654 lines
14 KiB
C
654 lines
14 KiB
C
/* $NetBSD: parsetime.c,v 1.14 2006/01/03 00:15:45 garbled Exp $ */
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/*
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* parsetime.c - parse time for at(1)
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* Copyright (C) 1993, 1994 Thomas Koenig
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*
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* modifications for english-language times
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* Copyright (C) 1993 David Parsons
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* at [NOW] PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS
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* /NUMBER [DOT NUMBER] [AM|PM]\ /[MONTH NUMBER [NUMBER]] \
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* |NOON | |[TOMORROW] |
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* |MIDNIGHT | |[DAY OF WEEK] |
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* \TEATIME / |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
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* \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
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*/
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/* System Headers */
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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/* Local headers */
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#include "at.h"
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#include "panic.h"
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#include "parsetime.h"
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/* Structures and unions */
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enum { /* symbols */
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MIDNIGHT, NOON, TEATIME,
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PM, AM, TOMORROW, TODAY, NOW,
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MINUTES, HOURS, DAYS, WEEKS,
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NUMBER, PLUS, DOT, SLASH, ID, JUNK,
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JAN, FEB, MAR, APR, MAY, JUN,
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JUL, AUG, SEP, OCT, NOV, DEC,
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SUN, MON, TUE, WED, THU, FRI, SAT
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};
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/*
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* parse translation table - table driven parsers can be your FRIEND!
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*/
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struct {
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char *name; /* token name */
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int value; /* token id */
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int plural; /* is this plural? */
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} Specials[] = {
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{ "midnight", MIDNIGHT, 0 }, /* 00:00:00 of today or tomorrow */
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{ "noon", NOON, 0 }, /* 12:00:00 of today or tomorrow */
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{ "teatime", TEATIME, 0 }, /* 16:00:00 of today or tomorrow */
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{ "am", AM, 0 }, /* morning times for 0-12 clock */
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{ "pm", PM, 0 }, /* evening times for 0-12 clock */
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{ "tomorrow", TOMORROW, 0 }, /* execute 24 hours from time */
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{ "today", TODAY, 0 }, /* execute today - don't advance time */
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{ "now", NOW, 0 }, /* opt prefix for PLUS */
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{ "minute", MINUTES, 0 }, /* minutes multiplier */
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{ "min", MINUTES, 0 },
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{ "m", MINUTES, 0 },
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{ "minutes", MINUTES, 1 }, /* (pluralized) */
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{ "hour", HOURS, 0 }, /* hours ... */
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{ "hr", HOURS, 0 }, /* abbreviated */
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{ "h", HOURS, 0 },
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{ "hours", HOURS, 1 }, /* (pluralized) */
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{ "day", DAYS, 0 }, /* days ... */
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{ "d", DAYS, 0 },
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{ "days", DAYS, 1 }, /* (pluralized) */
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{ "week", WEEKS, 0 }, /* week ... */
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{ "w", WEEKS, 0 },
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{ "weeks", WEEKS, 1 }, /* (pluralized) */
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{ "jan", JAN, 0 },
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{ "feb", FEB, 0 },
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{ "mar", MAR, 0 },
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{ "apr", APR, 0 },
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{ "may", MAY, 0 },
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{ "jun", JUN, 0 },
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{ "jul", JUL, 0 },
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{ "aug", AUG, 0 },
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{ "sep", SEP, 0 },
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{ "oct", OCT, 0 },
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{ "nov", NOV, 0 },
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{ "dec", DEC, 0 },
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{ "sunday", SUN, 0 },
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{ "sun", SUN, 0 },
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{ "monday", MON, 0 },
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{ "mon", MON, 0 },
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{ "tuesday", TUE, 0 },
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{ "tue", TUE, 0 },
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{ "wednesday", WED, 0 },
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{ "wed", WED, 0 },
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{ "thursday", THU, 0 },
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{ "thu", THU, 0 },
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{ "friday", FRI, 0 },
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{ "fri", FRI, 0 },
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{ "saturday", SAT, 0 },
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{ "sat", SAT, 0 },
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};
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/* File scope variables */
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static char **scp; /* scanner - pointer at arglist */
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static char scc; /* scanner - count of remaining arguments */
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static char *sct; /* scanner - next char pointer in current argument */
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static int need; /* scanner - need to advance to next argument */
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static char *sc_token; /* scanner - token buffer */
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static size_t sc_len; /* scanner - length of token buffer */
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static int sc_tokid; /* scanner - token id */
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static int sc_tokplur; /* scanner - is token plural? */
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#ifndef lint
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#if 0
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static char rcsid[] = "$OpenBSD: parsetime.c,v 1.4 1997/03/01 23:40:10 millert Exp $";
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#else
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__RCSID("$NetBSD: parsetime.c,v 1.14 2006/01/03 00:15:45 garbled Exp $");
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#endif
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#endif
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/* Local functions */
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static void assign_date (struct tm *, long, long, long);
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static void dateadd (int, struct tm *);
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static void expect (int);
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static void init_scanner (int, char **);
