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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/calendar/day.c	Lines:	274	318	86.2 %
Date:	2017-11-07	Branches:	160	227	70.5 %


/*	$OpenBSD: day.c,v 1.34 2016/09/14 15:09:46 millert Exp $	*/

/*
 * Copyright (c) 1989, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#include <sys/types.h>
#include <sys/uio.h>

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

#include "pathnames.h"
#include "calendar.h"

extern struct iovec header[];

#define WEEKLY 1
#define MONTHLY 2
#define YEARLY 3

struct tm *tp;
int *cumdays, offset;
char dayname[10];
enum calendars calendar;
u_long julian;


/* 1-based month, 0-based days, cumulative */
int daytab[][14] = {
	{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
	{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
};

static char *days[] = {
	"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
};

static char *months[] = {
	"jan", "feb", "mar", "apr", "may", "jun",
	"jul", "aug", "sep", "oct", "nov", "dec", NULL,
};

static struct fixs fndays[8];         /* full national days names */
static struct fixs ndays[8];          /* short national days names */

static struct fixs fnmonths[13];      /* full national months names */
static struct fixs nmonths[13];       /* short national month names */

void
fill_print_date(struct match *m, struct tm *tm)
{
	if (strftime(m->print_date, sizeof(m->print_date),
	    daynames ? "%a %b %d" : "%b %d", tm) == 0)
		m->print_date[sizeof(m->print_date) - 1] = '\0';
}

void
setnnames(void)
{
	char buf[80];
	int i, l;
	struct tm tm;

	for (i = 0; i < 7; i++) {
		tm.tm_wday = i;
		l = strftime(buf, sizeof(buf), "%a", &tm);
		for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
			;
		buf[l] = '\0';
		free(ndays[i].name);
		if ((ndays[i].name = strdup(buf)) == NULL)
			err(1, NULL);
		ndays[i].len = strlen(buf);

		l = strftime(buf, sizeof(buf), "%A", &tm);
		for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
			;
		buf[l] = '\0';
		free(fndays[i].name);
		if ((fndays[i].name = strdup(buf)) == NULL)
			err(1, NULL);
		fndays[i].len = strlen(buf);
	}

	for (i = 0; i < 12; i++) {
		tm.tm_mon = i;
		l = strftime(buf, sizeof(buf), "%b", &tm);
		for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
			;
		buf[l] = '\0';
		free(nmonths[i].name);
		if ((nmonths[i].name = strdup(buf)) == NULL)
			err(1, NULL);
		nmonths[i].len = strlen(buf);

		l = strftime(buf, sizeof(buf), "%B", &tm);
		for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
			;
		buf[l] = '\0';
		free(fnmonths[i].name);
		if ((fnmonths[i].name = strdup(buf)) == NULL)
			err(1, NULL);
		fnmonths[i].len = strlen(buf);
	}
	/* Hardwired special events */
	spev[0].name = strdup(PESACH);
	spev[0].nlen = PESACHLEN;
	spev[0].getev = pesach;
	spev[1].name = strdup(EASTER);
	spev[1].nlen = EASTERNAMELEN;
	spev[1].getev = easter;
	spev[2].name = strdup(PASKHA);
	spev[2].nlen = PASKHALEN;
	spev[2].getev = paskha;
	for (i = 0; i < NUMEV; i++) {
		if (spev[i].name == NULL)
			err(1, NULL);
		spev[i].uname = NULL;
	}
}

void
settime(time_t *now)
{
	tp = localtime(now);
	tp->tm_sec = 0;
	tp->tm_min = 0;
	/* Avoid getting caught by a timezone shift; set time to noon */
	tp->tm_isdst = 0;
	tp->tm_hour = 12;
	*now = mktime(tp);
	if (isleap(tp->tm_year + 1900))
		cumdays = daytab[1];
	else
		cumdays = daytab[0];
	/* Friday displays Monday's events */
	offset = tp->tm_wday == 5 ? 3 : 1;
	if (f_SetdayAfter)
		offset = 0;	/* Except not when range is set explicitly */
	header[5].iov_base = dayname;

	(void) setlocale(LC_TIME, "C");
	header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
	(void) setlocale(LC_TIME, "");

	setnnames();
}

/* convert [Year][Month]Day into unix time (since 1970)
 * Year: two or four digits, Month: two digits, Day: two digits
 */
time_t
Mktime(char *date)
{
	time_t t;
	int len;
	struct tm tm;

	(void)time(&t);
	tp = localtime(&t);

	len = strlen(date);
	if (len < 2)
		return((time_t)-1);
	bzero(&tm, sizeof tm);
	tm.tm_sec = 0;
	tm.tm_min = 0;
	/* Avoid getting caught by a timezone shift; set time to noon */
	tm.tm_isdst = 0;
	tm.tm_hour = 12;
	tm.tm_wday = 0;
	tm.tm_mday = tp->tm_mday;
	tm.tm_mon = tp->tm_mon;
	tm.tm_year = tp->tm_year;

	/* Day */
	tm.tm_mday = atoi(date + len - 2);

	/* Month */
	if (len >= 4) {
		*(date + len - 2) = '\0';
		tm.tm_mon = atoi(date + len - 4) - 1;
	}

	/* Year */
	if (len >= 6) {
		*(date + len - 4) = '\0';
		tm.tm_year = atoi(date);

		if (tm.tm_year < 69)		/* Y2K */
			tm.tm_year += 100;
		else if (tm.tm_year > 1900)
			tm.tm_year -= 1900;
	}

