call; this is an improvement on a bug fix suggested by
martin@dresden.nacamar.de. Do not assume that localtime and
gmtime return non-null.
From Paul Eggert.
(__attribute__): Define.
(ATTRIBUTE_UNUSED): Define.
(yyerror): Mark parameter as unused with ATTRIBUTE_UNUSED.
(MonthDayTable): Add initializers for last entry.
(UnitsTable): Likewise.
(OtherTable): Likewise.
(MilitaryTable): Likewise.
Move inclusion of getdate.h and dependent extern declarations down
so getdate.h's prototype follows the sometimes-enabled definition
of `const' to nothing. Otherwise, the prototype wouldn't match
the definition because of the defined-away `const'.
(get_date): ANSI-fy definition.
From Kaveh Ghazi.
(tDAY_UNIT): Likewise for yyRelDay.
(tHOUR_UNIT): Likewise for yyRelHour.
(tMINUTE_UNIT): Likewise for yyRelMinutes.
(tSEC_UNIT): Likewise for yyRelSeconds.
* getdate.y: Rewrite to use mktime.
<sys/timeb.h>: Don't include.
(mktime): Declare.
(struct timeb, timezone, DOOMSDAY, SECSPERDAY, DSTMODE, yyDSTmode,
ToSeconds, Convert, DSTcorrect, RelativeDate, RelativeMonth): Remove.
(ToHour): New function (part of the old ToSeconds fn).
(ToYear): New function (part of the old Convert fn).
(TABLE.value, yyDayOrdinal, yyDayNumber, yyTimezone, yyDay, yyHour,
yyMinutes, yyMonth, yySeconds, yyYear, yyRelMonth, yyRelSeconds,
Number): Now int instead of time_t.
(HOUR): Don't cast to time_t.
(tDAY_UNIT, tHOUR_UNIT, tYEAR_UNIT): New %tokens.
(UnitsTable): Use new units that are closer to the keywords.
(yyRelDay, yyRelHour, yyRelMinutes, yyRelYear): New variables.
(rel, relunit, get_date): Add support for them.
(time): Fix timezone calculations for negative half-hour offsets
when integer division truncates towards minus infinity.
(zone): Incorporiate DST calculation directly.
(get_date): 2nd arg is now time_t *, not struct timeb *.
Use mktime to do most of the work, instead of computing it ourselves.
Guard against falsely reporting errors near the time_t boundaries
when parsing times in other time zones.
(ISDIGIT): New definition from Paul Eggert.
This one evaluates its argument exactly once.
(yylex): Move increment out of ISALPHA argument. Use a
comma-expression instead.
that push the year through the end of the century work. For example,
`date -d "01/01/1998 3 years" +%Y' now prints 2001.
From Peter Dalgaard (pd@kubism.ku.dk).
