date.c
上传用户:blenddy
上传日期:2007-01-07
资源大小:6495k
文件大小:28k
- /*-------------------------------------------------------------------------
- *
- * date.c
- * Utilities for the built-in type "AbsoluteTime" (defined in nabstime).
- * Functions for the built-in type "RelativeTime".
- * Functions for the built-in type "TimeInterval".
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /usr/local/cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.32.2.1 1999/08/02 05:24:51 scrappy Exp $
- *
- * NOTES
- * This code is actually (almost) unused.
- * It needs to be integrated with Time and struct trange.
- *
- * XXX This code needs to be rewritten to work with the "new" definitions
- * XXX in h/tim.h. Look for int32's, int, long, etc. in the code. The
- * XXX definitions in h/tim.h may need to be rethought also.
- *
- * XXX This code has been cleaned up some - avi 07/07/93
- *
- *-------------------------------------------------------------------------
- */
- #include <ctype.h>
- #include <time.h>
- #include <sys/time.h>
- #include <sys/types.h>
- #include "postgres.h"
- #ifdef HAVE_FLOAT_H
- #include <float.h>
- #endif
- #ifdef HAVE_LIMITS_H
- #include <limits.h>
- #endif
- #include "access/xact.h"
- #include "miscadmin.h"
- #include "utils/builtins.h"
- #include "utils/dt.h"
- #define INVALID_RELTIME_STR "Undefined RelTime"
- #define INVALID_RELTIME_STR_LEN (sizeof(INVALID_RELTIME_STR)-1)
- #define RELTIME_LABEL '@'
- #define RELTIME_PAST "ago"
- #define DIRMAXLEN (sizeof(RELTIME_PAST)-1)
- /*
- * Unix epoch is Jan 1 00:00:00 1970. Postgres knows about times
- * sixty-eight years on either side of that.
- */
- #define IsSpace(C) ((C) == ' ')
- #define T_INTERVAL_INVAL 0 /* data represents no valid interval */
- #define T_INTERVAL_VALID 1 /* data represents a valid interval */
- /*
- * ['Mon May 10 23:59:12 1943 PST' 'Sun Jan 14 03:14:21 1973 PST']
- * 0 1 2 3 4 5 6
- * 1234567890123456789012345678901234567890123456789012345678901234
- *
- * we allocate some extra -- timezones are usually 3 characters but
- * this is not in the POSIX standard...
- */
- #define T_INTERVAL_LEN 80
- #define INVALID_INTERVAL_STR "Undefined Range"
- #define INVALID_INTERVAL_STR_LEN (sizeof(INVALID_INTERVAL_STR)-1)
- #define ABSTIMEMIN(t1, t2) abstimele((t1),(t2)) ? (t1) : (t2)
- #define ABSTIMEMAX(t1, t2) abstimelt((t1),(t2)) ? (t2) : (t1)
- #ifdef NOT_USED
- static char *unit_tab[] = {
- "second", "seconds", "minute", "minutes",
- "hour", "hours", "day", "days", "week", "weeks",
- "month", "months", "year", "years"};
- #define UNITMAXLEN 7 /* max length of a unit name */
- #define NUNITS 14 /* number of different units */
- /* table of seconds per unit (month = 30 days, year = 365 days) */
- static int sec_tab[] = {
- 1, 1, 60, 60,
- 3600, 3600, 86400, 86400, 604800, 604800,
- 2592000, 2592000, 31536000, 31536000};
- #endif
- /*
- * Function prototypes -- internal to this file only
- */
- static void reltime2tm(RelativeTime time, struct tm * tm);
- #ifdef NOT_USED
- static int correct_unit(char *unit, int *unptr);
- static int correct_dir(char *direction, int *signptr);
- #endif
- static int istinterval(char *i_string,
- AbsoluteTime *i_start,
- AbsoluteTime *i_end);
- /*****************************************************************************
- * USER I/O ROUTINES *
- *****************************************************************************/
- /*
- * reltimein - converts a reltime string in an internal format
