--- /dev/null
+%{
+/* Parse a string into an internal time stamp.
+
+ Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
+ 2010 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Originally written by Steven M. Bellovin <smb@research.att.com> while
+ at the University of North Carolina at Chapel Hill. Later tweaked by
+ a couple of people on Usenet. Completely overhauled by Rich $alz
+ <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.
+
+ Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do
+ the right thing about local DST. Also modified by Paul Eggert
+ <eggert@cs.ucla.edu> in February 2004 to support
+ nanosecond-resolution time stamps, and in October 2004 to support
+ TZ strings in dates. */
+
+/* FIXME: Check for arithmetic overflow in all cases, not just
+ some of them. */
+
+#include <config.h>
+
+#include "parse-datetime.h"
+
+#include "intprops.h"
+#include "timespec.h"
+#include "verify.h"
+
+/* There's no need to extend the stack, so there's no need to involve
+ alloca. */
+#define YYSTACK_USE_ALLOCA 0
+
+/* Tell Bison how much stack space is needed. 20 should be plenty for
+ this grammar, which is not right recursive. Beware setting it too
+ high, since that might cause problems on machines whose
+ implementations have lame stack-overflow checking. */
+#define YYMAXDEPTH 20
+#define YYINITDEPTH YYMAXDEPTH
+
+/* Since the code of parse-datetime.y is not included in the Emacs executable
+ itself, there is no need to #define static in this file. Even if
+ the code were included in the Emacs executable, it probably
+ wouldn't do any harm to #undef it here; this will only cause
+ problems if we try to write to a static variable, which I don't
+ think this code needs to do. */
+#ifdef emacs
+# undef static
+#endif
+
+#include <c-ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "xalloc.h"
+
+/* Bison's skeleton tests _STDLIB_H, while some stdlib.h headers
+ use _STDLIB_H_ as witness. Map the latter to the one bison uses. */
+/* FIXME: this is temporary. Remove when we have a mechanism to ensure
+ that the version we're using is fixed, too. */
+#ifdef _STDLIB_H_
+# undef _STDLIB_H
+# define _STDLIB_H 1
+#endif
+
+/* ISDIGIT differs from isdigit, as follows:
+ - Its arg may be any int or unsigned int; it need not be an unsigned char
+ or EOF.
+ - It's typically faster.
+ POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
+ isdigit unless it's important to use the locale's definition
+ of `digit' even when the host does not conform to POSIX. */
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
+
+/* Shift A right by B bits portably, by dividing A by 2**B and
+ truncating towards minus infinity. A and B should be free of side
+ effects, and B should be in the range 0 <= B <= INT_BITS - 2, where
+ INT_BITS is the number of useful bits in an int. GNU code can
+ assume that INT_BITS is at least 32.
+
+ ISO C99 says that A >> B is implementation-defined if A < 0. Some
+ implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift
+ right in the usual way when A < 0, so SHR falls back on division if
+ ordinary A >> B doesn't seem to be the usual signed shift. */
+#define SHR(a, b) \
+ (-1 >> 1 == -1 \
+ ? (a) >> (b) \
+ : (a) / (1 << (b)) - ((a) % (1 << (b)) < 0))
+
+#define EPOCH_YEAR 1970
+#define TM_YEAR_BASE 1900
+
+#define HOUR(x) ((x) * 60)
+
+/* long_time_t is a signed integer type that contains all time_t values. */
+verify (TYPE_IS_INTEGER (time_t));
+#if TIME_T_FITS_IN_LONG_INT
+typedef long int long_time_t;
+#else
+typedef time_t long_time_t;
+#endif
+
+/* Lots of this code assumes time_t and time_t-like values fit into
+ long_time_t. */
+verify (TYPE_MINIMUM (long_time_t) <= TYPE_MINIMUM (time_t)
+ && TYPE_MAXIMUM (time_t) <= TYPE_MAXIMUM (long_time_t));
+
+/* FIXME: It also assumes that signed integer overflow silently wraps around,
+ but this is not true any more with recent versions of GCC 4. */
+
+/* An integer value, and the number of digits in its textual
+ representation. */
+typedef struct
+{
+ bool negative;
+ long int value;
+ size_t digits;
+} textint;
+
+/* An entry in the lexical lookup table. */
+typedef struct
+{
+ char const *name;
+ int type;
+ int value;
+} table;
+
+/* Meridian: am, pm, or 24-hour style. */
+enum { MERam, MERpm, MER24 };
+
+enum { BILLION = 1000000000, LOG10_BILLION = 9 };
+
+/* Relative times. */
+typedef struct
+{
+ /* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */
+ long int year;
+ long int month;
+ long int day;
+ long int hour;
+ long int minutes;
+ long_time_t seconds;
+ long int ns;
+} relative_time;
+
+#if HAVE_COMPOUND_LITERALS
+# define RELATIVE_TIME_0 ((relative_time) { 0, 0, 0, 0, 0, 0, 0 })
+#else
+static relative_time const RELATIVE_TIME_0;
+#endif
+
+/* Information passed to and from the parser. */
+typedef struct
+{
+ /* The input string remaining to be parsed. */
+ const char *input;
+
+ /* N, if this is the Nth Tuesday. */
+ long int day_ordinal;
+
+ /* Day of week; Sunday is 0. */
+ int day_number;
+
+ /* tm_isdst flag for the local zone. */
+ int local_isdst;
+
+ /* Time zone, in minutes east of UTC. */
+ long int time_zone;
+
+ /* Style used for time. */
+ int meridian;
+
+ /* Gregorian year, month, day, hour, minutes, seconds, and nanoseconds. */
+ textint year;
+ long int month;
+ long int day;
+ long int hour;
+ long int minutes;
+ struct timespec seconds; /* includes nanoseconds */
