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tzfile.h is an internal header that should never have been installed.
What's worse, the tzfile.h that gets installed is over 20 years old
and doesn't match the real tzfile.h in libc/time.  This makes the
tree safe for /usr/include/tzfile.h removal.  The TM_YEAR_BASE
define has been moved to time.h temporarily until its usage is
replaced by 1900 in the tree.  Actual removal of tzfile.h is pending
a ports build.  Based on a diff from deraadt@

/*	$OpenBSD: io.c,v 1.38 2015/03/15 00:41:28 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/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

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


struct iovec header[] = {
	{ "From: ", 6 },
	{ NULL, 0 },
	{ " (Reminder Service)\nTo: ", 24 },
	{ NULL, 0 },
	{ "\nSubject: ", 10 },
	{ NULL, 0 },
	{ "'s Calendar\nPrecedence: bulk\n",  29 },
	{ "Auto-Submitted: auto-generated\n\n", 32 },
};


void
cal(void)
{
	int ch, l, i, bodun = 0, bodun_maybe = 0, var, printing;
	struct event *events, *cur_evt, *ev1, *tmp;
	char buf[2048 + 1], *prefix = NULL, *p;
	struct match *m;
	FILE *fp;

	events = NULL;
	cur_evt = NULL;
	if ((fp = opencal()) == NULL)
		return;
	for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
		if ((p = strchr(buf, '\n')) != NULL)
			*p = '\0';
		else
			while ((ch = getchar()) != '\n' && ch != EOF);
		for (l = strlen(buf); l > 0 && isspace(buf[l - 1]); l--)
			;
		buf[l] = '\0';
		if (buf[0] == '\0')
			continue;
		if (strncmp(buf, "LANG=", 5) == 0) {
			(void) setlocale(LC_ALL, buf + 5);
			setnnames();
			if (!strcmp(buf + 5, "ru_RU.KOI8-R") ||
			    !strcmp(buf + 5, "uk_UA.KOI8-U") ||
			    !strcmp(buf + 5, "by_BY.KOI8-B")) {
				bodun_maybe++;
				bodun = 0;
				if (prefix)
					free(prefix);
				prefix = NULL;
			} else
				bodun_maybe = 0;
			continue;
		} else if (strncmp(buf, "CALENDAR=", 9) == 0) {
			char *ep;

			if (buf[9] == '\0')
				calendar = 0;
			else if (!strcasecmp(buf + 9, "julian")) {
				calendar = JULIAN;
				errno = 0;
				julian = strtoul(buf + 14, &ep, 10);
				if (buf[0] == '\0' || *ep != '\0')
					julian = 13;
				if ((errno == ERANGE && julian == ULONG_MAX) ||
				    julian > 14)
					errx(1, "Julian calendar offset is too large");
			} else if (!strcasecmp(buf + 9, "gregorian"))
				calendar = GREGORIAN;
			else if (!strcasecmp(buf + 9, "lunar"))
				calendar = LUNAR;
		} else if (bodun_maybe && strncmp(buf, "BODUN=", 6) == 0) {
			bodun++;
			if (prefix)
				free(prefix);
			if ((prefix = strdup(buf + 6)) == NULL)
				err(1, NULL);
			continue;
		}
		/* User defined names for special events */
		if ((p = strchr(buf, '='))) {
			for (i = 0; i < NUMEV; i++) {
				if (strncasecmp(buf, spev[i].name,
				    spev[i].nlen) == 0 &&
				    (p - buf == spev[i].nlen) &&
				    buf[spev[i].nlen + 1]) {
					p++;
					if (spev[i].uname != NULL)
						free(spev[i].uname);
					if ((spev[i].uname = strdup(p)) == NULL)
						err(1, NULL);
					spev[i].ulen = strlen(p);
					i = NUMEV + 1;
				}
			}
			if (i > NUMEV)
				continue;
		}
		if (buf[0] != '\t') {
			printing = (m = isnow(buf, bodun)) ? 1 : 0;
			if ((p = strchr(buf, '\t')) == NULL) {
				printing = 0;
				continue;
			}
			/* Need the following to catch hardwired "variable"
			 * dates */
			if (p > buf && p[-1] == '*')
				var = 1;
			else
				var = 0;
			if (printing) {
				struct match *foo;
				
