calendar.c revision 1.15
1 /* $NetBSD: calendar.c,v 1.15 1998/07/28 19:26:09 mycroft 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)calendar.c 8.4 (Berkeley) 1/7/95"; 45 #endif 46 __RCSID("$NetBSD: calendar.c,v 1.15 1998/07/28 19:26:09 mycroft Exp $"); 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/time.h> 51 #include <sys/stat.h> 52 #include <sys/uio.h> 53 #include <sys/wait.h> 54 55 #include <ctype.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <time.h> 64 #include <tzfile.h> 65 #include <unistd.h> 66 67 #include "pathnames.h" 68 69 #ifndef TRUE 70 #define TRUE 1 71 #endif 72 #ifndef FALSE 73 #define FALSE 0 74 #endif 75 76 unsigned short lookahead = 1, weekend = 2; 77 char *fname = "calendar", *datestr = NULL; 78 struct passwd *pw; 79 int doall; 80 81 extern char *__progname; 82 83 void atodays __P((char, char *, unsigned short *)); 84 void cal __P((void)); 85 void closecal __P((FILE *)); 86 int getday __P((char *)); 87 int getfield __P((char *, char **, int *)); 88 void getmmdd(struct tm *tp, char *ds); 89 int getmonth __P((char *)); 90 int isnow __P((char *)); 91 int main __P((int, char **)); 92 FILE *opencal __P((void)); 93 void settime __P((void)); 94 void usage __P((void)); 95 96 int 97 main(argc, argv) 98 int argc; 99 char *argv[]; 100 { 101 extern int optind; 102 int ch; 103 const char *caldir; 104 105 while ((ch = getopt(argc, argv, "-ad:f:l:w:")) != -1) 106 switch (ch) { 107 case '-': /* backward contemptible */ 108 case 'a': 109 if (getuid()) { 110 errno = EPERM; 111 err(1, "%s", ""); 112 } 113 doall = 1; 114 break; 115 case 'd': 116 datestr = optarg; 117 break; 118 case 'f': 119 fname = optarg; 120 break; 121 case 'l': 122 atodays(ch, optarg, &lookahead); 123 break; 124 case 'w': 125 atodays(ch, optarg, &weekend); 126 break; 127 case '?': 128 default: 129 usage(); 130 } 131 argc -= optind; 132 argv += optind; 133 134 if (argc) 135 usage(); 136 137 settime(); 138 if (doall) 139 while ((pw = getpwent()) != NULL) { 140 (void)setegid(pw->pw_gid); 141 (void)seteuid(pw->pw_uid); 142 if (!chdir(pw->pw_dir)) 143 cal(); 144 (void)seteuid(0); 145 } 146 else if ((caldir = getenv("CALENDAR_DIR")) != NULL) { 147 if(!chdir(caldir)) 148 cal(); 149 } else 150 cal(); 151 exit(0); 152 } 153 154 void 155 cal() 156 { 157 int printing; 158 char *p; 159 FILE *fp; 160 int ch; 161 char buf[2048 + 1]; 162 163 if ((fp = opencal()) == NULL) 164 return; 165 for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) { 166 if ((p = strchr(buf, '\n')) != NULL) 167 *p = '\0'; 168 else 169 while ((ch = getchar()) != '\n' && ch != EOF); 170 if (buf[0] == '\0') 171 continue; 172 if (buf[0] != '\t') 173 printing = isnow(buf) ? 1 : 0; 174 if (printing) 175 (void)fprintf(fp, "%s\n", buf); 176 } 177 closecal(fp); 178 } 179 180 struct iovec header[] = { 181 { "From: ", 6 }, 182 { NULL, 0 }, 183 { " (Reminder Service)\nTo: ", 24 }, 184 { NULL, 0 }, 185 { "\nSubject: ", 10 }, 186 { NULL, 0 }, 187 { "'s Calendar\nPrecedence: bulk\n\n", 30 }, 188 }; 189 190 /* 1-based month, 0-based days, cumulative */ 191 int daytab[][14] = { 192 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 193 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 194 }; 195 struct tm *tp; 196 int *cumdays, offset, yrdays; 197 char dayname[10]; 198 199 void 200 settime() 201 { 202 time_t now; 203 204 (void)time(&now); 205 tp = localtime(&now); 206 if (datestr) { 207 getmmdd(tp, datestr); 208 } 209 if (isleap(tp->tm_year + TM_YEAR_BASE)) { 210 yrdays = DAYSPERLYEAR; 211 cumdays = daytab[1]; 212 } else { 213 yrdays = DAYSPERNYEAR; 214 cumdays = daytab[0]; 215 } 216 /* Friday displays Monday's events */ 217 