+
+ /* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */
+ relative_time rel;
+
+ /* Presence or counts of nonterminals of various flavors parsed so far. */
+ bool timespec_seen;
+ bool rels_seen;
+ size_t dates_seen;
+ size_t days_seen;
+ size_t local_zones_seen;
+ size_t dsts_seen;
+ size_t times_seen;
+ size_t zones_seen;
+
+ /* Table of local time zone abbrevations, terminated by a null entry. */
+ table local_time_zone_table[3];
+} parser_control;
+
+union YYSTYPE;
+static int yylex (union YYSTYPE *, parser_control *);
+static int yyerror (parser_control const *, char const *);
+static long int time_zone_hhmm (parser_control *, textint, long int);
+
+/* Extract into *PC any date and time info from a string of digits
+ of the form e.g., YYYYMMDD, YYMMDD, HHMM, HH (and sometimes YYY,
+ YYYY, ...). */
+static void
+digits_to_date_time (parser_control *pc, textint text_int)
+{
+ if (pc->dates_seen && ! pc->year.digits
+ && ! pc->rels_seen && (pc->times_seen || 2 < text_int.digits))
+ pc->year = text_int;
+ else
+ {
+ if (4 < text_int.digits)
+ {
+ pc->dates_seen++;
+ pc->day = text_int.value % 100;
+ pc->month = (text_int.value / 100) % 100;
+ pc->year.value = text_int.value / 10000;
+ pc->year.digits = text_int.digits - 4;
+ }
+ else
+ {
+ pc->times_seen++;
+ if (text_int.digits <= 2)
+ {
+ pc->hour = text_int.value;
+ pc->minutes = 0;
+ }
+ else
+ {
+ pc->hour = text_int.value / 100;
+ pc->minutes = text_int.value % 100;
+ }
+ pc->seconds.tv_sec = 0;
+ pc->seconds.tv_nsec = 0;
+ pc->meridian = MER24;
+ }
+ }
+}
+
+/* Increment PC->rel by FACTOR * REL (FACTOR is 1 or -1). */
+static void
+apply_relative_time (parser_control *pc, relative_time rel, int factor)
+{
+ pc->rel.ns += factor * rel.ns;
+ pc->rel.seconds += factor * rel.seconds;
+ pc->rel.minutes += factor * rel.minutes;
+ pc->rel.hour += factor * rel.hour;
+ pc->rel.day += factor * rel.day;
+ pc->rel.month += factor * rel.month;
+ pc->rel.year += factor * rel.year;
+ pc->rels_seen = true;
+}
+
+/* Set PC-> hour, minutes, seconds and nanoseconds members from arguments. */
+static void
+set_hhmmss (parser_control *pc, long int hour, long int minutes,
+ time_t sec, long int nsec)
+{
+ pc->hour = hour;
+ pc->minutes = minutes;
+ pc->seconds.tv_sec = sec;
+ pc->seconds.tv_nsec = nsec;
+}
+
+%}
+
+/* We want a reentrant parser, even if the TZ manipulation and the calls to
+ localtime and gmtime are not reentrant. */
+%pure-parser
+%parse-param { parser_control *pc }
+%lex-param { parser_control *pc }
+
+/* This grammar has 20 shift/reduce conflicts. */
+%expect 20
+
+%union
+{
+ long int intval;
+ textint textintval;
+ struct timespec timespec;
+ relative_time rel;
+}
+
+%token tAGO tDST
+
+%token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT
+%token <intval> tDAY_UNIT tDAY_SHIFT
+
+%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN
+%token <intval> tMONTH tORDINAL tZONE
+
+%token <textintval> tSNUMBER tUNUMBER
+%token <timespec> tSDECIMAL_NUMBER tUDECIMAL_NUMBER
+
+%type <intval> o_colon_minutes o_merid
+%type <timespec> seconds signed_seconds unsigned_seconds
+
+%type <rel> relunit relunit_snumber dayshift
+
+%%
+
+spec:
+ timespec
+ | items
+ ;
+
+timespec:
+ '@' seconds
+ {
+ pc->seconds = $2;
+ pc->timespec_seen = true;
+ }
+ ;
+
+items:
+ /* empty */
+ | items item
+ ;
+
+item:
+ time
+ { pc->times_seen++; }
+ | local_zone
+ { pc->local_zones_seen++; }
+ | zone
+ { pc->zones_seen++; }
+ | date
+ { pc->dates_seen++; }
+ | day
+ { pc->days_seen++; }
+ | rel
+ | number
+ | hybrid
+ ;
+
+time:
+ tUNUMBER tMERIDIAN
+ {
+ set_hhmmss (pc, $1.value, 0, 0, 0);
+ pc->meridian = $2;
+ }
+ | tUNUMBER ':' tUNUMBER o_merid
+ {
+ set_hhmmss (pc, $1.value, $3.value, 0, 0);
+ pc->meridian = $4;
+ }
+ | tUNUMBER ':' tUNUMBER tSNUMBER o_colon_minutes
+ {
+ set_hhmmss (pc, $1.value, $3.value, 0, 0);
+ pc->meridian = MER24;
+ pc->zones_seen++;
+ pc->time_zone = time_zone_hhmm (pc, $4, $5);
+ }
+ | tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_merid
+ {
+ set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
+ pc->meridian = $6;
+ }
+ | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tSNUMBER o_colon_minutes
+ {
+ set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
+ pc->meridian = MER24;
+ pc->zones_seen++;
+ pc->time_zone = time_zone_hhmm (pc, $6, $7);
+ }
+ ;
+
+local_zone:
+ tLOCAL_ZONE
+ {
+ pc->local_isdst = $1;
+ pc->dsts_seen += (0 < $1);
+ }
+ | tLOCAL_ZONE tDST
+ {
+ pc->local_isdst = 1;
+ pc->dsts_seen += (0 < $1) + 1;
+ }
+ ;
+
+zone:
+ tZONE
+ { pc->time_zone = $1; }
+ | tZONE relunit_snumber
+ { pc->time_zone = $1;
+ apply_relative_time (pc, $2, 1); }
+ | tZONE tSNUMBER o_colon_minutes
+ { pc->time_zone = $1 + time_zone_hhmm (pc, $2, $3); }
+ | tDAYZONE
+ { pc->time_zone = $1 + 60; }
+ | tZONE tDST
+ { pc->time_zone = $1 + 60; }
+ ;
+
+day:
+ tDAY
+ {
+ pc->day_ordinal = 0;
+ pc->day_number = $1;
+ }
+ | tDAY ','
+ {
+ pc->day_ordinal = 0;
+ pc->day_number = $1;
+ }
+ | tORDINAL tDAY
+ {
+ pc->day_ordinal = $1;
+ pc->day_number = $2;
+ }
+ | tUNUMBER tDAY
+ {
+ pc->day_ordinal = $1.value;
+ pc->day_number = $2;
+ }
+ ;
+
+date:
+ tUNUMBER '/' tUNUMBER
+ {
+ pc->month = $1.value;
+ pc->day = $3.value;
+ }
+ | tUNUMBER '/' tUNUMBER '/' tUNUMBER
+ {
+ /* Interpret as YYYY/MM/DD if the first value has 4 or more digits,
+ otherwise as MM/DD/YY.
