4.4BSD/usr/src/usr.bin/calendar/calendar.c
/*
* Copyright (c) 1989, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)calendar.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <pwd.h>
#include <errno.h>
#include <tzfile.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <string.h>
#include "pathnames.h"
extern int errno;
struct passwd *pw;
int doall;
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
int ch;
while ((ch = getopt(argc, argv, "-a")) != EOF)
switch(ch) {
case '-': /* backward contemptible */
case 'a':
if (getuid()) {
(void)fprintf(stderr,
"calendar: %s\n", strerror(EPERM));
exit(1);
}
doall = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc)
usage();
settime();
if (doall)
while (pw = getpwent()) {
(void)setegid(pw->pw_gid);
(void)seteuid(pw->pw_uid);
if (!chdir(pw->pw_dir))
cal();
(void)seteuid(0);
}
else
cal();
exit(0);
}
cal()
{
register int printing;
register char *p;
FILE *fp, *opencal();
int ch;
char buf[2048 + 1];
if (!(fp = opencal()))
return;
for (printing = 0; fgets(buf, sizeof(buf), stdin);) {
if (p = index(buf, '\n'))
*p = '\0';
else
while ((ch = getchar()) != '\n' && ch != EOF);
if (buf[0] == '\0')
continue;
if (buf[0] != '\t')
printing = isnow(buf) ? 1 : 0;
if (printing)
(void)fprintf(fp, "%s\n", buf);
}
closecal(fp);
}
struct iovec header[] = {
"From: ", 6,
NULL, 0,
" (Reminder Service)\nTo: ", 24,
NULL, 0,
"\nSubject: ", 10,
NULL, 0,
"'s Calendar\nPrecedence: bulk\n\n", 30,
};
/* 1-based month, 0-based days, cumulative */
int daytab[][14] = {
0, 0, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364,
0, 0, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365,
};
struct tm *tp;
int *cumdays, offset, yrdays;
char dayname[10];
settime()
{
time_t now, time();
(void)time(&now);
tp = localtime(&now);
if (isleap(tp->tm_year + 1900)) {
yrdays = DAYSPERLYEAR;
cumdays = daytab[1];
} else {
yrdays = DAYSPERNYEAR;
cumdays = daytab[0];
}
/* Friday displays Monday's events */
offset = tp->tm_wday == 5 ? 3 : 1;
header[5].iov_base = dayname;
header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
}
/*
* 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 may separate them, or they may not be separated. Any line,
* following a line that is matched, that starts with "whitespace", is shown
* along with the matched line.
*/
isnow(endp)
char *endp;
{
int day, flags, month, v1, v2;
#define F_ISMONTH 0x01
#define F_ISDAY 0x02
flags = 0;
/* didn't recognize anything, skip it */
if (!(v1 = getfield(endp, &endp, &flags)))
return(0);
if (flags&F_ISDAY || v1 > 12) {
/* found a day */
day = v1;
/* if no recognizable month, assume just a day alone */
if (!(month = getfield(endp, &endp, &flags)))
month = tp->tm_mon + 1;
} else if (flags&F_ISMONTH) {
month = v1;
/* if no recognizable day, assume the first */
if (!(day = getfield(endp, &endp, &flags)))
day = 1;
} else {
v2 = getfield(endp, &endp, &flags);
if (flags&F_ISMONTH) {
day = v1;
month = v2;
} else {
/* F_ISDAY set, v2 > 12, or no way to tell */
month = v1;
/* if no recognizable day, assume the first */
day = v2 ? v2 : 1;
}
}
/* ASSUME THIS SHIT WORKS... %^&%&^%^& */
day = cumdays[month] + day;
/* if today or today + offset days */
if (day >= tp->tm_yday && day <= tp->tm_yday + offset)
return(1);
/* if number of days left in this year + days to event in next year */
if (yrdays - tp->tm_yday + day <= offset)
return(1);
return(0);
}
getfield(p, endp, flags)
char *p, **endp;
int *flags;
{
int val;
char *start, savech;
for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p)
;
if (*p == '*') { /* `*' is current month */
*flags |= F_ISMONTH;
*endp = p+1;
return(tp->tm_mon + 1);
}
if (isdigit(*p)) {
val = strtol(p, &p, 10); /* if 0, it's failure */
for (; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
*endp = p;
return(val);
}
for (start = p; isalpha(*++p););
savech = *p;
*p = '\0';
if (val = getmonth(start))
*flags |= F_ISMONTH;
else if (val = getday(start))
*flags |= F_ISDAY;
else
return(0);
for (*p = savech; !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p);
*endp = p;
return(val);
}
char path[MAXPATHLEN + 1];
FILE *
opencal()
{
int fd, pdes[2];
char *mktemp();
/* open up calendar file as stdin */
if (!freopen("calendar", "r", stdin)) {
if (doall)
return((FILE *)NULL);
(void)fprintf(stderr, "calendar: no calendar file.\n");
exit(1);
}
if (pipe(pdes) < 0)
return(NULL);
switch (vfork()) {
case -1: /* error */
(void)close(pdes[0]);
(void)close(pdes[1]);
return(NULL);
case 0:
/* child -- stdin already setup, set stdout to pipe input */
if (pdes[1] != STDOUT_FILENO) {
(void)dup2(pdes[1], STDOUT_FILENO);
(void)close(pdes[1]);
}
(void)close(pdes[0]);
execl(_PATH_CPP, "cpp", "-I.", _PATH_INCLUDE, NULL);
_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 */
(void)sprintf(path, "%s/_calXXXXXX", _PATH_TMP);
if ((fd = mkstemp(path)) < 0)
return(NULL);
return(fdopen(fd, "w+"));
}
closecal(fp)
FILE *fp;
{
struct stat sbuf;
int nread, pdes[2], status;
char buf[1024], *mktemp();
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\"", "-f", "root", NULL);
(void)fprintf(stderr, "calendar: %s: %s.\n",
_PATH_SENDMAIL, strerror(errno));
_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, 7);
while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
(void)write(pdes[1], buf, nread);
(void)close(pdes[1]);
done: (void)fclose(fp);
(void)unlink(path);
while (wait(&status) >= 0);
}
static char *months[] = {
"jan", "feb", "mar", "apr", "may", "jun",
"jul", "aug", "sep", "oct", "nov", "dec", NULL,
};
getmonth(s)
register char *s;
{
register char **p;
for (p = months; *p; ++p)
if (!strncasecmp(s, *p, 3))
return((p - months) + 1);
return(0);
}
static char *days[] = {
"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
};
getday(s)
register char *s;
{
register char **p;
for (p = days; *p; ++p)
if (!strncasecmp(s, *p, 3))
return((p - days) + 1);
return(0);
}
usage()
{
(void)fprintf(stderr, "usage: calendar [-a]\n");
exit(1);
}