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Diffstat (limited to '')
| -rw-r--r-- | sql-common/my_time.c | 2022 |
1 files changed, 2022 insertions, 0 deletions
diff --git a/sql-common/my_time.c b/sql-common/my_time.c new file mode 100644 index 00000000..96674723 --- /dev/null +++ b/sql-common/my_time.c @@ -0,0 +1,2022 @@ +/* + Copyright (c) 2004, 2012, Oracle and/or its affiliates. + Copyright (c) 2010, 2017, MariaDB Corporation. + + 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 02110-1335 USA */ + +#include <my_global.h> +#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> + + +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); +} + + +#ifdef DBUG_ASSERT_EXISTS + + +static const ulonglong C_KNOWN_FLAGS= C_TIME_NO_ZERO_IN_DATE | + C_TIME_NO_ZERO_DATE | + C_TIME_INVALID_DATES; + +#define C_FLAGS_OK(flags) (((flags) & ~C_KNOWN_FLAGS) == 0) + +#endif + + +/** + @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) +{ + DBUG_ASSERT(C_FLAGS_OK(flags)); + if (ltime->time_type == MYSQL_TIMESTAMP_TIME) + return FALSE; + if (not_zero_date) + { + if (((flags & C_TIME_NO_ZERO_IN_DATE) && + (ltime->month == 0 || ltime->day == 0)) || ltime->neg || + (!(flags & C_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 & C_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 + */ + *was_cut|= MYSQL_TIME_WARN_ZERO_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, MY_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, + my_bool punct_is_date_time_separator, + 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 "punct_is_date_time_separator" is set. + */ + if (my_ispunct(&my_charset_latin1, *s)) + { + if (!punct_is_date_time_separator) + { + /* 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 (s < end && 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 (uint)(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 > + (uint) (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= (uint)(*str - start)) < 6) + *val= (ulong) (tmp * log_10_int[6 - (*str - start)]); + else + *val= tmp; + if (str[0] < end && my_isdigit(&my_charset_latin1, str[0][0])) + { + /* + We don't need the exact nanoseconds value. + Knowing the first digit is enough for rounding. + */ + status->nanoseconds= 100 * (uint)(str[0][0] - '0'); + } + if (skip_digits(str, end)) + status->warnings|= MYSQL_TIME_NOTE_TRUNCATED; +} + + +static int check_time_range_internal(MYSQL_TIME *ltime, + ulong max_hour, ulong err_hour, + uint dec, int *warning); + +int check_time_range(MYSQL_TIME *ltime, uint dec, int *warning) +{ + return check_time_range_internal(ltime, TIME_MAX_HOUR, UINT_MAX32, + dec, warning); +} + + +static my_bool +set_neg(my_bool neg, MYSQL_TIME_STATUS *st, MYSQL_TIME *ltime) +{ + if ((ltime->neg= neg) && ltime->time_type != MYSQL_TIMESTAMP_TIME) + { + st->warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE; + return TRUE; + } + return FALSE; +} + + + /* Remove trailing spaces and garbage */ +static my_bool get_suffix(const char *str, size_t length, size_t *new_length) +{ + /* + QQ: perhaps 'T' should be considered as a date/time delimiter only + if it's followed by a digit. Learn ISO 8601 details. + */ + my_bool garbage= FALSE; + for ( ; length > 0 ; length--) + { + char ch= str[length - 1]; + if (my_isdigit(&my_charset_latin1, ch) || + my_ispunct(&my_charset_latin1, ch)) + break; + if (my_isspace(&my_charset_latin1, ch)) + continue; + if (ch == 'T') + { + /* 'T' has a meaning only after a digit. Otherwise it's a garbage */ + if (length >= 2 && my_isdigit(&my_charset_latin1, str[length - 2])) + break; + } + garbage= TRUE; + } + *new_length= length; + return garbage; +} + + +static size_t get_prefix(const char *str, size_t length, const char **endptr) +{ + const char *str0= str, *end= str + length; + for (; str < end && my_isspace(&my_charset_latin1, *str) ; str++) + { } + *endptr= str; + return str - str0; +} + + +static