+ The goal in recognizing YYYY/MM/DD is solely to support legacy
+ machine-generated dates like those in an RCS log listing. If
+ you want portability, use the ISO 8601 format. */
+ if (4 <= $1.digits)
+ {
+ pc->year = $1;
+ pc->month = $3.value;
+ pc->day = $5.value;
+ }
+ else
+ {
+ pc->month = $1.value;
+ pc->day = $3.value;
+ pc->year = $5;
+ }
+ }
+ | tUNUMBER tSNUMBER tSNUMBER
+ {
+ /* ISO 8601 format. YYYY-MM-DD. */
+ pc->year = $1;
+ pc->month = -$2.value;
+ pc->day = -$3.value;
+ }
+ | tUNUMBER tMONTH tSNUMBER
+ {
+ /* e.g. 17-JUN-1992. */
+ pc->day = $1.value;
+ pc->month = $2;
+ pc->year.value = -$3.value;
+ pc->year.digits = $3.digits;
+ }
+ | tMONTH tSNUMBER tSNUMBER
+ {
+ /* e.g. JUN-17-1992. */
+ pc->month = $1;
+ pc->day = -$2.value;
+ pc->year.value = -$3.value;
+ pc->year.digits = $3.digits;
+ }
+ | tMONTH tUNUMBER
+ {
+ pc->month = $1;
+ pc->day = $2.value;
+ }
+ | tMONTH tUNUMBER ',' tUNUMBER
+ {
+ pc->month = $1;
+ pc->day = $2.value;
+ pc->year = $4;
+ }
+ | tUNUMBER tMONTH
+ {
+ pc->day = $1.value;
+ pc->month = $2;
+ }
+ | tUNUMBER tMONTH tUNUMBER
+ {
+ pc->day = $1.value;
+ pc->month = $2;
+ pc->year = $3;
+ }
+ ;
+
+rel:
+ relunit tAGO
+ { apply_relative_time (pc, $1, -1); }
+ | relunit
+ { apply_relative_time (pc, $1, 1); }
+ | dayshift
+ { apply_relative_time (pc, $1, 1); }
+ ;
+
+relunit:
+ tORDINAL tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1; }
+ | tUNUMBER tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1.value; }
+ | tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = 1; }
+ | tORDINAL tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = $1; }
+ | tUNUMBER tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = $1.value; }
+ | tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = 1; }
+ | tORDINAL tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1 * $2; }
+ | tUNUMBER tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; }
+ | tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1; }
+ | tORDINAL tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = $1; }
+ | tUNUMBER tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = $1.value; }
+ | tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = 1; }
+ | tORDINAL tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1; }
+ | tUNUMBER tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; }
+ | tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = 1; }
+ | tORDINAL tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1; }
+ | tUNUMBER tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; }
+ | tSDECIMAL_NUMBER tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; }
+ | tUDECIMAL_NUMBER tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; }
+ | tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = 1; }
+ | relunit_snumber
+ ;
+
+relunit_snumber:
+ tSNUMBER tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1.value; }
+ | tSNUMBER tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = $1.value; }
+ | tSNUMBER tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; }
+ | tSNUMBER tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = $1.value; }
+ | tSNUMBER tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; }
+ | tSNUMBER tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; }
+ ;
+
+dayshift:
+ tDAY_SHIFT
+ { $$ = RELATIVE_TIME_0; $$.day = $1; }
+ ;
+
+seconds: signed_seconds | unsigned_seconds;
+
+signed_seconds:
+ tSDECIMAL_NUMBER
+ | tSNUMBER
+ { $$.tv_sec = $1.value; $$.tv_nsec = 0; }
+ ;
+
+unsigned_seconds:
+ tUDECIMAL_NUMBER
+ | tUNUMBER
+ { $$.tv_sec = $1.value; $$.tv_nsec = 0; }
+ ;
+
+number:
+ tUNUMBER
+ { digits_to_date_time (pc, $1); }
+ ;
+
+hybrid:
+ tUNUMBER relunit_snumber
+ {
+ /* Hybrid all-digit and relative offset, so that we accept e.g.,
+ "YYYYMMDD +N days" as well as "YYYYMMDD N days". */
+ digits_to_date_time (pc, $1);
+ apply_relative_time (pc, $2, 1);
+ }
+ ;
+
+o_colon_minutes:
+ /* empty */
+ { $$ = -1; }
+ | ':' tUNUMBER
+ { $$ = $2.value; }
+ ;
+
+o_merid:
+ /* empty */
+ { $$ = MER24; }
+ | tMERIDIAN
+ { $$ = $1; }
+ ;
+
+%%
+
+static table const meridian_table[] =
+{
+ { "AM", tMERIDIAN, MERam },
+ { "A.M.", tMERIDIAN, MERam },
+ { "PM", tMERIDIAN, MERpm },
+ { "P.M.", tMERIDIAN, MERpm },
+ { NULL, 0, 0 }
+};
+
+static table const dst_table[] =
+{
+ { "DST", tDST, 0 }
+};
+
+static table const month_and_day_table[] =
+{
+ { "JANUARY", tMONTH, 1 },
+ { "FEBRUARY", tMONTH, 2 },
+ { "MARCH", tMONTH, 3 },
+ { "APRIL", tMONTH, 4 },
+ { "MAY", tMONTH, 5 },
+ { "JUNE", tMONTH, 6 },
+ { "JULY", tMONTH, 7 },
+ { "AUGUST", tMONTH, 8 },
+ { "SEPTEMBER",tMONTH, 9 },
+ { "SEPT", tMONTH, 9 },
+ { "OCTOBER", tMONTH, 10 },
+ { "NOVEMBER", tMONTH, 11 },
+ { "DECEMBER", tMONTH, 12 },
+ { "SUNDAY", tDAY, 0 },
+ { "MONDAY", tDAY, 1 },
+ { "TUESDAY", tDAY, 2 },
+ { "TUES", tDAY, 2 },
+ { "WEDNESDAY",tDAY, 3 },
+ { "WEDNES", tDAY, 3 },
+ { "THURSDAY", tDAY, 4 },
+ { "THUR", tDAY, 4 },
+ { "THURS", tDAY, 4 },
+ { "FRIDAY", tDAY, 5 },
+ { "SATURDAY", tDAY, 6 },
+ { NULL, 0, 0 }
+};
+
+static table const time_units_table[] =
+{
+ { "YEAR", tYEAR_UNIT, 1 },
+ { "MONTH", tMONTH_UNIT, 1 },
+ { "FORTNIGHT",tDAY_UNIT, 14 },
+ { "WEEK", tDAY_UNIT, 7 },
+ { "DAY", tDAY_UNIT, 1 },
+ { "HOUR", tHOUR_UNIT, 1 },
+ { "MINUTE", tMINUTE_UNIT, 1 },
+ { "MIN", tMINUTE_UNIT, 1 },
+ { "SECOND", tSEC_UNIT, 1 },
+ { "SEC", tSEC_UNIT, 1 },
+ { NULL, 0, 0 }
+};
+
+/* Assorted relative-time words. */
+static table const relative_time_table[] =
+{
+ { "TOMORROW", tDAY_SHIFT, 1 },
+ { "YESTERDAY",tDAY_SHIFT, -1 },
+ { "TODAY", tDAY_SHIFT, 0 },
+ { "NOW", tDAY_SHIFT, 0 },
+ { "LAST", tORDINAL, -1 },
+ { "THIS", tORDINAL, 0 },
+ { "NEXT", tORDINAL, 1 },
+ { "FIRST", tORDINAL, 1 },
+/*{ "SECOND", tORDINAL, 2 }, */
+ { "THIRD", tORDINAL, 3 },
+ { "FOURTH", tORDINAL, 4 },
+ { "FIFTH", tORDINAL, 5 },
+ { "SIXTH", tORDINAL, 6 },
+ { "SEVENTH", tORDINAL, 7 },
+ { "EIGHTH", tORDINAL, 8 },
+ { "NINTH", tORDINAL, 9 },
+ { "TENTH", tORDINAL, 10 },
+ { "ELEVENTH", tORDINAL, 11 },
+ { "TWELFTH", tORDINAL, 12 },
+ { "AGO", tAGO, 1 },
+ { NULL, 0, 0 }
+};
+
+/* The universal time zone table. These labels can be used even for
+ time stamps that would not otherwise be valid, e.g., GMT time
+ stamps in London during summer. */
+static table const universal_time_zone_table[] =
+{
+ { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */
+ { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
+ { "UTC", tZONE, HOUR ( 0) },
+ { NULL, 0, 0 }
+};
+
+/* The time zone table. This table is necessarily incomplete, as time
+ zone abbreviations are ambiguous; e.g. Australians interpret "EST"
+ as Eastern time in Australia, not as US Eastern Standard Time.
