2 PostgreSQL Data Base Management System (formerly known as Postgres, then
5 Copyright (c) 1994-7 Regents of the University of California
7 Permission to use, copy, modify, and distribute this software and its
8 documentation for any purpose, without fee, and without a written agreement
9 is hereby granted, provided that the above copyright notice and this
10 paragraph and the following two paragraphs appear in all copies.
12 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
13 DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
14 LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
15 DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
16 POSSIBILITY OF SUCH DAMAGE.
18 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
22 PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 /*-------------------------------------------------------------------------
27 * Definitions for the date/time and other date/time support code.
28 * The support code is shared with other date data types,
29 * including abstime, reltime, date, and time.
32 * Copyright (c) 1994, Regents of the University of California
34 *-------------------------------------------------------------------------
42 /* We have to include stdlib.h here because it defines many of these macros
43 on some platforms, and we only want our definitions used if stdlib.h doesn't
49 /* ----------------------------------------------------------------
50 * Section 1: bool, true, false, TRUE, FALSE
51 * ----------------------------------------------------------------
55 * Boolean value, either true or false.
58 #define false ((char) 0)
59 #define true ((char) 1)
63 #endif /* ndef bool */
65 typedef bool *BoolPtr;
77 /* ----------------------------------------------------------------
78 * Section 3: standard system types
79 * ----------------------------------------------------------------
84 * Signed integer, EXACTLY N BITS IN SIZE,
85 * used for numerical computations and the
86 * frontend/backend protocol.
88 typedef signed char int8; /* == 8 bits */
89 typedef signed short int16; /* == 16 bits */
90 typedef signed int int32; /* == 32 bits */
94 * Unsigned integer, EXACTLY N BITS IN SIZE,
95 * used for numerical computations and the
96 * frontend/backend protocol.
98 typedef unsigned char uint8; /* == 8 bits */
99 typedef unsigned short uint16; /* == 16 bits */
100 typedef unsigned int uint32; /* == 32 bits */
104 * Floating point number, AT LEAST N BITS IN SIZE,
105 * used for numerical computations.
107 * Since sizeof(floatN) may be > sizeof(char *), always pass
108 * floatN by reference.
110 typedef float float32data;
111 typedef double float64data;
112 typedef float *float32;
113 typedef double *float64;
117 * Boolean value, AT LEAST N BITS IN SIZE.
119 typedef uint8 bool8; /* >= 8 bits */
120 typedef uint16 bool16; /* >= 16 bits */
121 typedef uint32 bool32; /* >= 32 bits */
124 /* Date/Time Configuration
126 * Constants to pass info from runtime environment:
127 * USE_POSTGRES_DATES specifies traditional postgres format for output.
128 * USE_ISO_DATES specifies ISO-compliant format for output.
129 * USE_SQL_DATES specified Oracle/Ingres-compliant format for output.
130 * USE_GERMAN_DATES specifies German-style dd.mm/yyyy date format.
132 * DateStyle specifies preference for date formatting for output.
133 * EuroDates if client prefers dates interpreted and written w/European conventions.
135 * HasCTZSet if client timezone is specified by client.
136 * CDayLight is the apparent daylight savings time status.
137 * CTimeZone is the timezone offset in seconds.
138 * CTZName is the timezone label.
141 #define USE_POSTGRES_DATES 0
142 #define USE_ISO_DATES 1
143 #define USE_SQL_DATES 2
144 #define USE_GERMAN_DATES 3
146 extern int DateStyle;
147 extern bool EuroDates;
148 extern int CTimeZone;
150 typedef double float8;
158 typedef struct varlena text;
162 typedef int AbsoluteTime;
163 typedef int RelativeTime;
166 * Note a leap year is one that is a multiple of 4
167 * but not of a 100. Except if it is a multiple of
168 * 400 then it is a leap year.
170 #define isleap(y) (((y % 4) == 0) && (((y % 100) != 0) || ((y % 400) == 0)))
173 * DateTime represents absolute time.