size_t get_sign(my_bool *neg, const char *str, size_t length, + const char **endptr) +{ + const char *str0= str; + if (length) + { + if ((*neg= (*str == '-')) || (*str == '+')) + str++; + } + else + *neg= FALSE; + *endptr= str; + return str - str0; +} + + +static my_bool find_body(my_bool *neg, const char *str, size_t length, + MYSQL_TIME *to, int *warn, + const char **new_str, size_t *new_length) +{ + size_t sign_length; + *warn= 0; + length-= get_prefix(str, length, &str); + sign_length= get_sign(neg, str, length, &str); + length-= sign_length; + /* There can be a space after a sign again: '- 10:20:30' or '- 1 10:20:30' */ + length-= get_prefix(str, length, &str); + if (get_suffix(str, length, &length)) + *warn|= MYSQL_TIME_WARN_TRUNCATED; + *new_str= str; + *new_length= length; + if (!length || !my_isdigit(&my_charset_latin1, *str)) + { + *warn|= MYSQL_TIME_WARN_EDOM; + set_zero_time(to, MYSQL_TIMESTAMP_ERROR); + return TRUE; + } + return FALSE; +} + + +typedef struct +{ + uint count_punct; + uint count_colon; + uint count_iso_date_time_separator; +} MYSQL_TIME_USED_CHAR_STATISTICS; + + +static void +mysql_time_used_char_statistics_init(MYSQL_TIME_USED_CHAR_STATISTICS *to, + const char *str, const char *end) +{ + const char *s; + bzero((void *) to, sizeof(MYSQL_TIME_USED_CHAR_STATISTICS)); + for (s= str; s < end; s++) + { + if (my_ispunct(&my_charset_latin1, *s)) + to->count_punct++; + if (*s == ':') + to->count_colon++; + if (*s == 'T') + to->count_iso_date_time_separator++; + } +} + + +static my_bool +is_datetime_body_candidate(const char *str, size_t length, + my_bool allow_dates_delimited, + my_bool allow_dates_numeric) +{ + static uint min_date_length= 5; /* '1-1-1' -> '0001-01-01' */ + uint pos, count_punct= 0; + uint date_time_separator_length= MY_TEST(!allow_dates_delimited); + if (length >= 12) + return TRUE; + /* + The shortest possible DATE is '1-1-1', which is 5 characters. + To make a full datetime it should be at least followed by a space or a 'T'. + To make a date it should be just not less that 5 characters. + */ + if (length < min_date_length + date_time_separator_length && + !allow_dates_numeric) + return FALSE; + for (pos= 0; pos < length; pos++) + { + if (str[pos] == 'T') /* Date/time separator */ + return TRUE; + if (str[pos] == ' ') + { + /* + We found a space. If can be a DATE/TIME separator: + TIME('1-1-1 1:1:1.0) -> '0001-01-01 01:01:01.0' + + But it can be also a DAY/TIME separator: + TIME('1 11') -> 35:00:00 = 1 day 11 hours + TIME('1 111') -> 135:00:00 = 1 day 111 hours + TIME('11 11') -> 275:00:00 = 11 days 11 hours + TIME('111 11') -> 838:59:59 = 111 days 11 hours with overflow + TIME('1111 11') -> 838:59:59 = 1111 days 11 hours with overflow + */ + return count_punct > 0; /* Can be a DATE if already had separators*/ + } + if (my_ispunct(&my_charset_latin1, str[pos])) + { + if (allow_dates_delimited && str[pos] != ':') + return TRUE; + count_punct++; + } + } + return allow_dates_numeric && count_punct == 0; +} + + +static my_bool +str_to_DDhhmmssff_internal(my_bool neg, const char *str, size_t length, + MYSQL_TIME *l_time, + ulong max_hour, ulong err_hour, + MYSQL_TIME_STATUS *status, + const char **endptr); + + +/* + Convert a timestamp string to a MYSQL_TIME value. + + SYNOPSIS + str_to_datetime_or_date_body() + str String to parse + length Length of string + l_time Date is stored here + flags Bitmap of following items + 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 + punct_is_date_time_separator + Allow punctuation as a date/time separator, + or return a hard error. + 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 + +static my_bool +str_to_datetime_or_date_body(const char *str, size_t length, MYSQL_TIME *l_time, + ulonglong flags, + my_bool punct_is_date_time_separator, + MYSQL_TIME_STATUS *status, + uint *number_of_fields, + const char **endptr) +{ + const