- */
- RelativeTime
- reltimein(char *str)
- {
- RelativeTime result;
- struct tm tt,
- *tm = &tt;
- double fsec;
- int dtype;
- char *field[MAXDATEFIELDS];
- int nf,
- ftype[MAXDATEFIELDS];
- char lowstr[MAXDATELEN + 1];
- if (!PointerIsValid(str))
- elog(ERROR, "Bad (null) date external representation", NULL);
- if (strlen(str) > MAXDATELEN)
- elog(ERROR, "Bad (length) reltime external representation '%s'", str);
- if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
- || (DecodeDateDelta(field, ftype, nf, &dtype, tm, &fsec) != 0))
- elog(ERROR, "Bad reltime external representation '%s'", str);
- #ifdef DATEDEBUG
- printf("reltimein- %d fields are type %d (DTK_DATE=%d)n", nf, dtype, DTK_DATE);
- #endif
- switch (dtype)
- {
- case DTK_DELTA:
- result = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec);
- result += (((tm->tm_year * 365) + (tm->tm_mon * 30) + tm->tm_mday) * (24 * 60 * 60));
- return result;
- default:
- return INVALID_RELTIME;
- }
- elog(ERROR, "Bad reltime (internal coding error) '%s'", str);
- return INVALID_RELTIME;
- } /* reltimein() */
- /*
- * reltimeout - converts the internal format to a reltime string
- */
- char *
- reltimeout(RelativeTime time)
- {
- char *result;
- struct tm tt,
- *tm = &tt;
- char buf[MAXDATELEN + 1];
- if (time == INVALID_RELTIME)
- {
- strcpy(buf, INVALID_RELTIME_STR);
- }
- else
- {
- reltime2tm(time, tm);
- EncodeTimeSpan(tm, 0, DateStyle, buf);
- }
- result = palloc(strlen(buf) + 1);
- strcpy(result, buf);
- return result;
- } /* reltimeout() */
- #define TMODULO(t,q,u)
- do {
- q = (t / u);
- if (q != 0) t -= (q * u);
- } while(0)
- static void
- reltime2tm(RelativeTime time, struct tm * tm)
- {
- TMODULO(time, tm->tm_year, 31536000);
- TMODULO(time, tm->tm_mon, 2592000);
- TMODULO(time, tm->tm_mday, 86400);
- TMODULO(time, tm->tm_hour, 3600);
- TMODULO(time, tm->tm_min, 60);
- TMODULO(time, tm->tm_sec, 1);
- return;
- } /* reltime2tm() */
- #ifdef NOT_USED
- int
- dummyfunc()
- {
- char *timestring;
- long quantity;
- int i;
- int unitnr;
- timestring = (char *) palloc(Max(strlen(INVALID_RELTIME_STR),
- UNITMAXLEN) + 1);
- if (timevalue == INVALID_RELTIME)
- {
- strcpy(timestring, INVALID_RELTIME_STR);
- return timestring;
- }
- if (timevalue == 0)
- i = 1; /* unit = 'seconds' */
- else
- for (i = 12; i >= 0; i = i - 2)
- if ((timevalue % sec_tab[i]) == 0)
- break; /* appropriate unit found */
- unitnr = i;
- quantity = (timevalue / sec_tab[unitnr]);
- if (quantity > 1 || quantity < -1)
- unitnr++; /* adjust index for PLURAL of unit */
- if (quantity >= 0)
- sprintf(timestring, "%c %lu %s", RELTIME_LABEL,
- quantity, unit_tab[unitnr]);
- else
- sprintf(timestring, "%c %lu %s %s", RELTIME_LABEL,
- (quantity * -1), unit_tab[unitnr], RELTIME_PAST);
- return timestring;
- }
- #endif
- /*
- * tintervalin - converts an interval string to an internal format
- */
- TimeInterval
- tintervalin(char *intervalstr)
- {
- int error;
- AbsoluteTime i_start,
- i_end,
- t1,
- t2;
- TimeInterval interval;
- interval = (TimeInterval) palloc(sizeof(TimeIntervalData));
- error = istinterval(intervalstr, &t1, &t2);
- if (error == 0)
- interval->status = T_INTERVAL_INVAL;
- if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
- interval->status = T_INTERVAL_INVAL; /* undefined */
- else
- {
- i_start = ABSTIMEMIN(t1, t2);
- i_end = ABSTIMEMAX(t1, t2);
- interval->data[0] = i_start;
- interval->data[1] = i_end;
- interval->status = T_INTERVAL_VALID;
