| 1 | %{
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| 2 | /* Parse a string into an internal time stamp.
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| 3 | Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Originally written by Steven M. Bellovin <smb@research.att.com> while
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| 19 | at the University of North Carolina at Chapel Hill. Later tweaked by
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| 20 | a couple of people on Usenet. Completely overhauled by Rich $alz
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| 21 | <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.
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| 22 |
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| 23 | Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do
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| 24 | the right thing about local DST. Unlike previous versions, this
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| 25 | version is reentrant. */
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| 26 |
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| 27 | #ifdef HAVE_CONFIG_H
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| 28 | # include <config.h>
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| 29 | # ifdef HAVE_ALLOCA_H
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| 30 | # include <alloca.h>
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| 31 | # endif
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| 32 | #endif
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| 33 |
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| 34 | /* Since the code of getdate.y is not included in the Emacs executable
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| 35 | itself, there is no need to #define static in this file. Even if
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| 36 | the code were included in the Emacs executable, it probably
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| 37 | wouldn't do any harm to #undef it here; this will only cause
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| 38 | problems if we try to write to a static variable, which I don't
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| 39 | think this code needs to do. */
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| 40 | #ifdef emacs
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| 41 | # undef static
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| 42 | #endif
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| 43 |
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| 44 | #include <ctype.h>
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| 45 | #include <string.h>
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| 46 |
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| 47 | #if HAVE_STDLIB_H
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| 48 | # include <stdlib.h> /* for `free'; used by Bison 1.27 */
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| 49 | #endif
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| 50 |
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| 51 | #if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
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| 52 | # define IN_CTYPE_DOMAIN(c) 1
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| 53 | #else
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| 54 | # define IN_CTYPE_DOMAIN(c) isascii (c)
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| 55 | #endif
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| 56 |
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| 57 | #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
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| 58 | #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
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| 59 | #define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
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| 60 | #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
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| 61 |
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| 62 | /* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
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| 63 | - Its arg may be any int or unsigned int; it need not be an unsigned char.
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| 64 | - It's guaranteed to evaluate its argument exactly once.
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| 65 | - It's typically faster.
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| 66 | POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
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| 67 | ISDIGIT_LOCALE unless it's important to use the locale's definition
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| 68 | of `digit' even when the host does not conform to POSIX. */
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| 69 | #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
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| 70 |
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| 71 | #if STDC_HEADERS || HAVE_STRING_H
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| 72 | # include <string.h>
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| 73 | #endif
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| 74 |
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| 75 | #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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| 76 | # define __attribute__(x)
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| 77 | #endif
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| 78 |
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| 79 | #ifndef ATTRIBUTE_UNUSED
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| 80 | # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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| 81 | #endif
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| 82 |
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| 83 | #define EPOCH_YEAR 1970
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| 84 | #define TM_YEAR_BASE 1900
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| 85 |
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| 86 | #define HOUR(x) ((x) * 60)
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| 87 |
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| 88 | /* An integer value, and the number of digits in its textual
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| 89 | representation. */
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| 90 | typedef struct
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| 91 | {
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| 92 | int value;
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| 93 | int digits;
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| 94 | } textint;
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| 95 |
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| 96 | /* An entry in the lexical lookup table. */
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| 97 | typedef struct
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| 98 | {
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| 99 | char const *name;
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| 100 | int type;
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| 101 | int value;
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| 102 | } table;
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| 103 |
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| 104 | /* Meridian: am, pm, or 24-hour style. */
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| 105 | enum { MERam, MERpm, MER24 };
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| 106 |
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| 107 | /* Information passed to and from the parser. */
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| 108 | typedef struct
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| 109 | {
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| 110 | /* The input string remaining to be parsed. */
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| 111 | const char *input;
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| 112 |
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| 113 | /* N, if this is the Nth Tuesday. */
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| 114 | int day_ordinal;
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| 115 |
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| 116 | /* Day of week; Sunday is 0. */
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| 117 | int day_number;
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| 118 |
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| 119 | /* tm_isdst flag for the local zone. */
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| 120 | int local_isdst;
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| 121 |
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| 122 | /* Time zone, in minutes east of UTC. */
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| 123 | int time_zone;
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| 124 |
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| 125 | /* Style used for time. */
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| 126 | int meridian;
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| 127 |
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| 128 | /* Gregorian year, month, day, hour, minutes, and seconds. */
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| 129 | textint year;
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| 130 | int month;
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| 131 | int day;
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| 132 | int hour;
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| 133 | int minutes;
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| 134 | int seconds;
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| 135 |
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| 136 | /* Relative year, month, day, hour, minutes, and seconds. */
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| 137 | int rel_year;
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| 138 | int rel_month;
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| 139 | int rel_day;
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| 140 | int rel_hour;
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| 141 | int rel_minutes;
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| 142 | int rel_seconds;
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| 143 |
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| 144 | /* Counts of nonterminals of various flavors parsed so far. */
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| 145 | int dates_seen;
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| 146 | int days_seen;
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| 147 | int local_zones_seen;
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| 148 | int rels_seen;
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| 149 | int times_seen;
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| 150 | int zones_seen;
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| 151 |
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| 152 | /* Table of local time zone abbrevations, terminated by a null entry. */
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| 153 | table local_time_zone_table[3];
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| 154 | } parser_control;
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| 155 |
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| 156 | #define PC (* (parser_control *) parm)
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| 157 | #define YYLEX_PARAM parm
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| 158 | #define YYPARSE_PARAM parm
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| 159 |
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| 160 | static int yyerror ();
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| 161 | static int yylex ();
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| 162 |
