mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-16 03:52:35 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/sql-common/my_time.c
Sergei Golubchik 5f6380adde 10.0-base merge
2013-07-18 16:46:57 +02:00

1457 lines
42 KiB
C
Raw Blame History

/*
Copyright (c) 2004, 2012, Oracle and/or its affiliates.
Copyright (c) 2010, 2013, Monty Program 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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <my_time.h>
#include <m_string.h>
#include <m_ctype.h>
/* Windows version of localtime_r() is declared in my_ptrhead.h */
#include <my_pthread.h>
#include <mysqld_error.h>
ulonglong log_10_int[20]=
{
1, 10, 100, 1000, 10000UL, 100000UL, 1000000UL, 10000000UL,
100000000ULL, 1000000000ULL, 10000000000ULL, 100000000000ULL,
1000000000000ULL, 10000000000000ULL, 100000000000000ULL,
1000000000000000ULL, 10000000000000000ULL, 100000000000000000ULL,
1000000000000000000ULL, 10000000000000000000ULL
};
/* 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=':';
static ulong const days_at_timestart=719528; /* daynr at 1970.01.01 */
uchar days_in_month[]= {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0};
/*
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;
/* 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);
}
/**
@brief Check datetime value for validity according to flags.
@param[in] ltime Date to check.
@param[in] not_zero_date ltime is not the zero date
@param[in] flags flags to check
(see str_to_datetime() flags in my_time.h)
@param[out] was_cut set to 2 if value was invalid according to flags.
(Feb 29 in non-leap etc.) This remains unchanged
if value is not invalid.
@details Here we assume that year and month is ok!
If month is 0 we allow any date. (This only happens if we allow zero
date parts in str_to_datetime())
Disallow dates with zero year and non-zero month and/or day.
@return
0 OK
1 error
*/
my_bool check_date(const MYSQL_TIME *ltime, my_bool not_zero_date,
ulonglong flags, int *was_cut)
{
if (not_zero_date)
{
if (((flags & TIME_NO_ZERO_IN_DATE) &&
(ltime->month == 0 || ltime->day == 0)) || ltime->neg ||
(!(flags & TIME_INVALID_DATES) &&
ltime->month && ltime->day > days_in_month[ltime->month-1] &&
(ltime->month != 2 || calc_days_in_year(ltime->year) != 366 ||
ltime->day != 29)))
{
*was_cut= 2;
return TRUE;
}
}
else if (flags & TIME_NO_ZERO_DATE)
{
/*
We don't set *was_cut here to signal that the problem was a zero date
and not an invalid date
*/
return TRUE;
}
return FALSE;
}
static int get_number(uint *val, uint *number_of_fields, const char **str,
const char *end)
{
const char *s = *str;
if (s >= end)
return 0;
if (!my_isdigit(&my_charset_latin1, *s))
return 1;
*val= *s++ - '0';
for (; s < end && my_isdigit(&my_charset_latin1, *s); s++)
*val= *val * 10 + *s - '0';
*str = s;
(*number_of_fields)++;
return 0;
}
static int get_digits(uint *val, uint *number_of_fields, const char **str,
const char *end, uint length)
{
return get_number(val, number_of_fields, str, min(end, *str + length));
}
static int get_punct(const char **str, const char *end)
{
if (*str >= end)
return 0;
if (my_ispunct(&my_charset_latin1, **str))
{
(*str)++;
return 0;
}
return 1;
}
static int get_date_time_separator(uint *number_of_fields, ulonglong flags,
const char **str, const char *end)
{
const char *s= *str;
if (s >= end)
return 0;
if (*s == 'T')
{
(*str)++;
return 0;
}
/*
now, this is tricky, for backward compatibility reasons.
cast("11:11:11.12.12.12" as datetime) should give 2011-11-11 12:12:12
but
cast("11:11:11.12.12.12" as time) should give 11:11:11.12
that is, a punctuation character can be accepted as a date/time separator
only if TIME_DATETIME_ONLY (see str_to_time) is not set.
*/
if (my_ispunct(&my_charset_latin1, *s))
{
if (flags & TIME_DATETIME_ONLY)
{
/* see above, returning 1 is not enough, we need hard abort here */
*number_of_fields= 0;
return 1;
}
(*str)++;
return 0;
}
if (!my_isspace(&my_charset_latin1, *s))
return 1;
do
{
s++;
} while (my_isspace(&my_charset_latin1, *s));
*str= s;
return 0;
}
static int get_maybe_T(const char **str, const char *end)
{
if (*str < end && **str == 'T')
(*str)++;
return 0;
}
static uint skip_digits(const char **str, const char *end)
{
const char *start= *str, *s= *str;
while (s < end && my_isdigit(&my_charset_latin1, *s))
s++;
*str= s;
return s - start;
}
/**
Check datetime, date, or normalized time (i.e. time without days) range.
