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File:	usr.bin/at/parsetime.c	Lines:	0	247	0.0 %
Date:	2016-12-06	Branches:	0	173	0.0 %


/*	$OpenBSD: parsetime.c,v 1.26 2015/11/11 17:42:51 millert Exp $	*/

/*
 * parsetime.c - parse time for at(1)
 * Copyright (C) 1993, 1994  Thomas Koenig
 *
 * modifications for english-language times
 * Copyright (C) 1993  David Parsons
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author(s) may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  at [NOW] PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS|MONTHS|YEARS
 *     /NUMBER [DOT NUMBER] [AM|PM]\ /[MONTH NUMBER [NUMBER]]             \
 *     |NOON                       | |[TOMORROW]                          |
 *     |MIDNIGHT                   | |[DAY OF WEEK]                       |
 *     \TEATIME                    / |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
 *                                   \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS|MONTHS|YEARS/
 */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "globals.h"
#include "at.h"

/* Structures and unions */

enum {	/* symbols */
	MIDNIGHT, NOON, TEATIME,
	PM, AM, TOMORROW, TODAY, NOW,
	MINUTES, HOURS, DAYS, WEEKS, MONTHS, YEARS,
	NUMBER, NEXT, PLUS, DOT, SLASH, ID, JUNK,
	JAN, FEB, MAR, APR, MAY, JUN,
	JUL, AUG, SEP, OCT, NOV, DEC,
	SUN, MON, TUE, WED, THU, FRI, SAT
};

/*
 * parse translation table - table driven parsers can be your FRIEND!
 */
struct {
	char *name;	/* token name */
	int value;	/* token id */
	int plural;	/* is this plural? */
} Specials[] = {
	{ "midnight", MIDNIGHT, 0 },	/* 00:00:00 of today or tomorrow */
	{ "noon", NOON, 0 },		/* 12:00:00 of today or tomorrow */
	{ "teatime", TEATIME, 0 },	/* 16:00:00 of today or tomorrow */
	{ "am", AM, 0 },		/* morning times for 0-12 clock */
	{ "pm", PM, 0 },		/* evening times for 0-12 clock */
	{ "tomorrow", TOMORROW, 0 },	/* execute 24 hours from time */
	{ "today", TODAY, 0 },		/* execute today - don't advance time */
	{ "now", NOW, 0 },		/* opt prefix for PLUS */
	{ "next", NEXT, 0 },		/* opt prefix for + 1 */

	{ "minute", MINUTES, 0 },	/* minutes multiplier */
	{ "min", MINUTES, 0 },
	{ "m", MINUTES, 0 },
	{ "minutes", MINUTES, 1 },	/* (pluralized) */
	{ "hour", HOURS, 0 },		/* hours ... */
	{ "hr", HOURS, 0 },		/* abbreviated */
	{ "h", HOURS, 0 },
	{ "hours", HOURS, 1 },		/* (pluralized) */
	{ "day", DAYS, 0 },		/* days ... */
	{ "d", DAYS, 0 },
	{ "days", DAYS, 1 },		/* (pluralized) */
	{ "week", WEEKS, 0 },		/* week ... */
	{ "w", WEEKS, 0 },
	{ "weeks", WEEKS, 1 },		/* (pluralized) */
	{ "month", MONTHS, 0 },		/* month ... */
	{ "mo", MONTHS, 0 },
	{ "mth", MONTHS, 0 },
	{ "months", MONTHS, 1 },	/* (pluralized) */
	{ "year", YEARS, 0 },		/* year ... */
	{ "y", YEARS, 0 },
	{ "years", YEARS, 1 },		/* (pluralized) */
	{ "jan", JAN, 0 },
	{ "feb", FEB, 0 },
	{ "mar", MAR, 0 },
	{ "apr", APR, 0 },
	{ "may", MAY, 0 },
	{ "jun", JUN, 0 },
	{ "jul", JUL, 0 },
	{ "aug", AUG, 0 },
	{ "sep", SEP, 0 },
	{ "oct", OCT, 0 },
	{ "nov", NOV, 0 },
	{ "dec", DEC, 0 },
	{ "january", JAN,0 },
	{ "february", FEB,0 },
	{ "march", MAR,0 },
	{ "april", APR,0 },
	{ "may", MAY,0 },
	{ "june", JUN,0 },
	{ "july", JUL,0 },
	{ "august", AUG,0 },
	{ "september", SEP,0 },
	{ "october", OCT,0 },
	{ "november", NOV,0 },
	{ "december", DEC,0 },
	{ "sunday", SUN, 0 },
	{ "sun", SUN, 0 },
	{ "monday", MON, 0 },
	{ "mon", MON, 0 },
	{ "tuesday", TUE, 0 },
	{ "tue", TUE, 0 },
	{ "wednesday", WED, 0 },
	{ "wed", WED, 0 },
	{ "thursday", THU, 0 },
	{ "thu", THU, 0 },
	{ "friday", FRI, 0 },
	{ "fri", FRI, 0 },
	{ "saturday", SAT, 0 },
	{ "sat", SAT, 0 },
};

static char **scp;	/* scanner - pointer at arglist */
static int scc;		/* scanner - count of remaining arguments */
static char *sct;	/* scanner - next char pointer in current argument */
static int need;	/* scanner - need to advance to next argument */
static char *sc_token;	/* scanner - token buffer */
static size_t sc_len;   /* scanner - length of token buffer */
static int sc_tokid;	/* scanner - token id */
static int sc_tokplur;	/* scanner - is token plural? */

