1 /* 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 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/types.h> 38 #include <sys/uio.h> 39 #include <ctype.h> 40 #include <err.h> 41 #include <locale.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <time.h> 46 47 #include "pathnames.h" 48 #include "calendar.h" 49 50 struct tm *tp; 51 static const struct tm tm0; 52 int *cumdays, yrdays; 53 char dayname[10]; 54 55 56 /* 1-based month, 0-based days, cumulative */ 57 int daytab[][14] = { 58 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 59 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 60 }; 61 62 static char const *days[] = { 63 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 64 }; 65 66 static const char *months[] = { 67 "jan", "feb", "mar", "apr", "may", "jun", 68 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 69 }; 70 71 static struct fixs fndays[8]; /* full national days names */ 72 static struct fixs ndays[8]; /* short national days names */ 73 74 static struct fixs fnmonths[13]; /* full national months names */ 75 static struct fixs nmonths[13]; /* short national month names */ 76 77 78 void 79 setnnames(void) 80 { 81 char buf[80]; 82 int i, l; 83 struct tm tm; 84 85 for (i = 0; i < 7; i++) { 86 tm.tm_wday = i; 87 strftime(buf, sizeof(buf), "%a", &tm); 88 for (l = strlen(buf); 89 l > 0 && isspace((unsigned char)buf[l - 1]); 90 l--) 91 ; 92 buf[l] = '\0'; 93 if (ndays[i].name != NULL) 94 free(ndays[i].name); 95 if ((ndays[i].name = strdup(buf)) == NULL) 96 errx(1, "cannot allocate memory"); 97 ndays[i].len = strlen(buf); 98 99 strftime(buf, sizeof(buf), "%A", &tm); 100 for (l = strlen(buf); 101 l > 0 && isspace((unsigned char)buf[l - 1]); 102 l--) 103 ; 104 buf[l] = '\0'; 105 if (fndays[i].name != NULL) 106 free(fndays[i].name); 107 if ((fndays[i].name = strdup(buf)) == NULL) 108 errx(1, "cannot allocate memory"); 109 fndays[i].len = strlen(buf); 110 } 111 112 for (i = 0; i < 12; i++) { 113 tm.tm_mon = i; 114 strftime(buf, sizeof(buf), "%b", &tm); 115 for (l = strlen(buf); 116 l > 0 && isspace((unsigned char)buf[l - 1]); 117 l--) 118 ; 119 buf[l] = '\0'; 120 if (nmonths[i].name != NULL) 121 free(nmonths[i].name); 122 if ((nmonths[i].name = strdup(buf)) == NULL) 123 errx(1, "cannot allocate memory"); 124 nmonths[i].len = strlen(buf); 125 126 strftime(buf, sizeof(buf), "%B", &tm); 127 for (l = strlen(buf); 128 l > 0 && isspace((unsigned char)buf[l - 1]); 129 l--) 130 ; 131 buf[l] = '\0'; 132 if (fnmonths[i].name != NULL) 133 free(fnmonths[i].name); 134 if ((fnmonths[i].name = strdup(buf)) == NULL) 135 errx(1, "cannot allocate memory"); 136 fnmonths[i].len = strlen(buf); 137 } 138 } 139 140 void 141 settime(time_t now) 142 { 143 char *oldl, *lbufp; 144 145 tp = localtime(&now); 146 if ( isleap(tp->tm_year + 1900) ) { 147 yrdays = 366; 148 cumdays = daytab[1]; 149 } else { 150 yrdays = 365; 151 cumdays = daytab[0]; 152 } 153 /* Friday displays Monday's events */ 154 if (f_dayAfter == 0 && f_dayBefore == 0 && Friday != -1) 155 f_dayAfter = tp->tm_wday == Friday ? 