@param ltime Datetime value.
@returns
@retval FALSE on success
@retval TRUE on error
*/
my_bool check_datetime_range(const MYSQL_TIME *ltime)
{
/*
In case of MYSQL_TIMESTAMP_TIME hour value can be up to TIME_MAX_HOUR.
In case of MYSQL_TIMESTAMP_DATETIME it cannot be bigger than 23.
*/
return
ltime->year > 9999 || ltime->month > 12 || ltime->day > 31 ||
ltime->minute > 59 || ltime->second > 59 ||
ltime->second_part > TIME_MAX_SECOND_PART ||
(ltime->hour >
(ltime->time_type == MYSQL_TIMESTAMP_TIME ? TIME_MAX_HOUR : 23));
}
static void get_microseconds(ulong *val, MYSQL_TIME_STATUS *status,
uint *number_of_fields,
const char **str, const char *end)
{
const char *start= *str;
uint tmp= 0; /* For the case '10:10:10.' */
if (get_digits(&tmp, number_of_fields, str, end, 6))
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
if ((status->precision= (*str - start)) < 6)
*val= tmp * log_10_int[6 - (*str - start)];
else
*val= tmp;
if (skip_digits(str, end))
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
}
/*
Convert a timestamp string to a MYSQL_TIME value.
SYNOPSIS
str_to_datetime()
str String to parse
length Length of string
l_time Date is stored here
flags Bitmap of following items
TIME_FUZZY_DATE
TIME_DATETIME_ONLY Set if we only allow full datetimes.
TIME_NO_ZERO_IN_DATE Don't allow partial dates
TIME_NO_ZERO_DATE Don't allow 0000-00-00 date
TIME_INVALID_DATES Allow 2000-02-31
status Conversion status
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.
status->warnings is set to:
0 Value OK
MYSQL_TIME_WARN_TRUNCATED If value was cut during conversion
MYSQL_TIME_WARN_OUT_OF_RANGE check_date(date,flags) considers date invalid
l_time->time_type is set as follows:
MYSQL_TIMESTAMP_NONE String wasn't a timestamp, like
[DD [HH:[MM:[SS]]]].fraction.
l_time is not changed.
MYSQL_TIMESTAMP_DATE DATE string (YY MM and DD parts ok)
MYSQL_TIMESTAMP_DATETIME Full timestamp
MYSQL_TIMESTAMP_ERROR Timestamp with wrong values.
All elements in l_time is set to 0
RETURN VALUES
0 - Ok
1 - Error
*/
#define MAX_DATE_PARTS 8
my_bool
str_to_datetime(const char *str, uint length, MYSQL_TIME *l_time,
ulonglong flags, MYSQL_TIME_STATUS *status)
{
const char *end=str+length, *pos;
uint number_of_fields= 0, digits, year_length, not_zero_date;
DBUG_ENTER("str_to_datetime");
bzero(l_time, sizeof(*l_time));
if (flags & TIME_TIME_ONLY)
{
my_bool ret= str_to_time(str, length, l_time, flags, status);
DBUG_RETURN(ret);
}
my_time_status_init(status);
/* Skip space at start */
for (; str != end && my_isspace(&my_charset_latin1, *str) ; str++)
;
if (str == end || ! my_isdigit(&my_charset_latin1, *str))
{
status->warnings= MYSQL_TIME_WARN_TRUNCATED;
l_time->time_type= MYSQL_TIMESTAMP_NONE;
DBUG_RETURN(1);
}
/*
Calculate number of digits in first part.
If length= 8 or >= 14 then year is of format YYYY.