- }
- return interval;
- }
- /*
- * tintervalout - converts an internal interval format to a string
- *
- */
- char *
- tintervalout(TimeInterval interval)
- {
- char *i_str,
- *p;
- i_str = (char *) palloc(T_INTERVAL_LEN); /* ['...' '...'] */
- strcpy(i_str, "["");
- if (interval->status == T_INTERVAL_INVAL)
- strcat(i_str, INVALID_INTERVAL_STR);
- else
- {
- p = nabstimeout(interval->data[0]);
- strcat(i_str, p);
- pfree(p);
- strcat(i_str, "" "");
- p = nabstimeout(interval->data[1]);
- strcat(i_str, p);
- pfree(p);
- }
- strcat(i_str, ""] ");
- return i_str;
- }
- /*****************************************************************************
- * PUBLIC ROUTINES *
- *****************************************************************************/
- RelativeTime
- timespan_reltime(TimeSpan *timespan)
- {
- RelativeTime time;
- int year,
- month;
- double span;
- if (!PointerIsValid(timespan))
- time = INVALID_RELTIME;
- if (TIMESPAN_IS_INVALID(*timespan))
- {
- time = INVALID_RELTIME;
- }
- else
- {
- if (timespan->month == 0)
- {
- year = 0;
- month = 0;
- }
- else if (abs(timespan->month) >= 12)
- {
- year = (timespan->month / 12);
- month = (timespan->month % 12);
- }
- else
- {
- year = 0;
- month = timespan->month;
- }
- span = (((((double) 365 * year) + ((double) 30 * month)) * 86400) + timespan->time);
- #ifdef DATEDEBUG
- printf("timespan_reltime- convert m%d s%f to %f [%d %d]n",
- timespan->month, timespan->time, span, INT_MIN, INT_MAX);
- #endif
- time = (((span > INT_MIN) && (span < INT_MAX)) ? span : INVALID_RELTIME);
- }
- return time;
- } /* timespan_reltime() */
- TimeSpan *
- reltime_timespan(RelativeTime reltime)
- {
- TimeSpan *result;
- int year,
- month;
- if (!PointerIsValid(result = palloc(sizeof(TimeSpan))))
- elog(ERROR, "Memory allocation failed, can't convert reltime to timespan", NULL);
- switch (reltime)
- {
- case INVALID_RELTIME:
- TIMESPAN_INVALID(*result);
- break;
- default:
- TMODULO(reltime, year, 31536000);
- TMODULO(reltime, month, 2592000);
- result->time = reltime;
- result->month = ((12 * year) + month);
- }
- return result;
- } /* reltime_timespan() */
- /*
- * mktinterval - creates a time interval with endpoints t1 and t2
- */
- TimeInterval
- mktinterval(AbsoluteTime t1, AbsoluteTime t2)
- {
- AbsoluteTime tstart = ABSTIMEMIN(t1, t2),
- tend = ABSTIMEMAX(t1, t2);
- TimeInterval interval;
- interval = (TimeInterval) palloc(sizeof(TimeIntervalData));
- if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
- interval->status = T_INTERVAL_INVAL;
- else
- {
- interval->status = T_INTERVAL_VALID;
- interval->data[0] = tstart;
- interval->data[1] = tend;
- }
- return interval;
- }
- /*
- * timepl, timemi and abstimemi use the formula
- * abstime + reltime = abstime
- * so abstime - reltime = abstime
- * and abstime - abstime = reltime
- */
- /*
- * timepl - returns the value of (abstime t1 + relime t2)
- */
- AbsoluteTime
- timepl(AbsoluteTime t1, RelativeTime t2)
- {
- if (t1 == CURRENT_ABSTIME)
- t1 = GetCurrentTransactionStartTime();
- if (AbsoluteTimeIsReal(t1) &&
- RelativeTimeIsValid(t2) &&
- ((t2 > 0) ? (t1 < NOEND_ABSTIME - t2)
- : (t1 > NOSTART_ABSTIME - t2))) /* prevent overflow */
- return t1 + t2;
- return INVALID_ABSTIME;
- }
- /*
- * timemi - returns the value of (abstime t1 - reltime t2)
- */
- AbsoluteTime
- timemi(AbsoluteTime t1, RelativeTime t2)
- {
- if (t1 == CURRENT_ABSTIME)
- t1 = GetCurrentTransactionStartTime();
