--- /dev/null
+%{
+/* Parse a string into an internal time stamp.
+ Copyright (C) 1999, 2000, 2002 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 2, 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, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* 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. Unlike previous versions, this
+ version is reentrant. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+# ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+# endif
+#endif
+
+/* Since the code of getdate.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 <ctype.h>
+#include <string.h>
+
+#if HAVE_STDLIB_H
+# include <stdlib.h> /* for `free'; used by Bison 1.27 */
+#endif
+
+#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
+# define IN_CTYPE_DOMAIN(c) 1
+#else
+# define IN_CTYPE_DOMAIN(c) isascii (c)
+#endif
+
+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
+#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
+#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
+#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
+
+/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
+ - Its arg may be any int or unsigned int; it need not be an unsigned char.
+ - It's guaranteed to evaluate its argument exactly once.
+ - It's typically faster.
+ POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
+ ISDIGIT_LOCALE 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) (c) - '0' <= 9)
+
+#if STDC_HEADERS || HAVE_STRING_H
+# include <string.h>
+#endif
+
+#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
+# define __attribute__(x)
+#endif
+
+#ifndef ATTRIBUTE_UNUSED
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#endif
+
+#define EPOCH_YEAR 1970
+#define TM_YEAR_BASE 1900
+
+#define HOUR(x) ((x) * 60)
+
+/* An integer value, and the number of digits in its textual
+ representation. */
+typedef struct
+{
+ int value;
+ int 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 };
+
+/* 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. */
+ 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. */
+ int time_zone;
+
+ /* Style used for time. */
+ int meridian;
+
+ /* Gregorian year, month, day, hour, minutes, and seconds. */
+ textint year;
+ int month;
+ int day;
+ int hour;
+ int minutes;
+ int seconds;
+
+ /* Relative year, month, day, hour, minutes, and seconds. */
+ int rel_year;
+ int rel_month;
+ int rel_day;
+ int rel_hour;
+ int rel_minutes;
+ int rel_seconds;
+
+ /* Counts of nonterminals of various flavors parsed so far. */
+ int dates_seen;
+ int days_seen;
+ int local_zones_seen;
+ int rels_seen;
+ int times_seen;
+ int zones_seen;
+
+ /* Table of local time zone abbrevations, terminated by a null entry. */
+ table local_time_zone_table[3];
+} parser_control;
+
+#define PC (* (parser_control *) parm)
+#define YYLEX_PARAM parm
+#define YYPARSE_PARAM parm
+
+static int yyerror ();
+static int yylex ();
+
+%}
+
+/* We want a reentrant parser. */
+%pure_parser
+
+/* This grammar has 13 shift/reduce conflicts. */
+%expect 13
+
+%union
+{
+ int intval;
+ textint textintval;
+}
+
+%token tAGO tDST
+
+%token <intval> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tLOCAL_ZONE tMERIDIAN
+%token <intval> tMINUTE_UNIT tMONTH tMONTH_UNIT tSEC_UNIT tYEAR_UNIT tZONE
+