(YYYY-MM-DD, YYYYMMDD, YYYYYMMDDHHMMSS)
*/
pos= str;
digits= skip_digits(&pos, end);
if (pos < end && *pos == 'T') /* YYYYYMMDDHHMMSSThhmmss is supported too */
{
pos++;
digits+= skip_digits(&pos, end);
}
if (pos < end && *pos == '.' && digits >= 12) /* YYYYYMMDDHHMMSShhmmss.uuuuuu is supported too */
{
pos++;
skip_digits(&pos, end); // ignore the return value
}
if (pos == end)
{
/*
Found date in internal format
(only numbers like [YY]YYMMDD[T][hhmmss[.uuuuuu]])
*/
year_length= (digits == 4 || digits == 8 || digits >= 14) ? 4 : 2;
if (get_digits(&l_time->year, &number_of_fields, &str, end, year_length)
|| get_digits(&l_time->month, &number_of_fields, &str, end, 2)
|| get_digits(&l_time->day, &number_of_fields, &str, end, 2)
|| get_maybe_T(&str, end)
|| get_digits(&l_time->hour, &number_of_fields, &str, end, 2)
|| get_digits(&l_time->minute, &number_of_fields, &str, end, 2)
|| get_digits(&l_time->second, &number_of_fields, &str, end, 2))
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
}
else
{
const char *start= str;
if (get_number(&l_time->year, &number_of_fields, &str, end))
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
year_length= str - start;
if (!status->warnings &&
(get_punct(&str, end)
|| get_number(&l_time->month, &number_of_fields, &str, end)
|| get_punct(&str, end)
|| get_number(&l_time->day, &number_of_fields, &str, end)
|| get_date_time_separator(&number_of_fields, flags, &str, end)
|| get_number(&l_time->hour, &number_of_fields, &str, end)
|| get_punct(&str, end)
|| get_number(&l_time->minute, &number_of_fields, &str, end)
|| get_punct(&str, end)
|| get_number(&l_time->second, &number_of_fields, &str, end)))
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
}
/* we're ok if date part is correct. even if the rest is truncated */
if (number_of_fields < 3)
{
l_time->time_type= MYSQL_TIMESTAMP_NONE;
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
DBUG_RETURN(TRUE);
}
if (!status->warnings && str < end && *str == '.')
{
str++;
get_microseconds(&l_time->second_part, status,
&number_of_fields, &str, end);
}
not_zero_date = l_time->year || l_time->month || l_time->day ||
l_time->hour || l_time->minute || l_time->second ||
l_time->second_part;
if (year_length == 2 && not_zero_date)
l_time->year+= (l_time->year < YY_PART_YEAR ? 2000 : 1900);
if (l_time->year > 9999 || l_time->month > 12 || l_time->day > 31 ||
l_time->hour > 23 || l_time->minute > 59 || l_time->second > 59)
{
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
goto err;
}
if (check_date(l_time, not_zero_date, flags, &status->warnings))
goto err;
l_time->time_type= (number_of_fields <= 3 ?
MYSQL_TIMESTAMP_DATE : MYSQL_TIMESTAMP_DATETIME);
for (; str != end ; str++)
{
if (!my_isspace(&my_charset_latin1,*str))
{
status->warnings= MYSQL_TIME_WARN_TRUNCATED;
break;
}
}
DBUG_RETURN(FALSE);
err:
bzero((char*) l_time, sizeof(*l_time));
l_time->time_type= MYSQL_TIMESTAMP_ERROR;
DBUG_RETURN(TRUE);
}
/*
Convert a time string to a MYSQL_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
status Conversion status
NOTES
Because of the extra days argument, this function can only
work with times where the time arguments are in the above order.
status->warnings is set as follows:
MYSQL_TIME_WARN_TRUNCATED if the input string was cut during conversion,
and/or
MYSQL_TIME_WARN_OUT_OF_RANGE flag is set if the value is out of range.
RETURN
FALSE on success
TRUE on error
*/
my_bool str_to_time(const char *str, uint length, MYSQL_TIME *l_time,
ulonglong fuzzydate, MYSQL_TIME_STATUS *status)
{
ulong date[5];
ulonglong value;
const char *end=str+length, *end_of_days;
my_bool found_days,found_hours, neg= 0;
uint UNINIT_VAR(state);
my_time_status_init(status);
for (; str != end && my_isspace(&my_charset_latin1,*str) ; str++)
length--;
if (str != end && *str == '-')
{
neg=1;
str++;
length--;
}
if (str == end)
{
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
goto err;
}
/* Check first if this is a full TIMESTAMP */
if (length >= 12)
{ /* Probably full timestamp */
(void) str_to_datetime(str, length, l_time,
(fuzzydate & ~TIME_TIME_ONLY) | TIME_DATETIME_ONLY,
status);
if (l_time->time_type >= MYSQL_TIMESTAMP_ERROR)
return l_time->time_type == MYSQL_TIMESTAMP_ERROR;
my_time_status_init(status);
}
l_time->neg= neg;
/* 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++)
;
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]= (ulong) 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]= (ulong) value;
state=2;
found_hours=1;
str++; /* skip ':' */
}
else
{
/* String given as one number; assume HHMMSS format */
date[0]= 0;
date[1]= (ulong) (value/10000);
date[2]= (ulong) (value/100 % 100);
date[3]= (ulong) (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++]= (ulong) 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((uchar*) (date+4), (uchar*) (date+state),
sizeof(long)*(state-1));
bzero((uchar*) date, sizeof(long)*(4-state));
}
else
bzero((uchar*) (date+state), sizeof(long)*(4-state));
}
fractional:
/* Get fractional second part */
if (!status->warnings && str < end && *str == '.')