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static void month (struct tm *);
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static int parse_token (char *);
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static void plonk (int);
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static void plus (struct tm *);
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static void tod (struct tm *);
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static int token (void);
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/*
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* parse a token, checking if it's something special to us
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*/
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static int
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parse_token(char *arg)
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{
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int i;
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for (i=0; i < sizeof(Specials) / sizeof(Specials[0]); i++) {
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if (strcasecmp(Specials[i].name, arg) == 0) {
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sc_tokplur = Specials[i].plural;
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return (sc_tokid = Specials[i].value);
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}
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}
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/* not special - must be some random id */
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return (ID);
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} /* parse_token */
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/*
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* init_scanner() sets up the scanner to eat arguments
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*/
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static void
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init_scanner(int argc, char **argv)
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{
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scp = argv;
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scc = argc;
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need = 1;
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sc_len = 1;
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while (argc-- > 0)
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sc_len += strlen(*argv++);
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if ((sc_token = (char *) malloc(sc_len)) == NULL)
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panic("Insufficient virtual memory");
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} /* init_scanner */
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/*
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* token() fetches a token from the input stream
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*/
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static int
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token(void)
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{
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int idx;
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while (1) {
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(void)memset(sc_token, 0, sc_len);
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sc_tokid = EOF;
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sc_tokplur = 0;
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idx = 0;
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/*
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* if we need to read another argument, walk along the
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* argument list; when we fall off the arglist, we'll
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* just return EOF forever
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*/
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if (need) {
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if (scc < 1)
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return (sc_tokid);
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sct = *scp;
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scp++;
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scc--;
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need = 0;
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}
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/*
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* eat whitespace now - if we walk off the end of the argument,
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* we'll continue, which puts us up at the top of the while loop
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* to fetch the next argument in
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*/
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while (isspace((unsigned char)*sct))
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++sct;
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if (!*sct) {
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need = 1;
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continue;
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}
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/*
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* preserve the first character of the new token
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*/
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sc_token[0] = *sct++;
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/*
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* then see what it is
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*/
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if (isdigit((unsigned char)sc_token[0])) {
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while (isdigit((unsigned char)*sct))
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sc_token[++idx] = *sct++;
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sc_token[++idx] = 0;
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return ((sc_tokid = NUMBER));
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} else if (isalpha((unsigned char)sc_token[0])) {
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while (isalpha((unsigned char)*sct))
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sc_token[++idx] = *sct++;
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sc_token[++idx] = 0;
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return (parse_token(sc_token));
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}
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else if (sc_token[0] == ':' || sc_token[0] == '.')
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return ((sc_tokid = DOT));
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else if (sc_token[0] == '+')
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return ((sc_tokid = PLUS));
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else if (sc_token[0] == '/')
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return ((sc_tokid = SLASH));
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else
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return ((sc_tokid = JUNK));
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} /* while (1) */
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} /* token */
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/*
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* plonk() gives an appropriate error message if a token is incorrect
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*/
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static void
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plonk(int tok)
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{
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panic((tok == EOF) ? "incomplete time" : "garbled time");
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} /* plonk */
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/*
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* expect() gets a token and dies most horribly if it's not the token we want
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*/
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static void
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expect(int desired)
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{
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if (token() != desired)
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plonk(sc_tokid); /* and we die here... */
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} /* expect */
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/*
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* dateadd() adds a number of minutes to a date. It is extraordinarily
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* stupid regarding day-of-month overflow, and will most likely not
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* work properly
