1 /* Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
6
7 This program is also distributed with certain software (including
8 but not limited to OpenSSL) that is licensed under separate terms,
9 as designated in a particular file or component or in included license
10 documentation. The authors of MySQL hereby grant you an additional
11 permission to link the program and your derivative works with the
12 separately licensed software that they have included with MySQL.
13
14 Without limiting anything contained in the foregoing, this file,
15 which is part of C Driver for MySQL (Connector/C), is also subject to the
16 Universal FOSS Exception, version 1.0, a copy of which can be found at
17 http://oss.oracle.com/licenses/universal-foss-exception.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License, version 2.0, for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
27
28 /**
29 @file mysys/my_systime.cc Functions for manipulating timespec
30 structs and get_date for converting a time_t to string using various
31 date formats.
32 */
33
34 #include "my_systime.h"
35 #include "my_config.h"
36
37 #include <assert.h>
38 #include <algorithm> // std::min
39 #include <chrono>
40 #include <cstdio> // std::sprintf()
41 #include <limits> // std::numeric_limits
42
43 // Note that timespec is in time.h in C99, but std::timespec will not
44 // be in ctime until C++17
45 #include <time.h> // time_t, timespec
46
47 /**
48 Set the value of a timespec object to the current time plus a
49 number of nanosconds.
50
51 @note the sec value is capped at std::chrono::nanoseconds::max()
52
53 @param[out] abstime time value being modified
54 @param nsec number of nanoseconds to add to current time
55 */
set_timespec_nsec(struct timespec * abstime,Timeout_type nsec)56 void set_timespec_nsec(struct timespec *abstime, Timeout_type nsec) {
57 assert(nsec != std::numeric_limits<Timeout_type>::max());
58 if (nsec == TIMEOUT_INF) {
59 *abstime = TIMESPEC_POSINF;
60 return;
61 }
62 unsigned long long int now = my_getsystime() + (nsec / 100);
63 unsigned long long int tv_sec = now / 10000000ULL;
64 #if SIZEOF_TIME_T < SIZEOF_LONG_LONG
65 /* Ensure that the number of seconds don't overflow. */
66 tv_sec = std::min(tv_sec, static_cast<unsigned long long int>(
67 std::numeric_limits<time_t>::max()));
68 #endif
69 abstime->tv_sec = static_cast<time_t>(tv_sec);
70 abstime->tv_nsec = (now % 10000000ULL) * 100 + (nsec % 100);
71 }
72
73 /**
74 Set the value of a timespec object to the current time plus a
75 number of seconds using seconds.
76
77 @note the sec value is capped at std::chrono::seconds::max()
78
79 @param[out] abstime time value being modified
80 @param sec number of seconds to add to current time
81 */
set_timespec(struct timespec * abstime,Timeout_type sec)82 void set_timespec(struct timespec *abstime, Timeout_type sec) {
83 assert(sec != std::numeric_limits<Timeout_type>::max());
84 if (sec == TIMEOUT_INF) {
85 *abstime = TIMESPEC_POSINF;
86 return;
87 }
88
89 set_timespec_nsec(abstime, sec * 1000000000ULL);
90 }
91
92 /**
93 Store textual representation of date in a character array.
94
95 @param[out] to character array where date will be written
96 @param flag format of date:
97 If flag & GETDATE_TIME Return date and time
98 If flag & GETDATE_SHORT_DATE Return short date format YYMMDD
99 If flag & GETDATE_HHMMSSTIME Return time in HHMMDD format.
100 If flag & GETDATE_GMT Date/time in GMT
101 If flag & GETDATE_FIXEDLENGTH Return fixed length date/time
102 @param date time_t value for conversion.
103
104 @note If flag & GETDATE_T_DELIMITER Append 'T' between date and time.
105 If flag & GETDATE_SHORT_DATE_FULL_YEAR Return compact date format YYYYMMDD
106 */
get_date(char * to,int flag,time_t date)107 void get_date(char *to, int flag, time_t date) {
108 struct tm *start_time;
109 time_t skr;
110 struct tm tm_tmp;
111
112 skr = date ? (time_t)date : my_time(0);
113 if (flag & GETDATE_GMT)
114 gmtime_r(&skr, &tm_tmp);
115 else
116 localtime_r(&skr, &tm_tmp);
117 start_time = &tm_tmp;
118
119 if (flag & GETDATE_SHORT_DATE) {
120 to += std::sprintf(to, "%02d%02d%02d", start_time->tm_year % 100,
121 start_time->tm_mon + 1, start_time->tm_mday);
122 } else if (flag & GETDATE_SHORT_DATE_FULL_YEAR) {
123 to += std::sprintf(to, "%4d%02d%02d", start_time->tm_year + 1900,
124 start_time->tm_mon + 1, start_time->tm_mday);
125 } else {
126 to += std::sprintf(
127 to, ((flag & GETDATE_FIXEDLENGTH) ? "%4d-%02d-%02d" : "%d-%02d-%02d"),
128 start_time->tm_year + 1900, start_time->tm_mon + 1,
129 start_time->tm_mday);
130 }
131 if (flag & GETDATE_DATE_TIME) {
132 if (flag & GETDATE_T_DELIMITER) {
133 *to = 'T';
134 ++to;
135 }
136 to += std::sprintf(
137 to,
138 ((flag & GETDATE_FIXEDLENGTH) ? " %02d:%02d:%02d" : " %2d:%02d:%02d"),
139 start_time->tm_hour, start_time->tm_min, start_time->tm_sec);
140 } else if (flag & GETDATE_HHMMSSTIME) {
141 if (flag & GETDATE_T_DELIMITER) {
142 *to = 'T';
143 ++to;
144 }
145 to += std::sprintf(to, "%02d%02d%02d", start_time->tm_hour,
146 start_time->tm_min, start_time->tm_sec);
147 }
148 }
149