				ev1 = NULL;
				while (m) {
					cur_evt = malloc(sizeof(struct event));
					if (cur_evt == NULL)
						err(1, NULL);
	
					cur_evt->when = m->when;
					snprintf(cur_evt->print_date,
					    sizeof(cur_evt->print_date), "%s%c",
					    m->print_date, (var + m->var) ? '*' : ' ');
					if (ev1) {
						cur_evt->desc = ev1->desc;
						cur_evt->ldesc = NULL;
					} else {
						if (m->bodun && prefix) {
							if (asprintf(&cur_evt->ldesc,
							    "\t%s %s", prefix,
							    p + 1) == -1)
								err(1, NULL);
						} else if ((cur_evt->ldesc =
						    strdup(p)) == NULL)
							err(1, NULL);
						cur_evt->desc = &(cur_evt->ldesc);
						ev1 = cur_evt;
					}
					insert(&events, cur_evt);
					foo = m;
					m = m->next;
					free(foo);
				}
			}
		} else if (printing) {
			if (asprintf(&p, "%s\n%s", ev1->ldesc,
			    buf) == -1)
				err(1, NULL);
			free(ev1->ldesc);
			ev1->ldesc = p;
		}
	}
	tmp = events;
	while (tmp) {
		(void)fprintf(fp, "%s%s\n", tmp->print_date, *(tmp->desc));
		tmp = tmp->next;
	}
	tmp = events;
	while (tmp) {
		events = tmp;
		if (tmp->ldesc)
			free(tmp->ldesc);
		tmp = tmp->next;
		free(events);
	}
	closecal(fp);
}

int
getfield(char *p, char **endp, int *flags)
{
	int val, var, i;
	char *start, savech;

	for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) &&
	    *p != '*' && *p != '\t'; ++p)
		;
	if (*p == '*') {			/* `*' is every month */
		*flags |= F_ISMONTH;
		*endp = p+1;
		return (-1);	/* means 'every month' */
	}
	if (isdigit((unsigned char)*p)) {
		val = strtol(p, &p, 10);	/* if 0, it's failure */
		for (; !isdigit((unsigned char)*p) &&
		    !isalpha((unsigned char)*p) && *p != '*'; ++p)
			;
		*endp = p;
		return (val);
	}
	for (start = p; isalpha((unsigned char)*++p);)
		;

	/* Sunday-1 */
	if (*p == '+' || *p == '-')
		for(; isdigit((unsigned char)*++p); )
			;

	savech = *p;
	*p = '\0';

	/* Month */
	if ((val = getmonth(start)) != 0)
		*flags |= F_ISMONTH;

	/* Day */
	else if ((val = getday(start)) != 0) {
		*flags |= F_ISDAY;

		/* variable weekday */
		if ((var = getdayvar(start)) != 0) {
			if (var <= 5 && var >= -4)
				val += var * 10;
#ifdef DEBUG
			printf("var: %d\n", var);
#endif
		}
	}

	/* Try specials (Easter, Paskha, ...) */
	else {
		for (i = 0; i < NUMEV; i++) {
			if (strncasecmp(start, spev[i].name, spev[i].nlen) == 0) {
				start += spev[i].nlen;
				val = i + 1;
				i = NUMEV + 1;
			} else if (spev[i].uname != NULL &&
			    strncasecmp(start, spev[i].uname, spev[i].ulen) == 0) {
				start += spev[i].ulen;
				val = i + 1;
				i = NUMEV + 1;
			}
		}
		if (i > NUMEV) {
			switch(*start) {
			case '-':
			case '+':
				var = atoi(start);
				if (var > 365 || var < -365)
					return (0); /* Someone is just being silly */
				val += (NUMEV + 1) * var;
				/* We add one to the matching event and multiply by
				 * (NUMEV + 1) so as not to return 0 if there's a match.
				 * val will overflow if there is an obscenely large
				 * number of special events. */
				break;
			}
			*flags |= F_SPECIAL;	
		}
		if (!(*flags & F_SPECIAL)) {
			/* undefined rest */
			*p = savech;
			return (0);
		}
	}
	for (*p = savech; !isdigit((unsigned char)*p) &&
	    !isalpha((unsigned char)*p) && *p != '*' && *p != '\t'; ++p)
		;
	*endp = p;
	return (val);
}