/*
 * parse a token, checking if it's something special to us
 */
static int
parse_token(char *arg)
{
	int i;

	for (i=0; i < sizeof(Specials) / sizeof(Specials[0]); i++) {
		if (strcasecmp(Specials[i].name, arg) == 0) {
			sc_tokplur = Specials[i].plural;
		    	return (sc_tokid = Specials[i].value);
		}
	}

	/* not special - must be some random id */
	return (ID);
}


/*
 * init_scanner() sets up the scanner to eat arguments
 */
static int
init_scanner(int argc, char **argv)
{
	scp = argv;
	scc = argc;
	need = 1;
	sc_len = 1;
	while (argc-- > 0)
		sc_len += strlen(*argv++);

	if ((sc_token = malloc(sc_len)) == NULL) {
		warn(NULL);
		return (-1);
	}
	return (0);
}

/*
 * token() fetches a token from the input stream
 */
static int
token(void)
{
	int idx;

	for (;;) {
		bzero(sc_token, sc_len);
		sc_tokid = EOF;
		sc_tokplur = 0;
		idx = 0;

		/*
		 * if we need to read another argument, walk along the
		 * argument list; when we fall off the arglist, we'll
		 * just return EOF forever
		 */
		if (need) {
			if (scc < 1)
				return (sc_tokid);
			sct = *scp;
			scp++;
			scc--;
			need = 0;
		}
		/*
		 * eat whitespace now - if we walk off the end of the argument,
		 * we'll continue, which puts us up at the top of the while loop
		 * to fetch the next argument in
		 */
		while (isspace((unsigned char)*sct))
			++sct;
		if (!*sct) {
			need = 1;
			continue;
		}

		/*
		 * preserve the first character of the new token
		 */
		sc_token[0] = *sct++;

		/*
		 * then see what it is
		 */
		if (isdigit((unsigned char)sc_token[0])) {
			while (isdigit((unsigned char)*sct))
				sc_token[++idx] = *sct++;
			sc_token[++idx] = 0;
			return ((sc_tokid = NUMBER));
		} else if (isalpha((unsigned char)sc_token[0])) {
			while (isalpha((unsigned char)*sct))
				sc_token[++idx] = *sct++;
			sc_token[++idx] = 0;
			return (parse_token(sc_token));
		}
		else if (sc_token[0] == ':' || sc_token[0] == '.')
			return ((sc_tokid = DOT));
		else if (sc_token[0] == '+')
			return ((sc_tokid = PLUS));
		else if (sc_token[0] == '/')
			return ((sc_tokid = SLASH));
		else
			return ((sc_tokid = JUNK));
	}
}


/*
 * plonk() gives an appropriate error message if a token is incorrect
 */
static void
plonk(int tok)
{
	warnx("%s time", (tok == EOF) ? "incomplete" : "garbled");
}


/*
 * expect() gets a token and returns -1 if it's not the token we want
 */
static int
expect(int desired)
{
	if (token() != desired) {
		plonk(sc_tokid);
		return (-1);
	}
	return (0);
}


/*
 * dateadd() adds a number of minutes to a date.  It is extraordinarily
 * stupid regarding day-of-month overflow, and will most likely not
 * work properly
 */
static void
dateadd(int minutes, struct tm *tm)
{
	/* increment days */

	while (minutes > 24*60) {
		minutes -= 24*60;
		tm->tm_mday++;
	}

	/* increment hours */
	while (minutes > 60) {
		minutes -= 60;
		tm->tm_hour++;
		if (tm->tm_hour > 23) {
			tm->tm_mday++;
			tm->tm_hour = 0;
		}
	}