+ You cannot rely on parse_datetime to handle arbitrary time zone
+ abbreviations; use numeric abbreviations like `-0500' instead. */
+static table const time_zone_table[] =
+{
+ { "WET", tZONE, HOUR ( 0) }, /* Western European */
+ { "WEST", tDAYZONE, HOUR ( 0) }, /* Western European Summer */
+ { "BST", tDAYZONE, HOUR ( 0) }, /* British Summer */
+ { "ART", tZONE, -HOUR ( 3) }, /* Argentina */
+ { "BRT", tZONE, -HOUR ( 3) }, /* Brazil */
+ { "BRST", tDAYZONE, -HOUR ( 3) }, /* Brazil Summer */
+ { "NST", tZONE, -(HOUR ( 3) + 30) }, /* Newfoundland Standard */
+ { "NDT", tDAYZONE,-(HOUR ( 3) + 30) }, /* Newfoundland Daylight */
+ { "AST", tZONE, -HOUR ( 4) }, /* Atlantic Standard */
+ { "ADT", tDAYZONE, -HOUR ( 4) }, /* Atlantic Daylight */
+ { "CLT", tZONE, -HOUR ( 4) }, /* Chile */
+ { "CLST", tDAYZONE, -HOUR ( 4) }, /* Chile Summer */
+ { "EST", tZONE, -HOUR ( 5) }, /* Eastern Standard */
+ { "EDT", tDAYZONE, -HOUR ( 5) }, /* Eastern Daylight */
+ { "CST", tZONE, -HOUR ( 6) }, /* Central Standard */
+ { "CDT", tDAYZONE, -HOUR ( 6) }, /* Central Daylight */
+ { "MST", tZONE, -HOUR ( 7) }, /* Mountain Standard */
+ { "MDT", tDAYZONE, -HOUR ( 7) }, /* Mountain Daylight */
+ { "PST", tZONE, -HOUR ( 8) }, /* Pacific Standard */
+ { "PDT", tDAYZONE, -HOUR ( 8) }, /* Pacific Daylight */
+ { "AKST", tZONE, -HOUR ( 9) }, /* Alaska Standard */
+ { "AKDT", tDAYZONE, -HOUR ( 9) }, /* Alaska Daylight */
+ { "HST", tZONE, -HOUR (10) }, /* Hawaii Standard */
+ { "HAST", tZONE, -HOUR (10) }, /* Hawaii-Aleutian Standard */
+ { "HADT", tDAYZONE, -HOUR (10) }, /* Hawaii-Aleutian Daylight */
+ { "SST", tZONE, -HOUR (12) }, /* Samoa Standard */
+ { "WAT", tZONE, HOUR ( 1) }, /* West Africa */
+ { "CET", tZONE, HOUR ( 1) }, /* Central European */
+ { "CEST", tDAYZONE, HOUR ( 1) }, /* Central European Summer */
+ { "MET", tZONE, HOUR ( 1) }, /* Middle European */
+ { "MEZ", tZONE, HOUR ( 1) }, /* Middle European */
+ { "MEST", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */
+ { "MESZ", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */
+ { "EET", tZONE, HOUR ( 2) }, /* Eastern European */
+ { "EEST", tDAYZONE, HOUR ( 2) }, /* Eastern European Summer */
+ { "CAT", tZONE, HOUR ( 2) }, /* Central Africa */
+ { "SAST", tZONE, HOUR ( 2) }, /* South Africa Standard */
+ { "EAT", tZONE, HOUR ( 3) }, /* East Africa */
+ { "MSK", tZONE, HOUR ( 3) }, /* Moscow */
+ { "MSD", tDAYZONE, HOUR ( 3) }, /* Moscow Daylight */
+ { "IST", tZONE, (HOUR ( 5) + 30) }, /* India Standard */
+ { "SGT", tZONE, HOUR ( 8) }, /* Singapore */
+ { "KST", tZONE, HOUR ( 9) }, /* Korea Standard */
+ { "JST", tZONE, HOUR ( 9) }, /* Japan Standard */
+ { "GST", tZONE, HOUR (10) }, /* Guam Standard */
+ { "NZST", tZONE, HOUR (12) }, /* New Zealand Standard */
+ { "NZDT", tDAYZONE, HOUR (12) }, /* New Zealand Daylight */
+ { NULL, 0, 0 }
+};
+
+/* Military time zone table. */
+static table const military_table[] =
+{
+ { "A", tZONE, -HOUR ( 1) },
+ { "B", tZONE, -HOUR ( 2) },
+ { "C", tZONE, -HOUR ( 3) },
+ { "D", tZONE, -HOUR ( 4) },
+ { "E", tZONE, -HOUR ( 5) },
+ { "F", tZONE, -HOUR ( 6) },
+ { "G", tZONE, -HOUR ( 7) },
+ { "H", tZONE, -HOUR ( 8) },
+ { "I", tZONE, -HOUR ( 9) },
+ { "K", tZONE, -HOUR (10) },
+ { "L", tZONE, -HOUR (11) },
+ { "M", tZONE, -HOUR (12) },
+ { "N", tZONE, HOUR ( 1) },
+ { "O", tZONE, HOUR ( 2) },
+ { "P", tZONE, HOUR ( 3) },
+ { "Q", tZONE, HOUR ( 4) },
+ { "R", tZONE, HOUR ( 5) },
+ { "S", tZONE, HOUR ( 6) },
+ { "T", tZONE, HOUR ( 7) },
+ { "U", tZONE, HOUR ( 8) },
+ { "V", tZONE, HOUR ( 9) },
+ { "W", tZONE, HOUR (10) },
+ { "X", tZONE, HOUR (11) },
+ { "Y", tZONE, HOUR (12) },
+ { "Z", tZONE, HOUR ( 0) },
+ { NULL, 0, 0 }
+};
+
+\f
+
+/* Convert a time zone expressed as HH:MM into an integer count of
+ minutes. If MM is negative, then S is of the form HHMM and needs
+ to be picked apart; otherwise, S is of the form HH. As specified in
+ http://www.opengroup.org/susv3xbd/xbd_chap08.html#tag_08_03, allow
+ only valid TZ range, and consider first two digits as hours, if no
+ minutes specified. */
+
+static long int
+time_zone_hhmm (parser_control *pc, textint s, long int mm)
+{
+ long int n_minutes;
+
+ /* If the length of S is 1 or 2 and no minutes are specified,
+ interpret it as a number of hours. */