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| 163 | %}
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| 164 |
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| 165 | /* We want a reentrant parser. */
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| 166 | %pure_parser
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| 167 |
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| 168 | /* This grammar has 13 shift/reduce conflicts. */
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| 169 | %expect 13
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| 170 |
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| 171 | %union
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| 172 | {
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| 173 | int intval;
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| 174 | textint textintval;
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| 175 | }
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| 176 |
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| 177 | %token tAGO tDST
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| 178 |
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| 179 | %token <intval> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tLOCAL_ZONE tMERIDIAN
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| 180 | %token <intval> tMINUTE_UNIT tMONTH tMONTH_UNIT tSEC_UNIT tYEAR_UNIT tZONE
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| 181 |
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| 182 | %token <textintval> tSNUMBER tUNUMBER
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| 183 |
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| 184 | %type <intval> o_merid
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| 185 |
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| 186 | %%
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| 187 |
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| 188 | spec:
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| 189 | /* empty */
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| 190 | | spec item
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| 191 | ;
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| 192 |
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| 193 | item:
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| 194 | time
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| 195 | { PC.times_seen++; }
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| 196 | | local_zone
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| 197 | { PC.local_zones_seen++; }
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| 198 | | zone
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| 199 | { PC.zones_seen++; }
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| 200 | | date
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| 201 | { PC.dates_seen++; }
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| 202 | | day
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| 203 | { PC.days_seen++; }
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| 204 | | rel
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| 205 | { PC.rels_seen++; }
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| 206 | | number
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| 207 | ;
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| 208 |
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| 209 | time:
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| 210 | tUNUMBER tMERIDIAN
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| 211 | {
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| 212 | PC.hour = $1.value;
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| 213 | PC.minutes = 0;
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| 214 | PC.seconds = 0;
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| 215 | PC.meridian = $2;
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| 216 | }
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| 217 | | tUNUMBER ':' tUNUMBER o_merid
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| 218 | {
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| 219 | PC.hour = $1.value;
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| 220 | PC.minutes = $3.value;
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| 221 | PC.seconds = 0;
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| 222 | PC.meridian = $4;
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| 223 | }
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| 224 | | tUNUMBER ':' tUNUMBER tSNUMBER
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| 225 | {
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| 226 | PC.hour = $1.value;
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| 227 | PC.minutes = $3.value;
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| 228 | PC.meridian = MER24;
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| 229 | PC.zones_seen++;
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| 230 | PC.time_zone = $4.value % 100 + ($4.value / 100) * 60;
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| 231 | }
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| 232 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid
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| 233 | {
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| 234 | PC.hour = $1.value;
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| 235 | PC.minutes = $3.value;
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| 236 | PC.seconds = $5.value;
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| 237 | PC.meridian = $6;
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| 238 | }
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| 239 | | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER
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| 240 | {
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| 241 | PC.hour = $1.value;
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| 242 | PC.minutes = $3.value;
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| 243 | PC.seconds = $5.value;
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| 244 | PC.meridian = MER24;
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| 245 | PC.zones_seen++;
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| 246 | PC.time_zone = $6.value % 100 + ($6.value / 100) * 60;
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| 247 | }
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| 248 | ;
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| 249 |
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| 250 | local_zone:
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| 251 | tLOCAL_ZONE
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| 252 | { PC.local_isdst = $1; }
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| 253 | | tLOCAL_ZONE tDST
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| 254 | { PC.local_isdst = $1 < 0 ? 1 : $1 + 1; }
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| 255 | ;
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| 256 |
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| 257 | zone:
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| 258 | tZONE
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| 259 | { PC.time_zone = $1; }
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| 260 | | tDAYZONE
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| 261 | { PC.time_zone = $1 + 60; }
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| 262 | | tZONE tDST
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| 263 | { PC.time_zone = $1 + 60; }
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| 264 | ;
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| 265 |
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| 266 | day:
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| 267 | tDAY
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| 268 | {
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| 269 | PC.day_ordinal = 1;
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| 270 | PC.day_number = $1;
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| 271 | }
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| 272 | | tDAY ','
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| 273 | {
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| 274 | PC.day_ordinal = 1;
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| 275 | PC.day_number = $1;
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| 276 | }
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| 277 | | tUNUMBER tDAY
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| 278 | {
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| 279 | PC.day_ordinal = $1.value;
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| 280 | PC.day_number = $2;
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| 281 | }
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| 282 | ;
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| 283 |
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| 284 | date:
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| 285 | tUNUMBER '/' tUNUMBER
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| 286 | {
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| 287 | PC.month = $1.value;
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| 288 | PC.day = $3.value;
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| 289 | }
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| 290 | | tUNUMBER '/' tUNUMBER '/' tUNUMBER
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| 291 | {
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| 292 | /* Interpret as YYYY/MM/DD if the first value has 4 or more digits,
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| 293 | otherwise as MM/DD/YY.
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| 294 | The goal in recognizing YYYY/MM/DD is solely to support legacy
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| 295 | machine-generated dates like those in an RCS log listing. If
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| 296 | you want portability, use the ISO 8601 format. */
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| 297 | if (4 <= $1.digits)
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| 298 | {
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| 299 | PC.year = $1;
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| 300 | PC.month = $3.value;
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| 301 | PC.day = $5.value;
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| 302 | }
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| 303 | else
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| 304 | {
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| 305 | PC.month = $1.value;
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| 306 | PC.day = $3.value;
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| 307 | PC.year = $5;
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| 308 | }
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| 309 | }
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| 310 | | tUNUMBER tSNUMBER tSNUMBER
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| 311 | {
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| 312 | /* ISO 8601 format. YYYY-MM-DD. */
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| 313 | PC.year = $1;
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| 314 | PC.month = -$2.value;
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| 315 | PC.day = -$3.value;
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| 316 | }
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| 317 | | tUNUMBER tMONTH tSNUMBER
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| 318 | {
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| 319 | /* e.g. 17-JUN-1992. */
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| 320 | PC.day = $1.value;
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| 321 | PC.month = $2;
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| 322 | PC.year.value = -$3.value;
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| 323 | PC.year.digits = $3.digits;
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| 324 | }