#if DEBUG
	printf("Mktime: %d %lld %d %s\n", (int)mktime(&tm), (long long)t, len,
	    asctime(&tm));
#endif
	return(mktime(&tm));
}

static void
adjust_calendar(int *day, int *month)
{
	switch (calendar) {
	case GREGORIAN:
		break;

	case JULIAN:
		*day += julian;
		if (*day > (cumdays[*month + 1] - cumdays[*month])) {
			*day -= (cumdays[*month + 1] - cumdays[*month]);
			if (++*month > 12)
				*month = 1;
		}
		break;
	case LUNAR:
		break;
	}
}

/*
 * Possible date formats include any combination of:
 *	3-charmonth			(January, Jan, Jan)
 *	3-charweekday			(Friday, Monday, mon.)
 *	numeric month or day		(1, 2, 04)
 *
 * Any character except \t or '*' may separate them, or they may not be
 * separated.  Any line following a line that is matched, that starts
 * with \t, is shown along with the matched line.
 */
struct match *
isnow(char *endp, int bodun)
{
	int day = 0, flags = 0, month = 0, v1, v2, i;
	int monthp, dayp, varp = 0;
	struct match *matches = NULL, *tmp, *tmp2;
	int interval = YEARLY;	/* how frequently the event repeats. */
	int vwd = 0;	/* Variable weekday */
	time_t tdiff, ttmp;
	struct tm tmtmp;

	/*
	 * CONVENTION
	 *
	 * Month:     1-12
	 * Monthname: Jan .. Dec
	 * Day:       1-31
	 * Weekday:   Mon-Sun
	 *
	 */

	/* read first field */
	/* didn't recognize anything, skip it */
	if (!(v1 = getfield(endp, &endp, &flags)))
		return (NULL);

	/* adjust bodun rate */
	if (bodun && !bodun_always)
		bodun = !arc4random_uniform(3);

	/* Easter or Easter depending days */
	if (flags & F_SPECIAL)
		vwd = v1;

	 /*
	  * 1. {Weekday,Day} XYZ ...
	  *
	  *    where Day is > 12
	  */
	else if (flags & F_ISDAY || v1 > 12) {

		/* found a day; day: 13-31 or weekday: 1-7 */
		day = v1;

		/* {Day,Weekday} {Month,Monthname} ... */
		/* if no recognizable month, assume just a day alone -- this is
		 * very unlikely and can only happen after the first 12 days.
		 * --find month or use current month */
		if (!(month = getfield(endp, &endp, &flags))) {
			month = tp->tm_mon + 1;
			/* F_ISDAY is set only if a weekday was spelled out */
			/* F_ISDAY must be set if 0 < day < 8 */
			if ((day <= 7) && (day >= 1))
				interval = WEEKLY;
			else
				interval = MONTHLY;
		} else if ((day <= 7) && (day >= 1))
			day += 10;
			/* it's a weekday; make it the first one of the month */
		if (month == -1) {
			month = tp->tm_mon + 1;
			interval = MONTHLY;
		} else if (calendar)
			adjust_calendar(&day, &month);
		if ((month > 12) || (month < 1))
			return (NULL);
	}

	/* 2. {Monthname} XYZ ... */
	else if (flags & F_ISMONTH) {
		month = v1;
		if (month == -1) {
			month = tp->tm_mon + 1;
			interval = MONTHLY;
		}
		/* Monthname {day,weekday} */
		/* if no recognizable day, assume the first day in month */
		if (!(day = getfield(endp, &endp, &flags)))
			day = 1;
		/* If a weekday was spelled out without an ordering,
		 * assume the first of that day in the month */
		if ((flags & F_ISDAY)) {
			if ((day >= 1) && (day <=7))
				day += 10;
		} else if (calendar)
			adjust_calendar(&day, &month);
	}

	/* Hm ... */
	else {
		v2 = getfield(endp, &endp, &flags);

		/*
		 * {Day} {Monthname} ...
		 * where Day <= 12
		 */
		if (flags & F_ISMONTH) {
			day = v1;
			month = v2;
			if (month == -1) {
				month = tp->tm_mon + 1;
				interval = MONTHLY;
			} else if (calendar)
				adjust_calendar(&day, &month);
		}

		/* {Month} {Weekday,Day} ...  */
		else {
			/* F_ISDAY set, v2 > 12, or no way to tell */
			month = v1;
			/* if no recognizable day, assume the first */
			day = v2 ? v2 : 1;
			if ((flags & F_ISDAY)) {
				if ((day >= 1) && (day <= 7))
					day += 10;
			} else
				adjust_calendar(&day, &month);
		}
	}

	/* convert Weekday into *next*  Day,
	 * e.g.: 'Sunday' -> 22
	 *       'SundayLast' -> ??
	 */
	if (flags & F_ISDAY) {
#if DEBUG
		fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
#endif

		varp = 1;
		/* variable weekday, SundayLast, MondayFirst ... */
		if (day < 0 || day >= 10)
			vwd = day;
		else {
			day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
			interval = WEEKLY;
		}
	} else
	/* Check for silliness.  Note we still catch Feb 29 */
		if (!(flags & F_SPECIAL) &&
		    (day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
			if (!((month == 2 && day == 29) ||
			    (interval == MONTHLY && day <= 31)))
				return (NULL);
		}

