io.c revision 15714 
1272343Sngie/*
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static const char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <stdio.h>
46#include <ctype.h>
47#include <sys/types.h>
48#include <sys/stat.h>
49#include <unistd.h>
50#include <err.h>
51#include <errno.h>
52#include <locale.h>
53#include <string.h>
54#include <sys/uio.h>
55#include <sys/time.h>
56#include <stdlib.h>
57#include <pwd.h>
58#include <sys/wait.h>
59
60#include "pathnames.h"
61#include "calendar.h"
62
63
64char *calendarFile = "calendar";  /* default calendar file */
65char *calendarHome = ".calendar"; /* HOME */
66char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
67
68struct iovec header[] = {
69	{"From: ", 6},
70	{NULL, 0},
71	{" (Reminder Service)\nTo: ", 24},
72	{NULL, 0},
73	{"\nSubject: ", 10},
74	{NULL, 0},
75	{"'s Calendar\nPrecedence: bulk\n\n",  30},
76};
77
78
79void
80cal()
81{
82	register int printing;
83	register char *p;
84	FILE *fp;
85	int ch, l;
86	int month;
87	int day;
88	int var;
89	char buf[2048 + 1];
90
91	if ((fp = opencal()) == NULL)
92		return;
93	for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
94		if ((p = strchr(buf, '\n')) != NULL)
95			*p = '\0';
96		else
97			while ((ch = getchar()) != '\n' && ch != EOF);
98		for (l = strlen(buf);
99		     l > 0 && isspace((unsigned char)buf[l - 1]);
100		     l--)
101			;
102		buf[l] = '\0';
103		if (buf[0] == '\0')
104			continue;
105		if (strncmp(buf, "LANG=", 5) == 0) {
106			(void) setlocale(LC_ALL, buf + 5);
107			setnnames();
108			continue;
109		}
110		if (buf[0] != '\t') {
111			printing = isnow(buf, &month, &day, &var) ? 1 : 0;
112			if ((p = strchr(buf, '\t')) == NULL)
113				continue;
114			if (p > buf && p[-1] == '*')
115				var = 1;
116			if (printing)
117				(void)fprintf(fp, "%.2d/%.2d%c%s\n", month,
118				    day, var ? '*' : ' ', p);
119		}
120		else if (printing)
121			fprintf(fp, "%s\n", buf);
122	}
123	closecal(fp);
124}
125
126int
127getfield(p, endp, flags)
128	char *p, **endp;
129	int *flags;
130{
131	int val, var;
132	char *start, savech;
133
134	for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
135	if (*p == '*') {			/* `*' is current month */
136		*flags |= F_ISMONTH;
137		*endp = p+1;
138		return (tp->tm_mon + 1);
139	}
140	if (isdigit((unsigned char)*p)) {
141		val = strtol(p, &p, 10);	/* if 0, it's failure */
142		for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
143		*endp = p;
144		return (val);
145	}
146	for (start = p; isalpha((unsigned char)*++p););
147
148	/* Sunday-1 */
149	if (*p == '+' || *p == '-')
150	    for(; isdigit((unsigned char)*++p););
151
152	savech = *p;
153	*p = '\0';
154
155	/* Month */
156	if ((val = getmonth(start)) != 0)
157		*flags |= F_ISMONTH;
158
159	/* Day */
160	else if ((val = getday(start)) != 0) {
161	    *flags |= F_ISDAY;
162
163	    /* variable weekday */
164	    if ((var = getdayvar(start)) != 0) {
165		if (var <=5 && var >= -4)
166		    val += var * 10;
167#ifdef DEBUG
168		printf("var: %d\n", var);
169#endif
170	    }
171	}
172
173	/* Easter */
174	else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
175	    *flags |= F_EASTER;
176
177	/* Paskha */
178	else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
179	    *flags |= F_EASTER;
180
181	/* undefined rest */
182	else {
183		*p = savech;
184		return (0);
185	}
186	for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
187	*endp = p;
188	return (val);
189}
190
191char path[MAXPATHLEN + 1];
192
193FILE *
194opencal()
195{
196	int fd, pdes[2];
197	struct stat sbuf;
198
199	/* open up calendar file as stdin */
200	if (!freopen(calendarFile, "r", stdin)) {
201		if (doall) {
202		    if (chdir(calendarHome) != 0)
203			return (NULL);
204		    if (stat(calendarNoMail, &sbuf) == 0)
205		        return (NULL);
206		    if (!freopen(calendarFile, "r", stdin))
207		        return (NULL);
208		} else {
209		        chdir(getenv("HOME"));
210			if (!(chdir(calendarHome) == 0 &&
211			      freopen(calendarFile, "r", stdin)))
212				errx(1, "no calendar file: ``%s'' or ``~/%s/%s\n", calendarFile, calendarHome, calendarFile);
213		}
214	}
215	if (pipe(pdes) < 0)
216		return (NULL);
217	switch (vfork()) {
218	case -1:			/* error */
219		(void)close(pdes[0]);
220		(void)close(pdes[1]);
221		return (NULL);
222	case 0:
223		/* child -- stdin already setup, set stdout to pipe input */
224		if (pdes[1] != STDOUT_FILENO) {
225			(void)dup2(pdes[1], STDOUT_FILENO);
226			(void)close(pdes[1]);
227		}
228		(void)close(pdes[0]);
229		execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL);
230		(void)fprintf(stderr,
231		    "calendar: execl: %s: %s.\n", _PATH_CPP, strerror(errno));
232		_exit(1);
233	}
234	/* parent -- set stdin to pipe output */
235	(void)dup2(pdes[0], STDIN_FILENO);
236	(void)close(pdes[0]);
237	(void)close(pdes[1]);
238
239	/* not reading all calendar files, just set output to stdout */
240	if (!doall)
241		return (stdout);
242
243	/* set output to a temporary file, so if no output don't send mail */
244	(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
245	if ((fd = mkstemp(path)) < 0)
246		return (NULL);
247	return (fdopen(fd, "w+"));
248}
249
250void
251closecal(fp)
252	FILE *fp;
253{
254	struct stat sbuf;
255	int nread, pdes[2], status;
256	char buf[1024];
257
258	if (!doall)
259		return;
260
261	(void)rewind(fp);
262	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
263		goto done;
264	if (pipe(pdes) < 0)
265		goto done;
266	switch (vfork()) {
267	case -1:			/* error */
268		(void)close(pdes[0]);
269		(void)close(pdes[1]);
270		goto done;
271	case 0:
272		/* child -- set stdin to pipe output */
273		if (pdes[0] != STDIN_FILENO) {
274			(void)dup2(pdes[0], STDIN_FILENO);
275			(void)close(pdes[0]);
276		}
277		(void)close(pdes[1]);
278		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
279		    "\"Reminder Service\"", "-f", "root", NULL);
280		(void)fprintf(stderr,
281		    "calendar: %s: %s.\n", _PATH_SENDMAIL, strerror(errno));
282		_exit(1);
283	}
284	/* parent -- write to pipe input */
285	(void)close(pdes[0]);
286
287	header[1].iov_base = header[3].iov_base = pw->pw_name;
288	header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
289	writev(pdes[1], header, 7);
290	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
291		(void)write(pdes[1], buf, nread);
292	(void)close(pdes[1]);
293done:	(void)fclose(fp);
294	(void)unlink(path);
295	while (wait(&status) >= 0);
296}
297
298