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| 325 | | tMONTH tUNUMBER
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| 326 | {
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| 327 | PC.month = $1;
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| 328 | PC.day = $2.value;
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| 329 | }
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| 330 | | tMONTH tUNUMBER ',' tUNUMBER
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| 331 | {
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| 332 | PC.month = $1;
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| 333 | PC.day = $2.value;
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| 334 | PC.year = $4;
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| 335 | }
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| 336 | | tUNUMBER tMONTH
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| 337 | {
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| 338 | PC.day = $1.value;
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| 339 | PC.month = $2;
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| 340 | }
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| 341 | | tUNUMBER tMONTH tUNUMBER
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| 342 | {
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| 343 | PC.day = $1.value;
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| 344 | PC.month = $2;
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| 345 | PC.year = $3;
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| 346 | }
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| 347 | ;
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| 348 |
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| 349 | rel:
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| 350 | relunit tAGO
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| 351 | {
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| 352 | PC.rel_seconds = -PC.rel_seconds;
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| 353 | PC.rel_minutes = -PC.rel_minutes;
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| 354 | PC.rel_hour = -PC.rel_hour;
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| 355 | PC.rel_day = -PC.rel_day;
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| 356 | PC.rel_month = -PC.rel_month;
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| 357 | PC.rel_year = -PC.rel_year;
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| 358 | }
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| 359 | | relunit
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| 360 | ;
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| 361 |
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| 362 | relunit:
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| 363 | tUNUMBER tYEAR_UNIT
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| 364 | { PC.rel_year += $1.value * $2; }
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| 365 | | tSNUMBER tYEAR_UNIT
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| 366 | { PC.rel_year += $1.value * $2; }
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| 367 | | tYEAR_UNIT
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| 368 | { PC.rel_year += $1; }
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| 369 | | tUNUMBER tMONTH_UNIT
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| 370 | { PC.rel_month += $1.value * $2; }
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| 371 | | tSNUMBER tMONTH_UNIT
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| 372 | { PC.rel_month += $1.value * $2; }
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| 373 | | tMONTH_UNIT
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| 374 | { PC.rel_month += $1; }
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| 375 | | tUNUMBER tDAY_UNIT
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| 376 | { PC.rel_day += $1.value * $2; }
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| 377 | | tSNUMBER tDAY_UNIT
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| 378 | { PC.rel_day += $1.value * $2; }
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| 379 | | tDAY_UNIT
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| 380 | { PC.rel_day += $1; }
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| 381 | | tUNUMBER tHOUR_UNIT
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| 382 | { PC.rel_hour += $1.value * $2; }
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| 383 | | tSNUMBER tHOUR_UNIT
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| 384 | { PC.rel_hour += $1.value * $2; }
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| 385 | | tHOUR_UNIT
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| 386 | { PC.rel_hour += $1; }
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| 387 | | tUNUMBER tMINUTE_UNIT
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| 388 | { PC.rel_minutes += $1.value * $2; }
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| 389 | | tSNUMBER tMINUTE_UNIT
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| 390 | { PC.rel_minutes += $1.value * $2; }
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| 391 | | tMINUTE_UNIT
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| 392 | { PC.rel_minutes += $1; }
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| 393 | | tUNUMBER tSEC_UNIT
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| 394 | { PC.rel_seconds += $1.value * $2; }
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| 395 | | tSNUMBER tSEC_UNIT
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| 396 | { PC.rel_seconds += $1.value * $2; }
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| 397 | | tSEC_UNIT
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| 398 | { PC.rel_seconds += $1; }
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| 399 | ;
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| 400 |
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| 401 | number:
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| 402 | tUNUMBER
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| 403 | {
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| 404 | if (PC.dates_seen
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| 405 | && ! PC.rels_seen && (PC.times_seen || 2 < $1.digits))
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| 406 | PC.year = $1;
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| 407 | else
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| 408 | {
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| 409 | if (4 < $1.digits)
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| 410 | {
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| 411 | PC.dates_seen++;
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| 412 | PC.day = $1.value % 100;
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| 413 | PC.month = ($1.value / 100) % 100;
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| 414 | PC.year.value = $1.value / 10000;
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| 415 | PC.year.digits = $1.digits - 4;
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|---|
| 416 | }
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| 417 | else
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| 418 | {
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| 419 | PC.times_seen++;
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| 420 | if ($1.digits <= 2)
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|---|
| 421 | {
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| 422 | PC.hour = $1.value;
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|---|
| 423 | PC.minutes = 0;
|
|---|
| 424 | }
|
|---|
| 425 | else
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|---|
| 426 | {
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|---|
| 427 | PC.hour = $1.value / 100;
|
|---|
| 428 | PC.minutes = $1.value % 100;
|
|---|
| 429 | }
|
|---|
| 430 | PC.seconds = 0;
|
|---|
| 431 | PC.meridian = MER24;
|
|---|
| 432 | }
|
|---|
| 433 | }
|
|---|
| 434 | }
|
|---|
| 435 | ;
|
|---|
| 436 |
|
|---|
| 437 | o_merid:
|
|---|
| 438 | /* empty */
|
|---|
| 439 | { $$ = MER24; }
|
|---|
| 440 | | tMERIDIAN
|
|---|
| 441 | { $$ = $1; }
|
|---|
| 442 | ;
|
|---|
| 443 |
|
|---|
| 444 | %%
|
|---|
| 445 |
|
|---|
| 446 | /* Include this file down here because bison inserts code above which
|
|---|
| 447 | may define-away `const'. We want the prototype for get_date to have
|
|---|
| 448 | the same signature as the function definition. */
|
|---|
| 449 | #include "modules/getdate.h"
|
|---|
| 450 |
|
|---|
| 451 | #ifndef gmtime
|
|---|
| 452 | struct tm *gmtime ();
|
|---|
| 453 | #endif
|
|---|
| 454 | #ifndef localtime
|
|---|
| 455 | struct tm *localtime ();
|
|---|
| 456 | #endif
|
|---|
| 457 | #ifndef mktime
|
|---|
| 458 | time_t mktime ();
|
|---|
| 459 | #endif
|
|---|
| 460 |
|
|---|
| 461 | static table const meridian_table[] =
|
|---|
| 462 | {
|
|---|
| 463 | { "AM", tMERIDIAN, MERam },
|
|---|
| 464 | { "A.M.", tMERIDIAN, MERam },
|
|---|
| 465 | { "PM", tMERIDIAN, MERpm },
|
|---|
| 466 | { "P.M.", tMERIDIAN, MERpm },
|
|---|
| 467 | { 0, 0, 0 }
|
|---|
| 468 | };
|
|---|
| 469 |
|
|---|
| 470 | static table const dst_table[] =
|
|---|
| 471 | {
|
|---|
| 472 | { "DST", tDST, 0 }
|
|---|
| 473 | };
|
|---|
| 474 |
|
|---|
| 475 | static table const month_and_day_table[] =
|
|---|
| 476 | {
|
|---|
| 477 | { "JANUARY", tMONTH, 1 },
|
|---|
| 478 | { "FEBRUARY", tMONTH, 2 },
|
|---|
| 479 | { "MARCH", tMONTH, 3 },
|
|---|
| 480 | { "APRIL", tMONTH, 4 },
|
|---|
| 481 | { "MAY", tMONTH, 5 },
|
|---|
| 482 | { "JUNE", tMONTH, 6 },
|
|---|
| 483 | { "JULY", tMONTH, 7 },
|
|---|
| 484 | { "AUGUST", tMONTH, 8 },
|
|---|
| 485 | { "SEPTEMBER",tMONTH, 9 },
|
|---|
| 486 | { "SEPT", tMONTH, 9 },
|
|---|
| 487 | { "OCTOBER", tMONTH, 10 },
|
|---|
| 488 | { "NOVEMBER", tMONTH, 11 },
|
|---|
| 489 | { "DECEMBER", tMONTH, 12 },
|
|---|
| 490 | { "SUNDAY", tDAY, 0 },
|
|---|
| 491 | { "MONDAY", tDAY, 1 },
|
|---|
| 492 | { "TUESDAY", tDAY, 2 },
|
|---|
| 493 | { "TUES", tDAY, 2 },
|
|---|
| 494 | { "WEDNESDAY",tDAY, 3 },
|
|---|
| 495 | { "WEDNES", tDAY, 3 },
|
|---|
| 496 | { "THURSDAY", tDAY, 4 },
|
|---|
| 497 | { "THUR", tDAY, 4 },
|
|---|
| 498 | { "THURS", tDAY, 4 },
|
|---|
| 499 | { "FRIDAY", tDAY, 5 },
|
|---|
| 500 | { "SATURDAY", tDAY, 6 },
|
|---|
| 501 | { 0, 0, 0 }
|
|---|
| 502 | };
|
|---|
| 503 |
|
|---|
| 504 | static table const time_units_table[] =
|
|---|
| 505 | {
|
|---|
| 506 | { "YEAR", tYEAR_UNIT, 1 },
|
|---|
| 507 | { "MONTH", tMONTH_UNIT, 1 },
|
|---|
| 508 | { "FORTNIGHT",tDAY_UNIT, 14 },
|
|---|
| 509 | { "WEEK", tDAY_UNIT, 7 },
|
|---|
| 510 | { "DAY", tDAY_UNIT, 1 },
|
|---|
| 511 | { "HOUR", tHOUR_UNIT, 1 },
|
|---|
| 512 | { "MINUTE", tMINUTE_UNIT, 1 },
|
|---|
| 513 | { "MIN", tMINUTE_UNIT, 1 },
|
|---|
| 514 | { "SECOND", tSEC_UNIT, 1 },
|
|---|
| 515 | { "SEC", tSEC_UNIT, 1 },
|
|---|
| 516 | { 0, 0, 0 }
|
|---|
| 517 | };
|
|---|
| 518 |
|
|---|
| 519 | /* Assorted relative-time words. */
|
|---|
| 520 | static table const relative_time_table[] =
|
|---|
| 521 | {
|
|---|
| 522 | { "TOMORROW", tMINUTE_UNIT, 24 * 60 },
|
|---|
| 523 | { "YESTERDAY",tMINUTE_UNIT, - (24 * 60) },
|
|---|
| 524 | { "TODAY", tMINUTE_UNIT, 0 },
|
|---|
| 525 | { "NOW", tMINUTE_UNIT, 0 },
|
|---|
| 526 | { "LAST", tUNUMBER, -1 },
|
|---|
| 527 | { "THIS", tUNUMBER, 0 },
|
|---|
| 528 | { "NEXT", tUNUMBER, 1 },
|
|---|
| 529 | { "FIRST", tUNUMBER, 1 },
|
|---|
| 530 | /*{ "SECOND", tUNUMBER, 2 }, */
|
|---|
| 531 | { "THIRD", tUNUMBER, 3 },
|
|---|
| 532 | { "FOURTH", tUNUMBER, 4 },
|
|---|
| 533 | { "FIFTH", tUNUMBER, 5 },
|
|---|
| 534 | { "SIXTH", tUNUMBER, 6 },
|
|---|
| 535 | { "SEVENTH", tUNUMBER, 7 },
|
|---|
| 536 | { "EIGHTH", tUNUMBER, 8 },
|
|---|
| 537 | { "NINTH", tUNUMBER, 9 },
|
|---|
| 538 | { "TENTH", tUNUMBER, 10 },
|
|---|
| 539 | { "ELEVENTH", tUNUMBER, 11 },
|
|---|
| 540 | { "TWELFTH", tUNUMBER, 12 },
|
|---|
| 541 | { "AGO", tAGO, 1 },
|
|---|
| 542 | { 0, 0, 0 }
|
|---|
| 543 | };
|
|---|
| 544 |
|
|---|
| 545 | /* The time zone table. This table is necessarily incomplete, as time
|
|---|
| 546 | zone abbreviations are ambiguous; e.g. Australians interpret "EST"
|
|---|
| 547 | as Eastern time in Australia, not as US Eastern Standard Time.