	if (!(flags & F_SPECIAL)) {
		monthp = month;
		dayp = day;
		day = cumdays[month] + day;
#if DEBUG
		fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
#endif
	/* Speed up processing for the most common situation:  yearly events
	 * when the interval being checked is less than a month or so (this
	 * could be less than a year, but then we have to start worrying about
	 * leap years).  Only one event can match, and it's easy to find.
	 * Note we can't check special events, because they can wander widely.
	 */
		if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
			memcpy(&tmtmp, tp, sizeof(struct tm));
			tmtmp.tm_mday = dayp;
			tmtmp.tm_mon = monthp - 1;
			if (vwd) {
			/* We want the event next year if it's late now
			 * this year.  The 50-day limit means we don't have to
			 * worry if next year is or isn't a leap year.
			 */
				if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
					variable_weekday(&vwd, tmtmp.tm_mon + 1,
					    tmtmp.tm_year + 1900 + 1);
				else
					variable_weekday(&vwd, tmtmp.tm_mon + 1,
					    tmtmp.tm_year + 1900);
				day = cumdays[tmtmp.tm_mon + 1] + vwd;
				tmtmp.tm_mday = vwd;
			}
			v2 = day - tp->tm_yday;
			if ((v2 > v1) || (v2 < 0)) {
				if ((v2 += isleap(tp->tm_year + 1900) ? 366 : 365)
				    <= v1)
					tmtmp.tm_year++;
				else if(!bodun || (day - tp->tm_yday) != -1)
					return(NULL);
			}
			if ((tmp = malloc(sizeof(struct match))) == NULL)
				err(1, NULL);

			if (bodun && (day - tp->tm_yday) == -1) {
				tmp->when = f_time - 1 * SECSPERDAY;
				tmtmp.tm_mday++;
				tmp->bodun = 1;
			} else {
				tmp->when = f_time + v2 * SECSPERDAY;
				tmp->bodun = 0;
			}

			(void)mktime(&tmtmp);
			fill_print_date(tmp, &tmtmp);
			tmp->var   = varp;
			tmp->next  = NULL;
			return(tmp);
		}
	} else {
		varp = 1;
		/* Set up v1 to the event number and ... */
		v1 = vwd % (NUMEV + 1) - 1;
		vwd /= (NUMEV + 1);
		if (v1 < 0) {
			v1 += NUMEV + 1;
			vwd--;
		}
		dayp = monthp = 1;	/* Why not */
	}

	/* Compare to past and coming instances of the event.  The i == 0 part
	 * of the loop corresponds to this specific instance.  Note that we
	 * can leave things sort of higgledy-piggledy since a mktime() happens
	 * on this before anything gets printed.  Also note that even though
	 * we've effectively gotten rid of f_dayBefore, we still have to check
	 * the one prior event for situations like "the 31st of every month"
	 * and "yearly" events which could happen twice in one year but not in
	 * the next */
	tmp2 = matches;
	for (i = -1; i < 2; i++) {
		memcpy(&tmtmp, tp, sizeof(struct tm));
		tmtmp.tm_mday = dayp;
		tmtmp.tm_mon = month = monthp - 1;
		do {
			v2 = 0;
			switch (interval) {
			case WEEKLY:
				tmtmp.tm_mday += 7 * i;
				break;
			case MONTHLY:
				month += i;
				tmtmp.tm_mon = month;
				switch(tmtmp.tm_mon) {
				case -1:
					tmtmp.tm_mon = month = 11;
					tmtmp.tm_year--;
					break;
				case 12:
					tmtmp.tm_mon = month = 0;
					tmtmp.tm_year++;
					break;
				}
				if (vwd) {
					v1 = vwd;
					variable_weekday(&v1, tmtmp.tm_mon + 1,
					    tmtmp.tm_year + 1900);
					tmtmp.tm_mday = v1;
				} else
					tmtmp.tm_mday = dayp;
				break;
			case YEARLY:
			default:
				tmtmp.tm_year += i;
				if (flags & F_SPECIAL) {
					tmtmp.tm_mon = 0;	/* Gee, mktime() is nice */
					tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
					    1900) + vwd;
				} else if (vwd) {
					v1 = vwd;
					variable_weekday(&v1, tmtmp.tm_mon + 1,
					    tmtmp.tm_year + 1900);
					tmtmp.tm_mday = v1;
				} else {
				/* Need the following to keep Feb 29 from
				 * becoming Mar 1 */
				tmtmp.tm_mday = dayp;
				tmtmp.tm_mon = monthp - 1;
				}
				break;
			}
			/* How many days apart are we */
			if ((ttmp = mktime(&tmtmp)) == -1)
				warnx("time out of range: %s", endp);
			else {
				tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
				if (tdiff <= offset + f_dayAfter ||
				    (bodun && tdiff == -1)) {
					if (((tmtmp.tm_mon == month) ||
					     (flags & F_SPECIAL) ||
					     (interval == WEEKLY)) &&
					    (tdiff >=  0 ||
					    (bodun && tdiff == -1))) {
					if ((tmp = malloc(sizeof(struct match))) == NULL)
						err(1, NULL);
					tmp->when = ttmp;
					fill_print_date(tmp, &tmtmp);
					tmp->bodun = bodun && tdiff == -1;
					tmp->var   = varp;
					tmp->next  = NULL;
					if (tmp2)
						tmp2->next = tmp;
					else
						matches = tmp;
					tmp2 = tmp;
					v2 = (i == 1) ? 1 : 0;
					}
				} else
					i = 2; /* No point checking in the future */
			}
		} while (v2 != 0);
	}
	return (matches);
}


int
getmonth(char *s)
{
	char **p;
	struct fixs *n;

	for (n = fnmonths; n->name; ++n)
		if (!strncasecmp(s, n->name, n->len))
			return ((n - fnmonths) + 1);
	for (n = nmonths; n->name; ++n)
		if (!strncasecmp(s, n->name, n->len))
			return ((n - nmonths) + 1);
	for (p = months; *p; ++p)
		if (!strncasecmp(s, *p, 3))
			return ((p - months) + 1);
	return (0);
}


int
getday(char *s)
{
	char **p;
	struct fixs *n;

	for (n = fndays; n->name; ++n)
		if (!strncasecmp(s, n->name, n->len))
			return ((n - fndays) + 1);
	for (n = ndays; n->name; ++n)
		if (!strncasecmp(s, n->name, n->len))
			return ((n - ndays) + 1);
	for (p = days; *p; ++p)
		if (!strncasecmp(s, *p, 3))
			return ((p - days) + 1);
	return (0);
}