{
uint number_of_fields= 0;
str++;
get_microseconds(&date[4], status, &number_of_fields, &str, end);
}
else
date[4]= 0;
/* Check for exponent part: E<gigit> | E<sign><digit> */
/* (may occur as result of %g formatting of time value) */
if ((end - str) > 1 &&
(*str == 'e' || *str == 'E') &&
(my_isdigit(&my_charset_latin1, str[1]) ||
((str[1] == '-' || str[1] == '+') &&
(end - str) > 2 &&
my_isdigit(&my_charset_latin1, str[2]))))
{
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
goto err;
}
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;
}
}
/* Integer overflow checks */
if (date[0] > UINT_MAX || date[1] > UINT_MAX ||
date[2] > UINT_MAX || date[3] > UINT_MAX ||
date[4] > UINT_MAX)
{
status->warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE;
goto err;
}
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= MYSQL_TIMESTAMP_TIME;
/* Check if the value is valid and fits into MYSQL_TIME range */
if (check_time_range(l_time, 6, &status->warnings))
return TRUE;
/* Check if there is garbage at end of the MYSQL_TIME specification */
if (str != end)
{
do
{
if (!my_isspace(&my_charset_latin1,*str))
{
status->warnings|= MYSQL_TIME_WARN_TRUNCATED;
break;
}
} while (++str != end);
}
return FALSE;
err:
bzero((char*) l_time, sizeof(*l_time));
l_time->time_type= MYSQL_TIMESTAMP_ERROR;
return TRUE;
}
/*
Check 'time' value to lie in the MYSQL_TIME range
SYNOPSIS:
check_time_range()
time pointer to MYSQL_TIME value
uint dec
warning set MYSQL_TIME_WARN_OUT_OF_RANGE flag if the value is out of range
DESCRIPTION
If the time value lies outside of the range [-838:59:59, 838:59:59],
set it to the closest endpoint of the range and set
MYSQL_TIME_WARN_OUT_OF_RANGE flag in the 'warning' variable.
RETURN
0 time value is valid, but was possibly truncated
1 time value is invalid
*/
int check_time_range(struct st_mysql_time *my_time, uint dec, int *warning)
{
longlong hour;
static ulong max_sec_part[TIME_SECOND_PART_DIGITS+1]= {000000, 900000, 990000,
999000, 999900, 999990, 999999};
if (my_time->minute >= 60 || my_time->second >= 60)
{
*warning|= MYSQL_TIME_WARN_TRUNCATED;
return 1;
}
hour= my_time->hour + (24*my_time->day);
if (dec == AUTO_SEC_PART_DIGITS)
dec= TIME_SECOND_PART_DIGITS;
if (hour <= TIME_MAX_HOUR &&
(hour != TIME_MAX_HOUR || my_time->minute != TIME_MAX_MINUTE ||
my_time->second != TIME_MAX_SECOND ||
my_time->second_part <= max_sec_part[dec]))
return 0;
my_time->day= 0;
my_time->hour= TIME_MAX_HOUR;
my_time->minute= TIME_MAX_MINUTE;
my_time->second= TIME_MAX_SECOND;
my_time->second_part= max_sec_part[dec];
*warning|= MYSQL_TIME_WARN_OUT_OF_RANGE;
return 0;
}
/*
Prepare offset of system time zone from UTC for my_system_gmt_sec() func.