|
|---|
| 548 | You cannot rely on getdate to handle arbitrary time zone
|
|---|
| 549 | abbreviations; use numeric abbreviations like `-0500' instead. */
|
|---|
| 550 | static table const time_zone_table[] =
|
|---|
| 551 | {
|
|---|
| 552 | { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */
|
|---|
| 553 | { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
|
|---|
| 554 | { "UTC", tZONE, HOUR ( 0) },
|
|---|
| 555 | { "WET", tZONE, HOUR ( 0) }, /* Western European */
|
|---|
| 556 | { "WEST", tDAYZONE, HOUR ( 0) }, /* Western European Summer */
|
|---|
| 557 | { "BST", tDAYZONE, HOUR ( 0) }, /* British Summer */
|
|---|
| 558 | { "ART", tZONE, -HOUR ( 3) }, /* Argentina */
|
|---|
| 559 | { "BRT", tZONE, -HOUR ( 3) }, /* Brazil */
|
|---|
| 560 | { "BRST", tDAYZONE, -HOUR ( 3) }, /* Brazil Summer */
|
|---|
| 561 | { "NST", tZONE, -(HOUR ( 3) + 30) }, /* Newfoundland Standard */
|
|---|
| 562 | { "NDT", tDAYZONE,-(HOUR ( 3) + 30) }, /* Newfoundland Daylight */
|
|---|
| 563 | { "AST", tZONE, -HOUR ( 4) }, /* Atlantic Standard */
|
|---|
| 564 | { "ADT", tDAYZONE, -HOUR ( 4) }, /* Atlantic Daylight */
|
|---|
| 565 | { "CLT", tZONE, -HOUR ( 4) }, /* Chile */
|
|---|
| 566 | { "CLST", tDAYZONE, -HOUR ( 4) }, /* Chile Summer */
|
|---|
| 567 | { "EST", tZONE, -HOUR ( 5) }, /* Eastern Standard */
|
|---|
| 568 | { "EDT", tDAYZONE, -HOUR ( 5) }, /* Eastern Daylight */
|
|---|
| 569 | { "CST", tZONE, -HOUR ( 6) }, /* Central Standard */
|
|---|
| 570 | { "CDT", tDAYZONE, -HOUR ( 6) }, /* Central Daylight */
|
|---|
| 571 | { "MST", tZONE, -HOUR ( 7) }, /* Mountain Standard */
|
|---|
| 572 | { "MDT", tDAYZONE, -HOUR ( 7) }, /* Mountain Daylight */
|
|---|
| 573 | { "PST", tZONE, -HOUR ( 8) }, /* Pacific Standard */
|
|---|
| 574 | { "PDT", tDAYZONE, -HOUR ( 8) }, /* Pacific Daylight */
|
|---|
| 575 | { "AKST", tZONE, -HOUR ( 9) }, /* Alaska Standard */
|
|---|
| 576 | { "AKDT", tDAYZONE, -HOUR ( 9) }, /* Alaska Daylight */
|
|---|
| 577 | { "HST", tZONE, -HOUR (10) }, /* Hawaii Standard */
|
|---|
| 578 | { "HAST", tZONE, -HOUR (10) }, /* Hawaii-Aleutian Standard */
|
|---|
| 579 | { "HADT", tDAYZONE, -HOUR (10) }, /* Hawaii-Aleutian Daylight */
|
|---|
| 580 | { "SST", tZONE, -HOUR (12) }, /* Samoa Standard */
|
|---|
| 581 | { "WAT", tZONE, HOUR ( 1) }, /* West Africa */
|
|---|
| 582 | { "CET", tZONE, HOUR ( 1) }, /* Central European */
|
|---|
| 583 | { "CEST", tDAYZONE, HOUR ( 1) }, /* Central European Summer */
|
|---|
| 584 | { "MET", tZONE, HOUR ( 1) }, /* Middle European */
|
|---|
| 585 | { "MEZ", tZONE, HOUR ( 1) }, /* Middle European */
|
|---|
| 586 | { "MEST", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */
|
|---|
| 587 | { "MESZ", tDAYZONE, HOUR ( 1) }, /* Middle European Summer */
|
|---|
| 588 | { "EET", tZONE, HOUR ( 2) }, /* Eastern European */
|
|---|
| 589 | { "EEST", tDAYZONE, HOUR ( 2) }, /* Eastern European Summer */
|
|---|
| 590 | { "CAT", tZONE, HOUR ( 2) }, /* Central Africa */
|
|---|
| 591 | { "SAST", tZONE, HOUR ( 2) }, /* South Africa Standard */
|
|---|
| 592 | { "EAT", tZONE, HOUR ( 3) }, /* East Africa */
|
|---|
| 593 | { "MSK", tZONE, HOUR ( 3) }, /* Moscow */
|
|---|
| 594 | { "MSD", tDAYZONE, HOUR ( 3) }, /* Moscow Daylight */
|
|---|
| 595 | { "IST", tZONE, (HOUR ( 5) + 30) }, /* India Standard */
|
|---|
| 596 | { "SGT", tZONE, HOUR ( 8) }, /* Singapore */
|
|---|
| 597 | { "KST", tZONE, HOUR ( 9) }, /* Korea Standard */
|
|---|
| 598 | { "JST", tZONE, HOUR ( 9) }, /* Japan Standard */
|
|---|
| 599 | { "GST", tZONE, HOUR (10) }, /* Guam Standard */
|
|---|
| 600 | { "NZST", tZONE, HOUR (12) }, /* New Zealand Standard */
|
|---|