/* return offset for variable weekdays
 * -1 -> last weekday in month
 * +1 -> first weekday in month
 * ... etc ...
 */
int
getdayvar(char *s)
{
	int offset;


	offset = strlen(s);

	/* Sun+1 or Wednesday-2
	 *    ^              ^   */

	/* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
	switch(*(s + offset - 2)) {
	case '-':
	case '+':
	    return(atoi(s + offset - 2));
	    break;
	}

	/*
	 * some aliases: last, first, second, third, fourth
	 */

	/* last */
	if      (offset > 4 && !strcasecmp(s + offset - 4, "last"))
	    return(-1);
	else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
	    return(+1);
	else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
	    return(+2);
	else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
	    return(+3);
	else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
	    return(+4);

	/* no offset detected */
	return(0);
}


int
foy(int year)
{
	/* 0-6; what weekday Jan 1 is */
	year--;
	return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
}



void
variable_weekday(int *day, int month, int year)
{
	int v1, v2;
	int *cumdays;
	int day1;

	if (isleap(year))
		cumdays = daytab[1];
	else
		cumdays = daytab[0];
	day1 = foy(year);
	/* negative offset; last, -4 .. -1 */
	if (*day < 0) {
		v1 = *day/10 - 1;          /* offset -4 ... -1 */
		*day = 10 + (*day % 10);    /* day 1 ... 7 */

		/* which weekday the end of the month is (1-7) */
		v2 = (cumdays[month + 1] + day1) % 7 + 1;

		/* and subtract enough days */
		*day = cumdays[month + 1] - cumdays[month] +
		    (v1 + 1) * 7 - (v2 - *day + 7) % 7;
#if DEBUG
		fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
#endif
	}

	/* first, second ... +1 ... +5 */
	else {
		v1 = *day/10;        /* offset */
		*day = *day % 10;

		/* which weekday the first of the month is (1-7) */
		v2 = (cumdays[month] + 1 + day1) % 7 + 1;