	/* increment minutes */
	tm->tm_min += minutes;

	if (tm->tm_min > 59) {
		tm->tm_hour++;
		tm->tm_min -= 60;

		if (tm->tm_hour > 23) {
			tm->tm_mday++;
			tm->tm_hour = 0;
		}
	}
}


/*
 * plus() parses a now + time
 *
 *  at [NOW] PLUS NUMBER [MINUTES|HOURS|DAYS|WEEKS|MONTHS|YEARS]
 *
 */
static int
plus(struct tm *tm)
{
	int increment;
	int expectplur;

	if (sc_tokid == NEXT) {
		increment = 1;
		expectplur = 0;
	} else {
		if (expect(NUMBER) != 0)
			return (-1);
		increment = atoi(sc_token);
		expectplur = (increment != 1) ? 1 : 0;
	}

	switch (token()) {
	case YEARS:
		tm->tm_year += increment;
		return (0);
	case MONTHS:
		tm->tm_mon += increment;
		while (tm->tm_mon >= 12) {
		    tm->tm_year++;
		    tm->tm_mon -= 12;
		}
		return (0);
	case WEEKS:
		increment *= 7;
		/* FALLTHROUGH */
	case DAYS:
		increment *= 24;
		/* FALLTHROUGH */
	case HOURS:
		increment *= 60;
		/* FALLTHROUGH */
	case MINUTES:
		if (expectplur != sc_tokplur)
			warnx("pluralization is wrong");
		dateadd(increment, tm);
		return (0);
	}

	plonk(sc_tokid);
	return (-1);
}


/*
 * tod() computes the time of day
 *     [NUMBER [DOT NUMBER] [AM|PM]]
 */
static int
tod(struct tm *tm)
{
	int hour, minute = 0;
	size_t tlen;

	hour = atoi(sc_token);
	tlen = strlen(sc_token);

	/*
	 * first pick out the time of day - if it's 4 digits, we assume
	 * a HHMM time, otherwise it's HH DOT MM time
	 */
	if (token() == DOT) {
		if (expect(NUMBER) != 0)
			return (-1);
		minute = atoi(sc_token);
		if (minute > 59)
			goto bad;
		token();
	} else if (tlen == 4) {
		minute = hour % 100;
		if (minute > 59)
			goto bad;
		hour = hour / 100;
	}

	/*
	 * check if an AM or PM specifier was given
	 */
	if (sc_tokid == AM || sc_tokid == PM) {
		if (hour > 12)
			goto bad;

		if (sc_tokid == PM) {
			if (hour != 12)	/* 12:xx PM is 12:xx, not 24:xx */
				hour += 12;
		} else {
			if (hour == 12)	/* 12:xx AM is 00:xx, not 12:xx */
				hour = 0;
		}
		token();
	} else if (hour > 23)
		goto bad;

	/*
	 * if we specify an absolute time, we don't want to bump the day even
	 * if we've gone past that time - but if we're specifying a time plus
	 * a relative offset, it's okay to bump things
	 */
	if ((sc_tokid == EOF || sc_tokid == PLUS || sc_tokid == NEXT) &&
	    tm->tm_hour > hour) {
		tm->tm_mday++;
		tm->tm_wday++;
	}

	tm->tm_hour = hour;
	tm->tm_min = minute;
	if (tm->tm_hour == 24) {
		tm->tm_hour = 0;
		tm->tm_mday++;
	}
	return (0);
bad:
	warnx("garbled time");
	return (-1);
}


/*
 * assign_date() assigns a date, wrapping to next year if needed
 */
static void
assign_date(struct tm *tm, int mday, int mon, int year)
{

	/*
	 * Convert year into tm_year format (year - 1900).
	 * We may be given the year in 2 digit, 4 digit, or tm_year format.
	 */
	if (year != -1) {
		if (year >= 1900)
			year -= 1900;	/* convert from 4 digit year */
		else if (year < 100) {
			/* Convert to tm_year assuming current century */
			year += (tm->tm_year / 100) * 100;

			if (year == tm->tm_year - 1)
				year++;		/* Common off by one error */
			else if (year < tm->tm_year)
				year += 100;	/* must be in next century */
		}
	}

	if (year < 0 &&
	    (tm->tm_mon > mon ||(tm->tm_mon == mon && tm->tm_mday > mday)))
		year = tm->tm_year + 1;

	tm->tm_mday = mday;
	tm->tm_mon = mon;

	if (year >= 0)
		tm->tm_year = year;
}


/*
 * month() picks apart a month specification
 *
 *  /[<month> NUMBER [NUMBER]]           \
 *  |[TOMORROW]                          |
 *  |[DAY OF WEEK]                       |
 *  |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
 *  \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS|MONTHS|YEARS/
 */
static int
month(struct tm *tm)
{
	int year = (-1);
	int mday, wday, mon;
	size_t tlen;

	switch (sc_tokid) {
	case NEXT:
	case PLUS:
		if (plus(tm) != 0)
			return (-1);
		break;

	case TOMORROW:
		/* do something tomorrow */
		tm->tm_mday++;
		tm->tm_wday++;
	case TODAY:
		/* force ourselves to stay in today - no further processing */
		token();
		break;

	case JAN: case FEB: case MAR: case APR: case MAY: case JUN:
	case JUL: case AUG: case SEP: case OCT: case NOV: case DEC:
		/*
		 * do month mday [year]
		 */
		mon = sc_tokid - JAN;
		if (expect(NUMBER) != 0)
			return (-1);
		mday = atoi(sc_token);
		if (token() == NUMBER) {
			year = atoi(sc_token);
			token();
		}
		assign_date(tm, mday, mon, year);
		break;

	case SUN: case MON: case TUE:
	case WED: case THU: case FRI:
	case SAT:
		/* do a particular day of the week */
		wday = sc_tokid - SUN;

		mday = tm->tm_mday;