| 601 | { "NZDT", tDAYZONE, HOUR (12) }, /* New Zealand Daylight */
|
|---|
| 602 | { 0, 0, 0 }
|
|---|
| 603 | };
|
|---|
| 604 |
|
|---|
| 605 | /* Military time zone table. */
|
|---|
| 606 | static table const military_table[] =
|
|---|
| 607 | {
|
|---|
| 608 | { "A", tZONE, -HOUR ( 1) },
|
|---|
| 609 | { "B", tZONE, -HOUR ( 2) },
|
|---|
| 610 | { "C", tZONE, -HOUR ( 3) },
|
|---|
| 611 | { "D", tZONE, -HOUR ( 4) },
|
|---|
| 612 | { "E", tZONE, -HOUR ( 5) },
|
|---|
| 613 | { "F", tZONE, -HOUR ( 6) },
|
|---|
| 614 | { "G", tZONE, -HOUR ( 7) },
|
|---|
| 615 | { "H", tZONE, -HOUR ( 8) },
|
|---|
| 616 | { "I", tZONE, -HOUR ( 9) },
|
|---|
| 617 | { "K", tZONE, -HOUR (10) },
|
|---|
| 618 | { "L", tZONE, -HOUR (11) },
|
|---|
| 619 | { "M", tZONE, -HOUR (12) },
|
|---|
| 620 | { "N", tZONE, HOUR ( 1) },
|
|---|
| 621 | { "O", tZONE, HOUR ( 2) },
|
|---|
| 622 | { "P", tZONE, HOUR ( 3) },
|
|---|
| 623 | { "Q", tZONE, HOUR ( 4) },
|
|---|
| 624 | { "R", tZONE, HOUR ( 5) },
|
|---|
| 625 | { "S", tZONE, HOUR ( 6) },
|
|---|
| 626 | { "T", tZONE, HOUR ( 7) },
|
|---|
| 627 | { "U", tZONE, HOUR ( 8) },
|
|---|
| 628 | { "V", tZONE, HOUR ( 9) },
|
|---|
| 629 | { "W", tZONE, HOUR (10) },
|
|---|
| 630 | { "X", tZONE, HOUR (11) },
|
|---|
| 631 | { "Y", tZONE, HOUR (12) },
|
|---|
| 632 | { "Z", tZONE, HOUR ( 0) },
|
|---|
| 633 | { 0, 0, 0 }
|
|---|
| 634 | };
|
|---|
| 635 |
|
|---|
| 636 | |
|---|
| 637 |
|
|---|
| 638 |
|
|---|
| 639 | static int
|
|---|
| 640 | to_hour (int hours, int meridian)
|
|---|
| 641 | {
|
|---|
| 642 | switch (meridian)
|
|---|
| 643 | {
|
|---|
| 644 | case MER24:
|
|---|
| 645 | return 0 <= hours && hours < 24 ? hours : -1;
|
|---|
| 646 | case MERam:
|
|---|
| 647 | return 0 < hours && hours < 12 ? hours : hours == 12 ? 0 : -1;
|
|---|
| 648 | case MERpm:
|
|---|
| 649 | return 0 < hours && hours < 12 ? hours + 12 : hours == 12 ? 12 : -1;
|
|---|
| 650 | default:
|
|---|
| 651 | abort ();
|
|---|
| 652 | }
|
|---|
| 653 | /* NOTREACHED */
|
|---|
| 654 | return 0;
|
|---|
| 655 | }
|
|---|
| 656 |
|
|---|
| 657 | static int
|
|---|
| 658 | to_year (textint textyear)
|
|---|
| 659 | {
|
|---|
| 660 | int year = textyear.value;
|
|---|
| 661 |
|
|---|
| 662 | if (year < 0)
|
|---|
| 663 | year = -year;
|
|---|
| 664 |
|
|---|
| 665 | /* XPG4 suggests that years 00-68 map to 2000-2068, and
|
|---|
| 666 | years 69-99 map to 1969-1999. */
|
|---|
| 667 | if (textyear.digits == 2)
|
|---|
| 668 | year += year < 69 ? 2000 : 1900;
|
|---|
| 669 |
|
|---|
| 670 | return year;
|
|---|
| 671 | }
|
|---|
| 672 |
|
|---|
| 673 | static table const *
|
|---|
| 674 | lookup_zone (parser_control const *pc, char const *name)
|
|---|
| 675 | {
|
|---|
| 676 | table const *tp;
|
|---|
| 677 |
|
|---|
| 678 | /* Try local zone abbreviations first; they're more likely to be right. */
|
|---|
| 679 | for (tp = pc->local_time_zone_table; tp->name; tp++)
|
|---|
| 680 | if (strcmp (name, tp->name) == 0)
|
|---|
| 681 | return tp;
|
|---|
| 682 |
|
|---|
| 683 | for (tp = time_zone_table; tp->name; tp++)
|
|---|
| 684 | if (strcmp (name, tp->name) == 0)
|
|---|
| 685 | return tp;
|
|---|
| 686 |
|
|---|
| 687 | return 0;
|
|---|
| 688 | }
|
|---|
| 689 |
|
|---|
| 690 | #if ! HAVE_TM_GMTOFF
|
|---|
| 691 | /* Yield the difference between *A and *B,
|
|---|
| 692 | measured in seconds, ignoring leap seconds.
|
|---|
| 693 | The body of this function is taken directly from the GNU C Library;
|
|---|
| 694 | see src/strftime.c. */
|
|---|
| 695 | static int
|
|---|
| 696 | tm_diff (struct tm const *a, struct tm const *b)
|
|---|
| 697 | {
|
|---|
| 698 | /* Compute intervening leap days correctly even if year is negative.