SYNOPSIS
my_init_time()
*/
void my_init_time(void)
{
time_t seconds;
struct tm *l_time,tm_tmp;
MYSQL_TIME my_time;
uint 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_time.neg= 0;
my_time.second_part= 0;
my_time.time_type= MYSQL_TIMESTAMP_DATETIME;
my_system_gmt_sec(&my_time, &my_time_zone, &not_used); /* Init my_time_zone */
}
/*
Handle 2 digit year conversions
SYNOPSIS
year_2000_handling()
year 2 digit year
RETURN
Year between 1970-2069
*/
uint year_2000_handling(uint year)
{
if ((year=year+1900) < 1900+YY_PART_YEAR)
year+=100;
return year;
}
/*
Calculate nr of day since year 0 in new date-system (from 1615)
SYNOPSIS
calc_daynr()
year Year (exact 4 digit year, no year conversions)
month Month
day Day
NOTES: 0000-00-00 is a valid date, and will return 0
RETURN
Days since 0000-00-00
*/
long calc_daynr(uint year,uint month,uint day)
{
long delsum;
int temp;
int y= year; /* may be < 0 temporarily */
DBUG_ENTER("calc_daynr");
if (y == 0 && month == 0)
DBUG_RETURN(0); /* Skip errors */
/* Cast to int to be able to handle month == 0 */
delsum= (long) (365 * y + 31 *((int) month - 1) + (int) day);
if (month <= 2)
y--;
else
delsum-= (long) ((int) month * 4 + 23) / 10;
temp=(int) ((y/100+1)*3)/4;
DBUG_PRINT("exit",("year: %d month: %d day: %d -> daynr: %ld",
y+(month <= 2),month,day,delsum+y/4-temp));
DBUG_ASSERT(delsum+(int) y/4-temp >= 0);
DBUG_RETURN(delsum+(int) y/4-temp);
} /* calc_daynr */
/*
Convert time in MYSQL_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
error_code - 0, if the conversion was successful;
ER_WARN_DATA_OUT_OF_RANGE, if t contains datetime value
which is out of TIMESTAMP range;
ER_WARN_INVALID_TIMESTAMP, if t represents value which
doesn't exists (falls into the 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 my_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 MYSQL_TIME *t_src, long *my_timezone, uint *error_code)
{
uint loop;
time_t tmp= 0;
int shift= 0;
MYSQL_TIME tmp_time;
MYSQL_TIME *t= &tmp_time;
struct tm *l_time,tm_tmp;
long diff, current_timezone;
/*
Use temp variable to avoid trashing input data, which could happen in
case of shift required for boundary dates processing.
*/
memcpy(&tmp_time, t_src, sizeof(MYSQL_TIME));
if (!validate_timestamp_range(t))
{
*error_code= ER_WARN_DATA_OUT_OF_RANGE;
return 0;
}
*error_code= 0;
/*
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.
Note: this code assumes that our time_t estimation is not too far away
from real value (we assume that localtime_r(tmp) will return something
within 24 hrs from t) which is probably true for all current time zones.
Note2: For the dates, which have time_t representation close to
MAX_INT32 (efficient time_t limit for supported platforms), we should
do a small trick to avoid overflow. That is, convert the date, which is
two days earlier, and then add these days to the final value.
The same trick is done for the values close to 0 in time_t
representation for platfroms with unsigned time_t (QNX).
To be more verbose, here is a sample (extracted from the code below):
(calc_daynr(2038, 1, 19) - (long) days_at_timestart)*86400L + 4*3600L
would return -2147480896 because of the long type overflow. In result
we would get 1901 year in localtime_r(), which is an obvious error.
Alike problem raises with the dates close to Epoch. E.g.
(calc_daynr(1969, 12, 31) - (long) days_at_timestart)*86400L + 23*3600L
will give -3600.
On some platforms, (E.g. on QNX) time_t is unsigned and localtime(-3600)
wil give us a date around 2106 year. Which is no good.
Theoreticaly, there could be problems with the latter conversion:
there are at least two timezones, which had time switches near 1 Jan
of 1970 (because of political reasons). These are America/Hermosillo and
America/Mazatlan time zones. They changed their offset on
1970-01-01 08:00:00 UTC from UTC-8 to UTC-7. For these zones
the code below will give incorrect results for dates close to
1970-01-01, in the case OS takes into account these historical switches.
Luckily, it seems that we support only one platform with unsigned
time_t. It's QNX. And QNX does not support historical timezone data at all.
E.g. there are no /usr/share/zoneinfo/ files or any other mean to supply
historical information for localtime_r() etc. That is, the problem is not
relevant to QNX.
We are safe with shifts close to MAX_INT32, as there are no known
time switches on Jan 2038 yet :)
*/
if ((t->year == TIMESTAMP_MAX_YEAR) && (t->month == 1) && (t->day > 4))
{
/*
Below we will pass (uint) (t->day - shift) to calc_daynr.
As we don't want to get an overflow here, we will shift
only safe dates. That's why we have (t->day > 4) above.
*/
t->day-= 2;
shift= 2;
}
#ifdef TIME_T_UNSIGNED
else
{
/*
We can get 0 in time_t representaion only on 1969, 31 of Dec or on
1970, 1 of Jan. For both dates we use shift, which is added
to t->day in order to step out a bit from the border.
This is required for platforms, where time_t is unsigned.
As far as I know, among the platforms we support it's only QNX.
Note: the order of below if-statements is significant.
*/
if ((t->year == TIMESTAMP_MIN_YEAR + 1) && (t->month == 1)
&& (t->day <= 10))
{
t->day+= 2;
shift= -2;
}
if ((t->year == TIMESTAMP_MIN_YEAR) && (t->month == 12)
&& (t->day == 31))
{
t->year++;
t->month= 1;
t->day= 2;
shift= -2;
}
}
#endif
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 ||
t->second != (uint) l_time->tm_sec);
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)) +
(long) ((int) t->second - (int) l_time->tm_sec));
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 non existing daylight saving time hour
we move the start of the next real hour.