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*/
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static void
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dateadd(int minutes, struct tm *tm)
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{
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/* increment days */
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while (minutes > 24*60) {
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minutes -= 24*60;
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tm->tm_mday++;
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}
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/* increment hours */
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while (minutes > 60) {
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minutes -= 60;
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tm->tm_hour++;
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if (tm->tm_hour > 23) {
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tm->tm_mday++;
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tm->tm_hour = 0;
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}
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}
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/* increment minutes */
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tm->tm_min += minutes;
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if (tm->tm_min > 59) {
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tm->tm_hour++;
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tm->tm_min -= 60;
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if (tm->tm_hour > 23) {
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tm->tm_mday++;
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tm->tm_hour = 0;
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}
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}
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} /* dateadd */
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/*
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* plus() parses a now + time
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*
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* at [NOW] PLUS NUMBER [MINUTES|HOURS|DAYS|WEEKS]
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*
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*/
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static void
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plus(struct tm *tm)
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{
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int delay;
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int expectplur;
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expect(NUMBER);
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delay = atoi(sc_token);
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expectplur = (delay != 1) ? 1 : 0;
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switch (token()) {
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case WEEKS:
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delay *= 7;
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case DAYS:
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delay *= 24;
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case HOURS:
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delay *= 60;
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case MINUTES:
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if (expectplur != sc_tokplur)
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(void)fprintf(stderr, "at: pluralization is wrong\n");
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dateadd(delay, tm);
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return;
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}
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plonk(sc_tokid);
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} /* plus */
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/*
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* tod() computes the time of day
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* [NUMBER [DOT NUMBER] [AM|PM]]
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*/
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static void
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tod(struct tm *tm)
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{
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int hour, minute = 0;
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size_t tlen;
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hour = atoi(sc_token);
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tlen = strlen(sc_token);
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/*
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* first pick out the time of day - if it's 4 digits, we assume
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* a HHMM time, otherwise it's HH DOT MM time
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*/
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if (token() == DOT) {
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expect(NUMBER);
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minute = atoi(sc_token);
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token();
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} else if (tlen == 4) {
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minute = hour % 100;
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hour = hour / 100;
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}
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if (minute > 59)
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panic("garbled time");
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/*
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* check if an AM or PM specifier was given
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*/
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if (sc_tokid == AM || sc_tokid == PM) {
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if (hour > 12)
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panic("garbled time");
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if (sc_tokid == PM) {
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if (hour != 12) /* 12:xx PM is 12:xx, not 24:xx */
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hour += 12;
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} else {
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if (hour == 12) /* 12:xx AM is 00:xx, not 12:xx */
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hour = 0;
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}
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token();
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} else if (hour > 23)
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panic("garbled time");
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/*
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* if we specify an absolute time, we don't want to bump the day even
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* if we've gone past that time - but if we're specifying a time plus
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* a relative offset, it's okay to bump things
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*/
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if ((sc_tokid == EOF || sc_tokid == PLUS) && tm->tm_hour > hour) {
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tm->tm_mday++;
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tm->tm_wday++;
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}
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tm->tm_hour = hour;
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tm->tm_min = minute;
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} /* tod */
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/*
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* assign_date() assigns a date, wrapping to next year if needed
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*/
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static void
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assign_date(struct tm *tm, long mday, long mon, long year)
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{
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if (year > 99) {
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if (year >= TM_YEAR_BASE)
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year -= TM_YEAR_BASE;
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else
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panic("garbled time");
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}
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if (year >= 0) {
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if (year < 70)
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tm->tm_year = year + 2000 - TM_YEAR_BASE;
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else