- if (AbsoluteTimeIsReal(t1) &&
- RelativeTimeIsValid(t2) &&
- ((t2 > 0) ? (t1 > NOSTART_ABSTIME + t2)
- : (t1 < NOEND_ABSTIME + t2))) /* prevent overflow */
- return t1 - t2;
- return INVALID_ABSTIME;
- }
- /*
- * abstimemi - returns the value of (abstime t1 - abstime t2)
- */
- static RelativeTime
- abstimemi(AbsoluteTime t1, AbsoluteTime t2)
- {
- if (t1 == CURRENT_ABSTIME)
- t1 = GetCurrentTransactionStartTime();
- if (t2 == CURRENT_ABSTIME)
- t2 = GetCurrentTransactionStartTime();
- if (AbsoluteTimeIsReal(t1) &&
- AbsoluteTimeIsReal(t2))
- return t1 - t2;
- return INVALID_RELTIME;
- }
- /*
- * ininterval - returns 1, iff absolute date is in the interval
- */
- int
- ininterval(AbsoluteTime t, TimeInterval interval)
- {
- if (interval->status == T_INTERVAL_VALID && t != INVALID_ABSTIME)
- return (abstimege(t, interval->data[0]) &&
- abstimele(t, interval->data[1]));
- return 0;
- }
- /*
- * intervalrel - returns relative time corresponding to interval
- */
- RelativeTime
- intervalrel(TimeInterval interval)
- {
- if (interval->status == T_INTERVAL_VALID)
- return abstimemi(interval->data[1], interval->data[0]);
- else
- return INVALID_RELTIME;
- }
- /*
- * timenow - returns time "now", internal format
- *
- * Now AbsoluteTime is time since Jan 1 1970 -mer 7 Feb 1992
- */
- AbsoluteTime
- timenow()
- {
- time_t sec;
- if (time(&sec) < 0)
- return INVALID_ABSTIME;
- return (AbsoluteTime) sec;
- }
- /*
- * reltimeeq - returns 1, iff arguments are equal
- * reltimene - returns 1, iff arguments are not equal
- * reltimelt - returns 1, iff t1 less than t2
- * reltimegt - returns 1, iff t1 greater than t2
- * reltimele - returns 1, iff t1 less than or equal to t2
- * reltimege - returns 1, iff t1 greater than or equal to t2
- */
- bool
- reltimeeq(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 == t2;
- }
- bool
- reltimene(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 != t2;
- }
- bool
- reltimelt(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 < t2;
- }
- bool
- reltimegt(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 > t2;
- }
- bool
- reltimele(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 <= t2;
- }
- bool
- reltimege(RelativeTime t1, RelativeTime t2)
- {
- if (t1 == INVALID_RELTIME || t2 == INVALID_RELTIME)
- return 0;
- return t1 >= t2;
- }
- /*
- * intervalsame - returns 1, iff interval i1 is same as interval i2
- * Check begin and end time.
- */
- bool
- intervalsame(TimeInterval i1, TimeInterval i2)
- {
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- return (abstimeeq(i1->data[0], i2->data[0]) &&
- abstimeeq(i1->data[1], i2->data[1]));
- } /* intervalsame() */
- /*
- * intervaleq - returns 1, iff interval i1 is equal to interval i2
- * Check length of intervals.
- */
- bool
- intervaleq(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) == (t21 - t20);
- } /* intervaleq() */
- /*
- * intervalne - returns 1, iff interval i1 is not equal to interval i2
- * Check length of intervals.
- */
- bool
- intervalne(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) != (t21 - t20);
- } /* intervalne() */
- /*
- * intervallt - returns TRUE, iff interval i1 is less than interval i2
- * Check length of intervals.
- */
- bool
- intervallt(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) < (t21 - t20);
- } /* intervallt() */
- /*
- * intervalle - returns TRUE, iff interval i1 is less than or equal to interval i2
- * Check length of intervals.