		/* if this day is < today, then roll to next week */
		if (wday < tm->tm_wday)
			mday += 7 - (tm->tm_wday - wday);
		else
			mday += (wday - tm->tm_wday);

		tm->tm_wday = wday;

		assign_date(tm, mday, tm->tm_mon, tm->tm_year);
		break;

	case NUMBER:
		/*
		 * get numeric MMDDYY, mm/dd/yy, or dd.mm.yy
		 */
		tlen = strlen(sc_token);
		mon = atoi(sc_token);
		token();

		if (sc_tokid == SLASH || sc_tokid == DOT) {
			int sep;

			sep = sc_tokid;
			if (expect(NUMBER) != 0)
				return (-1);
			mday = atoi(sc_token);
			if (token() == sep) {
				if (expect(NUMBER) != 0)
					return (-1);
				year = atoi(sc_token);
				token();
			}

			/*
			 * flip months and days for european timing
			 */
			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
			goto bad;

		mon--;
		if (mon < 0 || mon > 11 || mday < 1 || mday > 31)
			goto bad;

		assign_date(tm, mday, mon, year);
		break;
	}
	return (0);
bad:
	warnx("garbled time");
	return (-1);
}


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 */

	if (argc == 0)
		return (-1);

	nowtimer = time(NULL);
	nowtime = *localtime(&nowtimer);

	runtime = nowtime;
	runtime.tm_sec = 0;
	runtime.tm_isdst = 0;

	if (init_scanner(argc, argv) == -1)
		return (-1);

	switch (token()) {
	case NOW:	/* now is optional prefix for PLUS tree */
		token();
		if (sc_tokid == EOF) {
			runtime = nowtime;
			break;
		}
		else if (sc_tokid != PLUS && sc_tokid != NEXT)
			plonk(sc_tokid);
	case NEXT:
	case PLUS:
		if (plus(&runtime) != 0)
			return (-1);
		break;

	case NUMBER:
		if (tod(&runtime) != 0 || month(&runtime) != 0)
			return (-1);
		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;
		token();
		/* fall through to month setting */
		/* FALLTHROUGH */
	default:
		if (month(&runtime) != 0)
			return (-1);
		break;
	} /* ugly case statement */
	if (expect(EOF) != 0)
		return (-1);

	/*
	 * adjust for daylight savings time
	 */
	runtime.tm_isdst = -1;
	runtimer = mktime(&runtime);

	if (runtimer < 0) {
		warnx("garbled time");
		return (-1);
	}

	if (nowtimer > runtimer) {
		warnx("cannot schedule jobs in the past");
		return (-1);
	}

