| %{ |
| /** |
| * Parse a string into an internal timestamp. |
| * |
| * This file is based on gnulib parse-datetime.y-dd7a871 with |
| * the other gnulib dependencies removed for use in util-linux. |
| * |
| * Copyright (C) 1999-2000, 2002-2017 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 timestamps, and in October 2004 to support |
| * TZ strings in dates. |
| */ |
| |
| /** |
| * FIXME: Check for arithmetic overflow in all cases, not just |
| * some of them. |
| */ |
| |
| #include <sys/time.h> |
| #include <time.h> |
| |
| #include "c.h" |
| #include "timeutils.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 <inttypes.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| |
| #include <stdarg.h> |
| #include "cctype.h" |
| #include "nls.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 |
| |
| /** |
| * 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 TM_YEAR_BASE 1900 |
| |
| #define HOUR(x) ((x) * 60) |
| |
| #define STREQ(a, b) (strcmp (a, b) == 0) |
| |
| /** |
| * Convert a possibly-signed character to an unsigned character. This is |
| * a bit safer than casting to unsigned char, since it catches some type |
| * errors that the cast doesn't. |
| */ |
| static unsigned char to_uchar (char ch) { return ch; } |
| |
| /** |
| * 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 { |
| int negative; |
| intmax_t 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 year, month, day, hour, minutes, seconds, and nanoseconds. */ |
| typedef struct { |
| intmax_t year; |
| intmax_t month; |
| intmax_t day; |
| intmax_t hour; |
| intmax_t minutes; |
| time_t seconds; |
| 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. */ |
| intmax_t 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, seconds, and ns. */ |
| textint year; |
| intmax_t month; |
| intmax_t day; |
| intmax_t hour; |
| intmax_t minutes; |
| struct timespec seconds; /* includes nanoseconds */ |
| |
| /* Relative year, month, day, hour, minutes, seconds, and ns. */ |
| relative_time rel; |
| |
| /* Presence or counts of some nonterminals parsed so far. */ |
| int timespec_seen; |
| int 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 abbreviations, null terminated. */ |
| 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 int time_zone_hhmm (parser_control *, textint, textint); |
| |
| /** |
| * 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 = 1; |
| } |
| |
| /* Set PC-> hour, minutes, seconds and nanoseconds members from arguments. */ |
| static void |
| set_hhmmss(parser_control *pc, intmax_t hour, intmax_t minutes, |
| time_t sec, 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 31 shift/reduce conflicts. */ |
| %expect 31 |
| |
| %union { |
| intmax_t intval; |
| textint textintval; |
| struct timespec timespec; |
| relative_time rel; |
| } |
| |
| %token <intval> tAGO |
| %token 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 <textintval> o_colon_minutes |
| %type <timespec> seconds signed_seconds unsigned_seconds |
| |
| %type <rel> relunit relunit_snumber dayshift |
| |
| %% |
| |
| spec: |
| timespec |
| | items |
| ; |
| |
| timespec: |
| '@' seconds { |
| pc->seconds = $2; |
| pc->timespec_seen = 1; |
| } |
| ; |
| |
| items: |
| /* empty */ |
| | items item |
| ; |
| |
| item: |
| datetime { |
| pc->times_seen++; pc->dates_seen++; |
| } |
| | 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 |
| ; |
| |
| datetime: |
| iso_8601_datetime |
| ; |
| |
| iso_8601_datetime: |
| iso_8601_date 'T' iso_8601_time |
| ; |
| |
| time: |
| tUNUMBER tMERIDIAN { |
| set_hhmmss (pc, $1.value, 0, 0, 0); |
| pc->meridian = $2; |
| } |
| | tUNUMBER ':' tUNUMBER tMERIDIAN { |
| set_hhmmss (pc, $1.value, $3.value, 0, 0); |
| pc->meridian = $4; |
| } |
| | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tMERIDIAN { |
| set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec); |
| pc->meridian = $6; |
| } |
| | iso_8601_time |
| ; |
| |
| iso_8601_time: |
| tUNUMBER zone_offset { |
| set_hhmmss (pc, $1.value, 0, 0, 0); |
| pc->meridian = MER24; |
| } |
| | tUNUMBER ':' tUNUMBER o_zone_offset { |
| set_hhmmss (pc, $1.value, $3.value, 0, 0); |
| pc->meridian = MER24; |
| } |
| | tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_zone_offset { |
| set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec); |
| pc->meridian = MER24; |
| } |
| ; |
| |
| o_zone_offset: |
| /* empty */ |
| | zone_offset |
| ; |
| |
| zone_offset: |
| tSNUMBER o_colon_minutes { |
| pc->zones_seen++; |
| if (! time_zone_hhmm (pc, $1, $2)) YYABORT; |
| } |
| ; |
| |
| /** |
