592 lines
13 KiB
C
592 lines
13 KiB
C
/*
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* parsetime.c - parse time for at(1)
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* Copyright (C) 1993 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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* All rights reserved.
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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 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 | |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
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* \TEATIME / \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 <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 <unistd.h>
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#include <ctype.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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/* 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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};
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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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} Specials[] = {
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{ "midnight", MIDNIGHT }, /* 00:00:00 of today or tomorrow */
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{ "noon", NOON }, /* 12:00:00 of today or tomorrow */
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{ "teatime", TEATIME }, /* 16:00:00 of today or tomorrow */
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{ "am", AM }, /* morning times for 0-12 clock */
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{ "pm", PM }, /* evening times for 0-12 clock */
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{ "tomorrow", TOMORROW }, /* execute 24 hours from time */
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{ "today", TODAY }, /* execute today - don't advance time */
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{ "now", NOW }, /* opt prefix for PLUS */
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{ "minute", MINUTES }, /* minutes multiplier */
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{ "min", MINUTES },
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{ "m", MINUTES },
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{ "minutes", MINUTES }, /* (pluralized) */
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{ "hour", HOURS }, /* hours ... */
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{ "hr", HOURS }, /* abbreviated */
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{ "h", HOURS },
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{ "hours", HOURS }, /* (pluralized) */
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{ "day", DAYS }, /* days ... */
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{ "d", DAYS },
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{ "days", DAYS }, /* (pluralized) */
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{ "week", WEEKS }, /* week ... */
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{ "w", WEEKS },
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{ "weeks", WEEKS }, /* (pluralized) */
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{ "jan", JAN },
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{ "feb", FEB },
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{ "mar", MAR },
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{ "apr", APR },
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{ "may", MAY },
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{ "jun", JUN },
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{ "jul", JUL },
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{ "aug", AUG },
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{ "sep", SEP },
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{ "oct", OCT },
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{ "nov", NOV },
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{ "dec", DEC }
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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 - lenght of token buffer */
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static int sc_tokid; /* scanner - token id */
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static char rcsid[] = "$Id: parsetime.c,v 1.1 1994/01/05 01:09:08 nate Exp $";
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/* Local functions */
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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(arg)
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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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return sc_tokid = Specials[i].value;
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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(argc, argv)
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int argc;
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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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sc_token = (char *) malloc(sc_len);
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if (sc_token == 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()
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{
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int idx;
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while (1) {
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memset(sc_token, 0, sc_len);
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sc_tokid = EOF;
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idx = 0;
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/*
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* if we need to read another argument, walk along the argument list;
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* when we fall off the arglist, we'll 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(*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(sc_token[0])) {
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while (isdigit(*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(sc_token[0])) {
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while (isalpha(*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 (*sct == '/')
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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(tok)
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int tok;
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{
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panic((tok == EOF) ? "incomplete time"
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: "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(desired)
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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(minutes, tm)
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int minutes;
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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(tm)
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struct tm *tm;
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{
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int delay;
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expect(NUMBER);
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delay = atoi(sc_token);
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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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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(tm)
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struct tm *tm;
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{
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int hour, minute = 0;
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int 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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if (minute > 59)
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panic("garbled time");
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token();
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} else if (tlen == 4) {
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minute = hour%100;
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if (minute > 59)
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panic("garbeld time");
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hour = hour/100;
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}
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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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hour += 12;
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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_hour = hour;
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tm->tm_min = minute;
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if (tm->tm_hour == 24) {
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tm->tm_hour = 0;
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tm->tm_mday++;
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}
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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(tm, mday, mon, year)
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struct tm *tm;
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long mday, mon, year;
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{
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if (year > 99) {
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if (year > 1899)
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year -= 1900;
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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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(tm->tm_mon > mon ||(tm->tm_mon == mon && tm->tm_mday > mday)))
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year = tm->tm_year + 1;
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tm->tm_mday = mday;
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tm->tm_mon = mon;
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if (year >= 0)
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tm->tm_year = year;
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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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* |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(tm)
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struct tm *tm;
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{
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long year= (-1);
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long mday, mon;
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int tlen;
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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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case TODAY: /* 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 = atol(sc_token);
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if (token() == NUMBER) {
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year = atol(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 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 = atol(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 = atol(sc_token);
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if (token() == sep) {
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expect(NUMBER);
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year = atol(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;
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mon /= 10000;
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} else {
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year = mon % 100;
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mon /= 100;
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}
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mday = mon % 100;
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mon /= 100;
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} else
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panic("garbled time");
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mon--;
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if (mon < 0 || mon > 11 || mday < 1 || mday > 31)
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panic("garbled time");
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assign_date(tm, mday, mon, year);
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break;
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} /* case */
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} /* month */
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/* Global functions */
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time_t
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parsetime(argc, argv)
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int argc;
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char **argv;
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{
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/*
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* Do the argument parsing, die if necessary, and return the time the job
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* should be run.
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*/
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time_t nowtimer, runtimer;
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struct tm nowtime, runtime;
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int hr = 0;
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/* this MUST be initialized to zero for midnight/noon/teatime */
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nowtimer = time(NULL);
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nowtime = *localtime(&nowtimer);
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runtime = nowtime;
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runtime.tm_sec = 0;
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runtime.tm_isdst = 0;
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if (argc <= optind)
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usage();
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init_scanner(argc-optind, argv+optind);
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switch (token()) {
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case NOW: /* now is optional prefix for PLUS tree */
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expect(PLUS);
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case PLUS:
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plus(&runtime);
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break;
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case NUMBER:
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tod(&runtime);
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month(&runtime);
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break;
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/*
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* evil coding for TEATIME|NOON|MIDNIGHT - we've initialised
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* hr to zero up above, then fall into this case in such a
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* way so we add +12 +4 hours to it for teatime, +12 hours
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* to it for noon, and nothing at all for midnight, then
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* set our runtime to that hour before leaping into the
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* month scanner
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*/
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case TEATIME:
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hr += 4;
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case NOON:
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hr += 12;
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case MIDNIGHT:
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if (runtime.tm_hour >= hr)
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runtime.tm_mday++;
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runtime.tm_hour = hr;
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runtime.tm_min = 0;
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token();
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/* fall through to month setting */
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default:
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month(&runtime);
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break;
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} /* ugly case statement */
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expect(EOF);
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/*
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* adjust for daylight savings time
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*/
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runtime.tm_isdst = -1;
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runtimer = mktime(&runtime);
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if (runtime.tm_isdst > 0) {
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runtimer -= 3600;
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runtimer = mktime(&runtime);
|
|
}
|
|
|
|
if (runtimer < 0)
|
|
panic("garbled time");
|
|
|
|
if (nowtimer > runtimer)
|
|
panic("Trying to travel back in time");
|
|
|
|
return runtimer;
|
|
} /* parsetime */
|