+ if (s.digits <= 2 && mm < 0)
+ s.value *= 100;
+
+ if (mm < 0)
+ n_minutes = (s.value / 100) * 60 + s.value % 100;
+ else
+ n_minutes = s.value * 60 + (s.negative ? -mm : mm);
+
+ /* If the absolute number of minutes is larger than 24 hours,
+ arrange to reject it by incrementing pc->zones_seen. Thus,
+ we allow only values in the range UTC-24:00 to UTC+24:00. */
+ if (24 * 60 < abs (n_minutes))
+ pc->zones_seen++;
+
+ return n_minutes;
+}
+
+static int
+to_hour (long int hours, int meridian)
+{
+ switch (meridian)
+ {
+ default: /* Pacify GCC. */
+ case MER24:
+ return 0 <= hours && hours < 24 ? hours : -1;
+ case MERam:
+ return 0 < hours && hours < 12 ? hours : hours == 12 ? 0 : -1;
+ case MERpm:
+ return 0 < hours && hours < 12 ? hours + 12 : hours == 12 ? 12 : -1;
+ }
+}
+
+static long int
+to_year (textint textyear)
+{
+ long int year = textyear.value;
+
+ if (year < 0)
+ year = -year;
+
+ /* XPG4 suggests that years 00-68 map to 2000-2068, and
+ years 69-99 map to 1969-1999. */
+ else if (textyear.digits == 2)
+ year += year < 69 ? 2000 : 1900;
+
+ return year;
+}
+
+static table const *
+lookup_zone (parser_control const *pc, char const *name)
+{
+ table const *tp;
+
+ for (tp = universal_time_zone_table; tp->name; tp++)
+ if (strcmp (name, tp->name) == 0)
+ return tp;
+
+ /* Try local zone abbreviations before those in time_zone_table, as
+ the local ones are more likely to be right. */
+ for (tp = pc->local_time_zone_table; tp->name; tp++)
+ if (strcmp (name, tp->name) == 0)
+ return tp;
+
+ for (tp = time_zone_table; tp->name; tp++)
+ if (strcmp (name, tp->name) == 0)
+ return tp;
+
+ return NULL;
+}
+
+#if ! HAVE_TM_GMTOFF
+/* Yield the difference between *A and *B,
+ measured in seconds, ignoring leap seconds.
+ The body of this function is taken directly from the GNU C Library;
+ see src/strftime.c. */
+static long int
+tm_diff (struct tm const *a, struct tm const *b)
+{
+ /* Compute intervening leap days correctly even if year is negative.
+ Take care to avoid int overflow in leap day calculations. */
+ int a4 = SHR (a->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (a->tm_year & 3);
+ int b4 = SHR (b->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (b->tm_year & 3);
+ int a100 = a4 / 25 - (a4 % 25 < 0);
+ int b100 = b4 / 25 - (b4 % 25 < 0);
+ int a400 = SHR (a100, 2);
+ int b400 = SHR (b100, 2);
+ int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+ long int ayear = a->tm_year;
+ long int years = ayear - b->tm_year;
+ long int days = (365 * years + intervening_leap_days
+ + (a->tm_yday - b->tm_yday));
+ return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
+ + (a->tm_min - b->tm_min))
+ + (a->tm_sec - b->tm_sec));
+}
+#endif /* ! HAVE_TM_GMTOFF */
+
+static table const *
+lookup_word (parser_control const *pc, char *word)
+{
+ char *p;
+ char *q;
+ size_t wordlen;
+ table const *tp;
+ bool period_found;
+ bool abbrev;
+
+ /* Make it uppercase. */
+ for (p = word; *p; p++)
+ {
+ unsigned char ch = *p;
+ *p = c_toupper (ch);
+ }
+
+ for (tp = meridian_table; tp->name; tp++)
+ if (strcmp (word, tp->name) == 0)
+ return tp;
+
+ /* See if we have an abbreviation for a month. */
+ wordlen = strlen (word);
+ abbrev = wordlen == 3 || (wordlen == 4 && word[3] == '.');
+
+ for (tp = month_and_day_table; tp->name; tp++)
+ if ((abbrev ? strncmp (word, tp->name, 3) : strcmp (word, tp->name)) == 0)
+ return tp;
+
+ if ((tp = lookup_zone (pc, word)))
+ return tp;
+
+ if (strcmp (word, dst_table[0].name) == 0)
+ return dst_table;
+
+ for (tp = time_units_table; tp->name; tp++)
+ if (strcmp (word, tp->name) == 0)
+ return tp;
+
+ /* Strip off any plural and try the units table again. */
+ if (word[wordlen - 1] == 'S')
+ {
+ word[wordlen - 1] = '\0';
+ for (tp = time_units_table; tp->name; tp++)
+ if (strcmp (word, tp->name) == 0)
+ return tp;
+ word[wordlen - 1] = 'S'; /* For "this" in relative_time_table. */
+ }
+
+ for (tp = relative_time_table; tp->name; tp++)
+ if (strcmp (word, tp->name) == 0)
+ return tp;
+
+ /* Military time zones. */
+ if (wordlen == 1)
+ for (tp = military_table; tp->name; tp++)
+ if (word[0] == tp->name[0])
+ return tp;
+
+ /* Drop out any periods and try the time zone table again. */
+ for (period_found = false, p = q = word; (*p = *q); q++)
+ if (*q == '.')