| * Local zone strings only affect DST setting, |
| * and only take affect if the current TZ setting is relevant. |
| * |
| * Example 1: |
| * 'EEST' is parsed as tLOCAL_ZONE, as it relates to the effective TZ: |
| * TZ=Europe/Helsinki date -d '2016-12-30 EEST' |
| * |
| * Example 2: |
| * 'EEST' is parsed as 'zone' (TZ=+03:00): |
| * TZ=Asia/Tokyo ./src/date --debug -d '2011-06-11 EEST' |
| * |
| * This is implemented by probing the next three calendar quarters |
| * of the effective timezone and looking for DST changes - |
| * if found, the timezone name (EEST) is inserted into |
| * the lexical lookup table with type tLOCAL_ZONE. |
| * (Search for 'quarter' comment in 'parse_date'). |
| */ |
| 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; |
| } |
| ; |
| |
| /** |
| * Note 'T' is a special case, as it is used as the separator in ISO |
| * 8601 date and time of day representation. |
| */ |
| zone: |
| tZONE { |
| pc->time_zone = $1; |
| } |
| | 'T' { |
| pc->time_zone = HOUR(7); |
| } |
| | tZONE relunit_snumber { |
| pc->time_zone = $1; |
| apply_relative_time (pc, $2, 1); |
| } |
| | 'T' relunit_snumber { |
| pc->time_zone = HOUR(7); |
| apply_relative_time (pc, $2, 1); |
| } |
| | tZONE tSNUMBER o_colon_minutes { |
| if (! time_zone_hhmm (pc, $2, $3)) YYABORT; |
| pc->time_zone += $1; |
| } |
| | 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 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; |
| } |
| | iso_8601_date |
| ; |
| |
| iso_8601_date: |
| tUNUMBER tSNUMBER tSNUMBER { |
| /* ISO 8601 format.YYYY-MM-DD. */ |
| pc->year = $1; |
| pc->month = -$2.value; |
| pc->day = -$3.value; |
| } |
| ; |
| |
| rel: |
| relunit tAGO |
| { apply_relative_time (pc, $1, $2); } |
| | 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 */ |
| { $$.value = $$.digits = 0; } |
| | ':' tUNUMBER { |
| $$ = $2; |
| } |
| ; |
| |
| %% |
| |
| 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 }, |
| { "HENCE", tAGO, 1 }, |
| { NULL, 0, 0 } |
| }; |
| |
| /** |
| * The universal time zone table. These labels can be used even for |
| * timestamps that would not otherwise be valid, e.g., GMT timestamps |
| * 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_date 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. |
| * |
| * Note 'T' is a special case, as it is used as the separator in ISO |
| * 8601 date and time of day representation. |
| */ |
| 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", 'T', 0 }, |
| { "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 } |
| }; |
| |
| /** |
| * Convert a time offset expressed as HH:MM or HHMM into an integer count of |
| * minutes. If hh is more than 2 digits then it is of the form HHMM and must be |
| * delimited; in that case 'mm' is required to be absent. Otherwise, hh and mm |
| * are used ('mm' contains digits that were prefixed with a colon). |
| * |
| * POSIX TZ and ISO 8601 both define the maximum offset as 24:59. POSIX also |
| * allows seconds, but currently the parser rejects them. Both require minutes |
| * to be zero padded (2 digits). ISO requires hours to be zero padded, POSIX |
| * does not, either is accepted; which means an invalid ISO offset could pass. |
| */ |
| |
| static int time_zone_hhmm(parser_control *pc, textint hh, textint mm) |
| { |
| int h, m; |
| |
| if (hh.digits > 2 && hh.digits < 5 && mm.digits == 0) { |
| h = hh.value / 100; |
| m = hh.value % 100; |
| } else if (hh.digits < 3 && (mm.digits == 0 || mm.digits == 2)) { |
| h = hh.value; |
| m = hh.negative ? -mm.value : mm.value; |
| } else |
| return 0; |
| |
| if (abs(h) > 24 || abs(m) > 59) |
| return 0; |
| |
| pc->time_zone = h * 60 + m; |
| return 1; |
| } |
| |
| static int to_hour(intmax_t 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) |
| { |
| intmax_t 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 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); |
| 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 period_found; |
| int abbrev; |
| |
| /* Make it uppercase. */ |
| for (p = word; *p; p++) |
| *p = c_toupper (to_uchar (*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 (period_found = 0, p = q = word; (*p = *q); q++) |
| if (*q == '.') |
| period_found = 1; |
| else |
| p++; |
| if (period_found && (tp = lookup_zone (pc, word))) |
| return tp; |
| |
| return NULL; |
| } |
| |
| static int yylex (union YYSTYPE *lvalp, parser_control *pc) |
| { |
| unsigned char c; |
| size_t count; |
| |
| for (;;) { |
| while (c = *pc->input, c_isspace (c)) |
| pc->input++; |
| |
| if (c_isdigit (c) || c == '-' || c == '+') { |