174 * TimeSpan represents delta time. Keep track of months (and years)
175 * separately since the elapsed time spanned is unknown until instantiated
176 * relative to an absolute time.
178 * Note that Postgres uses "time interval" to mean a bounded interval,
179 * consisting of a beginning and ending time, not a time span - thomas 97/03/20
182 typedef double DateTime;
186 double time; /* all time units other than months and
188 int month; /* months and years, after time for
193 /* ----------------------------------------------------------------
194 * time types + support macros
196 * String definitions for standard time quantities.
198 * These strings are the defaults used to form output time strings.
199 * Other alternate forms are hardcoded into token tables in dt.c.
200 * ----------------------------------------------------------------
204 #define DCURRENT "current"
205 #define EPOCH "epoch"
206 #define INVALID "invalid"
207 #define EARLY "-infinity"
208 #define LATE "infinity"
210 #define TODAY "today"
211 #define TOMORROW "tomorrow"
212 #define YESTERDAY "yesterday"
215 #define DMICROSEC "usecond"
216 #define DMILLISEC "msecond"
217 #define DSECOND "second"
218 #define DMINUTE "minute"
222 #define DMONTH "month"
223 #define DQUARTER "quarter"
225 #define DDECADE "decade"
226 #define DCENTURY "century"
227 #define DMILLENIUM "millenium"
230 #define DTIMEZONE "timezone"
233 * Fundamental time field definitions for parsing.
235 * Meridian: am, pm, or 24-hour style.
247 * Fields for time decoding.
248 * Can't have more of these than there are bits in an unsigned int
249 * since these are turned into bit masks during parsing and decoding.
256 #define TIMES 4 /* not used - thomas 1997-07-14 */
260 #define IGNOREFIELD 8
269 /* these are only for relative dates */
271 #define ABS_BEFORE 18
275 * Token field definitions for time parsing and decoding.
276 * These need to fit into the datetkn table type.
277 * At the moment, that means keep them within [-127,127].
278 * These are also used for bit masks in DecodeDateDelta()
279 * so actually restrict them to within [0,31] for now.
281 * Not all of these fields are used for masks in DecodeDateDelta
282 * so allow some larger than 31. - thomas 1997-11-17
293 #define DTK_SPECIAL 6
294 #define DTK_INVALID 7
295 #define DTK_CURRENT 8
300 #define DTK_YESTERDAY 13
302 #define DTK_TOMORROW 15
306 #define DTK_SECOND 18
307 #define DTK_MINUTE 19
312 #define DTK_QUARTER 24
314 #define DTK_DECADE 26
315 #define DTK_CENTURY 27
316 #define DTK_MILLENIUM 28
317 #define DTK_MILLISEC 29
318 #define DTK_MICROSEC 30
322 #define DTK_TZ_HOUR 34
323 #define DTK_TZ_MINUTE 35
326 * Bit mask definitions for time parsing.
329 #define DTK_M(t) (0x01 << (t))
331 #define DTK_DATE_M (DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY))
332 #define DTK_TIME_M (DTK_M(HOUR) | DTK_M(MINUTE) | DTK_M(SECOND))
334 #define MAXDATELEN 47 /* maximum possible length of an input
336 #define MAXDATEFIELDS 25 /* maximum possible number of fields in a
338 #define TOKMAXLEN 10 /* only this many chars are stored in
341 /* keep this struct small; it gets used a lot */
347 char token[TOKMAXLEN];
350 char value; /* this may be unsigned, alas */
360 void j2date(int jd, int *year, int *month, int *day);
361 int date2j(int year, int month, int day);
363 int ParseDateTime(char *timestr, char *lowstr,
364 char **field, int *ftype, int maxfields, int *numfields);
365 int DecodeDateTime(char **field, int *ftype,
366 int nf, int *dtype, struct tm * tm, double *fsec, int *tzp);
368 int DecodeTimeOnly(char **field, int *ftype, int nf,
369 int *dtype, struct tm * tm, double *fsec);