+ period_found = true;
+ else
+ p++;
+ if (period_found && (tp = lookup_zone (pc, word)))
+ return tp;
+
+ return NULL;
+}
+
+static int
+yylex (YYSTYPE *lvalp, parser_control *pc)
+{
+ unsigned char c;
+ size_t count;
+
+ for (;;)
+ {
+ while (c = *pc->input, c_isspace (c))
+ pc->input++;
+
+ if (ISDIGIT (c) || c == '-' || c == '+')
+ {
+ char const *p;
+ int sign;
+ unsigned long int value;
+ if (c == '-' || c == '+')
+ {
+ sign = c == '-' ? -1 : 1;
+ while (c = *++pc->input, c_isspace (c))
+ continue;
+ if (! ISDIGIT (c))
+ /* skip the '-' sign */
+ continue;
+ }
+ else
+ sign = 0;
+ p = pc->input;
+ for (value = 0; ; value *= 10)
+ {
+ unsigned long int value1 = value + (c - '0');
+ if (value1 < value)
+ return '?';
+ value = value1;
+ c = *++p;
+ if (! ISDIGIT (c))
+ break;
+ if (ULONG_MAX / 10 < value)
+ return '?';
+ }
+ if ((c == '.' || c == ',') && ISDIGIT (p[1]))
+ {
+ time_t s;
+ int ns;
+ int digits;
+ unsigned long int value1;
+
+ /* Check for overflow when converting value to time_t. */
+ if (sign < 0)
+ {
+ s = - value;
+ if (0 < s)
+ return '?';
+ value1 = -s;
+ }
+ else
+ {
+ s = value;
+ if (s < 0)
+ return '?';
+ value1 = s;
+ }
+ if (value != value1)
+ return '?';
+
+ /* Accumulate fraction, to ns precision. */
+ p++;
+ ns = *p++ - '0';
+ for (digits = 2; digits <= LOG10_BILLION; digits++)
+ {
+ ns *= 10;
+ if (ISDIGIT (*p))
+ ns += *p++ - '0';
+ }
+
+ /* Skip excess digits, truncating toward -Infinity. */
+ if (sign < 0)
+ for (; ISDIGIT (*p); p++)
+ if (*p != '0')
+ {
+ ns++;
+ break;
+ }
+ while (ISDIGIT (*p))
+ p++;
+
+ /* Adjust to the timespec convention, which is that
+ tv_nsec is always a positive offset even if tv_sec is
+ negative. */
+ if (sign < 0 && ns)
+ {
+ s--;
+ if (! (s < 0))
+ return '?';
+ ns = BILLION - ns;
+ }
+
+ lvalp->timespec.tv_sec = s;
+ lvalp->timespec.tv_nsec = ns;
+ pc->input = p;
+ return sign ? tSDECIMAL_NUMBER : tUDECIMAL_NUMBER;
+ }
+ else
+ {
+ lvalp->textintval.negative = sign < 0;
+ if (sign < 0)
+ {
+ lvalp->textintval.value = - value;
+ if (0 < lvalp->textintval.value)
+ return '?';
+ }
+ else
+ {
+ lvalp->textintval.value = value;
+ if (lvalp->textintval.value < 0)
+ return '?';
+ }
+ lvalp->textintval.digits = p - pc->input;
+ pc->input = p;
+ return sign ? tSNUMBER : tUNUMBER;
+ }
+ }
+
+ if (c_isalpha (c))
+ {
+ char buff[20];
+ char *p = buff;
+ table const *tp;
+
+ do
+ {
+ if (p < buff + sizeof buff - 1)
+ *p++ = c;
+ c = *++pc->input;
+ }
+ while (c_isalpha (c) || c == '.');
+
+ *p = '\0';
+ tp = lookup_word (pc, buff);
+ if (! tp)
+ return '?';
+ lvalp->intval = tp->value;
+ return tp->type;
+ }
+
+ if (c != '(')
+ return *pc->input++;
+ count = 0;
+ do
+ {
+ c = *pc->input++;
+ if (c == '\0')
+ return c;
+ if (c == '(')
+ count++;
+ else if (c == ')')
+ count--;
+ }
+ while (count != 0);
+ }
+}
+
+/* Do nothing if the parser reports an error. */
+static int
+yyerror (parser_control const *pc _GL_UNUSED,
+ char const *s _GL_UNUSED)
+{
+ return 0;
+}
+
+/* If *TM0 is the old and *TM1 is the new value of a struct tm after
+ passing it to mktime, return true if it's OK that mktime returned T.
+ It's not OK if *TM0 has out-of-range members. */
+
+static bool
+mktime_ok (struct tm const *tm0, struct tm const *tm1, time_t t)
+{
+ if (t == (time_t) -1)
+ {
+ /* Guard against falsely reporting an error when parsing a time
+ stamp that happens to equal (time_t) -1, on a host that
+ supports such a time stamp. */
+ tm1 = localtime (&t);
+ if (!tm1)
+ return false;
+ }
+
+ return ! ((tm0->tm_sec ^ tm1->tm_sec)
+ | (tm0->tm_min ^ tm1->tm_min)
+ | (tm0->tm_hour ^ tm1->tm_hour)
+ | (tm0->tm_mday ^ tm1->tm_mday)
+ | (tm0->tm_mon ^ tm1->tm_mon)
+ | (tm0->tm_year ^ tm1->tm_year));
+}
+
+/* A reasonable upper bound for the size of ordinary TZ strings.
+ Use heap allocation if TZ's length exceeds this. */
+enum { TZBUFSIZE = 100 };
+
+/* Return a copy of TZ, stored in TZBUF if it fits, and heap-allocated
+ otherwise. */
+static char *
+get_tz (char tzbuf[TZBUFSIZE])
+{
+ char *tz = getenv ("TZ");
+ if (tz)
+ {
+ size_t tzsize = strlen (tz) + 1;
+ tz = (tzsize <= TZBUFSIZE
+ ? memcpy (tzbuf, tz, tzsize)
+ : xmemdup (tz, tzsize));
+ }
+ return tz;
+}
+
+/* Parse a date/time string, storing the resulting time value into *RESULT.
+ The string itself is pointed to by P. Return true if successful.