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tm->tm_year = year + 1900 - TM_YEAR_BASE;
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}
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else { /* year < 0 */
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if (tm->tm_mon > mon ||
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(tm->tm_mon == mon && tm->tm_mday > mday))
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tm->tm_year++;
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}
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tm->tm_mday = mday;
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tm->tm_mon = mon;
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} /* assign_date */
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/*
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* month() picks apart a month specification
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*
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* /[<month> NUMBER [NUMBER]] \
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* |[TOMORROW] |
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* |[DAY OF WEEK] |
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* |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
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* \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
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*/
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static void
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month(struct tm *tm)
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{
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int year = (-1);
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int mday, wday, mon;
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size_t tlen;
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mday = 0;
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switch (sc_tokid) {
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case PLUS:
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plus(tm);
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break;
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case TOMORROW:
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/* do something tomorrow */
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tm->tm_mday++;
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tm->tm_wday++;
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case TODAY:
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/* force ourselves to stay in today - no further processing */
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token();
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break;
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case JAN: case FEB: case MAR: case APR: case MAY: case JUN:
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case JUL: case AUG: case SEP: case OCT: case NOV: case DEC:
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/*
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* do month mday [year]
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*/
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mon = sc_tokid - JAN;
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expect(NUMBER);
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mday = atoi(sc_token);
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if (token() == NUMBER) {
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year = atoi(sc_token);
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token();
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}
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assign_date(tm, mday, mon, year);
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break;
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case SUN: case MON: case TUE:
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case WED: case THU: case FRI:
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case SAT:
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/* do a particular day of the week */
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wday = sc_tokid - SUN;
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mday = tm->tm_mday;
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/* if this day is < today, then roll to next week */
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if (wday < tm->tm_wday)
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mday += 7 - (tm->tm_wday - wday);
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else
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mday += (wday - tm->tm_wday);
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tm->tm_wday = wday;
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assign_date(tm, mday, tm->tm_mon, tm->tm_year + TM_YEAR_BASE);
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break;
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case NUMBER:
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/*
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* get numeric MMDDYY, mm/dd/yy, or dd.mm.yy
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*/
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tlen = strlen(sc_token);
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mon = atoi(sc_token);
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token();
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if (sc_tokid == SLASH || sc_tokid == DOT) {
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int sep;
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sep = sc_tokid;
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expect(NUMBER);
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mday = atoi(sc_token);
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if (token() == sep) {
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expect(NUMBER);
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year = atoi(sc_token);
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token();
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}
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/*
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* flip months and days for european timing
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*/
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if (sep == DOT) {
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int x = mday;
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mday = mon;
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mon = x;
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}
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} else if (tlen == 6 || tlen == 8) {
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if (tlen == 8) {
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year = (mon % 10000) - 1900;
|
|
mon /= 10000;
|
|
} else {
|
|
year = mon % 100;
|
|
mon /= 100;
|
|
}
|
|
mday = mon % 100;
|
|
mon /= 100;
|
|
} else
|
|
panic("garbled time");
|
|
|
|
mon--;
|
|
if (mon < 0 || mon > 11 || mday < 1 || mday > 31)
|
|
panic("garbled time");
|
|
|
|
assign_date(tm, mday, mon, year);
|
|
break;
|
|
} /* case */
|
|
} /* month */
|
|
|
|
|
|
/* Global functions */
|
|
|
|
time_t
|
|
parsetime(int argc, char **argv)
|
|
{
|
|
/*
|
|
* Do the argument parsing, die if necessary, and return the
|
|
* time the job should be run.
|
|
*/
|
|
time_t nowtimer, runtimer;
|
|
struct tm nowtime, runtime;
|
|
int hr = 0;
|
|
/* this MUST be initialized to zero for midnight/noon/teatime */
|
|
|
|
nowtimer = time(NULL);
|
|
nowtime = *localtime(&nowtimer);
|
|
|
|
runtime = nowtime;
|
|
runtime.tm_sec = 0;
|
|
runtime.tm_isdst = 0;
|
|
|
|
if (argc <= optind)
|
|
usage();
|
|
|
|
init_scanner(argc - optind, argv + optind);
|
|
|
|
switch (token()) {
|
|
case NOW: /* now is optional prefix for PLUS tree */
|
|
expect(PLUS);
|
|
case PLUS:
|
|
plus(&runtime);
|
|
break;
|
|
|
|
case NUMBER:
|
|
tod(&runtime);
|
|
month(&runtime);
|
|
break;
|
|
|
|
/*
|
|
* evil coding for TEATIME|NOON|MIDNIGHT - we've initialised
|
|
* hr to zero up above, then fall into this case in such a
|
|
* way so we add +12 +4 hours to it for teatime, +12 hours
|
|
* to it for noon, and nothing at all for midnight, then
|
|
* set our runtime to that hour before leaping into the
|
|
* month scanner
|
|
*/
|
|
case TEATIME:
|
|
hr += 4;
|
|
case NOON:
|
|
hr += 12;
|
|
case MIDNIGHT:
|
|
if (runtime.tm_hour >= hr) {
|
|
runtime.tm_mday++;
|
|
runtime.tm_wday++;
|
|
}
|
|
runtime.tm_hour = hr;
|
|
runtime.tm_min = 0;
|
|
token();
|
|
/* fall through to month setting */
|
|
default:
|
|
month(&runtime);
|
|
break;
|
|
} /* ugly case statement */
|
|
expect(EOF);
|
|
|
|
/*
|
|
* adjust for daylight savings time
|
|
*/
|
|
runtime.tm_isdst = -1;
|
|
runtimer = mktime(&runtime);
|
|
if (runtime.tm_isdst > 0) {
|
|
runtimer -= 3600;
|
|
runtimer = mktime(&runtime);
|
|
}
|
|
|
|
if (runtimer < 0)
|
|
panic("Time not valid (possibly due to daylight saving time)");
|
|
|
|
if (nowtimer > runtimer)
|
|
panic("Trying to travel back in time");
|
|
|
|
return (runtimer);
|
|
} /* parsetime */
|