	return (runtimer);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: parsetime.c,v 1.26 2015/11/11 17:42:51 millert Exp $ */
2
3			/*
4			* parsetime.c - parse time for at(1)
5			* Copyright (C) 1993, 1994 Thomas Koenig
6			*
7			* modifications for english-language times
8			* Copyright (C) 1993 David Parsons
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. The name of the author(s) may not be used to endorse or promote
16			* products derived from this software without specific prior written
17			* permission.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
20			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22			* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
23			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29			*
30			* at [NOW] PLUS NUMBER MINUTES\|HOURS\|DAYS\|WEEKS\|MONTHS\|YEARS
31			* /NUMBER [DOT NUMBER] [AM\|PM]\ /[MONTH NUMBER [NUMBER]] \
32			* \|NOON \| \|[TOMORROW] \|
33			* \|MIDNIGHT \| \|[DAY OF WEEK] \|
34			* \TEATIME / \|NUMBER [SLASH NUMBER [SLASH NUMBER]]\|
35			* \PLUS NUMBER MINUTES\|HOURS\|DAYS\|WEEKS\|MONTHS\|YEARS/
36			*/
37
38			#include <sys/types.h>
39
40			#include <err.h>
41			#include <errno.h>
42			#include <ctype.h>
43			#include <stdio.h>
44			#include <stdlib.h>
45			#include <string.h>
46			#include <time.h>
47			#include <unistd.h>
48
49			#include "globals.h"
50			#include "at.h"
51
52			/* Structures and unions */
53
54			enum { /* symbols */
55			MIDNIGHT, NOON, TEATIME,
56			PM, AM, TOMORROW, TODAY, NOW,
57			MINUTES, HOURS, DAYS, WEEKS, MONTHS, YEARS,
58			NUMBER, NEXT, PLUS, DOT, SLASH, ID, JUNK,
59			JAN, FEB, MAR, APR, MAY, JUN,
60			JUL, AUG, SEP, OCT, NOV, DEC,
61			SUN, MON, TUE, WED, THU, FRI, SAT
62			};
63
64			/*
65			* parse translation table - table driven parsers can be your FRIEND!
66			*/
67			struct {
68			char name; / token name */
69			int value; /* token id */
70			int plural; /* is this plural? */
71			} Specials[] = {
72			{ "midnight", MIDNIGHT, 0 }, /* 00:00:00 of today or tomorrow */
73			{ "noon", NOON, 0 }, /* 12:00:00 of today or tomorrow */
74			{ "teatime", TEATIME, 0 }, /* 16:00:00 of today or tomorrow */
75			{ "am", AM, 0 }, /* morning times for 0-12 clock */
76			{ "pm", PM, 0 }, /* evening times for 0-12 clock */
77			{ "tomorrow", TOMORROW, 0 }, /* execute 24 hours from time */
78			{ "today", TODAY, 0 }, /* execute today - don't advance time */
79			{ "now", NOW, 0 }, /* opt prefix for PLUS */
80			{ "next", NEXT, 0 }, /* opt prefix for + 1 */
81
82			{ "minute", MINUTES, 0 }, /* minutes multiplier */
83			{ "min", MINUTES, 0 },
84			{ "m", MINUTES, 0 },
85			{ "minutes", MINUTES, 1 }, /* (pluralized) */
86			{ "hour", HOURS, 0 }, /* hours ... */
87			{ "hr", HOURS, 0 }, /* abbreviated */
88			{ "h", HOURS, 0 },
89			{ "hours", HOURS, 1 }, /* (pluralized) */
90			{ "day", DAYS, 0 }, /* days ... */
91			{ "d", DAYS, 0 },
92			{ "days", DAYS, 1 }, /* (pluralized) */
93			{ "week", WEEKS, 0 }, /* week ... */
94			{ "w", WEEKS, 0 },
95			{ "weeks", WEEKS, 1 }, /* (pluralized) */
96			{ "month", MONTHS, 0 }, /* month ... */
97			{ "mo", MONTHS, 0 },
98			{ "mth", MONTHS, 0 },
99			{ "months", MONTHS, 1 }, /* (pluralized) */
100			{ "year", YEARS, 0 }, /* year ... */
101			{ "y", YEARS, 0 },
102			{ "years", YEARS, 1 }, /* (pluralized) */
103			{ "jan", JAN, 0 },
104			{ "feb", FEB, 0 },
105			{ "mar", MAR, 0 },
106			{ "apr", APR, 0 },
107			{ "may", MAY, 0 },
108			{ "jun", JUN, 0 },
109			{ "jul", JUL, 0 },
110			{ "aug", AUG, 0 },
111			{ "sep", SEP, 0 },
112			{ "oct", OCT, 0 },
113			{ "nov", NOV, 0 },
114			{ "dec", DEC, 0 },
115			{ "january", JAN,0 },
116			{ "february", FEB,0 },
117			{ "march", MAR,0 },
118			{ "april", APR,0 },
119			{ "may", MAY,0 },
120			{ "june", JUN,0 },
121			{ "july", JUL,0 },
122			{ "august", AUG,0 },
123			{ "september", SEP,0 },
124			{ "october", OCT,0 },
125			{ "november", NOV,0 },
126			{ "december", DEC,0 },
127			{ "sunday", SUN, 0 },
128			{ "sun", SUN, 0 },
129			{ "monday", MON, 0 },
130			{ "mon", MON, 0 },
131			{ "tuesday", TUE, 0 },
132			{ "tue", TUE, 0 },
133			{ "wednesday", WED, 0 },
134			{ "wed", WED, 0 },
135			{ "thursday", THU, 0 },
136			{ "thu", THU, 0 },
137			{ "friday", FRI, 0 },
138			{ "fri", FRI, 0 },
139			{ "saturday", SAT, 0 },
140			{ "sat", SAT, 0 },
141			};
142
143			static char *scp; / scanner - pointer at arglist */
