654 lines
15 KiB
C
654 lines
15 KiB
C
/* $NetBSD: parsetime.c,v 1.20 2019/02/16 17:56:57 kre 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 <err.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdbool.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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#include "stime.h"
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/* Structures and unions */
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typedef 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, MONTHS, YEARS,
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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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TOKEOF /* EOF marker */
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} tokid_t;
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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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static const struct {
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const char *name; /* token name */
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tokid_t value; /* token id */
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bool plural; /* is this plural? */
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} Specials[] = {
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{"midnight", MIDNIGHT, false}, /* 00:00:00 of today or tomorrow */
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{"noon", NOON, false}, /* 12:00:00 of today or tomorrow */
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{"teatime", TEATIME, false}, /* 16:00:00 of today or tomorrow */
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{"am", AM, false}, /* morning times for 0-12 clock */
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{"pm", PM, false}, /* evening times for 0-12 clock */
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{"tomorrow", TOMORROW, false}, /* execute 24 hours from time */
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{"today", TODAY, false}, /* execute today - don't advance time */
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{"now", NOW, false}, /* opt prefix for PLUS */
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{"minute", MINUTES, false}, /* minutes multiplier */
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{"min", MINUTES, false},
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{"m", MINUTES, false},
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{"minutes", MINUTES, true}, /* (pluralized) */
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{"hour", HOURS, false}, /* hours ... */
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{"hr", HOURS, false}, /* abbreviated */
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{"h", HOURS, false},
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{"hours", HOURS, true}, /* (pluralized) */
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{"day", DAYS, false}, /* days ... */
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{"d", DAYS, false},
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{"days", DAYS, true}, /* (pluralized) */
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{"week", WEEKS, false}, /* week ... */
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{"w", WEEKS, false},
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{"weeks", WEEKS, true}, /* (pluralized) */
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{ "month", MONTHS, 0 }, /* month ... */
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{ "months", MONTHS, 1 }, /* (pluralized) */
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{ "year", YEARS, 0 }, /* year ... */
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{ "years", YEARS, 1 }, /* (pluralized) */
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{"jan", JAN, false},
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{"feb", FEB, false},
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{"mar", MAR, false},
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{"apr", APR, false},
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{"may", MAY, false},
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{"jun", JUN, false},
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{"jul", JUL, false},
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{"aug", AUG, false},
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{"sep", SEP, false},
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{"oct", OCT, false},
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{"nov", NOV, false},
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{"dec", DEC, false},
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{"january", JAN, false},
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{"february", FEB, false},
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{"march", MAR, false},
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{"april", APR, false},
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{"may", MAY, false},
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{"june", JUN, false},
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{"july", JUL, false},
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{"august", AUG, false},
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{"september", SEP, false},
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{"october", OCT, false},
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{"november", NOV, false},
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{"december", DEC, false},
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{"sunday", SUN, false},
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{"sun", SUN, false},
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{"monday", MON, false},
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{"mon", MON, false},
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{"tuesday", TUE, false},
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{"tue", TUE, false},
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{"wednesday", WED, false},
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{"wed", WED, false},
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{"thursday", THU, false},
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{"thu", THU, false},
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{"friday", FRI, false},
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{"fri", FRI, false},
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{"saturday", SAT, false},
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{"sat", SAT, false}
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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 bool 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 tokid_t sc_tokid;/* scanner - token id */
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static bool 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 1.20 2019/02/16 17:56:57 kre 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 *, int, int, int);
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static void expect(tokid_t);
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static void init_scanner(int, char **);
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static void month(struct tm *);
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static tokid_t parse_token(char *);
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static void plonk(tokid_t) __dead;
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static void plus(struct tm *);
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static void tod(struct tm *);
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static tokid_t 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 tokid_t
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parse_token(char *arg)
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{
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size_t i;
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for (i=0; i < __arraycount(Specials); 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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}
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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 = true;
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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 = malloc(sc_len)) == NULL)
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panic("Insufficient virtual memory");
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}
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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 tokid_t
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token(void)
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{
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int idx;
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for(;;) {
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(void)memset(sc_token, 0, sc_len);