|
|---|
| 699 | Take care to avoid int overflow in leap day calculations,
|
|---|
| 700 | but it's OK to assume that A and B are close to each other. */
|
|---|
| 701 | int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
|
|---|
| 702 | int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
|
|---|
| 703 | int a100 = a4 / 25 - (a4 % 25 < 0);
|
|---|
| 704 | int b100 = b4 / 25 - (b4 % 25 < 0);
|
|---|
| 705 | int a400 = a100 >> 2;
|
|---|
| 706 | int b400 = b100 >> 2;
|
|---|
| 707 | int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
|
|---|
| 708 | int years = a->tm_year - b->tm_year;
|
|---|
| 709 | int days = (365 * years + intervening_leap_days
|
|---|
| 710 | + (a->tm_yday - b->tm_yday));
|
|---|
| 711 | return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
|
|---|
| 712 | + (a->tm_min - b->tm_min))
|
|---|
| 713 | + (a->tm_sec - b->tm_sec));
|
|---|
| 714 | }
|
|---|
| 715 | #endif /* ! HAVE_TM_GMTOFF */
|
|---|
| 716 |
|
|---|
| 717 | static table const *
|
|---|
| 718 | lookup_word (parser_control const *pc, char *word)
|
|---|
| 719 | {
|
|---|
| 720 | char *p;
|
|---|
| 721 | char *q;
|
|---|
| 722 | size_t wordlen;
|
|---|
| 723 | table const *tp;
|
|---|
| 724 | int i;
|
|---|
| 725 | int abbrev;
|
|---|
| 726 |
|
|---|
| 727 | /* Make it uppercase. */
|
|---|
| 728 | for (p = word; *p; p++)
|
|---|
| 729 | if (ISLOWER ((unsigned char) *p))
|
|---|
| 730 | *p = toupper ((unsigned char) *p);
|
|---|
| 731 |
|
|---|
| 732 | for (tp = meridian_table; tp->name; tp++)
|
|---|
| 733 | if (strcmp (word, tp->name) == 0)
|
|---|
| 734 | return tp;
|
|---|
| 735 |
|
|---|
| 736 | /* See if we have an abbreviation for a month. */
|
|---|
| 737 | wordlen = strlen (word);
|
|---|
| 738 | abbrev = wordlen == 3 || (wordlen == 4 && word[3] == '.');
|
|---|
| 739 |
|
|---|
| 740 | for (tp = month_and_day_table; tp->name; tp++)
|
|---|
| 741 | if ((abbrev ? strncmp (word, tp->name, 3) : strcmp (word, tp->name)) == 0)
|
|---|
| 742 | return tp;
|
|---|
| 743 |
|
|---|
| 744 | if ((tp = lookup_zone (pc, word)))
|
|---|
| 745 | return tp;
|
|---|
| 746 |
|
|---|
| 747 | if (strcmp (word, dst_table[0].name) == 0)
|
|---|
| 748 | return dst_table;
|
|---|
| 749 |
|
|---|
| 750 | for (tp = time_units_table; tp->name; tp++)
|
|---|
| 751 | if (strcmp (word, tp->name) == 0)
|
|---|
| 752 | return tp;
|
|---|
| 753 |
|
|---|
| 754 | /* Strip off any plural and try the units table again. */
|
|---|
| 755 | if (word[wordlen - 1] == 'S')
|
|---|
| 756 | {
|
|---|
| 757 | word[wordlen - 1] = '\0';
|
|---|
| 758 | for (tp = time_units_table; tp->name; tp++)
|
|---|
| 759 | if (strcmp (word, tp->name) == 0)
|
|---|
| 760 | return tp;
|
|---|
| 761 | word[wordlen - 1] = 'S'; /* For "this" in relative_time_table. */
|
|---|
| 762 | }
|
|---|
| 763 |
|
|---|
| 764 | for (tp = relative_time_table; tp->name; tp++)
|
|---|
| 765 | if (strcmp (word, tp->name) == 0)
|
|---|
| 766 | return tp;
|
|---|
| 767 |
|
|---|
| 768 | /* Military time zones. */
|
|---|
| 769 | if (wordlen == 1)
|
|---|
| 770 | for (tp = military_table; tp->name; tp++)
|
|---|
| 771 | if (word[0] == tp->name[0])
|
|---|
| 772 | return tp;
|
|---|
| 773 |
|
|---|
| 774 | /* Drop out any periods and try the time zone table again. */
|
|---|
| 775 | for (i = 0, p = q = word; (*p = *q); q++)
|
|---|
| 776 | if (*q == '.')
|
|---|
| 777 | i = 1;
|
|---|
| 778 | else
|
|---|
| 779 | p++;
|
|---|
| 780 | if (i && (tp = lookup_zone (pc, word)))
|
|---|
| 781 | return tp;
|
|---|
| 782 |
|
|---|
| 783 | return 0;
|
|---|
| 784 | }
|
|---|
| 785 |
|
|---|
| 786 | static int
|
|---|
| 787 | yylex (YYSTYPE *lvalp, parser_control *pc)
|
|---|
| 788 | {
|
|---|
| 789 | unsigned char c;
|
|---|
| 790 | int count;
|
|---|
| 791 |
|
|---|
| 792 | for (;;)
|
|---|
| 793 | {
|
|---|
| 794 | while (c = *pc->input, ISSPACE (c))
|
|---|
| 795 | pc->input++;
|
|---|
| 796 |
|
|---|
| 797 | if (ISDIGIT (c) || c == '-' || c == '+')
|
|---|
| 798 | {
|
|---|
| 799 | char const *p;
|
|---|
| 800 | int sign;
|
|---|
| 801 | int value;
|
|---|
| 802 | if (c == '-' || c == '+')
|
|---|
| 803 | {
|
|---|
| 804 | sign = c == '-' ? -1 : 1;
|
|---|
| 805 | c = *++pc->input;
|
|---|
| 806 | if (! ISDIGIT (c))
|
|---|
| 807 | /* skip the '-' sign */
|
|---|
| 808 | continue;
|
|---|
| 809 | }
|
|---|
| 810 | else
|
|---|
| 811 | sign = 0;
|
|---|
| 812 | p = pc->input;
|
|---|
| 813 | value = 0;
|
|---|
| 814 | do
|
|---|
| 815 | {
|
|---|
| 816 | value = 10 * value + c - '0';
|
|---|
| 817 | c = *++p;
|
|---|
| 818 | }
|
|---|
| 819 | while (ISDIGIT (c));
|
|---|
| 820 | lvalp->textintval.value = sign < 0 ? -value : value;
|
|---|
| 821 | lvalp->textintval.digits = p - pc->input;
|
|---|
| 822 | pc->input = p;
|
|---|
| 823 | return sign ? tSNUMBER : tUNUMBER;
|
|---|
| 824 | }
|
|---|
| 825 |
|
|---|
| 826 | if (ISALPHA (c))
|
|---|
| 827 | {
|
|---|
| 828 | char buff[20];
|
|---|
| 829 | char *p = buff;
|
|---|
| 830 | table const *tp;
|
|---|
| 831 |
|
|---|
| 832 | do
|
|---|
| 833 | {
|
|---|
| 834 | if (p < buff + sizeof buff - 1)
|
|---|
| 835 | *p++ = c;
|
|---|
| 836 | c = *++pc->input;
|
|---|
| 837 | }
|
|---|
| 838 | while (ISALPHA (c) || c == '.');
|
|---|
| 839 |
|
|---|
| 840 | *p = '\0';
|
|---|
| 841 | tp = lookup_word (pc, buff);
|
|---|
| 842 | if (! tp)
|
|---|
| 843 | return '?';
|
|---|
| 844 | lvalp->intval = tp->value;