offset = tp->tm_wday == 5 ? lookahead + weekend : lookahead; 218 header[5].iov_base = dayname; 219 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 220 } 221 222 /* 223 * Possible date formats include any combination of: 224 * 3-charmonth (January, Jan, Jan) 225 * 3-charweekday (Friday, Monday, mon.) 226 * numeric month or day (1, 2, 04) 227 * 228 * Any character may separate them, or they may not be separated. Any line, 229 * following a line that is matched, that starts with "whitespace", is shown 230 * along with the matched line. 231 */ 232 int 233 isnow(endp) 234 char *endp; 235 { 236 int day, flags, month, v1, v2; 237 238 #define F_ISMONTH 0x01 239 #define F_ISDAY 0x02 240 flags = 0; 241 /* didn't recognize anything, skip it */ 242 if (!(v1 = getfield(endp, &endp, &flags))) 243 return (0); 244 if (flags & F_ISDAY || v1 > 12) { 245 /* found a day */ 246 day = v1; 247 month = tp->tm_mon + 1; 248 } else if (flags & F_ISMONTH) { 249 month = v1; 250 /* if no recognizable day, assume the first */ 251 if (!(day = getfield(endp, &endp, &flags))) 252 day = 1; 253 } else { 254 v2 = getfield(endp, &endp, &flags); 255 if (flags & F_ISMONTH) { 256 day = v1; 257 month = v2; 258 } else { 259 /* F_ISDAY set, v2 > 12, or no way to tell */ 260 month = v1; 261 /* if no recognizable day, assume the first */ 262 day = v2 ? v2 : 1; 263 } 264 } 265 if (flags & F_ISDAY) 266 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 267 day = cumdays[month] + day; 268 269 /* if today or today + offset days */ 270 if (day >= tp->tm_yday && day <= tp->tm_yday + offset) 271 return (1); 272 /* if number of days left in this year + days to event in next year */ 273 if (yrdays - tp->tm_yday + day <= offset) 274 return (1); 275 return (0); 276 } 277 278 int 279 getfield(p, endp, flags) 280 char *p, **endp; 281 int *flags; 282 { 283 int val; 284 char *start, savech; 285 286 for (; *p != '\0' && !isdigit(*p) && !isalpha(*p) && *p != '*'; ++p) 287 ; 288 if (*p == '*') { /* `*' is current month */ 289 *flags |= F_ISMONTH; 290 *endp = p+1; 291 return (tp->tm_mon + 1); 292 } 293 if (isdigit(*p)) { 294 val = strtol(p, &p, 10); /* if 0, it's failure */ 295 for (; *p != '\0' && !isdigit(*p) && !isalpha(*p) && *p != '*'; 296 ++p) 297 ; 298 *endp = p; 299 return (val); 300 } 301 for (start = p; *p != '\0' && isalpha(*++p);) 302 ; 303 savech = *p; 304 *p = '\0'; 305 if ((val = getmonth(start)) != 0) 306 *flags |= F_ISMONTH; 307 else if ((val = getday(start)) != 0) 308 *flags |= F_ISDAY; 309 else { 310 *p = savech; 311 return (0); 312 } 313 for (*p = savech; 314 *p != '\0' && !isdigit(*p) && !isalpha(*p) && *p != '*'; 315 ++p) 316 ; 317 *endp = p; 318 return (val); 319 } 320 321 char path[MAXPATHLEN + 1]; 322 323 FILE * 324 opencal() 325 { 326 int fd, pdes[2]; 327 328 /* open up calendar file as stdin */ 329 if (!freopen(fname, "r", stdin)) { 330 if (doall) 331 return (NULL); 332 errx(1, "no calendar file."); 333 } 334 if (pipe(pdes) < 0) 335 return (NULL); 336 switch (vfork()) { 337 case -1: /* error */ 338 (void)close(pdes[0]); 339 (void)close(pdes[1]); 340 return (NULL); 341 case 0: 342 /* child -- stdin already setup, set stdout to pipe input */ 343 if (pdes[1] != STDOUT_FILENO) { 344 (void)dup2(pdes[1], STDOUT_FILENO); 345 (void)close(pdes[1]); 346 } 347 (void)close(pdes[0]); 348 execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL); 349 warn("execl: %s", _PATH_CPP); 350 _exit(1); 351 } 352 /* parent -- set stdin to pipe output */ 353 (void)dup2(pdes[0], STDIN_FILENO); 354 (void)close(pdes[0]); 355 (void)close(pdes[1]); 356 357 /* not reading all calendar files, just set output to stdout */ 358 