char *end=str+length, *pos; + uint digits, year_length, not_zero_date; + int warn= 0; + DBUG_ENTER("str_to_datetime_or_date_body"); + DBUG_ASSERT(C_FLAGS_OK(flags)); + bzero(l_time, sizeof(*l_time)); + *number_of_fields= 0; + *endptr= str; + + /* + 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)) + warn|= MYSQL_TIME_WARN_TRUNCATED; + } + else + { + const char *start= str; + if (get_number(&l_time->year, number_of_fields, &str, end)) + warn|= MYSQL_TIME_WARN_TRUNCATED; + year_length= (uint)(str - start); + + if (!warn && + (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, + punct_is_date_time_separator, &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))) + warn|= MYSQL_TIME_WARN_TRUNCATED; + } + status->warnings|= warn; + + *endptr= str; + /* 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 (!warn && str < end && *str == '.') + { + str++; + get_microseconds(&l_time->second_part, status, + number_of_fields, &str, end); + *endptr= str; + } + + 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); + + if (str != end) + status->warnings= MYSQL_TIME_WARN_TRUNCATED; + + DBUG_RETURN(FALSE); + +err: + set_zero_time(l_time, MYSQL_TIMESTAMP_ERROR); + DBUG_RETURN(TRUE); +} + + +/* + Convert a time string to a MYSQL_TIME struct. + + SYNOPSIS + str_to_datetime_or_date_or_time_body() + 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 +*/ + +static my_bool +str_to_datetime_or_date_or_time_body(const char *str, size_t length, + MYSQL_TIME *l_time, + ulonglong fuzzydate, + MYSQL_TIME_STATUS *status, + ulong time_max_hour, + ulong time_err_hour, + my_bool allow_dates_delimited, + my_bool allow_dates_numeric) +{ + const char *endptr; + DBUG_ASSERT(C_FLAGS_OK(fuzzydate)); + + /* Check first if this is a full TIMESTAMP */ + if (is_datetime_body_candidate(str, length, + allow_dates_delimited, + allow_dates_numeric)) + { /* Probably full timestamp */ + int warn_copy= status->warnings; /* could already be set by find_body() */ + uint number_of_fields; + (void) str_to_datetime_or_date_body(str, length, l_time, fuzzydate, + FALSE, status, + &number_of_fields, &endptr); + DBUG_ASSERT(endptr >= str); + DBUG_ASSERT(endptr <= str + length); + switch (l_time->time_type) { + case MYSQL_TIMESTAMP_DATETIME: + return FALSE; + case MYSQL_TIMESTAMP_DATE: + { + /* + Successfully parsed as DATE, but it can also be a TIME: + '24:02:03' - continue and parse as TIME + '24:02:03 garbage /////' - continue and parse as TIME + '24:02:03T' - return DATE + '24-02-03' - return DATE + '24/02/03' - return DATE + '11111' - return DATE + */ + MYSQL_TIME_USED_CHAR_STATISTICS used_chars; + mysql_time_used_char_statistics_init(&used_chars, str, endptr); + if (used_chars.count_iso_date_time_separator || !used_chars.count_colon) + return FALSE; + } + break; + case MYSQL_TIMESTAMP_ERROR: + { + MYSQL_TIME_USED_CHAR_STATISTICS used_chars; + /* + Check if it parsed as DATETIME but then failed as out of range: + '2011-02-32 8:46:06.23434' - return error + */ + if (number_of_fields > 3) + return TRUE; + /* + Check if it parsed as DATE but then failed as out of range: + '100000:02:03' - continue and parse as TIME + '100000:02:03T' - return error + '100000/02/03' - return error + '100000-02-03' - return error + */ + mysql_time_used_char_statistics_init(&used_chars, str, endptr); + if (used_chars.count_iso_date_time_separator || !used_chars.count_colon) + return TRUE; + } + break; + case MYSQL_TIMESTAMP_NONE: + { + if (allow_dates_numeric && endptr >= str + length) + { + /* + For backward compatibility this parses as DATE and fails: + EXTRACT(DAY FROM '1111') -- return error + EXTRACT(DAY FROM '1') -- return error + */ + MYSQL_TIME_USED_CHAR_STATISTICS used_chars; + mysql_time_used_char_statistics_init(&used_chars, str, endptr); + if (!used_chars.count_iso_date_time_separator && + !used_chars.count_colon && + !used_chars.count_punct) + return