		/* and add enough days */
		*day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
#if DEBUG
		fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
#endif
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: day.c,v 1.34 2016/09/14 15:09:46 millert Exp $ */
2
3			/*
4			* Copyright (c) 1989, 1993, 1994
5			* The Regents of the University of California. All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			* 3. Neither the name of the University nor the names of its contributors
16			* may be used to endorse or promote products derived from this software
17			* without specific prior written permission.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29			* SUCH DAMAGE.
30			*/
31
32			#include <sys/types.h>
33			#include <sys/uio.h>
34
35			#include <ctype.h>
36			#include <err.h>
37			#include <locale.h>
38			#include <stdio.h>
39			#include <stdlib.h>
40			#include <string.h>
41			#include <time.h>
42
43			#include "pathnames.h"
44			#include "calendar.h"
45
46			extern struct iovec header[];
47
48			#define WEEKLY 1
49			#define MONTHLY 2
50			#define YEARLY 3
51
52			struct tm *tp;
53			int *cumdays, offset;
54			char dayname[10];
55			enum calendars calendar;
56			u_long julian;
57
58
59			/* 1-based month, 0-based days, cumulative */
60			int daytab[][14] = {
61			{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
62			{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
63			};
64
65			static char *days[] = {
66			"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
67			};
68
69			static char *months[] = {
70			"jan", "feb", "mar", "apr", "may", "jun",
71			"jul", "aug", "sep", "oct", "nov", "dec", NULL,
72			};
73
74			static struct fixs fndays[8]; /* full national days names */
75			static struct fixs ndays[8]; /* short national days names */
76
77			static struct fixs fnmonths[13]; /* full national months names */
78			static struct fixs nmonths[13]; /* short national month names */
79
80			void
81			fill_print_date(struct match m, struct tm tm)
82			{
83	✗✓	712728	if (strftime(m->print_date, sizeof(m->print_date),
84		356364	daynames ? "%a %b %d" : "%b %d", tm) == 0)
85			m->print_date[sizeof(m->print_date) - 1] = '\0';
86		178182	}
87
88			void
89			setnnames(void)
90			{
91		13160	char buf[80];
92			int i, l;
93		6580	struct tm tm;
94
95	✓✓	105280	for (i = 0; i < 7; i++) {
96		46060	tm.tm_wday = i;
97		46060	l = strftime(buf, sizeof(buf), "%a", &tm);
98	✓✗✗✓	138180	for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
99			;
100		46060	buf[l] = '\0';
101		46060	free(ndays[i].name);
102	✗✓	46060	if ((ndays[i].name = strdup(buf)) == NULL)
103			err(1, NULL);
104		46060	ndays[i].len = strlen(buf);
105
106		46060	l = strftime(buf, sizeof(buf), "%A", &tm);
107	✓✗✗✓	138180	for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
108			;
109		46060	buf[l] = '\0';
110		46060	free(fndays[i].name);
111	✗✓	46060	if ((fndays[i].name = strdup(buf)) == NULL)
112			err(1, NULL);
113		46060	fndays[i].len = strlen(buf);
114			}
115
116	✓✓	171080	for (i = 0; i < 12; i++) {
117		78960	tm.tm_mon = i;
118		78960	l = strftime(buf, sizeof(buf), "%b", &tm);
119	✓✗✗✓	236880	for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
120			;
121		78960	buf[l] = '\0';
122		78960	free(nmonths[i].name);
123	✗✓	78960	if ((nmonths[i].name = strdup(buf)) == NULL)
124			err(1, NULL);
125		78960	nmonths[i].len = strlen(buf);
126
127		78960	l = strftime(buf, sizeof(buf), "%B", &tm);
128	✓✗✗✓	236880	for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
129			;
130		78960	buf[l] = '\0';
131		78960	free(fnmonths[i].name);
132	✗✓	78960	if ((fnmonths[i].name = strdup(buf)) == NULL)
133			err(1, NULL);
134		78960	fnmonths[i].len = strlen(buf);
135			}
136			/* Hardwired special events */
137		6580	spev[0].name = strdup(PESACH);
138		6580	spev[0].nlen = PESACHLEN;
139		6580	spev[0].getev = pesach;
140		6580	spev[1].name = strdup(EASTER);
141		6580	spev[1].nlen = EASTERNAMELEN;
142		6580	spev[1].getev = easter;
143		6580	spev[2].name = strdup(PASKHA);
144		6580	spev[2].nlen = PASKHALEN;
145		6580	spev[2].getev = paskha;
146	✓✓	52640	for (i = 0; i < NUMEV; i++) {
147	✗✓	19740	if (spev[i].name == NULL)
148			err(1, NULL);
149		19740	spev[i].uname = NULL;
150			}
151		6580	}
152
153			void
154			settime(time_t *now)
155			{
156		13160	tp = localtime(now);
157		6580	tp->tm_sec = 0;
158		6580	tp->tm_min = 0;
159			/* Avoid getting caught by a timezone shift; set time to noon */
160		6580	tp->tm_isdst = 0;
161		6580	tp->tm_hour = 12;
162		6580	*now = mktime(tp);
163	✓✓✗✓ ✗✗	9874	if (isleap(tp->tm_year + 1900))
164		3294	cumdays = daytab[1];
165			else
166			cumdays = daytab[0];
167			/* Friday displays Monday's events */
168		6580	offset = tp->tm_wday == 5 ? 3 : 1;
169		6580	if (f_SetdayAfter)
170		6580	offset = 0; /* Except not when range is set explicitly */
171		6580	header[5].iov_base = dayname;
172
173		6580	(void) setlocale(LC_TIME, "C");
174		6580	header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
175		6580	(void) setlocale(LC_TIME, "");
176
177		6580	setnnames();
178		6580	}
179
180			/* convert [Year][Month]Day into unix time (since 1970)
181			* Year: two or four digits, Month: two digits, Day: two digits
182			*/
183			time_t