if (!doall) 359 return (stdout); 360 361 /* set output to a temporary file, so if no output don't send mail */ 362 (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP); 363 if ((fd = mkstemp(path)) < 0) 364 return (NULL); 365 return (fdopen(fd, "w+")); 366 } 367 368 void 369 closecal(fp) 370 FILE *fp; 371 { 372 struct stat sbuf; 373 int nread, pdes[2], status; 374 char buf[1024]; 375 376 if (!doall) 377 return; 378 379 (void)rewind(fp); 380 if (fstat(fileno(fp), &sbuf) || !sbuf.st_size) 381 goto done; 382 if (pipe(pdes) < 0) 383 goto done; 384 switch (vfork()) { 385 case -1: /* error */ 386 (void)close(pdes[0]); 387 (void)close(pdes[1]); 388 goto done; 389 case 0: 390 /* child -- set stdin to pipe output */ 391 if (pdes[0] != STDIN_FILENO) { 392 (void)dup2(pdes[0], STDIN_FILENO); 393 (void)close(pdes[0]); 394 } 395 (void)close(pdes[1]); 396 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F", 397 "\"Reminder Service\"", "-f", "root", NULL); 398 warn("execl: %s", _PATH_SENDMAIL); 399 _exit(1); 400 } 401 /* parent -- write to pipe input */ 402 (void)close(pdes[0]); 403 404 header[1].iov_base = header[3].iov_base = (void *)pw->pw_name; 405 header[1].iov_len = header[3].iov_len = strlen(pw->pw_name); 406 writev(pdes[1], header, 7); 407 while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0) 408 (void)write(pdes[1], buf, nread); 409 (void)close(pdes[1]); 410 done: (void)fclose(fp); 411 (void)unlink(path); 412 while (wait(&status) >= 0); 413 } 414 415 static char *months[] = { 416 "jan", "feb", "mar", "apr", "may", "jun", 417 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 418 }; 419 420 int 421 getmonth(s) 422 char *s; 423 { 424 char **p; 425 426 for (p = months; *p; ++p) 427 if (!strncasecmp(s, *p, 3)) 428 return ((p - months) + 1); 429 return (0); 430 } 431 432 static char *days[] = { 433 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 434 }; 435 436 int 437 getday(s) 438 char *s; 439 { 440 char **p; 441 442 for (p = days; *p; ++p) 443 if (!strncasecmp(s, *p, 3)) 444 return ((p - days) + 1); 445 return (0); 446 } 447 448 void 449 atodays(char ch, char *optarg, unsigned short *days) 450 { 451 int u; 452 453 u = atoi(optarg); 454 if ((u < 0) || (u > 366)) { 455 fprintf(stderr, 456 "%s: warning: -%c %d out of range 0-366, ignored.\n", 457 __progname, ch, u); 458 } else { 459 *days = u; 460 } 461 } 462 463 #define todigit(x) ((x) - '0') 464 #define ATOI2(x) (todigit((x)[0]) * 10 + todigit((x)[1])) 465 #define ISDIG2(x) (isdigit((x)[0]) && isdigit((x)[1])) 466 467 void 468 getmmdd(struct tm *tp, char *ds) 469 { 470 extern char *__progname; 471 int ok = FALSE; 472 struct tm ttm; 473 474 ttm = *tp; 475 ttm.tm_isdst = -1; 476 477 if (ISDIG2(ds)) { 478 ttm.tm_mon = ATOI2(ds) - 1; 479 ds += 2; 480 } 481 482 if (ISDIG2(ds)) { 483 ttm.tm_mday = ATOI2(ds); 484 ds += 2; 485 486 ok = TRUE; 487 } 488 489 if (ok) { 490 if (ISDIG2(ds) && ISDIG2(ds + 2)) { 491 ttm.tm_year = ATOI2(ds) * 100 - TM_YEAR_BASE; 492 ds += 2; 493 ttm.tm_year += ATOI2(ds); 494 } else if (ISDIG2(ds)) { 495 ttm.tm_year = ATOI2(ds); 496 if (ttm.tm_year < 69) 497 ttm.tm_year += 2000 - TM_YEAR_BASE; 498 else 499 ttm.tm_year += 1900 - TM_YEAR_BASE; 500 } 501 } 502 503 if (ok && (mktime(&ttm) < 0)) { 504 ok = FALSE; 505 } 506 507 if (ok) { 508 *tp = ttm; 509 } else { 510 fprintf(stderr, 511 "%s: warning: can't convert %s to date, ignored.\n", 512 __progname, ds); 513 usage(); 514 } 515 } 516 517 void 518 usage() 519 { 520 (void)fprintf(stderr, "Usage: %s [-a] [-d MMDD[[YY]YY]" \ 521 " [-f fname] [-l days] [-w days]\n", __progname); 522 exit(1); 523 } 524
Indexes created Wed Oct 22 13:09:56 GMT 2025