This code doesn't handle such exotical thing as time-gaps whose length
is more than one hour or non-integer (latter can theoretically happen
if one of seconds will be removed due leap correction, or because of
general time correction like it happened for Africa/Monrovia time zone
in year 1972).
*/
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)) +
(long) ((int) t->second - (int) l_time->tm_sec));
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 */
*error_code= ER_WARN_INVALID_TIMESTAMP;
}
*my_timezone= current_timezone;
/* shift back, if we were dealing with boundary dates */
tmp+= shift*86400L;
/*
This is possible for dates, which slightly exceed boundaries.
Conversion will pass ok for them, but we don't allow them.
First check will pass for platforms with signed time_t.
instruction above (tmp+= shift*86400L) could exceed
MAX_INT32 (== TIMESTAMP_MAX_VALUE) and overflow will happen.
So, tmp < TIMESTAMP_MIN_VALUE will be triggered. On platfroms
with unsigned time_t tmp+= shift*86400L might result in a number,
larger then TIMESTAMP_MAX_VALUE, so another check will work.
*/
if (!IS_TIME_T_VALID_FOR_TIMESTAMP(tmp))
{
tmp= 0;
*error_code= ER_WARN_DATA_OUT_OF_RANGE;
}
return (my_time_t) tmp;
} /* my_system_gmt_sec */
/* Set MYSQL_TIME structure to 0000-00-00 00:00:00.000000 */
void set_zero_time(MYSQL_TIME *tm, enum enum_mysql_timestamp_type time_type)
{
bzero((void*) tm, sizeof(*tm));
tm->time_type= time_type;
}
/*
Helper function for datetime formatting.
Format number as string, left-padded with 0.
The reason to use own formatting rather than sprintf() is performance - in a
datetime benchmark it helped to reduced the datetime formatting overhead
from ~30% down to ~4%.
*/
static char* fmt_number(uint val, char *out, uint digits)
{
uint i;
for(i= 0; i < digits; i++)
{
out[digits-i-1]= '0' + val%10;
val/=10;
}
return out + digits;
}
/*
Functions to convert time/date/datetime value to a string,
using default format.
This functions don't check that given MYSQL_TIME structure members are
in valid range. If they are not, return value won't reflect any
valid date either.
RETURN
number of characters written to 'to'
*/
int my_time_to_str(const MYSQL_TIME *l_time, char *to, uint digits)
{
uint day= (l_time->year || l_time->month) ? 0 : l_time->day;
uint hour= day * 24 + l_time->hour;
char*pos= to;
if (digits == AUTO_SEC_PART_DIGITS)
digits= l_time->second_part ? TIME_SECOND_PART_DIGITS : 0;
DBUG_ASSERT(digits <= TIME_SECOND_PART_DIGITS);
if(l_time->neg)
*pos++= '-';
if(hour > 99)
/* Need more than 2 digits for hours in string representation. */
pos= longlong10_to_str((longlong)hour, pos, 10);
else
pos= fmt_number(hour, pos, 2);
*pos++= ':';
pos= fmt_number(l_time->minute, pos, 2);
*pos++= ':';
pos= fmt_number(l_time->second, pos, 2);
if (digits)
{
*pos++= '.';
pos= fmt_number((uint)sec_part_shift(l_time->second_part, digits),
pos, digits);
}
*pos= 0;
return (int) (pos-to);
}
int my_date_to_str(const MYSQL_TIME *l_time, char *to)
{
char *pos=to;
pos= fmt_number(l_time->year, pos, 4);
*pos++='-';
pos= fmt_number(l_time->month, pos, 2);
*pos++='-';
pos= fmt_number(l_time->day, pos, 2);
*pos= 0;
return (int)(pos - to);
}
int my_datetime_to_str(const MYSQL_TIME *l_time, char *to, uint digits)
{
char *pos= to;
if (digits == AUTO_SEC_PART_DIGITS)
digits= l_time->second_part ? TIME_SECOND_PART_DIGITS : 0;
DBUG_ASSERT(digits <= TIME_SECOND_PART_DIGITS);
pos= fmt_number(l_time->year, pos, 4);
*pos++='-';
pos= fmt_number(l_time->month, pos, 2);
*pos++='-';
pos= fmt_number(l_time->day, pos, 2);
*pos++=' ';
pos= fmt_number(l_time->hour, pos, 2);
*pos++= ':';
pos= fmt_number(l_time->minute, pos, 2);
*pos++= ':';
pos= fmt_number(l_time->second, pos, 2);
if (digits)
{
*pos++='.';
pos= fmt_number((uint) sec_part_shift(l_time->second_part, digits), pos,
digits);
}
*pos= 0;
return (int)(pos - to);
}
/*
Convert struct DATE/TIME/DATETIME value to string using built-in
MySQL time conversion formats.