+%token <textintval> tSNUMBER tUNUMBER
+
+%type <intval> o_merid
+
+%%
+
+spec:
+ /* empty */
+ | spec 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
+ { PC.rels_seen++; }
+ | number
+ ;
+
+time:
+ tUNUMBER tMERIDIAN
+ {
+ PC.hour = $1.value;
+ PC.minutes = 0;
+ PC.seconds = 0;
+ PC.meridian = $2;
+ }
+ | tUNUMBER ':' tUNUMBER o_merid
+ {
+ PC.hour = $1.value;
+ PC.minutes = $3.value;
+ PC.seconds = 0;
+ PC.meridian = $4;
+ }
+ | tUNUMBER ':' tUNUMBER tSNUMBER
+ {
+ PC.hour = $1.value;
+ PC.minutes = $3.value;
+ PC.meridian = MER24;
+ PC.zones_seen++;
+ PC.time_zone = $4.value % 100 + ($4.value / 100) * 60;
+ }
+ | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid
+ {
+ PC.hour = $1.value;
+ PC.minutes = $3.value;
+ PC.seconds = $5.value;
+ PC.meridian = $6;
+ }
+ | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER
+ {
+ PC.hour = $1.value;
+ PC.minutes = $3.value;
+ PC.seconds = $5.value;
+ PC.meridian = MER24;
+ PC.zones_seen++;
+ PC.time_zone = $6.value % 100 + ($6.value / 100) * 60;
+ }
+ ;
+
+local_zone:
+ tLOCAL_ZONE
+ { PC.local_isdst = $1; }
+ | tLOCAL_ZONE tDST
+ { PC.local_isdst = $1 < 0 ? 1 : $1 + 1; }
+ ;
+
+zone:
+ tZONE
+ { PC.time_zone = $1; }
+ | tDAYZONE
+ { PC.time_zone = $1 + 60; }
+ | tZONE tDST
+ { PC.time_zone = $1 + 60; }
+ ;
+
+day:
+ tDAY
+ {
+ PC.day_ordinal = 1;
+ PC.day_number = $1;
+ }
+ | tDAY ','
+ {
+ PC.day_ordinal = 1;
+ PC.day_number = $1;
+ }
+ | 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 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
+ {
+ PC.rel_seconds = -PC.rel_seconds;
+ PC.rel_minutes = -PC.rel_minutes;
+ PC.rel_hour = -PC.rel_hour;
+ PC.rel_day = -PC.rel_day;
+ PC.rel_month = -PC.rel_month;
+ PC.rel_year = -PC.rel_year;
+ }
+ | relunit
+ ;
+
+relunit:
+ tUNUMBER tYEAR_UNIT
+ { PC.rel_year += $1.value * $2; }
+ | tSNUMBER tYEAR_UNIT
+ { PC.rel_year += $1.value * $2; }
+ | tYEAR_UNIT
+ { PC.rel_year += $1; }
+ | tUNUMBER tMONTH_UNIT
+ { PC.rel_month += $1.value * $2; }
+ | tSNUMBER tMONTH_UNIT
+ { PC.rel_month += $1.value * $2; }
+ | tMONTH_UNIT
+ { PC.rel_month += $1; }
+ | tUNUMBER tDAY_UNIT
+ { PC.rel_day += $1.value * $2; }
+ | tSNUMBER tDAY_UNIT
+ { PC.rel_day += $1.value * $2; }
+ | tDAY_UNIT
+ { PC.rel_day += $1; }
+ | tUNUMBER tHOUR_UNIT
+ { PC.rel_hour += $1.value * $2; }
+ | tSNUMBER tHOUR_UNIT
+ { PC.rel_hour += $1.value * $2; }
+ | tHOUR_UNIT
+ { PC.rel_hour += $1; }
+ | tUNUMBER tMINUTE_UNIT
+ { PC.rel_minutes += $1.value * $2; }
+ | tSNUMBER tMINUTE_UNIT
+ { PC.rel_minutes += $1.value * $2; }
+ | tMINUTE_UNIT
+ { PC.rel_minutes += $1; }
+ | tUNUMBER tSEC_UNIT
+ { PC.rel_seconds += $1.value * $2; }
+ | tSNUMBER tSEC_UNIT
+ { PC.rel_seconds += $1.value * $2; }
+ | tSEC_UNIT
+ { PC.rel_seconds += $1; }
+ ;
+
+number:
+ tUNUMBER
+ {
+ if (PC.dates_seen
+ && ! PC.rels_seen && (PC.times_seen || 2 < $1.digits))
+ PC.year = $1;
+ else
+ {
+ if (4 < $1.digits)
+ {
+ PC.dates_seen++;
+ PC.day = $1.value % 100;
+ PC.month = ($1.value / 100) % 100;
+ PC.year.value = $1.value / 10000;
+ PC.year.digits = $1.digits - 4;
+ }
+ else
+ {
+ PC.times_seen++;
+ if ($1.digits <= 2)
+ {
+ PC.hour = $1.value;
+ PC.minutes = 0;
+ }
+ else
+ {
+ PC.hour = $1.value / 100;
+ PC.minutes = $1.value % 100;
+ }
+ PC.seconds = 0;
+ PC.meridian = MER24;
+ }
+ }
+ }