144			static int scc; /* scanner - count of remaining arguments */
145			static char sct; / scanner - next char pointer in current argument */
146			static int need; /* scanner - need to advance to next argument */
147			static char sc_token; / scanner - token buffer */
148			static size_t sc_len; /* scanner - length of token buffer */
149			static int sc_tokid; /* scanner - token id */
150			static int sc_tokplur; /* scanner - is token plural? */
151
152			/*
153			* parse a token, checking if it's something special to us
154			*/
155			static int
156			parse_token(char *arg)
157			{
158			int i;
159
160			for (i=0; i < sizeof(Specials) / sizeof(Specials[0]); i++) {
161			if (strcasecmp(Specials[i].name, arg) == 0) {
162			sc_tokplur = Specials[i].plural;
163			return (sc_tokid = Specials[i].value);
164			}
165			}
166
167			/* not special - must be some random id */
168			return (ID);
169			}
170
171
172			/*
173			* init_scanner() sets up the scanner to eat arguments
174			*/
175			static int
176			init_scanner(int argc, char **argv)
177			{
178			scp = argv;
179			scc = argc;
180			need = 1;
181			sc_len = 1;
182			while (argc-- > 0)
183			sc_len += strlen(*argv++);
184
185			if ((sc_token = malloc(sc_len)) == NULL) {
186			warn(NULL);
187			return (-1);
188			}
189			return (0);
190			}
191
192			/*
193			* token() fetches a token from the input stream
194			*/
195			static int
196			token(void)
197			{
198			int idx;
199
200			for (;;) {
201			bzero(sc_token, sc_len);
202			sc_tokid = EOF;
203			sc_tokplur = 0;
204			idx = 0;
205
206			/*
207			* if we need to read another argument, walk along the
208			* argument list; when we fall off the arglist, we'll
209			* just return EOF forever
210			*/
211			if (need) {
212			if (scc < 1)
213			return (sc_tokid);
214			sct = *scp;
215			scp++;
216			scc--;
217			need = 0;
218			}
219			/*
220			* eat whitespace now - if we walk off the end of the argument,
221			* we'll continue, which puts us up at the top of the while loop
222			* to fetch the next argument in
223			*/
224			while (isspace((unsigned char)*sct))
225			++sct;
226			if (!*sct) {
227			need = 1;
228			continue;
229			}
230
231			/*
232			* preserve the first character of the new token
233			*/
234			sc_token[0] = *sct++;
235
236			/*
237			* then see what it is
238			*/
239			if (isdigit((unsigned char)sc_token[0])) {
240			while (isdigit((unsigned char)*sct))
241			sc_token[++idx] = *sct++;
242			sc_token[++idx] = 0;
243			return ((sc_tokid = NUMBER));
244			} else if (isalpha((unsigned char)sc_token[0])) {
245			while (isalpha((unsigned char)*sct))
246			sc_token[++idx] = *sct++;
247			sc_token[++idx] = 0;
248			return (parse_token(sc_token));
249			}
250			else if (sc_token[0] == ':' \|\| sc_token[0] == '.')
251			return ((sc_tokid = DOT));
252			else if (sc_token[0] == '+')
253			return ((sc_tokid = PLUS));
254			else if (sc_token[0] == '/')
255			return ((sc_tokid = SLASH));
256			else
257			return ((sc_tokid = JUNK));
258			}
259			}
260
261
262			/*
263			* plonk() gives an appropriate error message if a token is incorrect
264			*/
265			static void
266			plonk(int tok)
267			{
268			warnx("%s time", (tok == EOF) ? "incomplete" : "garbled");
269			}
270
271
272			/*
273			* expect() gets a token and returns -1 if it's not the token we want
274			*/
275			static int
276			expect(int desired)
277			{
278			if (token() != desired) {
279			plonk(sc_tokid);
280			return (-1);
281			}
282			return (0);
283			}
284
285
286			/*
287			* dateadd() adds a number of minutes to a date. It is extraordinarily
288			* stupid regarding day-of-month overflow, and will most likely not
289			* work properly
290			*/
291			static void
292			dateadd(int minutes, struct tm *tm)
293			{
294			/* increment days */
295
296			while (minutes > 24*60) {
297			minutes -= 24*60;
298			tm->tm_mday++;
299			}
300
301			/* increment hours */
302			while (minutes > 60) {
303			minutes -= 60;
304			tm->tm_hour++;
305			if (tm->tm_hour > 23) {
306			tm->tm_mday++;
307			tm->tm_hour = 0;
308			}
309			}
310
311			/* increment minutes */
312			tm->tm_min += minutes;
313
314			if (tm->tm_min > 59) {
315			tm->tm_hour++;
316			tm->tm_min -= 60;
317
318			if (tm->tm_hour > 23) {
319			tm->tm_mday++;
320			tm->tm_hour = 0;
321			}
322			}
323			}
324
325
326			/*
327			* plus() parses a now + time
328			*
329			* at [NOW] PLUS NUMBER [MINUTES\|HOURS\|DAYS\|WEEKS\|MONTHS\|YEARS]