|
|---|
| 845 | return tp->type;
|
|---|
| 846 | }
|
|---|
| 847 |
|
|---|
| 848 | if (c != '(')
|
|---|
| 849 | return *pc->input++;
|
|---|
| 850 | count = 0;
|
|---|
| 851 | do
|
|---|
| 852 | {
|
|---|
| 853 | c = *pc->input++;
|
|---|
| 854 | if (c == '\0')
|
|---|
| 855 | return c;
|
|---|
| 856 | if (c == '(')
|
|---|
| 857 | count++;
|
|---|
| 858 | else if (c == ')')
|
|---|
| 859 | count--;
|
|---|
| 860 | }
|
|---|
| 861 | while (count > 0);
|
|---|
| 862 | }
|
|---|
| 863 | }
|
|---|
| 864 |
|
|---|
| 865 | /* Do nothing if the parser reports an error. */
|
|---|
| 866 | static int
|
|---|
| 867 | yyerror (char *s ATTRIBUTE_UNUSED)
|
|---|
| 868 | {
|
|---|
| 869 | return 0;
|
|---|
| 870 | }
|
|---|
| 871 |
|
|---|
| 872 | /* Parse a date/time string P. Return the corresponding time_t value,
|
|---|
| 873 | or (time_t) -1 if there is an error. P can be an incomplete or
|
|---|
| 874 | relative time specification; if so, use *NOW as the basis for the
|
|---|
| 875 | returned time. */
|
|---|
| 876 | time_t
|
|---|
| 877 | get_date (const char *p, const time_t *now)
|
|---|
| 878 | {
|
|---|
| 879 | time_t Start = now ? *now : time (0);
|
|---|
| 880 | struct tm *tmp = localtime (&Start);
|
|---|
| 881 | struct tm tm;
|
|---|
| 882 | struct tm tm0;
|
|---|
| 883 | parser_control pc;
|
|---|
| 884 |
|
|---|
| 885 | if (! tmp)
|
|---|
| 886 | return -1;
|
|---|
| 887 |
|
|---|
| 888 | pc.input = p;
|
|---|
| 889 | pc.year.value = tmp->tm_year + TM_YEAR_BASE;
|
|---|
| 890 | pc.year.digits = 4;
|
|---|
| 891 | pc.month = tmp->tm_mon + 1;
|
|---|
| 892 | pc.day = tmp->tm_mday;
|
|---|
| 893 | pc.hour = tmp->tm_hour;
|
|---|
| 894 | pc.minutes = tmp->tm_min;
|
|---|
| 895 | pc.seconds = tmp->tm_sec;
|
|---|
| 896 | tm.tm_isdst = tmp->tm_isdst;
|
|---|
| 897 |
|
|---|
| 898 | pc.meridian = MER24;
|
|---|
| 899 | pc.rel_seconds = 0;
|
|---|
| 900 | pc.rel_minutes = 0;
|
|---|
| 901 | pc.rel_hour = 0;
|
|---|
| 902 | pc.rel_day = 0;
|
|---|
| 903 | pc.rel_month = 0;
|
|---|
| 904 | pc.rel_year = 0;
|
|---|
| 905 | pc.dates_seen = 0;
|
|---|
| 906 | pc.days_seen = 0;
|
|---|
| 907 | pc.rels_seen = 0;
|
|---|
| 908 | pc.times_seen = 0;
|
|---|
| 909 | pc.local_zones_seen = 0;
|
|---|
| 910 | pc.zones_seen = 0;
|
|---|
| 911 |
|
|---|
| 912 | #if HAVE_STRUCT_TM_TM_ZONE
|
|---|
| 913 | pc.local_time_zone_table[0].name = tmp->tm_zone;
|
|---|
| 914 | pc.local_time_zone_table[0].type = tLOCAL_ZONE;
|
|---|
| 915 | pc.local_time_zone_table[0].value = tmp->tm_isdst;
|
|---|
| 916 | pc.local_time_zone_table[1].name = 0;
|
|---|
| 917 |
|
|---|
| 918 | /* Probe the names used in the next three calendar quarters, looking
|
|---|
| 919 | for a tm_isdst different from the one we already have. */
|
|---|
| 920 | {
|
|---|
| 921 | int quarter;
|
|---|
| 922 | for (quarter = 1; quarter <= 3; quarter++)
|
|---|
| 923 | {
|
|---|
| 924 | time_t probe = Start + quarter * (90 * 24 * 60 * 60);
|
|---|
| 925 | struct tm *probe_tm = localtime (&probe);
|
|---|
| 926 | if (probe_tm && probe_tm->tm_zone
|
|---|
| 927 | && probe_tm->tm_isdst != pc.local_time_zone_table[0].value)
|
|---|
| 928 | {
|
|---|
| 929 | {
|
|---|
| 930 | pc.local_time_zone_table[1].name = probe_tm->tm_zone;
|
|---|
| 931 | pc.local_time_zone_table[1].type = tLOCAL_ZONE;
|
|---|
| 932 | pc.local_time_zone_table[1].value = probe_tm->tm_isdst;
|
|---|
| 933 | pc.local_time_zone_table[2].name = 0;
|
|---|
| 934 | }
|
|---|
| 935 | break;
|
|---|
| 936 | }
|
|---|
| 937 | }
|
|---|
| 938 | }
|
|---|
| 939 | #else
|
|---|
| 940 | #if HAVE_TZNAME
|
|---|
| 941 | {
|
|---|
| 942 | # ifndef tzname
|
|---|
| 943 | extern char *tzname[];
|
|---|
| 944 | # endif
|
|---|
| 945 | int i;
|
|---|
| 946 | for (i = 0; i < 2; i++)
|
|---|
| 947 | {
|
|---|
| 948 | pc.local_time_zone_table[i].name = tzname[i];
|
|---|
| 949 | pc.local_time_zone_table[i].type = tLOCAL_ZONE;
|
|---|
| 950 | pc.local_time_zone_table[i].value = i;
|
|---|
| 951 | }
|
|---|
| 952 | pc.local_time_zone_table[i].name = 0;
|
|---|
| 953 | }
|
|---|
| 954 | #else
|
|---|
| 955 | pc.local_time_zone_table[0].name = 0;
|
|---|
| 956 | #endif
|
|---|
| 957 | #endif
|
|---|
| 958 |
|
|---|
| 959 | if (pc.local_time_zone_table[0].name && pc.local_time_zone_table[1].name
|
|---|
| 960 | && ! strcmp (pc.local_time_zone_table[0].name,
|
|---|
| 961 | pc.local_time_zone_table[1].name))
|
|---|
| 962 | {
|
|---|
| 963 | /* This locale uses the same abbrevation for standard and
|
|---|
| 964 | daylight times. So if we see that abbreviation, we don't
|
|---|
| 965 | know whether it's daylight time. */
|
|---|
| 966 | pc.local_time_zone_table[0].value = -1;
|
|---|
| 967 | pc.local_time_zone_table[1].name = 0;
|
|---|
| 968 | }
|
|---|
| 969 |
|
|---|
| 970 | if (yyparse (&pc) != 0
|
|---|
| 971 | || 1 < pc.times_seen || 1 < pc.dates_seen || 1 < pc.days_seen
|
|---|
| 972 | || 1 < (pc.local_zones_seen + pc.zones_seen)
|
|---|
| 973 | || (pc.local_zones_seen && 1 < pc.local_isdst))
|
|---|
| 974 | return -1;
|
|---|
| 975 |
|
|---|
| 976 | tm.tm_year = to_year (pc.year) - TM_YEAR_BASE + pc.rel_year;
|
|---|
| 977 | tm.tm_mon = pc.month - 1 + pc.rel_month;
|
|---|
| 978 | tm.tm_mday = pc.day + pc.rel_day;
|
|---|
| 979 | if (pc.times_seen || (pc.rels_seen && ! pc.dates_seen && ! pc.days_seen))
|
|---|
| 980 | {
|
|---|
| 981 | tm.tm_hour = to_hour (pc.hour, pc.meridian);