+ P can be an incomplete or relative time specification; if so, use
+ *NOW as the basis for the returned time. */
+bool
+parse_datetime (struct timespec *result, char const *p,
+ struct timespec const *now)
+{
+ time_t Start;
+ long int Start_ns;
+ struct tm const *tmp;
+ struct tm tm;
+ struct tm tm0;
+ parser_control pc;
+ struct timespec gettime_buffer;
+ unsigned char c;
+ bool tz_was_altered = false;
+ char *tz0 = NULL;
+ char tz0buf[TZBUFSIZE];
+ bool ok = true;
+
+ if (! now)
+ {
+ gettime (&gettime_buffer);
+ now = &gettime_buffer;
+ }
+
+ Start = now->tv_sec;
+ Start_ns = now->tv_nsec;
+
+ tmp = localtime (&now->tv_sec);
+ if (! tmp)
+ return false;
+
+ while (c = *p, c_isspace (c))
+ p++;
+
+ if (strncmp (p, "TZ=\"", 4) == 0)
+ {
+ char const *tzbase = p + 4;
+ size_t tzsize = 1;
+ char const *s;
+
+ for (s = tzbase; *s; s++, tzsize++)
+ if (*s == '\\')
+ {
+ s++;
+ if (! (*s == '\\' || *s == '"'))
+ break;
+ }
+ else if (*s == '"')
+ {
+ char *z;
+ char *tz1;
+ char tz1buf[TZBUFSIZE];
+ bool large_tz = TZBUFSIZE < tzsize;
+ bool setenv_ok;
+ /* Free tz0, in case this is the 2nd or subsequent time through. */
+ free (tz0);
+ tz0 = get_tz (tz0buf);
+ z = tz1 = large_tz ? xmalloc (tzsize) : tz1buf;
+ for (s = tzbase; *s != '"'; s++)
+ *z++ = *(s += *s == '\\');
+ *z = '\0';
+ setenv_ok = setenv ("TZ", tz1, 1) == 0;
+ if (large_tz)
+ free (tz1);
+ if (!setenv_ok)
+ goto fail;
+ tz_was_altered = true;
+ p = s + 1;
+ }
+ }
+
+ /* As documented, be careful to treat the empty string just like
+ a date string of "0". Without this, an empty string would be
+ declared invalid when parsed during a DST transition. */
+ if (*p == '\0')
+ p = "0";
+
+ pc.input = p;
+ pc.year.value = tmp->tm_year;
+ pc.year.value += TM_YEAR_BASE;
+ pc.year.digits = 0;
+ pc.month = tmp->tm_mon + 1;
+ pc.day = tmp->tm_mday;
+ pc.hour = tmp->tm_hour;
+ pc.minutes = tmp->tm_min;
+ pc.seconds.tv_sec = tmp->tm_sec;
+ pc.seconds.tv_nsec = Start_ns;
+ tm.tm_isdst = tmp->tm_isdst;
+
+ pc.meridian = MER24;
+ pc.rel = RELATIVE_TIME_0;
+ pc.timespec_seen = false;
+ pc.rels_seen = false;
+ pc.dates_seen = 0;
+ pc.days_seen = 0;
+ pc.times_seen = 0;
+ pc.local_zones_seen = 0;
+ pc.dsts_seen = 0;
+ pc.zones_seen = 0;
+
+#if HAVE_STRUCT_TM_TM_ZONE
+ pc.local_time_zone_table[0].name = tmp->tm_zone;
+ pc.local_time_zone_table[0].type = tLOCAL_ZONE;
+ pc.local_time_zone_table[0].value = tmp->tm_isdst;
+ pc.local_time_zone_table[1].name = NULL;
+
+ /* Probe the names used in the next three calendar quarters, looking
+ for a tm_isdst different from the one we already have. */
+ {
+ int quarter;
+ for (quarter = 1; quarter <= 3; quarter++)
+ {
+ time_t probe = Start + quarter * (90 * 24 * 60 * 60);
+ struct tm const *probe_tm = localtime (&probe);
+ if (probe_tm && probe_tm->tm_zone
+ && probe_tm->tm_isdst != pc.local_time_zone_table[0].value)
+ {
+ {
+ pc.local_time_zone_table[1].name = probe_tm->tm_zone;
+ pc.local_time_zone_table[1].type = tLOCAL_ZONE;
+ pc.local_time_zone_table[1].value = probe_tm->tm_isdst;
+ pc.local_time_zone_table[2].name = NULL;
+ }
+ break;
+ }
+ }
+ }
+#else
+#if HAVE_TZNAME
+ {
+# if !HAVE_DECL_TZNAME
+ extern char *tzname[];
+# endif
+ int i;
+ for (i = 0; i < 2; i++)
+ {
+ pc.local_time_zone_table[i].name = tzname[i];
+ pc.local_time_zone_table[i].type = tLOCAL_ZONE;
+ pc.local_time_zone_table[i].value = i;
+ }
+ pc.local_time_zone_table[i].name = NULL;
+ }
+#else
+ pc.local_time_zone_table[0].name = NULL;
+#endif
+#endif
+
+ if (pc.local_time_zone_table[0].name && pc.local_time_zone_table[1].name
+ && ! strcmp (pc.local_time_zone_table[0].name,
+ pc.local_time_zone_table[1].name))
+ {
+ /* This locale uses the same abbrevation for standard and
+ daylight times. So if we see that abbreviation, we don't
+ know whether it's daylight time. */
+ pc.local_time_zone_table[0].value = -1;
+ pc.local_time_zone_table[1].name = NULL;
+ }
+
+ if (yyparse (&pc) != 0)
+ goto fail;
+
+ if (pc.timespec_seen)
+ *result = pc.seconds;
+ else
+ {
+ if (1 < (pc.times_seen | pc.dates_seen | pc.days_seen | pc.dsts_seen
+ | (pc.local_zones_seen + pc.zones_seen)))
+ goto fail;
+
+ tm.tm_year = to_year (pc.year) - TM_YEAR_BASE;
+ tm.tm_mon = pc.month - 1;
+ tm.tm_mday = pc.day;
+ if (pc.times_seen || (pc.rels_seen && ! pc.dates_seen && ! pc.days_seen))
+ {
+ tm.tm_hour = to_hour (pc.hour, pc.meridian);
+ if (tm.tm_hour < 0)
+ goto fail;
+ tm.tm_min = pc.minutes;
+ tm.tm_sec = pc.seconds.tv_sec;
+ }
+ else
+ {
+ tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+ pc.seconds.tv_nsec = 0;
+ }
+
+ /* Let mktime deduce tm_isdst if we have an absolute time stamp. */
+ if (pc.dates_seen | pc.days_seen | pc.times_seen)
+ tm.tm_isdst = -1;
+
+ /* But if the input explicitly specifies local time with or without
+ DST, give mktime that information. */
