;
new_format->format.length= format->format.length;
}
return new_format;
}
KNOWN_DATE_TIME_FORMAT known_date_time_formats[6]=
{
{"USA", "%m.%d.%Y", "%Y-%m-%d %H.%i.%s", "%h:%i:%s %p" },
{"JIS", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
{"ISO", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
{"EUR", "%d.%m.%Y", "%Y-%m-%d %H.%i.%s", "%H.%i.%s" },
{"INTERNAL", "%Y%m%d", "%Y%m%d%H%i%s", "%H%i%s" },
{ 0, 0, 0, 0 }
};
/*
Return format string according format name.
If name is unknown, result is NULL
*/
const char *get_date_time_format_str(KNOWN_DATE_TIME_FORMAT *format,
timestamp_type type)
{
switch (type) {
case TIMESTAMP_DATE:
return format->date_format;
case TIMESTAMP_DATETIME:
return format->datetime_format;
case TIMESTAMP_TIME:
return format->time_format;
default:
DBUG_ASSERT(0); // Impossible
return 0;
}
}
/****************************************************************************
Functions to create default time/date/datetime strings
NOTE:
For the moment the DATE_TIME_FORMAT argument is ignored becasue
MySQL doesn't support comparing of date/time/datetime strings that
are not in arbutary order as dates are compared as strings in some
context)
This functions don't check that given TIME structure members are
in valid range. If they are not, return value won't reflect any
valid date either. Additionally, make_time doesn't take into
account time->day member: it's assumed that days have been converted
to hours already.
****************************************************************************/
void make_time(const DATE_TIME_FORMAT *format __attribute__((unused)),
const TIME *l_time, String *str)
{
long length= my_sprintf((char*) str->ptr(),
((char*) str->ptr(),
"%s%02d:%02d:%02d",
(l_time->neg ? "-" : ""),
l_time->hour,
l_time->minute,
l_time->second));
str->length(length);
str->set_charset(&my_charset_bin);
}
void make_date(const DATE_TIME_FORMAT *format __attribute__((unused)),
const TIME *l_time, String *str)
{
long length= my_sprintf((char*) str->ptr(),
((char*) str->ptr(),
"%04d-%02d-%02d",
l_time->year,
l_time->month,
l_time->day));
str->length(length);
str->set_charset(&my_charset_bin);
}
void make_datetime(const DATE_TIME_FORMAT *format __attribute__((unused)),
const TIME *l_time, String *str)
{
long length= my_sprintf((char*) str->ptr(),
((char*) str->ptr(),
"%04d-%02d-%02d %02d:%02d:%02d",
l_time->year,
l_time->month,
l_time->day,
l_time->hour,
l_time->minute,
l_time->second));
str->length(length);
str->set_charset(&my_charset_bin);
}
void make_truncated_value_warning(THD *thd, const char *str_val,
uint str_length, timestamp_type time_type)
{
char warn_buff[MYSQL_ERRMSG_SIZE];
const char *type_str;
char buff[128];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.length(0);
str.append(str_val, str_length);
str.append('\0');
switch (time_type) {
case TIMESTAMP_DATE:
type_str= "date";
break;
case TIMESTAMP_TIME:
type_str= "time";
break;
case TIMESTAMP_DATETIME: // FALLTHROUGH
default:
type_str= "datetime";
break;
}
sprintf(warn_buff, ER(ER_TRUNCATED_WRONG_VALUE),
type_str, str.ptr());
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TRUNCATED_WRONG_VALUE, warn_buff);
}
/* Convert time value to integer in YYYYMMDDHHMMSS format */
ulonglong TIME_to_ulonglong_datetime(const TIME *time)
{
return ((ulonglong) (time->year * 10000UL +
time->month * 100UL +
time->day) * ULL(1000000) +
(ulonglong) (time->hour * 10000UL +
time->minute * 100UL +
time->second));
}
/* Convert TIME value to integer in YYYYMMDD format */
ulonglong TIME_to_ulonglong_date(const TIME *time)
{
return (ulonglong) (time->year * 10000UL + time->month * 100UL + time->day);
}
/*
Convert TIME value to integer in HHMMSS format.
This function doesn't take into account time->day member:
it's assumed that days have been converted to hours already.
*/
ulonglong TIME_to_ulonglong_time(const TIME *time)
{
return (ulonglong) (time->hour * 10000UL +
time->minute * 100UL +
time->second);
}
/*
Convert struct TIME (date and time split into year/month/day/hour/...
to a number in format YYYYMMDDHHMMSS (DATETIME),
YYYYMMDD (DATE) or HHMMSS (TIME).
SYNOPSIS
TIME_to_ulonglong()
DESCRIPTION
The function is used when we need to convert value of time item
to a number if it's used in numeric context, i. e.:
SELECT NOW()+1, CURDATE()+0, CURTIMIE()+0;
SELECT ?+1;
NOTE
This function doesn't check that given TIME structure members are
in valid range. If they are not, return value won't reflect any
valid date either.
*/
ulonglong TIME_to_ulonglong(const TIME *time)
{
switch (time->time_type) {
case TIMESTAMP_DATETIME:
return TIME_to_ulonglong_datetime(time);
case TIMESTAMP_DATE:
return TIME_to_ulonglong_date(time);
case TIMESTAMP_TIME:
return TIME_to_ulonglong_time(time);
case TIMESTAMP_NONE:
case TIMESTAMP_DATETIME_ERROR:
return ULL(0);
default:
DBUG_ASSERT(0);
}
return 0;
}
/*
Convert struct DATE/TIME/DATETIME value to string using built-in
MySQL time conversion formats.
SYNOPSIS
TIME_to_string()
NOTE
The string must have at least MAX_DATE_REP_LENGTH bytes reserved.
*/
void TIME_to_string(const TIME *time, String *str)
{
switch (time->time_type) {
case TIMESTAMP_DATETIME:
make_datetime((DATE_TIME_FORMAT*) 0, time, str);
break;
case TIMESTAMP_DATE:
make_date((DATE_TIME_FORMAT*) 0, time, str);
break;
case TIMESTAMP_TIME:
make_time((DATE_TIME_FORMAT*) 0, time, str);
break;
case TIMESTAMP_NONE:
case TIMESTAMP_DATETIME_ERROR:
str->length(0);
str->set_charset(&my_charset_bin);
break;
default:
DBUG_ASSERT(0);
}
}
#endif
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