TRUE; + } + /* + - '256 10:30:30' - continue and parse as TIME + - '4294967296:59:59.123456456' - continue and parse as TIME + */ + } + break; + case MYSQL_TIMESTAMP_TIME: + DBUG_ASSERT(0); + break; + } + my_time_status_init(status); + status->warnings= warn_copy; + } + + if (!str_to_DDhhmmssff_internal(FALSE, str, length, l_time, + time_max_hour, time_err_hour, + status, &endptr)) + return FALSE; + + set_zero_time(l_time, MYSQL_TIMESTAMP_ERROR); + return TRUE; +} + + +/* + Convert a string with INTERVAL DAY TO SECOND to MYSQL_TIME. + Input format: [-][DD ]hh:mm:ss.ffffff + + If the input string appears to be a DATETIME, error is returned. +*/ +my_bool str_to_DDhhmmssff(const char *str, size_t length, MYSQL_TIME *ltime, + ulong max_hour, MYSQL_TIME_STATUS *status) +{ + my_bool neg; + const char *endptr; + + my_time_status_init(status); + if (find_body(&neg, str, length, ltime, &status->warnings, &str, &length)) + return TRUE; + + /* Reject anything that might be parsed as a full TIMESTAMP */ + if (is_datetime_body_candidate(str, length, FALSE, FALSE)) + { + uint number_of_fields; + (void) str_to_datetime_or_date_body(str, length, ltime, 0, FALSE, + status, &number_of_fields, &endptr); + if (ltime->time_type > MYSQL_TIMESTAMP_ERROR) + { + status->warnings|= MYSQL_TIME_WARN_TRUNCATED; + ltime->time_type= MYSQL_TIMESTAMP_NONE; + return TRUE; + } + my_time_status_init(status); + } + + /* + Scan DDhhmmssff then reject anything that can remind date/datetime. + For example, in case of '2001-01-01', str_to_DDhhmmssff_internal() + will scan only '2001'. + */ + if (str_to_DDhhmmssff_internal(neg, str, length, ltime, max_hour, + UINT_MAX32, status, &endptr) || + (endptr < str + length && endptr[0] == '-')) + return TRUE; + return FALSE; +} + + +my_bool +str_to_datetime_or_date_or_time(const char *str, size_t length, + MYSQL_TIME *to, ulonglong mode, + MYSQL_TIME_STATUS *status, + ulong time_max_hour, + ulong time_err_hour) +{ + my_bool neg; + DBUG_ASSERT(C_FLAGS_OK(mode)); + my_time_status_init(status); + return + find_body(&neg, str, length, to, &status->warnings, &str, &length) || + str_to_datetime_or_date_or_time_body(str, length, to, mode, status, + time_max_hour, time_err_hour, + FALSE, FALSE) || + set_neg(neg, status, to); +} + + +my_bool +str_to_datetime_or_date_or_interval_hhmmssff(const char *str, size_t length, + MYSQL_TIME *to, ulonglong mode, + MYSQL_TIME_STATUS *status, + ulong time_max_hour, + ulong time_err_hour) +{ + my_bool neg; + DBUG_ASSERT(C_FLAGS_OK(mode)); + my_time_status_init(status); + return + find_body(&neg, str, length, to, &status->warnings, &str, &length) || + str_to_datetime_or_date_or_time_body(str, length, to, mode, status, + time_max_hour, time_err_hour, + TRUE, FALSE) || + set_neg(neg, status, to); +} + + +my_bool +str_to_datetime_or_date_or_interval_day(const char *str, size_t length, + MYSQL_TIME *to, ulonglong mode, + MYSQL_TIME_STATUS *status, + ulong time_max_hour, + ulong time_err_hour) +{ + my_bool neg; + DBUG_ASSERT(C_FLAGS_OK(mode)); + my_time_status_init(status); + /* + For backward compatibility we allow to parse non-delimited + values as DATE rather than as TIME: + EXTRACT(DAY FROM '11111') + */ + return + find_body(&neg, str, length, to, &status->warnings, &str, &length) || + str_to_datetime_or_date_or_time_body(str, length, to, mode, status, + time_max_hour, time_err_hour, + TRUE, TRUE) || + set_neg(neg, status, to); +} + + +my_bool +str_to_datetime_or_date(const char *str, size_t length, MYSQL_TIME *l_time, + ulonglong flags, MYSQL_TIME_STATUS *status) +{ + my_bool neg; + uint number_of_fields; + const char *endptr; + DBUG_ASSERT(C_FLAGS_OK(flags)); + my_time_status_init(status); + return + find_body(&neg, str, length, l_time, &status->warnings, &str, &length) || + str_to_datetime_or_date_body(str, length, l_time, flags, TRUE, + status, &number_of_fields, &endptr) || + set_neg(neg, status, l_time); +} + + + +/** + Convert