+ if (pc.local_zones_seen)
+ tm.tm_isdst = pc.local_isdst;
+
+ tm0 = tm;
+
+ Start = mktime (&tm);
+
+ if (! mktime_ok (&tm0, &tm, Start))
+ {
+ if (! pc.zones_seen)
+ goto fail;
+ else
+ {
+ /* Guard against falsely reporting errors near the time_t
+ boundaries when parsing times in other time zones. For
+ example, suppose the input string "1969-12-31 23:00:00 -0100",
+ the current time zone is 8 hours ahead of UTC, and the min
+ time_t value is 1970-01-01 00:00:00 UTC. Then the min
+ localtime value is 1970-01-01 08:00:00, and mktime will
+ therefore fail on 1969-12-31 23:00:00. To work around the
+ problem, set the time zone to 1 hour behind UTC temporarily
+ by setting TZ="XXX1:00" and try mktime again. */
+
+ long int time_zone = pc.time_zone;
+ long int abs_time_zone = time_zone < 0 ? - time_zone : time_zone;
+ long int abs_time_zone_hour = abs_time_zone / 60;
+ int abs_time_zone_min = abs_time_zone % 60;
+ char tz1buf[sizeof "XXX+0:00"
+ + sizeof pc.time_zone * CHAR_BIT / 3];
+ if (!tz_was_altered)
+ tz0 = get_tz (tz0buf);
+ sprintf (tz1buf, "XXX%s%ld:%02d", "-" + (time_zone < 0),
+ abs_time_zone_hour, abs_time_zone_min);
+ if (setenv ("TZ", tz1buf, 1) != 0)
+ goto fail;
+ tz_was_altered = true;
+ tm = tm0;
+ Start = mktime (&tm);
+ if (! mktime_ok (&tm0, &tm, Start))
+ goto fail;
+ }
+ }
+
+ if (pc.days_seen && ! pc.dates_seen)
+ {
+ tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7
+ + 7 * (pc.day_ordinal
+ - (0 < pc.day_ordinal
+ && tm.tm_wday != pc.day_number)));
+ tm.tm_isdst = -1;
+ Start = mktime (&tm);
+ if (Start == (time_t) -1)
+ goto fail;
+ }
+
+ /* Add relative date. */
+ if (pc.rel.year | pc.rel.month | pc.rel.day)
+ {
+ int year = tm.tm_year + pc.rel.year;
+ int month = tm.tm_mon + pc.rel.month;
+ int day = tm.tm_mday + pc.rel.day;
+ if (((year < tm.tm_year) ^ (pc.rel.year < 0))
+ | ((month < tm.tm_mon) ^ (pc.rel.month < 0))
+ | ((day < tm.tm_mday) ^ (pc.rel.day < 0)))
+ goto fail;
+ tm.tm_year = year;
+ tm.tm_mon = month;
+ tm.tm_mday = day;
+ tm.tm_hour = tm0.tm_hour;
+ tm.tm_min = tm0.tm_min;
+ tm.tm_sec = tm0.tm_sec;
+ tm.tm_isdst = tm0.tm_isdst;
+ Start = mktime (&tm);
+ if (Start == (time_t) -1)
+ goto fail;
+ }
+
+ /* The only "output" of this if-block is an updated Start value,
+ so this block must follow others that clobber Start. */
+ if (pc.zones_seen)
+ {
+ long int delta = pc.time_zone * 60;
+ time_t t1;
+#ifdef HAVE_TM_GMTOFF
+ delta -= tm.tm_gmtoff;
+#else
+ time_t t = Start;
+ struct tm const *gmt = gmtime (&t);
+ if (! gmt)
+ goto fail;
+ delta -= tm_diff (&tm, gmt);
+#endif
+ t1 = Start - delta;
+ if ((Start < t1) != (delta < 0))
+ goto fail; /* time_t overflow */
+ Start = t1;
+ }
+
+ /* Add relative hours, minutes, and seconds. On hosts that support
+ leap seconds, ignore the possibility of leap seconds; e.g.,
+ "+ 10 minutes" adds 600 seconds, even if one of them is a
+ leap second. Typically this is not what the user wants, but it's
+ too hard to do it the other way, because the time zone indicator
+ must be applied before relative times, and if mktime is applied
+ again the time zone will be lost. */
+ {
+ long int sum_ns = pc.seconds.tv_nsec + pc.rel.ns;
+ long int normalized_ns = (sum_ns % BILLION + BILLION) % BILLION;
+ time_t t0 = Start;
+ long int d1 = 60 * 60 * pc.rel.hour;
+ time_t t1 = t0 + d1;
+ long int d2 = 60 * pc.rel.minutes;
+ time_t t2 = t1 + d2;
+ long_time_t d3 = pc.rel.seconds;
+ long_time_t t3 = t2 + d3;
+ long int d4 = (sum_ns - normalized_ns) / BILLION;
+ long_time_t t4 = t3 + d4;
+ time_t t5 = t4;
+
+ if ((d1 / (60 * 60) ^ pc.rel.hour)
+ | (d2 / 60 ^ pc.rel.minutes)
+ | ((t1 < t0) ^ (d1 < 0))
+ | ((t2 < t1) ^ (d2 < 0))
+ | ((t3 < t2) ^ (d3 < 0))
+ | ((t4 < t3) ^ (d4 < 0))
+ | (t5 != t4))
+ goto fail;
+
+ result->tv_sec = t5;
+ result->tv_nsec = normalized_ns;
+ }
+ }
+
+ goto done;
+
+ fail:
+ ok = false;
+ done:
+ if (tz_was_altered)
+ ok &= (tz0 ? setenv ("TZ", tz0, 1) : unsetenv ("TZ")) == 0;
+ if (tz0 != tz0buf)
+ free (tz0);
+ return ok;
+}
+
+#if TEST
+
+int
+main (int ac, char **av)
+{
+ char buff[BUFSIZ];
+
+ printf ("Enter date, or blank line to exit.\n\t> ");
+ fflush (stdout);
+
+ buff[BUFSIZ - 1] = '\0';
+ while (fgets (buff, BUFSIZ - 1, stdin) && buff[0])
+ {
+ struct timespec d;
+ struct tm const *tm;
+ if (! parse_datetime (&d, buff, NULL))
+ printf ("Bad format - couldn't convert.\n");
+ else if (! (tm = localtime (&d.tv_sec)))
+ {
+ long int sec = d.tv_sec;
+ printf ("localtime (%ld) failed\n", sec);
+ }
+ else
+ {
+ int ns = d.tv_nsec;
+ printf ("%04ld-%02d-%02d %02d:%02d:%02d.%09d\n",
+ tm->tm_year + 1900L, tm->tm_mon + 1, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec, ns);
+ }
+ printf ("\t> ");
+ fflush (stdout);
+ }
+ return 0;
+}
+#endif /* TEST */
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