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sc_tokid = TOKEOF;
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sc_tokplur = false;
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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 TOKEOF 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 = false;
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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 = true;
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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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}
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}
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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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__dead
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static void
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plonk(tokid_t tok)
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{
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panic(tok == TOKEOF ? "incomplete time" : "garbled time");
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}
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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(tokid_t 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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}
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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|MONTHS|YEARS]
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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;
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switch (token()) {
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case YEARS:
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tm->tm_year += delay;
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break;
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case MONTHS:
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tm->tm_mon += delay;
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break;
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case WEEKS:
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delay *= 7;
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/*FALLTHROUGH*/
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case DAYS:
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tm->tm_mday += delay;
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break;
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case HOURS:
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tm->tm_hour += delay;
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break;
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case MINUTES:
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tm->tm_min += delay;
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break;
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default:
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plonk(sc_tokid);
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break;
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}
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if (expectplur != sc_tokplur)
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warnx("pluralization is wrong");
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tm->tm_isdst = -1;
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if (mktime(tm) == -1)
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plonk(sc_tokid);
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}
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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;
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size_t tlen;
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minute = 0;
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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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(void)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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(void)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 == TOKEOF || sc_tokid == PLUS) && (tm->tm_hour > hour ||
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(tm->tm_hour == hour && tm->tm_min > minute))) {
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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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}
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/*
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* assign_date() assigns a date, wrapping to next year if needed.
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* Accept years in 4-digit, 2-digit, or current year (-1).
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*/
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static void
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assign_date(struct tm *tm, int mday, int mon, int year)
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{
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if (year > 99) { /* four digit year */
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if (year >= TM_YEAR_BASE)
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tm->tm_year = year - TM_YEAR_BASE;
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else
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panic("garbled time");
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}
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else if (year >= 0) { /* two digit year */
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tm->tm_year = conv_2dig_year(year) - TM_YEAR_BASE;
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}
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else if (year == -1) { /* year not given (use default in tm) */
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/* allow for 1 year range from current date */
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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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else
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panic("invalid year");
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tm->tm_mday = mday;
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tm->tm_mon = mon;
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}
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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;
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int mday, wday, mon;
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size_t tlen;
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year = -1;
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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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/*FALLTHROUGH*/
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case TODAY:
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/* force ourselves to stay in today - no further processing */
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(void)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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(void)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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(void)token();
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if (sc_tokid == SLASH || sc_tokid == DOT) {
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tokid_t 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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(void)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) {
|
|
int x = mday;
|
|
mday = mon;
|
|
mon = x;
|
|
}
|
|
} else if (tlen == 6 || tlen == 8) {
|
|
if (tlen == 8) {
|
|
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;
|
|
default:
|
|
/* plonk(sc_tokid); */ /* XXX - die here? */
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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;
|
|
|
|
if (argc <= optind)
|
|
usage();
|
|
|
|
init_scanner(argc - optind, argv + optind);
|
|
|
|
switch (token()) {
|
|
case NOW:
|
|
if (scc < 1)
|
|
return nowtimer;
|
|
|
|
/* now is optional prefix for PLUS tree */
|
|
expect(PLUS);
|
|
/*FALLTHROUGH*/
|
|
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;
|
|
/*FALLTHROUGH*/
|
|
case NOON:
|
|
hr += 12;
|
|
/*FALLTHROUGH*/
|
|
case MIDNIGHT:
|
|
if (runtime.tm_hour >= hr) {
|
|
runtime.tm_mday++;
|
|
runtime.tm_wday++;
|
|
}
|
|
runtime.tm_hour = hr;
|
|
runtime.tm_min = 0;
|
|
(void)token();
|
|
/*FALLTHROUGH*/ /* fall through to month setting */
|
|
default:
|
|
month(&runtime);
|
|
break;
|
|
}
|
|
expect(TOKEOF);
|
|
|
|
/*
|
|
* adjust for daylight savings time
|
|
*/
|
|
runtime.tm_isdst = -1;
|
|
runtimer = mktime(&runtime);
|
|
|
|
if (runtimer == (time_t)-1)
|
|
panic("Invalid time");
|
|
|
|
if (nowtimer > runtimer)
|
|
panic("Trying to travel back in time");
|
|
|
|
return runtimer;
|
|
}
|