a string to INTERVAL DAY TO SECOND. + Input format: [DD ]hh:mm:ss.ffffff + + Datetime or date formats are not understood. + + Optional leading spaces and signs must be scanned by the caller. + "str" should point to the first digit. + + @param neg - set the value to be negative + @param str - the input string + @param length - length of "str" + @param[OUT] l_time - write the result here + @param max_hour - if the result hour value appears to be greater than + max_hour, then cut to result to 'max_hour:59:59.999999' + @param err_hour - if the hour appears to be greater than err_hour, + return an error (without cut) + @param status + @param endptr +*/ +static my_bool +str_to_DDhhmmssff_internal(my_bool neg, const char *str, size_t length, + MYSQL_TIME *l_time, + ulong max_hour, ulong err_hour, + MYSQL_TIME_STATUS *status, const char **endptr) +{ + ulong date[5]; + ulonglong value; + const char *end=str + length, *end_of_days; + my_bool found_days, found_hours; + uint UNINIT_VAR(state); + + *endptr= str; + 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'); + if (value >= 42949672955959ULL) /* i.e. UINT_MAX32 : 59 : 59 */ + { + status->warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE; + goto err; + } + } + + /* 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 */ + if (value >= UINT_MAX32) + { + status->warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE; + goto err; + } + date[1]= (ulong) value; + state=2; + found_hours=1; + str++; /* skip ':' */ + } + else + { + /* String given as one number; assume HHMMSS format */ + date[0]= 0; + DBUG_ASSERT(value <= ((ulonglong) UINT_MAX32) * 10000ULL); + 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 (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; + } + + if ((ulonglong) date[0] * 24 + date[1] > (ulonglong) UINT_MAX32) + { + 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= 0; + l_time->hour= date[1] + date[0] * 24; /* Mix days and hours */ + l_time->minute= date[2]; + l_time->second= date[3]; + l_time->second_part= date[4]; + l_time->time_type= MYSQL_TIMESTAMP_TIME; + + *endptr= str; + + /* Check if the value is valid and fits into MYSQL_TIME range */ + if (check_time_range_internal(l_time, max_hour, err_hour, + 6, &status->warnings)) + return TRUE; + + /* Check if there is garbage at end of the MYSQL_TIME specification */ + if (str != end) + status->warnings|= MYSQL_TIME_WARN_TRUNCATED; + return FALSE; + +err: + *endptr= str; + return TRUE; +} + + +/* + Check 'time' value to lie in the MYSQL_TIME range + + SYNOPSIS: + check_time_range_internal() + time pointer to MYSQL_TIME value + ulong max_hour - maximum allowed hour value. if the hour is greater, + cut the time value to 'max_hour:59:59.999999' + ulong err_hour - if hour is greater than this value, return an error + 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_internal(struct st_mysql_time *my_time, + ulong max_hour, ulong err_hour, + uint dec, int *warning) +{ + ulonglong 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 || + my_time->hour > err_hour) + { + *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 <= max_hour && + (hour != 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= 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, ¬_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) * SECONDS_IN_24H + + (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 * SECONDS_IN_24H; + + /* + 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; +} + + +/* + A formatting routine to print a 2 digit zero padded number. + It prints 2 digits at a time, which gives a performance improvement. + The idea is taken from "class TwoDigitWriter" in MySQL. + + The old implementation printed one digit at a time, using the division + and the remainder operators, which appeared to be slow. + It's cheaper to have a cached array of 2-digit