- */
- bool
- intervalle(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) <= (t21 - t20);
- } /* intervalle() */
- /*
- * intervalgt - returns TRUE, iff interval i1 is less than interval i2
- * Check length of intervals.
- */
- bool
- intervalgt(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) > (t21 - t20);
- } /* intervalgt() */
- /*
- * intervalge - returns TRUE, iff interval i1 is less than or equal to interval i2
- * Check length of intervals.
- */
- bool
- intervalge(TimeInterval i1, TimeInterval i2)
- {
- AbsoluteTime t10,
- t11,
- t20,
- t21;
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return FALSE; /* invalid interval */
- t10 = i1->data[0];
- t11 = i1->data[1];
- t20 = i2->data[0];
- t21 = i2->data[1];
- if ((t10 == INVALID_ABSTIME) || (t20 == INVALID_ABSTIME)
- || (t20 == INVALID_ABSTIME) || (t21 == INVALID_ABSTIME))
- return FALSE;
- if (t10 == CURRENT_ABSTIME)
- t10 = GetCurrentTransactionStartTime();
- if (t11 == CURRENT_ABSTIME)
- t11 = GetCurrentTransactionStartTime();
- if (t20 == CURRENT_ABSTIME)
- t20 = GetCurrentTransactionStartTime();
- if (t21 == CURRENT_ABSTIME)
- t21 = GetCurrentTransactionStartTime();
- return (t11 - t10) >= (t21 - t20);
- } /* intervalge() */
- /*
- * intervalleneq - returns 1, iff length of interval i is equal to
- * reltime t
- */
- bool
- intervalleneq(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt == t;
- }
- /*
- * intervallenne - returns 1, iff length of interval i is not equal
- * to reltime t
- */
- bool
- intervallenne(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt != t;
- }
- /*
- * intervallenlt - returns 1, iff length of interval i is less than
- * reltime t
- */
- bool
- intervallenlt(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt < t;
- }
- /*
- * intervallengt - returns 1, iff length of interval i is greater than
- * reltime t
- */
- bool
- intervallengt(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt > t;
- }
- /*
- * intervallenle - returns 1, iff length of interval i is less or equal
- * than reltime t
- */
- bool
- intervallenle(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt <= t;
- }
- /*
- * intervallenge - returns 1, iff length of interval i is greater or
- * equal than reltime t
- */
- bool
- intervallenge(TimeInterval i, RelativeTime t)
- {
- RelativeTime rt;
- if ((i->status == T_INTERVAL_INVAL) || (t == INVALID_RELTIME))
- return 0;
- rt = intervalrel(i);
- return rt != INVALID_RELTIME && rt >= t;
- }
- /*
- * intervalct - returns 1, iff interval i1 contains interval i2
- */
- bool
- intervalct(TimeInterval i1, TimeInterval i2)
- {
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return 0;
- return (abstimele(i1->data[0], i2->data[0]) &&
- abstimege(i1->data[1], i2->data[1]));
- }
- /*
- * intervalov - returns 1, iff interval i1 (partially) overlaps i2
- */
- bool
- intervalov(TimeInterval i1, TimeInterval i2)
- {
- if (i1->status == T_INTERVAL_INVAL || i2->status == T_INTERVAL_INVAL)
- return 0;
- return (!(abstimelt(i1->data[1], i2->data[0]) ||
- abstimegt(i1->data[0], i2->data[1])));
- }
- /*
- * intervalstart - returns the start of interval i
- */
- AbsoluteTime
- intervalstart(TimeInterval i)
- {
- if (i->status == T_INTERVAL_INVAL)
- return INVALID_ABSTIME;
- return i->data[0];
- }
- /*
- * intervalend - returns the end of interval i
- */
- AbsoluteTime
- intervalend(TimeInterval i)
- {
- if (i->status == T_INTERVAL_INVAL)
- return INVALID_ABSTIME;
- return i->data[1];
- }
- /*****************************************************************************
- * PRIVATE ROUTINES *
- *****************************************************************************/
- #ifdef NOT_USED
- /*