184			Mktime(char *date)
185			{
186		13158	time_t t;
187			int len;
188		6579	struct tm tm;
189
190		6579	(void)time(&t);
191		6579	tp = localtime(&t);
192
193		6579	len = strlen(date);
194	✗✓	6579	if (len < 2)
195			return((time_t)-1);
196		6579	bzero(&tm, sizeof tm);
197		6579	tm.tm_sec = 0;
198		6579	tm.tm_min = 0;
199			/* Avoid getting caught by a timezone shift; set time to noon */
200		6579	tm.tm_isdst = 0;
201		6579	tm.tm_hour = 12;
202		6579	tm.tm_wday = 0;
203		6579	tm.tm_mday = tp->tm_mday;
204		6579	tm.tm_mon = tp->tm_mon;
205		6579	tm.tm_year = tp->tm_year;
206
207			/* Day */
208		6579	tm.tm_mday = atoi(date + len - 2);
209
210			/* Month */
211	✓✗	6579	if (len >= 4) {
212		6579	*(date + len - 2) = '\0';
213		6579	tm.tm_mon = atoi(date + len - 4) - 1;
214		6579	}
215
216			/* Year */
217	✓✗	6579	if (len >= 6) {
218		6579	*(date + len - 4) = '\0';
219		6579	tm.tm_year = atoi(date);
220
221	✗✓	6579	if (tm.tm_year < 69) /* Y2K */
222			tm.tm_year += 100;
223	✓✗	6579	else if (tm.tm_year > 1900)
224		6579	tm.tm_year -= 1900;
225			}
226
227			#if DEBUG
228			printf("Mktime: %d %lld %d %s\n", (int)mktime(&tm), (long long)t, len,
229			asctime(&tm));
230			#endif
231		6579	return(mktime(&tm));
232		6579	}
233
234			static void
235			adjust_calendar(int day, int month)
236			{
237	✗✓	4013190	switch (calendar) {
238			case GREGORIAN:
239			break;
240
241			case JULIAN:
242			*day += julian;
243			if (day > (cumdays[month + 1] - cumdays[*month])) {
244			day -= (cumdays[month + 1] - cumdays[*month]);
245			if (++*month > 12)
246			*month = 1;
247			}
248			break;
249			case LUNAR:
250			break;
251			}
252		2006595	}
253
254			/*
255			* Possible date formats include any combination of:
256			* 3-charmonth (January, Jan, Jan)
257			* 3-charweekday (Friday, Monday, mon.)
258			* numeric month or day (1, 2, 04)
259			*
260			* Any character except \t or '*' may separate them, or they may not be
261			* separated. Any line following a line that is matched, that starts
262			* with \t, is shown along with the matched line.
263			*/
264			struct match *
265			isnow(char *endp, int bodun)
266			{
267		15493545	int day = 0, flags = 0, month = 0, v1, v2, i;
268			int monthp, dayp, varp = 0;
269			struct match matches = NULL, tmp, *tmp2;
270			int interval = YEARLY; /* how frequently the event repeats. */
271		15493545	int vwd = 0; /* Variable weekday */
272			time_t tdiff, ttmp;
273		15493545	struct tm tmtmp;
274
275			/*
276			* CONVENTION
277			*
278			* Month: 1-12
279			* Monthname: Jan .. Dec
280			* Day: 1-31
281			* Weekday: Mon-Sun
282			*
283			*/
284
285			/* read first field */
286			/* didn't recognize anything, skip it */
287	✗✓	15493545	if (!(v1 = getfield(endp, &endp, &flags)))
288			return (NULL);
289
290			/* adjust bodun rate */
291	✗✓	15493545	if (bodun && !bodun_always)
292			bodun = !arc4random_uniform(3);
293
294			/* Easter or Easter depending days */
295	✓✓	15493545	if (flags & F_SPECIAL)
296		19737	vwd = v1;
297
298			/*
299			* 1. {Weekday,Day} XYZ ...
300			*
301			* where Day is > 12
302			*/
303	✓✓	15473808	else if (flags & F_ISDAY \|\| v1 > 12) {
304
305			/* found a day; day: 13-31 or weekday: 1-7 */
306		2217123	day = v1;
307
308			/* {Day,Weekday} {Month,Monthname} ... */
309			/* if no recognizable month, assume just a day alone -- this is
310			* very unlikely and can only happen after the first 12 days.
311			* --find month or use current month */
312	✓✓	2217123	if (!(month = getfield(endp, &endp, &flags))) {
313		875007	month = tp->tm_mon + 1;
314			/* F_ISDAY is set only if a weekday was spelled out */
315			/* F_ISDAY must be set if 0 < day < 8 */
316	✓✓	875007	if ((day <= 7) && (day >= 1))
317		46053	interval = WEEKLY;
318			else
319			interval = MONTHLY;
320	✗✓	1342116	} else if ((day <= 7) && (day >= 1))
321			day += 10;
322			/* it's a weekday; make it the first one of the month */
323	✓✓	2217123	if (month == -1) {
324		125001	month = tp->tm_mon + 1;
325			interval = MONTHLY;
326	✗✓	2217123	} else if (calendar)
327			adjust_calendar(&day, &month);
328	✗✓	2217123	if ((month > 12) \|\| (month < 1))
329			return (NULL);
330			}
331
332			/* 2. {Monthname} XYZ ... */
333	✓✓	13256685	else if (flags & F_ISMONTH) {
334		4855302	month = v1;
335	✓✓	4855302	if (month == -1) {
336		6579	month = tp->tm_mon + 1;
337			interval = MONTHLY;
338		6579	}
339			/* Monthname {day,weekday} */
340			/* if no recognizable day, assume the first day in month */
341		4855302	if (!(day = getfield(endp, &endp, &flags)))
342		4855302	day = 1;
343			/* If a weekday was spelled out without an ordering,
344			* assume the first of that day in the month */
345	✓✓	4855302	if ((flags & F_ISDAY)) {
346	✗✓	2763180	if ((day >= 1) && (day <=7))
347			day += 10;
348	✗✓	2092122	} else if (calendar)
349			adjust_calendar(&day, &month);
350			}
351
352			/* Hm ... */
353			else {
354		8401383	v2 = getfield(endp, &endp, &flags);
355
356			/*
357			* {Day} {Monthname} ...
358			* where Day <= 12
359			*/
360	✓✓	8401383	if (flags & F_ISMONTH) {
361		868428	day = v1;
362		868428	month = v2;
363	✓✓	868428	if (month == -1) {
364		78948	month = tp->tm_mon + 1;
365			interval = MONTHLY;
366	✗✓	868428	} else if (calendar)