3 : 1; 156 header[5].iov_base = dayname; 157 158 oldl = NULL; 159 lbufp = setlocale(LC_TIME, NULL); 160 if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL) 161 errx(1, "cannot allocate memory"); 162 (void) setlocale(LC_TIME, "C"); 163 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 164 (void) setlocale(LC_TIME, (oldl != NULL ? oldl : "")); 165 if (oldl != NULL) 166 free(oldl); 167 168 setnnames(); 169 } 170 171 /* convert Day[/Month][/Year] into unix time (since 1970) 172 * Day: two digits, Month: two digits, Year: digits 173 */ 174 time_t 175 Mktime (char *dp) 176 { 177 time_t t; 178 int d, m, y; 179 struct tm tm; 180 181 (void)time(&t); 182 tp = localtime(&t); 183 184 tm = tm0; 185 tm.tm_mday = tp->tm_mday; 186 tm.tm_mon = tp->tm_mon; 187 tm.tm_year = tp->tm_year; 188 189 switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) { 190 case 3: 191 if (y > 1900) 192 y -= 1900; 193 tm.tm_year = y; 194 /* FALLTHROUGH */ 195 case 2: 196 tm.tm_mon = m - 1; 197 /* FALLTHROUGH */ 198 case 1: 199 tm.tm_mday = d; 200 } 201 202 #ifdef DEBUG 203 fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t, 204 asctime(&tm)); 205 #endif 206 return(mktime(&tm)); 207 } 208 209 /* 210 * Possible date formats include any combination of: 211 * 3-charmonth (January, Jan, Jan) 212 * 3-charweekday (Friday, Monday, mon.) 213 * numeric month or day (1, 2, 04) 214 * 215 * Any character may separate them, or they may not be separated. Any line, 216 * following a line that is matched, that starts with "whitespace", is shown 217 * along with the matched line. 218 */ 219 int 220 isnow(char *endp, int *monthp, int *dayp, int *varp) 221 { 222 int day, flags, month = 0, v1, v2; 223 224 /* 225 * CONVENTION 226 * 227 * Month: 1-12 228 * Monthname: Jan .. Dec 229 * Day: 1-31 230 * Weekday: Mon-Sun 231 * 232 */ 233 234 flags = 0; 235 236 /* read first field */ 237 /* didn't recognize anything, skip it */ 238 if (!(v1 = getfield(endp, &endp, &flags))) 239 return (0); 240 241 /* Easter or Easter depending days */ 242 if (flags & F_EASTER) 243 day = v1 - 1; /* days since January 1 [0-365] */ 244 245 /* 246 * 1. {Weekday,Day} XYZ ... 247 * 248 * where Day is > 12 249 */ 250 else if (flags & F_ISDAY || v1 > 12) { 251 252 /* found a day; day: 1-31 or weekday: 1-7 */ 253 day = v1; 254 255 /* {Day,Weekday} {Month,Monthname} ... */ 256 /* if no recognizable month, assume just a day alone 257 * in other words, find month or use current month */ 258 if (!(month = getfield(endp, &endp, &flags))) 259 month = tp->tm_mon + 1; 260 } 261 262 /* 2. {Monthname} XYZ ... */ 263 else if (flags & F_ISMONTH) { 264 month = v1; 265 266 /* Monthname {day,weekday} */ 267 /* if no recognizable day, assume the first day in month */ 268 if (!(day = getfield(endp, &endp, &flags))) 269 day = 1; 270 } 271 272 /* Hm ... */ 273 else { 274 v2 = getfield(endp, &endp, &flags); 275 276 /* 277 * {Day} {Monthname} ... 278 * where Day <= 12 279 */ 280 if (flags & F_ISMONTH) { 281 day = v1; 282 month = v2; 283 *varp = 0; 284 } 285 286 /* {Month} {Weekday,Day} ... */ 287 else { 288 /* F_ISDAY set, v2 > 12, or no way to tell */ 289 month = v1; 290 /* if no recognizable day, assume the first */ 291 day = v2 ? v2 : 1; 292 *varp = 0; 293 } 294 } 295 296 /* convert Weekday into *next* Day, 297 * e.g.: 'Sunday' -> 22 298 * 'SundayLast' -> ?? 299 */ 300 if (flags & F_ISDAY) { 301 #ifdef DEBUG 302 fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month); 303 #endif 304 305 *varp = 1; 306 /* variable weekday, SundayLast, MondayFirst ... */ 307 if (day < 0 || day >= 10) { 308 309 /* negative offset; last, -4 .. -1 */ 310 if (day < 0) { 311 v1 = day/10 - 1; /* offset -4 ... -1 */ 312 day = 10 + (day % 10); /* day 1 ... 