+ ;
+
+o_merid:
+ /* empty */
+ { $$ = MER24; }
+ | tMERIDIAN
+ { $$ = $1; }
+ ;
+
+%%
+
+/* Include this file down here because bison inserts code above which
+ may define-away `const'. We want the prototype for get_date to have
+ the same signature as the function definition. */
+#include "modules/getdate.h"
+
+#ifndef gmtime
+struct tm *gmtime ();
+#endif
+#ifndef localtime
+struct tm *localtime ();
+#endif
+#ifndef mktime
+time_t mktime ();
+#endif
+
+static table const meridian_table[] =
+{
+ { "AM", tMERIDIAN, MERam },
+ { "A.M.", tMERIDIAN, MERam },
+ { "PM", tMERIDIAN, MERpm },
+ { "P.M.", tMERIDIAN, MERpm },
+ { 0, 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 },
+ { 0, 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 },
+ { 0, 0, 0 }
+};
+
+/* Assorted relative-time words. */
+static table const relative_time_table[] =
+{
+ { "TOMORROW", tMINUTE_UNIT, 24 * 60 },
+ { "YESTERDAY",tMINUTE_UNIT, - (24 * 60) },
+ { "TODAY", tMINUTE_UNIT, 0 },
+ { "NOW", tMINUTE_UNIT, 0 },
+ { "LAST", tUNUMBER, -1 },
+ { "THIS", tUNUMBER, 0 },
+ { "NEXT", tUNUMBER, 1 },
+ { "FIRST", tUNUMBER, 1 },
+/*{ "SECOND", tUNUMBER, 2 }, */
+ { "THIRD", tUNUMBER, 3 },
+ { "FOURTH", tUNUMBER, 4 },
+ { "FIFTH", tUNUMBER, 5 },
+ { "SIXTH", tUNUMBER, 6 },
+ { "SEVENTH", tUNUMBER, 7 },
+ { "EIGHTH", tUNUMBER, 8 },
+ { "NINTH", tUNUMBER, 9 },
+ { "TENTH", tUNUMBER, 10 },
+ { "ELEVENTH", tUNUMBER, 11 },
+ { "TWELFTH", tUNUMBER, 12 },
+ { "AGO", tAGO, 1 },
+ { 0, 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 getdate to handle arbitrary time zone
+ abbreviations; use numeric abbreviations like `-0500' instead. */
+static table const time_zone_table[] =
+{
+ { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */
+ { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
+ { "UTC", tZONE, HOUR ( 0) },
+ { "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 */
+ { 0, 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) },
+ { 0, 0, 0 }
+};
+
+\f
+
+static int
+to_hour (int hours, int meridian)
+{
+ switch (meridian)
+ {
+ 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;
+ default:
+ abort ();
+ }
+ /* NOTREACHED */
+ return 0;
+}
+
+static int
+to_year (textint textyear)
+{
+ 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. */
+ 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;
+
+ /* Try local zone abbreviations first; they're 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 0;
+}
+
+#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 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,
+ but it's OK to assume that A and B are close to each other. */
+ int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
+ int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
+ int a100 = a4 / 25 - (a4 % 25 < 0);
+ int b100 = b4 / 25 - (b4 % 25 < 0);
+ int a400 = a100 >> 2;
+ int b400 = b100 >> 2;
+ int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+ int years = a->tm_year - b->tm_year;
+ 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;
+ int i;
+ int abbrev;
+
+ /* Make it uppercase. */
+ for (p = word; *p; p++)
+ if (ISLOWER ((unsigned char) *p))
+ *p = toupper ((unsigned char) *p);
+
+ 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 (i = 0, p = q = word; (*p = *q); q++)
+ if (*q == '.')