367			adjust_calendar(&day, &month);
368			}
369
370			/* {Month} {Weekday,Day} ... */
371			else {
372			/* F_ISDAY set, v2 > 12, or no way to tell */
373		7532955	month = v1;
374			/* if no recognizable day, assume the first */
375		7532955	day = v2 ? v2 : 1;
376	✓✓	7532955	if ((flags & F_ISDAY)) {
377	✗✓	5526360	if ((day >= 1) && (day <= 7))
378			day += 10;
379			} else
380		2006595	adjust_calendar(&day, &month);
381			}
382			}
383
384			/* convert Weekday into next Day,
385			* e.g.: 'Sunday' -> 22
386			* 'SundayLast' -> ??
387			*/
388	✓✓	15493545	if (flags & F_ISDAY) {
389			#if DEBUG
390			fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
391			#endif
392
393			varp = 1;
394			/* variable weekday, SundayLast, MondayFirst ... */
395	✓✓	9164547	if (day < 0 \|\| day >= 10)
396		9118494	vwd = day;
397			else {
398		46053	day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
399			interval = WEEKLY;
400			}
401			} else
402			/* Check for silliness. Note we still catch Feb 29 */
403	✓✓	6328998	if (!(flags & F_SPECIAL) &&
404	✓✓	6309261	(day > (cumdays[month + 1] - cumdays[month]) \|\| day < 1)) {
405	✓✓	13293	if (!((month == 2 && day == 29) \|\|
406	✗✓	3186	(interval == MONTHLY && day <= 31)))
407			return (NULL);
408			}
409
410	✓✓	15493545	if (!(flags & F_SPECIAL)) {
411		15473808	monthp = month;
412		15473808	dayp = day;
413		15473808	day = cumdays[month] + day;
414			#if DEBUG
415			fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
416			#endif
417			/* Speed up processing for the most common situation: yearly events
418			* when the interval being checked is less than a month or so (this
419			* could be less than a year, but then we have to start worrying about
420			* leap years). Only one event can match, and it's easy to find.
421			* Note we can't check special events, because they can wander widely.
422			*/
423	✓✓	15473808	if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
424		14388273	memcpy(&tmtmp, tp, sizeof(struct tm));
425		14388273	tmtmp.tm_mday = dayp;
426		14388273	tmtmp.tm_mon = monthp - 1;
427	✓✓	14388273	if (vwd) {
428			/* We want the event next year if it's late now
429			* this year. The 50-day limit means we don't have to
430			* worry if next year is or isn't a leap year.
431			*/
432	✓✓✓✓	9752400	if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
433		243810	variable_weekday(&vwd, tmtmp.tm_mon + 1,
434		243810	tmtmp.tm_year + 1900 + 1);
435			else
436		16091460	variable_weekday(&vwd, tmtmp.tm_mon + 1,
437		8045730	tmtmp.tm_year + 1900);
438		8289540	day = cumdays[tmtmp.tm_mon + 1] + vwd;
439		8289540	tmtmp.tm_mday = vwd;
440		8289540	}
441		14388273	v2 = day - tp->tm_yday;
442	✓✓	14388273	if ((v2 > v1) \|\| (v2 < 0)) {
443	✓✓✗✓ ✓✓	50055876	if ((v2 += isleap(tp->tm_year + 1900) ? 366 : 365)
444		14298876	<= v1)
445		306	tmtmp.tm_year++;
446	✗✓✗✗	14298570	else if(!bodun \|\| (day - tp->tm_yday) != -1)
447		14298570	return(NULL);
448			}
449	✗✓	89703	if ((tmp = malloc(sizeof(struct match))) == NULL)
450			err(1, NULL);
451
452	✗✓✗✗	89703	if (bodun && (day - tp->tm_yday) == -1) {
453			tmp->when = f_time - 1 * SECSPERDAY;
454			tmtmp.tm_mday++;
455			tmp->bodun = 1;
456			} else {
457		89703	tmp->when = f_time + v2 * SECSPERDAY;
458			tmp->bodun = 0;
459			}
460
461		89703	(void)mktime(&tmtmp);
462		89703	fill_print_date(tmp, &tmtmp);
463		89703	tmp->var = varp;
464		89703	tmp->next = NULL;
465		89703	return(tmp);
466			}
467			} else {
468			varp = 1;
469			/* Set up v1 to the event number and ... */
470		19737	v1 = vwd % (NUMEV + 1) - 1;
471		19737	vwd /= (NUMEV + 1);
472	✓✓	19737	if (v1 < 0) {
473		6579	v1 += NUMEV + 1;
474		6579	vwd--;
475		6579	}
476			dayp = monthp = 1; /* Why not */
477			}
478
479			/* Compare to past and coming instances of the event. The i == 0 part
480			* of the loop corresponds to this specific instance. Note that we
481			* can leave things sort of higgledy-piggledy since a mktime() happens
482			* on this before anything gets printed. Also note that even though
483			* we've effectively gotten rid of f_dayBefore, we still have to check
484			* the one prior event for situations like "the 31st of every month"
485			* and "yearly" events which could happen twice in one year but not in
486			* the next */
487			tmp2 = matches;
488	✓✓	7753536	for (i = -1; i < 2; i++) {
489		2771496	memcpy(&tmtmp, tp, sizeof(struct tm));
490		2771496	tmtmp.tm_mday = dayp;
491		2771496	tmtmp.tm_mon = month = monthp - 1;
492		2771496	do {
493			v2 = 0;
494	✓✓✓	2772891	switch (interval) {
495			case WEEKLY:
496		107154	tmtmp.tm_mday += 7 * i;
497		107154	break;
498			case MONTHLY:
499		2745531	month += i;
500		2745531	tmtmp.tm_mon = month;
501	✓✓✓	2745531	switch(tmtmp.tm_mon) {
502			case -1:
503		88164	tmtmp.tm_mon = month = 11;
504			tmtmp.tm_year--;
505		88164	break;
506			case 12:
507		45495	tmtmp.tm_mon = month = 0;
508			tmtmp.tm_year++;
509		45495	break;
510			}
511	✓✓	2745531	if (vwd) {
512		2071836	v1 = vwd;
513		4143672	variable_weekday(&v1, tmtmp.tm_mon + 1,
514		2071836	tmtmp.tm_year + 1900);
515		2071836	tmtmp.tm_mday = v1;
516		2071836	} else
517			tmtmp.tm_mday = dayp;
518		2611872	break;
519			case YEARLY:
520			default:
521		53865	tmtmp.tm_year += i;
522	✓✗	53865	if (flags & F_SPECIAL) {