- * isreltime - returns 1, iff datestring is of type reltime
- * 2, iff datestring is 'invalid time' identifier
- * 0, iff datestring contains a syntax error
- * VALID time less or equal +/- `@ 68 years'
- *
- */
- int
- isreltime(char *str)
- {
- struct tm tt,
- *tm = &tt;
- double fsec;
- int dtype;
- char *field[MAXDATEFIELDS];
- int nf,
- ftype[MAXDATEFIELDS];
- char lowstr[MAXDATELEN + 1];
- if (!PointerIsValid(str))
- return 0;
- if (strlen(str) > MAXDATELEN)
- return 0;
- if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
- || (DecodeDateDelta(field, ftype, nf, &dtype, tm, &fsec) != 0))
- return 0;
- switch (dtype)
- {
- case (DTK_DELTA):
- return (abs(tm->tm_year) <= 68) ? 1 : 0;
- break;
- case (DTK_INVALID):
- return 2;
- break;
- default:
- return 0;
- break;
- }
- return 0;
- } /* isreltime() */
- #endif
- #ifdef NOT_USED
- int
- dummyfunc()
- {
- char *p;
- char c;
- int i;
- char unit[UNITMAXLEN];
- char direction[DIRMAXLEN];
- int localSign;
- int localUnitNumber;
- long localQuantity;
- if (!PointerIsValid(sign))
- sign = &localSign;
- if (!PointerIsValid(unitnr))
- unitnr = &localUnitNumber;
- if (!PointerIsValid(quantity))
- quantity = &localQuantity;
- unit[0] = ' ';
- direction[0] = ' ';
- p = timestring;
- /* skip leading blanks */
- while ((c = *p) != ' ')
- {
- if (c != ' ')
- break;
- p++;
- }
- /* Test whether 'invalid time' identifier or not */
- if (!strncmp(INVALID_RELTIME_STR, p, strlen(INVALID_RELTIME_STR) + 1))
- return 2; /* correct 'invalid time' identifier found */
- /* handle label of relative time */
- if (c != RELTIME_LABEL)
- return 0; /* syntax error */
- c = *++p;
- if (c != ' ')
- return 0; /* syntax error */
- p++;
- /* handle the quantity */
- *quantity = 0;
- for (;;)
- {
- c = *p;
- if (isdigit(c))
- {
- *quantity = *quantity * 10 + (c - '0');
- p++;
- }
- else
- {
- if (c == ' ')
- break; /* correct quantity found */
- else
- return 0; /* syntax error */
- }
- }
- /* handle unit */
- p++;
- i = 0;
- for (;;)
- {
- c = *p;
- if (c >= 'a' && c <= 'z' && i <= (UNITMAXLEN - 1))
- {
- unit[i] = c;
- p++;
- i++;
- }
- else
- {
- if ((c == ' ' || c == ' ')
- && correct_unit(unit, unitnr))
- break; /* correct unit found */
- else
- return 0; /* syntax error */
- }
- }
- /* handle optional direction */
- if (c == ' ')
- p++;
- i = 0;
- *sign = 1;
- for (;;)
- {
- c = *p;
- if (c >= 'a' && c <= 'z' && i <= (DIRMAXLEN - 1))
- {
- direction[i] = c;
- p++;
- i++;
- }
- else
- {
- if ((c == ' ' || c == ' ') && i == 0)
- {
- *sign = 1;
- break; /* no direction specified */
- }
- if ((c == ' ' || c == ' ') && i != 0)
- {
- direction[i] = ' ';
- correct_dir(direction, sign);
- break; /* correct direction found */
- }
- else
- return 0; /* syntax error */
- }
- }
- return 1;
- }
- /*
- * correct_unit - returns 1, iff unit is a correct unit description
- *
- * output parameter:
- * unptr: points to an integer which is the appropriate unit number
- * (see function isreltime())
- */
- static int
- correct_unit(char *unit, int *unptr)
- {
- int j = 0;
- while (j < NUNITS)
- {
- if (strncmp(unit, unit_tab[j], strlen(unit_tab[j])) == 0)
- {
- *unptr = j;
- return 1;
- }
- j++;
- }
- return 0; /* invalid unit descriptor */
- }
- /*
- * correct_dir - returns 1, iff direction is a correct identifier
- *
- * output parameter:
- * signptr: points to -1 if dir corresponds to past tense
- * else to 1
- */
- static int
- correct_dir(char *direction, int *signptr)
- {
- *signptr = 1;
- if (strncmp(RELTIME_PAST, direction, strlen(RELTIME_PAST) + 1) == 0)
- {
- *signptr = -1;
- return 1;
- }
- else
- return 0; /* invalid direction descriptor */
- }
- #endif
- /*
- * istinterval - returns 1, iff i_string is a valid interval descr.