330			*
331			*/
332			static int
333			plus(struct tm *tm)
334			{
335			int increment;
336			int expectplur;
337
338			if (sc_tokid == NEXT) {
339			increment = 1;
340			expectplur = 0;
341			} else {
342			if (expect(NUMBER) != 0)
343			return (-1);
344			increment = atoi(sc_token);
345			expectplur = (increment != 1) ? 1 : 0;
346			}
347
348			switch (token()) {
349			case YEARS:
350			tm->tm_year += increment;
351			return (0);
352			case MONTHS:
353			tm->tm_mon += increment;
354			while (tm->tm_mon >= 12) {
355			tm->tm_year++;
356			tm->tm_mon -= 12;
357			}
358			return (0);
359			case WEEKS:
360			increment *= 7;
361			/* FALLTHROUGH */
362			case DAYS:
363			increment *= 24;
364			/* FALLTHROUGH */
365			case HOURS:
366			increment *= 60;
367			/* FALLTHROUGH */
368			case MINUTES:
369			if (expectplur != sc_tokplur)
370			warnx("pluralization is wrong");
371			dateadd(increment, tm);
372			return (0);
373			}
374
375			plonk(sc_tokid);
376			return (-1);
377			}
378
379
380			/*
381			* tod() computes the time of day
382			* [NUMBER [DOT NUMBER] [AM\|PM]]
383			*/
384			static int
385			tod(struct tm *tm)
386			{
387			int hour, minute = 0;
388			size_t tlen;
389
390			hour = atoi(sc_token);
391			tlen = strlen(sc_token);
392
393			/*
394			* first pick out the time of day - if it's 4 digits, we assume
395			* a HHMM time, otherwise it's HH DOT MM time
396			*/
397			if (token() == DOT) {
398			if (expect(NUMBER) != 0)
399			return (-1);
400			minute = atoi(sc_token);
401			if (minute > 59)
402			goto bad;
403			token();
404			} else if (tlen == 4) {
405			minute = hour % 100;
406			if (minute > 59)
407			goto bad;
408			hour = hour / 100;
409			}
410
411			/*
412			* check if an AM or PM specifier was given
413			*/
414			if (sc_tokid == AM \|\| sc_tokid == PM) {
415			if (hour > 12)
416			goto bad;
417
418			if (sc_tokid == PM) {
419			if (hour != 12) /* 12:xx PM is 12:xx, not 24:xx */
420			hour += 12;
421			} else {
422			if (hour == 12) /* 12:xx AM is 00:xx, not 12:xx */
423			hour = 0;
424			}
425			token();
426			} else if (hour > 23)
427			goto bad;
428
429			/*
430			* if we specify an absolute time, we don't want to bump the day even
431			* if we've gone past that time - but if we're specifying a time plus
432			* a relative offset, it's okay to bump things
433			*/
434			if ((sc_tokid == EOF \|\| sc_tokid == PLUS \|\| sc_tokid == NEXT) &&
435			tm->tm_hour > hour) {
436			tm->tm_mday++;
437			tm->tm_wday++;
438			}
439
440			tm->tm_hour = hour;
441			tm->tm_min = minute;
442			if (tm->tm_hour == 24) {
443			tm->tm_hour = 0;
444			tm->tm_mday++;
445			}
446			return (0);
447			bad:
448			warnx("garbled time");
449			return (-1);
450			}
451
452
453			/*
454			* assign_date() assigns a date, wrapping to next year if needed
455			*/
456			static void
457			assign_date(struct tm *tm, int mday, int mon, int year)
458			{
459
460			/*
461			* Convert year into tm_year format (year - 1900).
462			* We may be given the year in 2 digit, 4 digit, or tm_year format.
463			*/
464			if (year != -1) {
465			if (year >= 1900)
466			year -= 1900; /* convert from 4 digit year */
467			else if (year < 100) {
468			/* Convert to tm_year assuming current century */
469			year += (tm->tm_year / 100) * 100;
470
471			if (year == tm->tm_year - 1)
472			year++; /* Common off by one error */
473			else if (year < tm->tm_year)
474			year += 100; /* must be in next century */
475			}
476			}
477
478			if (year < 0 &&
479			(tm->tm_mon > mon \|\|(tm->tm_mon == mon && tm->tm_mday > mday)))
480			year = tm->tm_year + 1;
481
482			tm->tm_mday = mday;
483			tm->tm_mon = mon;
484
485			if (year >= 0)
486			tm->tm_year = year;
487			}
488
489
490			/*
491			* month() picks apart a month specification
492			*
493			* /[<month> NUMBER [NUMBER]] \
494			* \|[TOMORROW] \|
495			* \|[DAY OF WEEK] \|
496			* \|NUMBER [SLASH NUMBER [SLASH NUMBER]]\|
497			* \PLUS NUMBER MINUTES\|HOURS\|DAYS\|WEEKS\|MONTHS\|YEARS/
498			*/
499			static int
500			month(struct tm *tm)
501			{
502			int year = (-1);
503			int mday, wday, mon;
504			size_t tlen;
505
506			switch (sc_tokid) {
507			case NEXT:
508			case PLUS:
509			if (plus(tm) != 0)
510			return (-1);
511			break;
512
513			case TOMORROW:
514			/* do something tomorrow */
515			tm->tm_mday++;
516			tm->tm_wday++;
517			case TODAY:
518			/* force ourselves to stay in today - no further processing */