523		53865	tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
524		107730	tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
525		53865	1900) + vwd;
526	✗✗	53865	} else if (vwd) {
527			v1 = vwd;
528			variable_weekday(&v1, tmtmp.tm_mon + 1,
529			tmtmp.tm_year + 1900);
530			tmtmp.tm_mday = v1;
531			} else {
532			/* Need the following to keep Feb 29 from
533			* becoming Mar 1 */
534			tmtmp.tm_mday = dayp;
535			tmtmp.tm_mon = monthp - 1;
536			}
537			break;
538			}
539			/* How many days apart are we */
540	✗✓	2772891	if ((ttmp = mktime(&tmtmp)) == -1)
541			warnx("time out of range: %s", endp);
542			else {
543		2772891	tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
544	✓✓	2772891	if (tdiff <= offset + f_dayAfter \|\|
545	✗✓	1105272	(bodun && tdiff == -1)) {
546	✓✓	1667619	if (((tmtmp.tm_mon == month) \|\|
547	✓✓	206226	(flags & F_SPECIAL) \|\|
548		103113	(interval == WEEKLY)) &&
549	✓✓	1605042	(tdiff >= 0 \|\|
550	✗✓	1516563	(bodun && tdiff == -1))) {
551	✗✓	88479	if ((tmp = malloc(sizeof(struct match))) == NULL)
552			err(1, NULL);
553		88479	tmp->when = ttmp;
554		88479	fill_print_date(tmp, &tmtmp);
555		88479	tmp->bodun = bodun && tdiff == -1;
556		88479	tmp->var = varp;
557		88479	tmp->next = NULL;
558	✗✓	88479	if (tmp2)
559			tmp2->next = tmp;
560			else
561			matches = tmp;
562			tmp2 = tmp;
563		88479	v2 = (i == 1) ? 1 : 0;
564		88479	}
565			} else
566			i = 2; /* No point checking in the future */
567			}
568	✓✓	2772891	} while (v2 != 0);
569			}
570		1105272	return (matches);
571		15493545	}
572
573
574			int
575			getmonth(char *s)
576			{
577			char **p;
578			struct fixs *n;
579
580	✓✓	423411282	for (n = fnmonths; n->name; ++n)
581	✓✓	188725194	if (!strncasecmp(s, n->name, n->len))
582		2519757	return ((n - fnmonths) + 1);
583	✓✓	319897296	for (n = nmonths; n->name; ++n)
584	✓✓	149803830	if (!strncasecmp(s, n->name, n->len))
585		4335561	return ((n - nmonths) + 1);
586	✓✓	263765268	for (p = months; *p; ++p)
587	✗✓	121737816	if (!strncasecmp(s, *p, 3))
588			return ((p - months) + 1);
589		10144818	return (0);
590		17000136	}
591
592
593			int
594			getday(char *s)
595			{
596			char **p;
597			struct fixs *n;
598
599	✓✓	124566786	for (n = fndays; n->name; ++n)
600	✓✓	53053056	if (!strncasecmp(s, n->name, n->len))
601		5986890	return ((n - fndays) + 1);
602	✓✓	41105592	for (n = ndays; n->name; ++n)
603	✓✓	19572525	if (!strncasecmp(s, n->name, n->len))
604		3177657	return ((n - ndays) + 1);
605	✓✓	15684336	for (p = days; *p; ++p)
606	✗✓	6861897	if (!strncasecmp(s, *p, 3))
607			return ((p - days) + 1);
608		980271	return (0);
609		10144818	}
610
611			/* return offset for variable weekdays
612			* -1 -> last weekday in month
613			* +1 -> first weekday in month
614			* ... etc ...
615			*/
616			int
617			getdayvar(char *s)
618			{
619			int offset;
620
621
622		18329094	offset = strlen(s);
623
624			/* Sun+1 or Wednesday-2
625			* ^ ^ */
626
627			/* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
628	✗✓✓	9164547	switch(*(s + offset - 2)) {
629			case '-':
630			case '+':
631		9118494	return(atoi(s + offset - 2));
632			break;
633			}
634
635			/*
636			* some aliases: last, first, second, third, fourth
637			*/
638
639			/* last */
640	✓✗✗✓	92106	if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
641			return(-1);
642	✓✗✗✓	92106	else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
643			return(+1);
644	✓✓✗✓	72369	else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
645			return(+2);
646	✓✗✗✓	92106	else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
647			return(+3);
648	✓✓✗✓	72369	else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
649			return(+4);
650
651			/* no offset detected */
652		46053	return(0);
653		9164547	}
654
655
656			int
657			foy(int year)
658			{
659			/* 0-6; what weekday Jan 1 is */
660		20722752	year--;
661		10361376	return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
662			}
663
664
665
666			void
667			variable_weekday(int *day, int month, int year)
668			{
669			int v1, v2;
670			int *cumdays;
671			int day1;
672
673	✓✓✗✓ ✗✗	25770060	if (isleap(year))
674		5047308	cumdays = daytab[1];
675			else
676			cumdays = daytab[0];
677		10361376	day1 = foy(year);
678			/* negative offset; last, -4 .. -1 */
679	✓✓	10361376	if (*day < 0) {
680		927792	v1 = day/10 - 1; / offset -4 ... -1 */
681		927792	day = 10 + (day % 10); /* day 1 ... 7 */
682
683			/* which weekday the end of the month is (1-7) */
684		927792	v2 = (cumdays[month + 1] + day1) % 7 + 1;
685
686			/* and subtract enough days */
687		2783376	*day = cumdays[month + 1] - cumdays[month] +
688		1855584	(v1 + 1) * 7 - (v2 - *day + 7) % 7;
689			#if DEBUG
690			fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
691			#endif
692		927792	}
693
694			/* first, second ... +1 ... +5 */
695			else {
696			v1 = day/10; / offset */
697		9433584	day = day % 10;
698
699			/* which weekday the first of the month is (1-7) */
700		9433584	v2 = (cumdays[month] + 1 + day1) % 7 + 1;
701
702			/* and add enough days */
703		9433584	day = 1 + (v1 - 1) 7 + (*day - v2 + 7) % 7;
704			#if DEBUG
705			fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
706			#endif
707			}
708		10361376	}