- * 0, iff i_string is NOT a valid interval desc.
- * 2, iff any time is INVALID_ABSTIME
- *
- * output parameter:
- * i_start, i_end: interval margins
- *
- * Time interval:
- * `[' {` '} `'' <AbsTime> `'' {` '} `'' <AbsTime> `'' {` '} `]'
- *
- * OR `Undefined Range' (see also INVALID_INTERVAL_STR)
- *
- * where <AbsTime> satisfies the syntax of absolute time.
- *
- * e.g. [ ' Jan 18 1902' 'Jan 1 00:00:00 1970']
- */
- static int
- istinterval(char *i_string,
- AbsoluteTime *i_start,
- AbsoluteTime *i_end)
- {
- char *p,
- *p1;
- char c;
- p = i_string;
- /* skip leading blanks up to '[' */
- while ((c = *p) != ' ')
- {
- if (IsSpace(c))
- p++;
- else if (c != '[')
- return 0; /* syntax error */
- else
- break;
- }
- p++;
- /* skip leading blanks up to "'" */
- while ((c = *p) != ' ')
- {
- if (IsSpace(c))
- p++;
- else if (c != '"')
- return 0; /* syntax error */
- else
- break;
- }
- p++;
- if (strncmp(INVALID_INTERVAL_STR, p, strlen(INVALID_INTERVAL_STR)) == 0)
- return 0; /* undefined range, handled like a syntax
- * err. */
- /* search for the end of the first date and change it to a NULL */
- p1 = p;
- while ((c = *p1) != ' ')
- {
- if (c == '"')
- {
- *p1 = ' ';
- break;
- }
- p1++;
- }
- /* get the first date */
- *i_start = nabstimein(p); /* first absolute date */
- /* rechange NULL at the end of the first date to a "'" */
- *p1 = '"';
- p = ++p1;
- /* skip blanks up to "'", beginning of second date */
- while ((c = *p) != ' ')
- {
- if (IsSpace(c))
- p++;
- else if (c != '"')
- return 0; /* syntax error */
- else
- break;
- }
- p++;
- /* search for the end of the second date and change it to a NULL */
- p1 = p;
- while ((c = *p1) != ' ')
- {
- if (c == '"')
- {
- *p1 = ' ';
- break;
- }
- p1++;
- }
- /* get the second date */
- *i_end = nabstimein(p); /* second absolute date */
- /* rechange NULL at the end of the first date to a ''' */
- *p1 = '"';
- p = ++p1;
- /* skip blanks up to ']' */
- while ((c = *p) != ' ')
- {
- if (IsSpace(c))
- p++;
- else if (c != ']')
- return 0; /* syntax error */
- else
- break;
- }
- p++;
- c = *p;
- if (c != ' ')
- return 0; /* syntax error */
- /* it seems to be a valid interval */
- return 1;
- }
- /*****************************************************************************
- *
- *****************************************************************************/
- /*
- * timeofday -
- * returns the current time as a text. similar to timenow() but returns
- * seconds with more precision (up to microsecs). (I need this to compare
- * the Wisconsin benchmark with Illustra whose TimeNow() shows current
- * time with precision up to microsecs.) - ay 3/95
- */
- text *
- timeofday(void)
- {
- struct timeval tp;
- struct timezone tpz;
- char templ[500];
- char buf[500];
- text *tm;
- int len = 0;
- gettimeofday(&tp, &tpz);
- strftime(templ, sizeof(templ), "%a %b %d %H:%M:%S.%%d %Y %Z",
- localtime((time_t *) &tp.tv_sec));
- sprintf(buf, templ, tp.tv_usec);
- len = VARHDRSZ + strlen(buf);
- tm = (text *) palloc(len);
- VARSIZE(tm) = len;
- strncpy(VARDATA(tm), buf, strlen(buf));
- return tm;
- }