|
|---|
| 982 | if (tm.tm_hour < 0)
|
|---|
| 983 | return -1;
|
|---|
| 984 | tm.tm_min = pc.minutes;
|
|---|
| 985 | tm.tm_sec = pc.seconds;
|
|---|
| 986 | }
|
|---|
| 987 | else
|
|---|
| 988 | {
|
|---|
| 989 | tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
|
|---|
| 990 | }
|
|---|
| 991 |
|
|---|
| 992 | /* Let mktime deduce tm_isdst if we have an absolute time stamp,
|
|---|
| 993 | or if the relative time stamp mentions days, months, or years. */
|
|---|
| 994 | if (pc.dates_seen | pc.days_seen | pc.times_seen | pc.rel_day
|
|---|
| 995 | | pc.rel_month | pc.rel_year)
|
|---|
| 996 | tm.tm_isdst = -1;
|
|---|
| 997 |
|
|---|
| 998 | /* But if the input explicitly specifies local time with or without
|
|---|
| 999 | DST, give mktime that information. */
|
|---|
| 1000 | if (pc.local_zones_seen)
|
|---|
| 1001 | tm.tm_isdst = pc.local_isdst;
|
|---|
| 1002 |
|
|---|
| 1003 | tm0 = tm;
|
|---|
| 1004 |
|
|---|
| 1005 | Start = mktime (&tm);
|
|---|
| 1006 |
|
|---|
| 1007 | if (Start == (time_t) -1)
|
|---|
| 1008 | {
|
|---|
| 1009 |
|
|---|
| 1010 | /* Guard against falsely reporting errors near the time_t boundaries
|
|---|
| 1011 | when parsing times in other time zones. For example, if the min
|
|---|
| 1012 | time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead
|
|---|
| 1013 | of UTC, then the min localtime value is 1970-01-01 08:00:00; if
|
|---|
| 1014 | we apply mktime to 1970-01-01 00:00:00 we will get an error, so
|
|---|
| 1015 | we apply mktime to 1970-01-02 08:00:00 instead and adjust the time
|
|---|
| 1016 | zone by 24 hours to compensate. This algorithm assumes that
|
|---|
| 1017 | there is no DST transition within a day of the time_t boundaries. */
|
|---|
| 1018 | if (pc.zones_seen)
|
|---|
| 1019 | {
|
|---|
| 1020 | tm = tm0;
|
|---|
| 1021 | if (tm.tm_year <= EPOCH_YEAR - TM_YEAR_BASE)
|
|---|
| 1022 | {
|
|---|
| 1023 | tm.tm_mday++;
|
|---|
| 1024 | pc.time_zone += 24 * 60;
|
|---|
| 1025 | }
|
|---|
| 1026 | else
|
|---|
| 1027 | {
|
|---|
| 1028 | tm.tm_mday--;
|
|---|
| 1029 | pc.time_zone -= 24 * 60;
|
|---|
| 1030 | }
|
|---|
| 1031 | Start = mktime (&tm);
|
|---|
| 1032 | }
|
|---|
| 1033 |
|
|---|
| 1034 | if (Start == (time_t) -1)
|
|---|
| 1035 | return Start;
|
|---|
| 1036 | }
|
|---|
| 1037 |
|
|---|
| 1038 | if (pc.days_seen && ! pc.dates_seen)
|
|---|
| 1039 | {
|
|---|
| 1040 | tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7
|
|---|
| 1041 | + 7 * (pc.day_ordinal - (0 < pc.day_ordinal)));
|
|---|
| 1042 | tm.tm_isdst = -1;
|
|---|
| 1043 | Start = mktime (&tm);
|
|---|
| 1044 | if (Start == (time_t) -1)
|
|---|
| 1045 | return Start;
|
|---|
| 1046 | }
|
|---|
| 1047 |
|
|---|
| 1048 | if (pc.zones_seen)
|
|---|
| 1049 | {
|
|---|
| 1050 | int delta = pc.time_zone * 60;
|
|---|
| 1051 | #ifdef HAVE_TM_GMTOFF
|
|---|
| 1052 | delta -= tm.tm_gmtoff;
|
|---|
| 1053 | #else
|
|---|
| 1054 | struct tm *gmt = gmtime (&Start);
|
|---|
| 1055 | if (! gmt)
|
|---|
| 1056 | return -1;
|
|---|
| 1057 | delta -= tm_diff (&tm, gmt);
|
|---|
| 1058 | #endif
|
|---|
| 1059 | if ((Start < Start - delta) != (delta < 0))
|
|---|
| 1060 | return -1; /* time_t overflow */
|
|---|
| 1061 | Start -= delta;
|
|---|
| 1062 | }
|
|---|
| 1063 |
|
|---|
| 1064 | /* Add relative hours, minutes, and seconds. Ignore leap seconds;
|
|---|
| 1065 | i.e. "+ 10 minutes" means 600 seconds, even if one of them is a
|
|---|
| 1066 | leap second. Typically this is not what the user wants, but it's
|
|---|
| 1067 | too hard to do it the other way, because the time zone indicator
|
|---|
| 1068 | must be applied before relative times, and if mktime is applied
|
|---|
| 1069 | again the time zone will be lost. */
|
|---|
| 1070 | {
|
|---|
| 1071 | time_t t0 = Start;
|
|---|
| 1072 | long d1 = 60 * 60 * (long) pc.rel_hour;
|
|---|
| 1073 | time_t t1 = t0 + d1;
|
|---|
| 1074 | long d2 = 60 * (long) pc.rel_minutes;
|
|---|
| 1075 | time_t t2 = t1 + d2;
|
|---|
| 1076 | int d3 = pc.rel_seconds;
|
|---|
| 1077 | time_t t3 = t2 + d3;
|
|---|
| 1078 | if ((d1 / (60 * 60) ^ pc.rel_hour)
|
|---|
| 1079 | | (d2 / 60 ^ pc.rel_minutes)
|
|---|
| 1080 | | ((t0 + d1 < t0) ^ (d1 < 0))
|
|---|
| 1081 | | ((t1 + d2 < t1) ^ (d2 < 0))
|
|---|
| 1082 | | ((t2 + d3 < t2) ^ (d3 < 0)))
|
|---|
| 1083 | return -1;
|
|---|
| 1084 | Start = t3;
|
|---|
| 1085 | }
|
|---|
| 1086 |
|
|---|
| 1087 | return Start;
|
|---|
| 1088 | }
|
|---|
| 1089 |
|
|---|
| 1090 | #if TEST
|
|---|
| 1091 |
|
|---|
| 1092 | #include <stdio.h>
|
|---|
| 1093 |
|
|---|
| 1094 | int
|
|---|
| 1095 | main (int ac, char **av)
|
|---|
| 1096 | {
|
|---|
| 1097 | char buff[BUFSIZ];
|
|---|
| 1098 | time_t d;
|
|---|
| 1099 |
|
|---|
| 1100 | printf ("Enter date, or blank line to exit.\n\t> ");
|
|---|
| 1101 | fflush (stdout);
|
|---|
| 1102 |
|
|---|
| 1103 | buff[BUFSIZ - 1] = 0;
|
|---|
| 1104 | while (fgets (buff, BUFSIZ - 1, stdin) && buff[0])
|
|---|
| 1105 | {
|
|---|
| 1106 | d = get_date (buff, 0);
|
|---|
| 1107 | if (d == (time_t) -1)
|
|---|
| 1108 | printf ("Bad format - couldn't convert.\n");
|
|---|
| 1109 | else
|
|---|
| 1110 | printf ("%s", ctime (&d));
|
|---|
| 1111 | printf ("\t> ");
|
|---|
| 1112 | fflush (stdout);
|
|---|
| 1113 | }
|
|---|
| 1114 | return 0;
|
|---|
| 1115 | }
|
|---|
| 1116 | #endif /* defined TEST */
|
|---|