7 */ 313 314 /* day, eg '22nd' */ 315 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 316 317 /* (month length - day) / 7 + 1 */ 318 if (cumdays[month+1] - cumdays[month] >= v2 319 && ((int)((cumdays[month+1] - 320 cumdays[month] - v2) / 7) + 1) == -v1) 321 /* bingo ! */ 322 day = v2; 323 324 /* set to yesterday */ 325 else { 326 day = tp->tm_mday - 1; 327 if (day == 0) 328 return (0); 329 } 330 } 331 332 /* first, second ... +1 ... +5 */ 333 else { 334 v1 = day/10; /* offset: +1 (first Sunday) ... */ 335 day = day % 10; 336 337 /* day, eg '22th' */ 338 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 339 340 /* Hurrah! matched */ 341 if ( ((v2 - 1 + 7) / 7) == v1 ) 342 day = v2; 343 344 /* set to yesterday */ 345 else { 346 day = tp->tm_mday - 1; 347 if (day == 0) 348 return (0); 349 } 350 } 351 } 352 353 /* wired */ 354 else { 355 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 356 *varp = 1; 357 } 358 } 359 360 if (!(flags & F_EASTER)) { 361 if (day + cumdays[month] > cumdays[month + 1]) { /* off end of month */ 362 day -= (cumdays[month + 1] - cumdays[month]); /* adjust */ 363 if (++month > 12) /* next year */ 364 month = 1; 365 } 366 *monthp = month; 367 *dayp = day; 368 day = cumdays[month] + day; 369 } 370 else { 371 for (v1 = 0; day > cumdays[v1]; v1++) 372 ; 373 *monthp = v1 - 1; 374 *dayp = day - cumdays[v1 - 1]; 375 *varp = 1; 376 } 377 378 #ifdef DEBUG 379 fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, 380 cumdays[month], tp->tm_yday); 381 #endif 382 383 /* When days before or days after is specified */ 384 /* no year rollover */ 385 if (day >= tp->tm_yday - f_dayBefore && 386 day <= tp->tm_yday + f_dayAfter) 387 return (1); 388 389 /* next year */ 390 if (tp->tm_yday + f_dayAfter >= yrdays) { 391 int end = tp->tm_yday + f_dayAfter - yrdays; 392 if (day <= end) 393 return (1); 394 } 395 396 /* previous year */ 397 if (tp->tm_yday - f_dayBefore < 0) { 398 int before = yrdays + (tp->tm_yday - f_dayBefore ); 399 if (day >= before) 400 return (1); 401 } 402 403 return (0); 404 } 405 406 407 int 408 getmonth(char *s) 409 { 410 const char **p; 411 struct fixs *n; 412 413 for (n = fnmonths; n->name; ++n) 414 if (!strncasecmp(s, n->name, n->len)) 415 return ((n - fnmonths) + 1); 416 for (n = nmonths; n->name; ++n) 417 if (!strncasecmp(s, n->name, n->len)) 418 return ((n - nmonths) + 1); 419 for (p = months; *p; ++p) 420 if (!strncasecmp(s, *p, 3)) 421 return ((p - months) + 1); 422 return (0); 423 } 424 425 426 int 427 getday(char *s) 428 { 429 const char **p; 430 struct fixs *n; 431 432 for (n = fndays; n->name; ++n) 433 if (!strncasecmp(s, n->name, n->len)) 434 return ((n - fndays) + 1); 435 for (n = ndays; n->name; ++n) 436 if (!strncasecmp(s, n->name, n->len)) 437 return ((n - ndays) + 1); 438 for (p = days; *p; ++p) 439 if (!strncasecmp(s, *p, 3)) 440 return ((p - days) + 1); 441 return (0); 442 } 443 444 /* return offset for variable weekdays 445 * -1 -> last weekday in month 446 * +1 -> first weekday in month 447 * ... etc ... 448 */ 449 int 450 getdayvar(char *s) 451 { 452 int offs; 453 454 455 offs = strlen(s); 456 457 458 /* Sun+1 or Wednesday-2 459 * ^ ^ */ 460 461 /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */ 462 switch(*(s + offs - 2)) { 463 case '-': 464 return(-(atoi(s + offs - 1))); 465 case '+': 466 return(atoi(s + offs - 1)); 467 } 468 469 470 /* 471 * some aliases: last, first, second, third, fourth 472 */ 473 474 /* last */ 475 if (offs > 4 && !strcasecmp(s + offs - 4, "last")) 476 return(-1); 477 else if (offs > 5 && !strcasecmp(s + offs - 5, "first")) 478 return(+1); 479 else if (offs > 6 && !strcasecmp(s + offs - 6, "second")) 480 return(+2); 481 else if (offs > 5 && !strcasecmp(s + offs - 5, "third")) 482 return(+3); 483 else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth")) 484 return(+4); 485 486 487 /* no offset detected */ 488 return(0); 489 } 490