numbers + in their string representation. + + Benchmark results showed a 10% to 23% time reduce for these queries: + SELECT BENCHMARK(10*1000*1000,CONCAT(TIME'10:20:30')); + SELECT BENCHMARK(10*1000*1000,CONCAT(DATE'2001-01-01')); + SELECT BENCHMARK(10*1000*1000,CONCAT(TIMESTAMP'2001-01-01 10:20:30')); + SELECT BENCHMARK(10*1000*1000,CONCAT(TIME'10:20:30.123456')); + SELECT BENCHMARK(10*1000*1000,CONCAT(TIMESTAMP'2001-01-01 10:20:30.123456')); + (depending on the exact data type and fractional precision). + + The array has extra elements for values 100..255. + This is done for safety. If the caller passes a value + outside of the expected range 0..99, the value will be printed as "XX". + + Part2: + + As an additional improvement over "class TwoDigitWriter", we store + the string representations of the numbers in an array uint16[256] + instead of char[512]. This allows to copy data using int2store(), + which copies two bytes at a time on x86 and gives an additional + 7% to 26% time reduce over copying the two bytes separately. + + The total time reduce is 15% to 38% on the above queries. + + The bytes in the following array are swapped: + e.g. 0x3130 in two_digit_numbers[1] means the following: + - 0x31 is '1' (the left byte, the right digit) + - 0x30 is '0' (the right byte, the left digit) + int2store() puts the lower byte first, so the output string becomes '01'. +*/ +static const uint16 two_digit_numbers[256]= +{ + /* 0..99 */ + 0x3030,0x3130,0x3230,0x3330,0x3430,0x3530,0x3630,0x3730,0x3830,0x3930, + 0x3031,0x3131,0x3231,0x3331,0x3431,0x3531,0x3631,0x3731,0x3831,0x3931, + 0x3032,0x3132,0x3232,0x3332,0x3432,0x3532,0x3632,0x3732,0x3832,0x3932, + 0x3033,0x3133,0x3233,0x3333,0x3433,0x3533,0x3633,0x3733,0x3833,0x3933, + 0x3034,0x3134,0x3234,0x3334,0x3434,0x3534,0x3634,0x3734,0x3834,0x3934, + 0x3035,0x3135,0x3235,0x3335,0x3435,0x3535,0x3635,0x3735,0x3835,0x3935, + 0x3036,0x3136,0x3236,0x3336,0x3436,0x3536,0x3636,0x3736,0x3836,0x3936, + 0x3037,0x3137,0x3237,0x3337,0x3437,0x3537,0x3637,0x3737,0x3837,0x3937, + 0x3038,0x3138,0x3238,0x3338,0x3438,0x3538,0x3638,0x3738,0x3838,0x3938, + 0x3039,0x3139,0x3239,0x3339,0x3439,0x3539,0x3639,0x3739,0x3839,0x3939, + /* 100..199 - safety */ + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + /* 200..255 - safety */ + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, + 0x5858,0x5858,0x5858,0x5858,0x5858,0x5858, +}; + +static inline char* fmt_number2(uint8 val, char *out) +{ + int2store(out, two_digit_numbers[val]); + return out + 2; +} + + +/* + We tried the same trick with a char array of 16384 zerofill 4-digit numbers, + with 10000 elements with numbers 0000..9999, and a tail filled with "XXXX". + + Benchmark results for a RelWithDebInfo build: + + SELECT BENCHMARK(10*1000*1000,CONCAT(TIMESTAMP'2001-01-01 10:20:30.123456')); + - 0.379 sec (current) + - 0.369 sec (array) + + SELECT BENCHMARK(10*1000*1000,CONCAT(DATE'2001-01-01')); + - 0.225 sec (current) + - 0.219 sec (array) + + It demonstrated an additional 3% performance imrovement one these queries. + However, as the array size is too huge, we afraid that it will flush data + from the CPU memory cache, which under real load may affect negatively. + + Let's keep using the fmt_number4() version with division and remainder + for now. This can be revised later. We could try some smaller array, + e.g. for YEARs in the range 1970..2098 (fitting into a 256 element array). +*/ +/* +static inline char* fmt_number4(uint16 val, char *out) +{ + const char *src= four_digit_numbers + (val & 0x3FFF) * 4; + memcpy(out, src, 4); + return out + 4; +} +*/ + + +/* + A formatting routine to print a 4 digit zero padded number. +*/ +static inline char* fmt_number4(uint16 val, char *out) +{ + out= fmt_number2((uint8) (val / 100), out); + out= fmt_number2((uint8) (val % 100), out); + return out; +} + + +/* + A formatting routine to print a 6 digit