FILE *
opencal(void)
{
	int pdes[2], fdin;
	struct stat st;

	/* open up calendar file as stdin */
	if ((fdin = open(calendarFile, O_RDONLY)) == -1 ||
	    fstat(fdin, &st) == -1 || !S_ISREG(st.st_mode)) {
		if (!doall) {
			char *home = getenv("HOME");
			if (home == NULL || *home == '\0')
				errx(1, "cannot get home directory");
			if (!(chdir(home) == 0 &&
			    chdir(calendarHome) == 0 &&
			    (fdin = open(calendarFile, O_RDONLY)) != -1))
				errx(1, "no calendar file: ``%s'' or ``~/%s/%s''",
				    calendarFile, calendarHome, calendarFile);
		}
	}

	if (pipe(pdes) < 0)
		return (NULL);
	switch (vfork()) {
	case -1:			/* error */
		(void)close(pdes[0]);
		(void)close(pdes[1]);
		return (NULL);
	case 0:
		dup2(fdin, STDIN_FILENO);
		/* child -- set stdout to pipe input */
		if (pdes[1] != STDOUT_FILENO) {
			(void)dup2(pdes[1], STDOUT_FILENO);
			(void)close(pdes[1]);
		}
		(void)close(pdes[0]);
		/* 
		 * Set stderr to /dev/null.  Necessary so that cron does not
		 * wait for cpp to finish if it's running calendar -a.
		 */
		if (doall) {
			int fderr;
			fderr = open(_PATH_DEVNULL, O_WRONLY, 0);
			if (fderr == -1)
				_exit(0);
			(void)dup2(fderr, STDERR_FILENO);
			(void)close(fderr);
		}
		execl(_PATH_CPP, "cpp", "-traditional", "-undef", "-U__GNUC__",
		    "-P", "-I.", _PATH_INCLUDE, (char *)NULL);
		warn(_PATH_CPP);
		_exit(1);
	}
	/* parent -- set stdin to pipe output */
	(void)dup2(pdes[0], STDIN_FILENO);
	(void)close(pdes[0]);
	(void)close(pdes[1]);

	/* not reading all calendar files, just set output to stdout */
	if (!doall)
		return (stdout);

	/* set output to a temporary file, so if no output don't send mail */
	return(tmpfile());
}

void
closecal(FILE *fp)
{
	struct stat sbuf;
	int nread, pdes[2], status;
	char buf[1024];

	if (!doall)
		return;

	(void)rewind(fp);
	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
		goto done;
	if (pipe(pdes) < 0)
		goto done;
	switch (vfork()) {
	case -1:			/* error */
		(void)close(pdes[0]);
		(void)close(pdes[1]);
		goto done;
	case 0:
		/* child -- set stdin to pipe output */
		if (pdes[0] != STDIN_FILENO) {
			(void)dup2(pdes[0], STDIN_FILENO);
			(void)close(pdes[0]);
		}
		(void)close(pdes[1]);
		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
		    "\"Reminder Service\"", (char *)NULL);
		warn(_PATH_SENDMAIL);
		_exit(1);
	}
	/* parent -- write to pipe input */
	(void)close(pdes[0]);

	header[1].iov_base = header[3].iov_base = pw->pw_name;
	header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
	writev(pdes[1], header, 8);
	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
		(void)write(pdes[1], buf, nread);
	(void)close(pdes[1]);
done:	(void)fclose(fp);
	while (wait(&status) >= 0)
		;
}


void
insert(struct event **head, struct event *cur_evt)
{
	struct event *tmp, *tmp2;

	if (*head) {
		/* Insert this one in order */
		tmp = *head;
		tmp2 = NULL;
		while (tmp->next &&
		    tmp->when <= cur_evt->when) {
			tmp2 = tmp;
			tmp = tmp->next;
		}
		if (tmp->when > cur_evt->when) {
			cur_evt->next = tmp;
			if (tmp2)
				tmp2->next = cur_evt;
			else
				*head = cur_evt;
		} else {
			cur_evt->next = tmp->next;
			tmp->next = cur_evt;
		}
	} else {
		*head = cur_evt;
		cur_evt->next = NULL;
	}
}