519			token();
520			break;
521
522			case JAN: case FEB: case MAR: case APR: case MAY: case JUN:
523			case JUL: case AUG: case SEP: case OCT: case NOV: case DEC:
524			/*
525			* do month mday [year]
526			*/
527			mon = sc_tokid - JAN;
528			if (expect(NUMBER) != 0)
529			return (-1);
530			mday = atoi(sc_token);
531			if (token() == NUMBER) {
532			year = atoi(sc_token);
533			token();
534			}
535			assign_date(tm, mday, mon, year);
536			break;
537
538			case SUN: case MON: case TUE:
539			case WED: case THU: case FRI:
540			case SAT:
541			/* do a particular day of the week */
542			wday = sc_tokid - SUN;
543
544			mday = tm->tm_mday;
545
546			/* if this day is < today, then roll to next week */
547			if (wday < tm->tm_wday)
548			mday += 7 - (tm->tm_wday - wday);
549			else
550			mday += (wday - tm->tm_wday);
551
552			tm->tm_wday = wday;
553
554			assign_date(tm, mday, tm->tm_mon, tm->tm_year);
555			break;
556
557			case NUMBER:
558			/*
559			* get numeric MMDDYY, mm/dd/yy, or dd.mm.yy
560			*/
561			tlen = strlen(sc_token);
562			mon = atoi(sc_token);
563			token();
564
565			if (sc_tokid == SLASH \|\| sc_tokid == DOT) {
566			int sep;
567
568			sep = sc_tokid;
569			if (expect(NUMBER) != 0)
570			return (-1);
571			mday = atoi(sc_token);
572			if (token() == sep) {
573			if (expect(NUMBER) != 0)
574			return (-1);
575			year = atoi(sc_token);
576			token();
577			}
578
579			/*
580			* flip months and days for european timing
581			*/
582			if (sep == DOT) {
583			int x = mday;
584			mday = mon;
585			mon = x;
586			}
587			} else if (tlen == 6 \|\| tlen == 8) {
588			if (tlen == 8) {
589			year = (mon % 10000) - 1900;
590			mon /= 10000;
591			} else {
592			year = mon % 100;
593			mon /= 100;
594			}
595			mday = mon % 100;
596			mon /= 100;
597			} else
598			goto bad;
599
600			mon--;
601			if (mon < 0 \|\| mon > 11 \|\| mday < 1 \|\| mday > 31)
602			goto bad;
603
604			assign_date(tm, mday, mon, year);
605			break;
606			}
607			return (0);
608			bad:
609			warnx("garbled time");
610			return (-1);
611			}
612
613
614			time_t
615			parsetime(int argc, char **argv)
616			{
617			/*
618			* Do the argument parsing, die if necessary, and return the
619			* time the job should be run.
620			*/
621			time_t nowtimer, runtimer;
622			struct tm nowtime, runtime;
623			int hr = 0;
624			/* this MUST be initialized to zero for midnight/noon/teatime */
625
626			if (argc == 0)
627			return (-1);
628
629			nowtimer = time(NULL);
630			nowtime = *localtime(&nowtimer);
631
632			runtime = nowtime;
633			runtime.tm_sec = 0;
634			runtime.tm_isdst = 0;
635
636			if (init_scanner(argc, argv) == -1)
637			return (-1);
638
639			switch (token()) {
640			case NOW: /* now is optional prefix for PLUS tree */
641			token();
642			if (sc_tokid == EOF) {
643			runtime = nowtime;
644			break;
645			}
646			else if (sc_tokid != PLUS && sc_tokid != NEXT)
647			plonk(sc_tokid);
648			case NEXT:
649			case PLUS:
650			if (plus(&runtime) != 0)
651			return (-1);
652			break;
653
654			case NUMBER:
655			if (tod(&runtime) != 0 \|\| month(&runtime) != 0)
656			return (-1);
657			break;
658
659			/*
660			* evil coding for TEATIME\|NOON\|MIDNIGHT - we've initialised
661			* hr to zero up above, then fall into this case in such a
662			* way so we add +12 +4 hours to it for teatime, +12 hours
663			* to it for noon, and nothing at all for midnight, then
664			* set our runtime to that hour before leaping into the
665			* month scanner
666			*/
667			case TEATIME:
668			hr += 4;
669			/* FALLTHROUGH */
670			case NOON:
671			hr += 12;
672			/* FALLTHROUGH */
673			case MIDNIGHT:
674			if (runtime.tm_hour >= hr) {
675			runtime.tm_mday++;
676			runtime.tm_wday++;
677			}
678			runtime.tm_hour = hr;
679			runtime.tm_min = 0;
680			token();
681			/* fall through to month setting */
682			/* FALLTHROUGH */
683			default:
684			if (month(&runtime) != 0)
685			return (-1);
686			break;
687			} /* ugly case statement */
688			if (expect(EOF) != 0)
689			return (-1);
690
691			/*
692			* adjust for daylight savings time
693			*/
694			runtime.tm_isdst = -1;
695			runtimer = mktime(&runtime);
696
697			if (runtimer < 0) {
698			warnx("garbled time");
699			return (-1);
700			}
701
702			if (nowtimer > runtimer) {
703			warnx("cannot schedule jobs in the past");
704			return (-1);
705			}
706
707			return (runtimer);
708			}