zero padded number. +*/ +static inline char* fmt_number6(uint val, char *out) +{ + out= fmt_number2((uint8) (val / 10000), out); + val%= 10000; + out= fmt_number2((uint8) (val / 100), out); + out= fmt_number2((uint8) (val % 100), out); + return out; +} + + +static char* fmt_usec(uint val, char *out, uint digits) +{ + switch (digits) + { + case 1: + *out++= '0' + (val % 10); + return out; + case 2: + return fmt_number2((uint8) val, out); + case 3: + *out++= '0' + (val / 100) % 10; + return fmt_number2((uint8) (val % 100), out); + case 4: + return fmt_number4((uint16) val, out); + case 5: + *out++= '0' + (val / 10000) % 10; + return fmt_number4((uint16) (val % 10000), out); + case 6: + return fmt_number6(val, out); + } + DBUG_ASSERT(0); + return out; +} + + +static int my_mmssff_to_str(const MYSQL_TIME *ltime, char *to, uint fsp) +{ + char *pos= to; + if (fsp == AUTO_SEC_PART_DIGITS) + fsp= ltime->second_part ? TIME_SECOND_PART_DIGITS : 0; + DBUG_ASSERT(fsp <= TIME_SECOND_PART_DIGITS); + pos= fmt_number2((uint8) ltime->minute, pos); + *pos++= ':'; + pos= fmt_number2((uint8) ltime->second, pos); + if (fsp) + { + *pos++= '.'; + pos= fmt_usec((uint)sec_part_shift(ltime->second_part, fsp), pos, fsp); + } + return (int) (pos - to); +} + + +int my_interval_DDhhmmssff_to_str(const MYSQL_TIME *ltime, char *to, uint fsp) +{ + uint hour= ltime->day * 24 + ltime->hour; + char *pos= to; + DBUG_ASSERT(!ltime->year); + DBUG_ASSERT(!ltime->month); + + if(ltime->neg) + *pos++= '-'; + if (hour >= 24) + { + pos= longlong10_to_str((longlong) hour / 24, pos, 10); + *pos++= ' '; + } + pos= fmt_number2((uint8) (hour % 24), pos); + *pos++= ':'; + pos+= my_mmssff_to_str(ltime, pos, fsp); + *pos= 0; + return (int) (pos-to); +} + + +/* + 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(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_number2((uint8) hour, pos); + + *pos++= ':'; + pos+= my_mmssff_to_str(l_time, 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_number4((uint16) l_time->year, pos); + *pos++='-'; + pos= fmt_number2((uint8) l_time->month, pos); + *pos++='-'; + pos= fmt_number2((uint8) l_time->day, pos); + *pos= 0; + return (int)(pos - to); +} + + +int my_datetime_to_str(const MYSQL_TIME *l_time, char *to, uint digits) +{ + char *pos= to; + pos= fmt_number4((uint16) l_time->year, pos); + *pos++='-'; + pos= fmt_number2((uint8) l_time->month, pos); + *pos++='-'; + pos= fmt_number2((uint8) l_time->day, pos); + *pos++=' '; + pos= fmt_number2((uint8) l_time->hour, pos); + *pos++= ':'; + pos+= my_mmssff_to_str(l_time, 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_usec((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_or_date() + 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_or_date(longlong nr, ulong sec_part, + MYSQL_TIME *time_res, + ulonglong flags, int *was_cut) +{ + long part1,part2; + DBUG_ASSERT(C_FLAGS_OK(flags)); + + *was_cut= 0; + time_res->time_type=MYSQL_TIMESTAMP_DATE; + + if (nr == 0 || nr >= 10000101000000LL) + { + 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)) + { + if (time_res->time_type == MYSQL_TIMESTAMP_DATE && sec_part != 0) + { + /* Date format, but with fractional digits, e.g. 20010203.5 */ + *was_cut= MYSQL_TIME_NOTE_TRUNCATED; + time_res->second_part= 0; + } + return nr; + } + + /* Don't want to have was_cut get set if NO_ZERO_DATE was violated. */ + if (nr || !(flags & C_TIME_NO_ZERO_DATE)) + *was_cut= MYSQL_TIME_WARN_TRUNCATED; + 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= MYSQL_TIME_WARN_TRUNCATED; /* 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_only(my_bool neg, ulonglong nr, ulong sec_part, + ulong max_hour, MYSQL_TIME *ltime, int *was_cut) +{ + static const ulonglong TIME_MAX_mmss= TIME_MAX_MINUTE*100 + TIME_MAX_SECOND; + ulonglong time_max_value= max_hour * 10000ULL + TIME_MAX_mmss; + *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; +} |