lib/util/time.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    time utility functions
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef _SAMBA_TIME_H_
  20 #define _SAMBA_TIME_H_
  21
  22 #ifndef _PUBLIC_
  23 #define _PUBLIC_
  24 #endif
  25
  26 #ifndef TIME_T_MIN
  27 /* we use 0 here, because (time_t)-1 means error */
  28 #define TIME_T_MIN 0
  29 #endif
  30
  31 /*
  32  * we use the INT32_MAX here as on 64 bit systems,
  33  * gmtime() fails with INT64_MAX
  34  */
  35 #ifndef TIME_T_MAX
  36 #define TIME_T_MAX MIN(INT32_MAX,_TYPE_MAXIMUM(time_t))
  37 #endif
  38
  39
  40 /* 64 bit time (100 nanosec) 1601 - cifs6.txt, section 3.5, page 30, 4 byte aligned */
  41 typedef uint64_t NTTIME;
  42
  43 /**
  44  External access to time_t_min and time_t_max.
  45 **/
  46 _PUBLIC_ time_t get_time_t_max(void);
  47
  48 /**
  49 a gettimeofday wrapper
  50 **/
  51 _PUBLIC_ void GetTimeOfDay(struct timeval *tval);
  52
  53 /**
  54 interpret an 8 byte "filetime" structure to a time_t
  55 It's originally in "100ns units since jan 1st 1601"
  56 **/
  57 _PUBLIC_ time_t nt_time_to_unix(NTTIME nt);
  58
  59 /**
  60 put a 8 byte filetime from a time_t
  61 This takes GMT as input
  62 **/
  63 _PUBLIC_ void unix_to_nt_time(NTTIME *nt, time_t t);
  64
  65 /**
  66 check if it's a null unix time
  67 **/
  68 _PUBLIC_ bool null_time(time_t t);
  69
  70 /**
  71 check if it's a null NTTIME
  72 **/
  73 _PUBLIC_ bool null_nttime(NTTIME t);
  74
  75 /**
  76 put a dos date into a buffer (time/date format)
  77 This takes GMT time and puts local time in the buffer
  78 **/
  79 _PUBLIC_ void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset);
  80
  81 /**
  82 put a dos date into a buffer (date/time format)
  83 This takes GMT time and puts local time in the buffer
  84 **/
  85 _PUBLIC_ void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset);
  86
  87 /**
  88 put a dos 32 bit "unix like" date into a buffer. This routine takes
  89 GMT and converts it to LOCAL time before putting it (most SMBs assume
  90 localtime for this sort of date)
  91 **/
  92 _PUBLIC_ void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset);
  93
  94 /**
  95   create a unix date (int GMT) from a dos date (which is actually in
  96   localtime)
  97 **/
  98 _PUBLIC_ time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset);
  99
 100 /**
 101 like make_unix_date() but the words are reversed
 102 **/
 103 _PUBLIC_ time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset);
 104
 105 /**
 106   create a unix GMT date from a dos date in 32 bit "unix like" format
 107   these generally arrive as localtimes, with corresponding DST
 108 **/
 109 _PUBLIC_ time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset);
 110
 111 /**
 112 return a HTTP/1.0 time string
 113 **/
 114 _PUBLIC_ char *http_timestring(TALLOC_CTX *mem_ctx, time_t t);
 115
 116 /**
 117  Return the date and time as a string
 118 **/
 119 _PUBLIC_ char *timestring(TALLOC_CTX *mem_ctx, time_t t);
 120
 121 /**
 122   return a talloced string representing a NTTIME for human consumption
 123 */
 124 _PUBLIC_ const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt);
 125
 126 /**
 127   put a NTTIME into a packet
 128 */
 129 _PUBLIC_ void push_nttime(uint8_t *base, uint16_t offset, NTTIME t);
 130
 131 /**
 132   pull a NTTIME from a packet
 133 */
 134 _PUBLIC_ NTTIME pull_nttime(uint8_t *base, uint16_t offset);
 135
 136 /**
 137   parse a nttime as a large integer in a string and return a NTTIME
 138 */