| char const *p; |
| int sign; |
| uintmax_t value; |
| if (c == '-' || c == '+') { |
| sign = c == '-' ? -1 : 1; |
| while (c = *++pc->input, c_isspace (c)) |
| continue; |
| if (! c_isdigit (c)) |
| /* skip the '-' sign */ |
| continue; |
| } else |
| sign = 0; |
| p = pc->input; |
| for (value = 0; ; value *= 10) { |
| uintmax_t value1 = value + (c - '0'); |
| if (value1 < value) |
| return '?'; |
| value = value1; |
| c = *++p; |
| if (! c_isdigit (c)) |
| break; |
| if (UINTMAX_MAX / 10 < value) |
| return '?'; |
| } |
| if ((c == '.' || c == ',') && c_isdigit (p[1])) { |
| time_t s; |
| int ns; |
| int digits; |
| uintmax_t 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 (c_isdigit (*p)) |
| ns += *p++ - '0'; |
| } |
| |
| /* Skip excess digits, truncating toward |
| * -Infinity. |
| */ |
| if (sign < 0) |
| for (; c_isdigit (*p); p++) |
| if (*p != '0') { |
| ns++; |
| break; |
| } |
| while (c_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 to_uchar (*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 __attribute__((__unused__)), |
| char const *s __attribute__((__unused__))) |
| { |
| return 0; |
| } |
| |
| /** |
| * If *TM0 is the old and *TM1 is the new value of a struct tm after |
| * passing it to mktime, return 1 if it's OK that mktime returned T. |
| * It's not OK if *TM0 has out-of-range members. |
| */ |
| |
| static int 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 |
| * timestamp that happens to equal (time_t) -1, on a host that |
| * supports such a timestamp. |
| */ |
| tm1 = localtime (&t); |
| if (!tm1) |
| return 0; |
| } |
| |
| 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) |
| : strdup (tz)); |
| } |
| return tz; |
| } |
| |
| /** |
| * Parse a date/time string, storing the resulting time value into *result. |
| * The string itself is pointed to by *p. Return 1 if successful. |
| * *p can be an incomplete or relative time specification; if so, use |
| * *now as the basis for the returned time. |
| */ |
| int parse_date(struct timespec *result, char const *p, |
| struct timespec const *now) |
| { |
| time_t Start; |
| intmax_t Start_ns; |
| struct tm const *tmp; |
| struct tm tm; |
| struct tm tm0; |
| parser_control pc; |
| struct timespec gettime_buffer; |
| unsigned char c; |
| int tz_was_altered = 0; |
| char *tz0 = NULL; |
| char tz0buf[TZBUFSIZE]; |
| int ok = 1; |
| struct timeval tv; |
| |
| if (! now) { |
| gettimeofday (&tv, NULL); |
| gettime_buffer.tv_sec = tv.tv_sec; |
| gettime_buffer.tv_nsec = tv.tv_usec * 1000; |
| now = &gettime_buffer; |
| } |
| |
| Start = now->tv_sec; |
| Start_ns = now->tv_nsec; |
| |
| tmp = localtime (&now->tv_sec); |
| if (! tmp) |
| return 0; |
| |
| 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]; |
| int large_tz = TZBUFSIZE < tzsize; |
| int setenv_ok; |
| |
| tz0 = get_tz (tz0buf); |
| if (!tz0) |
| goto fail; |
| |
| if (large_tz) { |
| z = tz1 = malloc (tzsize); |
| if (!tz1) |
| goto fail; |
| } else |
| z = tz1 = 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 = 1; |
| |
| p = s + 1; |
| while (c = *p, c_isspace (c)) |
| p++; |
| |
| break; |
| } |
| } |
| |
| /** |
| * 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 = 0; |
| pc.rels_seen = 0; |
| 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 abbreviation 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 timestamp. |
| */ |
| 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. |
| */ |
| |
| intmax_t time_zone = pc.time_zone; |
| |
| intmax_t abs_time_zone = time_zone < 0 |
| ? - time_zone : time_zone; |
| |
| intmax_t 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%jd:%02d", |
| &"-"[time_zone < 0], |
| abs_time_zone_hour, |
| abs_time_zone_min); |
| if (setenv ("TZ", tz1buf, 1) != 0) { |
| goto fail; |
| } |
| tz_was_altered = 1; |
| 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) { |
| intmax_t 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. |
| */ |
| intmax_t sum_ns = pc.seconds.tv_nsec + pc.rel.ns; |
| intmax_t normalized_ns = (sum_ns % BILLION + BILLION) % BILLION; |
| time_t t0 = Start; |
| intmax_t d1 = 60 * 60 * pc.rel.hour; |
| time_t t1 = t0 + d1; |
| intmax_t d2 = 60 * pc.rel.minutes; |
| time_t t2 = t1 + d2; |
| time_t d3 = pc.rel.seconds; |
| time_t t3 = t2 + d3; |
| intmax_t d4 = (sum_ns - normalized_ns) / BILLION; |
| 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 = 0; |
| done: |
| if (tz_was_altered) |
| ok &= (tz0 ? setenv ("TZ", tz0, 1) |
| : unsetenv ("TZ")) == 0; |
| if (tz0 != tz0buf) |
| free (tz0); |
| return ok; |
| } |