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For open/openat, if the flags parameter does not contain O_CREAT, the
3rd (variadic) mode_t parameter is irrelevant.  Many developers in the past
have passed mode_t (0, 044, 0644, or such), which might lead future people
to copy this broken idiom, and perhaps even believe this parameter has some
meaning or implication or application. Delete them all.
This comes out of a conversation where tb@ noticed that a strange (but
intentional) pledge behaviour is to always knock-out high-bits from
mode_t on a number of system calls as a safety factor, and his bewilderment
that this appeared to be happening against valid modes (at least visually),
but no sorry, they are all irrelevant junk.  They could all be 0xdeafbeef.
ok millert

/*	$OpenBSD: io.c,v 1.50 2021/10/24 21:24:16 deraadt 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.UTF-8") ||
			    !strcmp(buf + 5, "uk_UA.UTF-8") ||
			    !strcmp(buf + 5, "by_BY.UTF-8")) {
				bodun_maybe++;
				bodun = 0;
				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++;
			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++;
					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;
		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) {
			const char *errstr;

			switch (*start) {
			case '-':
			case '+':
				var = strtonum(start + 1, 0, 365, &errstr);
				if (errstr)
					return (0); /* Someone is just being silly */
				if (*start == '-')
					var = -var;
				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) == -1) {
		close(fdin);
		return (NULL);
	}
	switch (vfork()) {
	case -1:			/* error */
		(void)close(pdes[0]);
		(void)close(pdes[1]);
		close(fdin);
		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);
			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];
	pid_t pid = -1;

	if (!doall)
		return;

	(void)rewind(fp);
	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
		goto done;
	if (pipe(pdes) == -1)
		goto done;
	switch ((pid = 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);
	if (pid != -1) {
		while (waitpid(pid, &status, 0) == -1) {
			if (errno != EINTR)
				break;
		}
	}
}


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;
	}
}