 139 _PUBLIC_ NTTIME nttime_from_string(const char *s);
 140
 141 /**
 142   return (tv1 - tv2) in microseconds
 143 */
 144 _PUBLIC_ int64_t usec_time_diff(const struct timeval *tv1, const struct timeval *tv2);
 145
 146 /**
 147   return a zero timeval
 148 */
 149 _PUBLIC_ struct timeval timeval_zero(void);
 150
 151 /**
 152   return true if a timeval is zero
 153 */
 154 _PUBLIC_ bool timeval_is_zero(const struct timeval *tv);
 155
 156 /**
 157   return a timeval for the current time
 158 */
 159 _PUBLIC_ struct timeval timeval_current(void);
 160
 161 /**
 162   return a timeval struct with the given elements
 163 */
 164 _PUBLIC_ struct timeval timeval_set(uint32_t secs, uint32_t usecs);
 165
 166 /**
 167   return a timeval ofs microseconds after tv
 168 */
 169 _PUBLIC_ struct timeval timeval_add(const struct timeval *tv,
 170                            uint32_t secs, uint32_t usecs);
 171
 172 /**
 173   return the sum of two timeval structures
 174 */
 175 struct timeval timeval_sum(const struct timeval *tv1,
 176                            const struct timeval *tv2);
 177
 178 /**
 179   return a timeval secs/usecs into the future
 180 */
 181 _PUBLIC_ struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs);
 182
 183 /**
 184   compare two timeval structures.
 185   Return -1 if tv1 < tv2
 186   Return 0 if tv1 == tv2
 187   Return 1 if tv1 > tv2
 188 */
 189 _PUBLIC_ int timeval_compare(const struct timeval *tv1, const struct timeval *tv2);
 190
 191 /**
 192   return true if a timer is in the past
 193 */
 194 _PUBLIC_ bool timeval_expired(const struct timeval *tv);
 195
 196 /**
 197   return the number of seconds elapsed between two times
 198 */
 199 _PUBLIC_ double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2);
 200
 201 /**
 202   return the number of seconds elapsed since a given time
 203 */
 204 _PUBLIC_ double timeval_elapsed(const struct timeval *tv);
 205
 206 /**
 207   return the lesser of two timevals
 208 */
 209 _PUBLIC_ struct timeval timeval_min(const struct timeval *tv1,
 210                            const struct timeval *tv2);
 211
 212 /**
 213   return the greater of two timevals
 214 */
 215 _PUBLIC_ struct timeval timeval_max(const struct timeval *tv1,
 216                            const struct timeval *tv2);
 217
 218 /**
 219   return the difference between two timevals as a timeval
 220   if tv1 comes after tv2, then return a zero timeval
 221   (this is *tv2 - *tv1)
 222 */
 223 _PUBLIC_ struct timeval timeval_until(const struct timeval *tv1,
 224                              const struct timeval *tv2);
 225
 226 /**
 227   convert a timeval to a NTTIME
 228 */
 229 _PUBLIC_ NTTIME timeval_to_nttime(const struct timeval *tv);
 230
 231 /**
 232   convert a NTTIME to a timeval
 233 */
 234 _PUBLIC_ void nttime_to_timeval(struct timeval *tv, NTTIME t);
 235
 236 /**
 237   return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
 238  */
 239 _PUBLIC_ int get_time_zone(time_t t);
 240
 241 /**
 242   check if 2 NTTIMEs are equal.
 243 */
 244 bool nt_time_equal(NTTIME *t1, NTTIME *t2);
 245
 246 void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second);
 247
 248 struct timespec nt_time_to_unix_timespec(NTTIME *nt);
 249
 250 time_t convert_timespec_to_time_t(struct timespec ts);
 251
 252 struct timespec convert_time_t_to_timespec(time_t t);
 253
 254 bool null_timespec(struct timespec ts);
 255
 256 /** Extra minutes to add to the normal GMT to local time conversion. */
 257 extern int extra_time_offset;
 258
 259 #endif /* _SAMBA_TIME_H_ */