+ i = 1;
+ else
+ p++;
+ if (i && (tp = lookup_zone (pc, word)))
+ return tp;
+
+ return 0;
+}
+
+static int
+yylex (YYSTYPE *lvalp, parser_control *pc)
+{
+ unsigned char c;
+ int count;
+
+ for (;;)
+ {
+ while (c = *pc->input, ISSPACE (c))
+ pc->input++;
+
+ if (ISDIGIT (c) || c == '-' || c == '+')
+ {
+ char const *p;
+ int sign;
+ int value;
+ if (c == '-' || c == '+')
+ {
+ sign = c == '-' ? -1 : 1;
+ c = *++pc->input;
+ if (! ISDIGIT (c))
+ /* skip the '-' sign */
+ continue;
+ }
+ else
+ sign = 0;
+ p = pc->input;
+ value = 0;
+ do
+ {
+ value = 10 * value + c - '0';
+ c = *++p;
+ }
+ while (ISDIGIT (c));
+ lvalp->textintval.value = sign < 0 ? -value : value;
+ lvalp->textintval.digits = p - pc->input;
+ pc->input = p;
+ return sign ? tSNUMBER : tUNUMBER;
+ }
+
+ if (ISALPHA (c))
+ {
+ char buff[20];
+ char *p = buff;
+ table const *tp;
+
+ do
+ {
+ if (p < buff + sizeof buff - 1)
+ *p++ = c;
+ c = *++pc->input;
+ }
+ while (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 (char *s ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+/* Parse a date/time string P. Return the corresponding time_t value,
+ or (time_t) -1 if there is an error. P can be an incomplete or
+ relative time specification; if so, use *NOW as the basis for the
+ returned time. */
+time_t
+get_date (const char *p, const time_t *now)
+{
+ time_t Start = now ? *now : time (0);
+ struct tm *tmp = localtime (&Start);
+ struct tm tm;
+ struct tm tm0;
+ parser_control pc;
+
+ if (! tmp)
+ return -1;
+
+ pc.input = p;
+ pc.year.value = tmp->tm_year + TM_YEAR_BASE;
+ pc.year.digits = 4;
+ pc.month = tmp->tm_mon + 1;
+ pc.day = tmp->tm_mday;
+ pc.hour = tmp->tm_hour;
+ pc.minutes = tmp->tm_min;
+ pc.seconds = tmp->tm_sec;
+ tm.tm_isdst = tmp->tm_isdst;
+
+ pc.meridian = MER24;
+ pc.rel_seconds = 0;
+ pc.rel_minutes = 0;
+ pc.rel_hour = 0;
+ pc.rel_day = 0;
+ pc.rel_month = 0;
+ pc.rel_year = 0;
+ pc.dates_seen = 0;
+ pc.days_seen = 0;
+ pc.rels_seen = 0;
+ pc.times_seen = 0;
+ pc.local_zones_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 = 0;
+
+ /* 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 *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 = 0;
+ }
+ break;
+ }
+ }
+ }
+#else
+#if HAVE_TZNAME
+ {
+# ifndef 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 = 0;
+ }
+#else
+ pc.local_time_zone_table[0].name = 0;
+#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 = 0;
+ }
+
+ if (yyparse (&pc) != 0
+ || 1 < pc.times_seen || 1 < pc.dates_seen || 1 < pc.days_seen
+ || 1 < (pc.local_zones_seen + pc.zones_seen)
+ || (pc.local_zones_seen && 1 < pc.local_isdst))
+ return -1;
+
+ tm.tm_year = to_year (pc.year) - TM_YEAR_BASE + pc.rel_year;
+ tm.tm_mon = pc.month - 1 + pc.rel_month;
+ tm.tm_mday = pc.day + pc.rel_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)