SYNOPSIS
my_TIME_to_string()
RETURN
length of string
NOTE
The string must have at least MAX_DATE_STRING_REP_LENGTH bytes reserved.
*/
int my_TIME_to_str(const MYSQL_TIME *l_time, char *to, uint digits)
{
switch (l_time->time_type) {
case MYSQL_TIMESTAMP_DATETIME:
return my_datetime_to_str(l_time, to, digits);
case MYSQL_TIMESTAMP_DATE:
return my_date_to_str(l_time, to);
case MYSQL_TIMESTAMP_TIME:
return my_time_to_str(l_time, to, digits);
case MYSQL_TIMESTAMP_NONE:
case MYSQL_TIMESTAMP_ERROR:
to[0]='\0';
return 0;
default:
DBUG_ASSERT(0);
return 0;
}
}
/**
Print a timestamp with an optional fractional part: XXXXX[.YYYYY]
@param tm The timestamp value to print.
@param OUT to The string pointer to print at.
@param dec Precision, in the range 0..6.
@return The length of the result string.
*/
int my_timeval_to_str(const struct timeval *tm, char *to, uint dec)
{
char *pos= longlong10_to_str((longlong) tm->tv_sec, to, 10);
if (dec)
{
*pos++= '.';
pos= fmt_number((uint) sec_part_shift(tm->tv_usec, dec), pos, dec);
}
*pos= '\0';
return (int) (pos - to);
}
/*
Convert datetime value specified as number to broken-down TIME
representation and form value of DATETIME type as side-effect.
SYNOPSIS
number_to_datetime()
nr - datetime value as number
time_res - pointer for structure for broken-down representation
flags - flags to use in validating date, as in str_to_datetime()
was_cut 0 Value ok
1 If value was cut during conversion
2 check_date(date,flags) considers date invalid
DESCRIPTION
Convert a datetime value of formats YYMMDD, YYYYMMDD, YYMMDDHHMSS,
YYYYMMDDHHMMSS to broken-down MYSQL_TIME representation. Return value in
YYYYMMDDHHMMSS format as side-effect.
This function also checks if datetime value fits in DATETIME range.
RETURN VALUE
-1 Timestamp with wrong values
anything else DATETIME as integer in YYYYMMDDHHMMSS format
Datetime value in YYYYMMDDHHMMSS format.
*/
longlong number_to_datetime(longlong nr, ulong sec_part, MYSQL_TIME *time_res,
ulonglong flags, int *was_cut)
{
long part1,part2;
*was_cut= 0;
time_res->time_type=MYSQL_TIMESTAMP_DATE;
if (nr == 0 || nr >= 10000101000000LL || sec_part)
{
time_res->time_type=MYSQL_TIMESTAMP_DATETIME;
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;
time_res->time_type=MYSQL_TIMESTAMP_DATETIME;
if (nr <= (YY_PART_YEAR-1)*10000000000LL+1231235959LL)
{
nr= nr+20000000000000LL; /* YYMMDDHHMMSS, 2000-2069 */
goto ok;
}
if (nr < YY_PART_YEAR*10000000000LL+ 101000000LL)
goto err;
if (nr <= 991231235959LL)
nr= nr+19000000000000LL; /* YYMMDDHHMMSS, 1970-1999 */
ok:
part1=(long) (nr/1000000LL);
part2=(long) (nr - (longlong) part1*1000000LL);
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;
time_res->second_part= sec_part;
time_res->neg= 0;
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 &&
sec_part <= TIME_MAX_SECOND_PART &&
!check_date(time_res, nr || sec_part, flags, was_cut))
return nr;
/* Don't want to have was_cut get set if NO_ZERO_DATE was violated. */
if (nr || !(flags & TIME_NO_ZERO_DATE))
*was_cut= 1;
return -1;
err:
{
/* reset everything except time_type */
enum enum_mysql_timestamp_type save= time_res->time_type;
bzero((char*) time_res, sizeof(*time_res));
time_res->time_type= save; /* Restore range */
*was_cut= 1; /* Found invalid date */
}
return -1;
}
/*
Convert a pair of integers to a MYSQL_TIME struct.
@param[in] nr a number to convert
@param[out] ltime Date to check.
@param[out] was_cut MYSQL_TIME_WARN_OUT_OF_RANGE if the value was
modified to fit in the valid range. Otherwise 0.