+ return -1;
+ tm.tm_min = pc.minutes;
+ tm.tm_sec = pc.seconds;
+ }
+ else
+ {
+ tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+ }
+
+ /* Let mktime deduce tm_isdst if we have an absolute time stamp,
+ or if the relative time stamp mentions days, months, or years. */
+ if (pc.dates_seen | pc.days_seen | pc.times_seen | pc.rel_day
+ | pc.rel_month | pc.rel_year)
+ 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 (Start == (time_t) -1)
+ {
+
+ /* Guard against falsely reporting errors near the time_t boundaries
+ when parsing times in other time zones. For example, if the min
+ time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead
+ of UTC, then the min localtime value is 1970-01-01 08:00:00; if
+ we apply mktime to 1970-01-01 00:00:00 we will get an error, so
+ we apply mktime to 1970-01-02 08:00:00 instead and adjust the time
+ zone by 24 hours to compensate. This algorithm assumes that
+ there is no DST transition within a day of the time_t boundaries. */
+ if (pc.zones_seen)
+ {
+ tm = tm0;
+ if (tm.tm_year <= EPOCH_YEAR - TM_YEAR_BASE)
+ {
+ tm.tm_mday++;
+ pc.time_zone += 24 * 60;
+ }
+ else
+ {
+ tm.tm_mday--;
+ pc.time_zone -= 24 * 60;
+ }
+ Start = mktime (&tm);
+ }
+
+ if (Start == (time_t) -1)
+ return Start;
+ }
+
+ 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_isdst = -1;
+ Start = mktime (&tm);
+ if (Start == (time_t) -1)
+ return Start;
+ }
+
+ if (pc.zones_seen)
+ {
+ int delta = pc.time_zone * 60;
+#ifdef HAVE_TM_GMTOFF
+ delta -= tm.tm_gmtoff;
+#else
+ struct tm *gmt = gmtime (&Start);
+ if (! gmt)
+ return -1;
+ delta -= tm_diff (&tm, gmt);
+#endif
+ if ((Start < Start - delta) != (delta < 0))
+ return -1; /* time_t overflow */
+ Start -= delta;
+ }
+
+ /* Add relative hours, minutes, and seconds. Ignore leap seconds;
+ i.e. "+ 10 minutes" means 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. */
+ {
+ time_t t0 = Start;
+ long d1 = 60 * 60 * (long) pc.rel_hour;
+ time_t t1 = t0 + d1;
+ long d2 = 60 * (long) pc.rel_minutes;
+ time_t t2 = t1 + d2;
+ int d3 = pc.rel_seconds;
+ time_t t3 = t2 + d3;
+ if ((d1 / (60 * 60) ^ pc.rel_hour)
+ | (d2 / 60 ^ pc.rel_minutes)
+ | ((t0 + d1 < t0) ^ (d1 < 0))
+ | ((t1 + d2 < t1) ^ (d2 < 0))
+ | ((t2 + d3 < t2) ^ (d3 < 0)))
+ return -1;
+ Start = t3;
+ }
+
+ return Start;
+}
+
+#if TEST
+
+#include <stdio.h>
+
+int
+main (int ac, char **av)
+{
+ char buff[BUFSIZ];
+ time_t d;
+
+ printf ("Enter date, or blank line to exit.\n\t> ");
+ fflush (stdout);
+
+ buff[BUFSIZ - 1] = 0;
+ while (fgets (buff, BUFSIZ - 1, stdin) && buff[0])
+ {
+ d = get_date (buff, 0);
+ if (d == (time_t) -1)
+ printf ("Bad format - couldn't convert.\n");
+ else
+ printf ("%s", ctime (&d));
+ printf ("\t> ");
+ fflush (stdout);
+ }
+ return 0;
+}
+#endif /* defined TEST */
projects / samba / blobdiff