@details
Takes a number in the [-]HHHMMSS.uuuuuu,
YYMMDDHHMMSS.uuuuuu, or in the YYYYMMDDHHMMSS.uuuuuu formats.
@return
0 time value is valid, but was possibly truncated
-1 time value is invalid
*/
int number_to_time(my_bool neg, longlong nr, ulong sec_part,
MYSQL_TIME *ltime, int *was_cut)
{
if (nr > 9999999 && neg == 0)
{
if (number_to_datetime(nr, sec_part, ltime,
TIME_INVALID_DATES, was_cut) < 0)
return -1;
ltime->year= ltime->month= ltime->day= 0;
ltime->time_type= MYSQL_TIMESTAMP_TIME;
*was_cut= MYSQL_TIME_WARN_TRUNCATED;
return 0;
}
*was_cut= 0;
ltime->year= ltime->month= ltime->day= 0;
ltime->time_type= MYSQL_TIMESTAMP_TIME;
ltime->neg= neg;
if (nr > TIME_MAX_VALUE)
{
nr= TIME_MAX_VALUE;
sec_part= TIME_MAX_SECOND_PART;
*was_cut= MYSQL_TIME_WARN_OUT_OF_RANGE;
}
ltime->hour = (uint)(nr/100/100);
ltime->minute= nr/100%100;
ltime->second= nr%100;
ltime->second_part= sec_part;
if (ltime->minute < 60 && ltime->second < 60 && sec_part <= TIME_MAX_SECOND_PART)
return 0;
*was_cut= MYSQL_TIME_WARN_TRUNCATED;
return -1;
}
/* Convert time value to integer in YYYYMMDDHHMMSS format */
ulonglong TIME_to_ulonglong_datetime(const MYSQL_TIME *my_time)
{
return ((ulonglong) (my_time->year * 10000UL +
my_time->month * 100UL +
my_time->day) * 1000000ULL +
(ulonglong) (my_time->hour * 10000UL +
my_time->minute * 100UL +
my_time->second));
}
/* Convert MYSQL_TIME value to integer in YYYYMMDD format */
ulonglong TIME_to_ulonglong_date(const MYSQL_TIME *my_time)
{
return (ulonglong) (my_time->year * 10000UL + my_time->month * 100UL +
my_time->day);
}
/*
Convert MYSQL_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 MYSQL_TIME *my_time)
{
return (ulonglong) (my_time->hour * 10000UL +
my_time->minute * 100UL +
my_time->second);
}
/*
Convert struct MYSQL_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, CURTIME()+0;
SELECT ?+1;
NOTE
This function doesn't check that given MYSQL_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 MYSQL_TIME *my_time)
{
switch (my_time->time_type) {
case MYSQL_TIMESTAMP_DATETIME:
return TIME_to_ulonglong_datetime(my_time);
case MYSQL_TIMESTAMP_DATE:
return TIME_to_ulonglong_date(my_time);
case MYSQL_TIMESTAMP_TIME:
return TIME_to_ulonglong_time(my_time);
case MYSQL_TIMESTAMP_NONE:
case MYSQL_TIMESTAMP_ERROR:
return 0;
default:
DBUG_ASSERT(0);
}
return 0;
}
double TIME_to_double(const MYSQL_TIME *my_time)
{
double d= (double)TIME_to_ulonglong(my_time);
if (my_time->time_type == MYSQL_TIMESTAMP_DATE)
return d;
d+= my_time->second_part/(double)TIME_SECOND_PART_FACTOR;
return my_time->neg ? -d : d;
}
longlong pack_time(const MYSQL_TIME *my_time)
{
return ((((((my_time->year * 13ULL +
my_time->month) * 32ULL +
my_time->day) * 24ULL +
my_time->hour) * 60ULL +
my_time->minute) * 60ULL +
my_time->second) * 1000000ULL +
my_time->second_part) * (my_time->neg ? -1 : 1);
}
#define get_one(WHERE, FACTOR) WHERE= (ulong)(packed % FACTOR); packed/= FACTOR
MYSQL_TIME *unpack_time(longlong packed, MYSQL_TIME *my_time)
{
if ((my_time->neg= packed < 0))
packed= -packed;
get_one(my_time->second_part, 1000000ULL);
get_one(my_time->second, 60ULL);
get_one(my_time->minute, 60ULL);
get_one(my_time->hour, 24ULL);
get_one(my_time->day, 32ULL);
get_one(my_time->month, 13ULL);
my_time->year= (uint)packed;
my_time->time_type= MYSQL_TIMESTAMP_DATETIME;
return my_time;
}
Reference in a new issue View git blame Copy permalink