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, offset, 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 setnnames(void) 79 { 80 char buf[80]; 81 int i, l; 82 struct tm tm; 83 84 for (i = 0; i < 7; i++) { 85 tm.tm_wday = i; 86 strftime(buf, sizeof(buf), "%a", &tm); 87 for (l = strlen(buf); 88 l > 0 && isspace((unsigned char)buf[l - 1]); 89 l--) 90 ; 91 buf[l] = '\0'; 92 if (ndays[i].name != NULL) 93 free(ndays[i].name); 94 if ((ndays[i].name = strdup(buf)) == NULL) 95 errx(1, "cannot allocate memory"); 96 ndays[i].len = strlen(buf); 97 98 strftime(buf, sizeof(buf), "%A", &tm); 99 for (l = strlen(buf); 100 l > 0 && isspace((unsigned char)buf[l - 1]); 101 l--) 102 ; 103 buf[l] = '\0'; 104 if (fndays[i].name != NULL) 105 free(fndays[i].name); 106 if ((fndays[i].name = strdup(buf)) == NULL) 107 errx(1, "cannot allocate memory"); 108 fndays[i].len = strlen(buf); 109 } 110 111 for (i = 0; i < 12; i++) { 112 tm.tm_mon = i; 113 strftime(buf, sizeof(buf), "%b", &tm); 114 for (l = strlen(buf); 115 l > 0 && isspace((unsigned char)buf[l - 1]); 116 l--) 117 ; 118 buf[l] = '\0'; 119 if (nmonths[i].name != NULL) 120 free(nmonths[i].name); 121 if ((nmonths[i].name = strdup(buf)) == NULL) 122 errx(1, "cannot allocate memory"); 123 nmonths[i].len = strlen(buf); 124 125 strftime(buf, sizeof(buf), "%B", &tm); 126 for (l = strlen(buf); 127 l > 0 && isspace((unsigned char)buf[l - 1]); 128 l--) 129 ; 130 buf[l] = '\0'; 131 if (fnmonths[i].name != NULL) 132 free(fnmonths[i].name); 133 if ((fnmonths[i].name = strdup(buf)) == NULL) 134 errx(1, "cannot allocate memory"); 135 fnmonths[i].len = strlen(buf); 136 } 137 } 138 139 void 140 settime(now) 141 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 offset = tp->tm_wday == Friday ? 3 : 1; 155 header[5].iov_base = dayname; 156 157 oldl = NULL; 158 lbufp = setlocale(LC_TIME, NULL); 159 if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL) 160 errx(1, "cannot allocate memory"); 161 (void) setlocale(LC_TIME, "C"); 162 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 163 (void) setlocale(LC_TIME, (oldl != NULL ? oldl : "")); 164 if (oldl != NULL) 165 free(oldl); 166 167 setnnames(); 168 } 169 170 /* convert Day[/Month][/Year] into unix time (since 1970) 171 * Day: two digits, Month: two digits, Year: digits 172 */ 173 time_t Mktime (dp) 174 char *dp; 175 { 176 time_t t; 177 int d, m, y; 178 struct tm tm; 179 180 (void)time(&t); 181 tp = localtime(&t); 182 183 tm = tm0; 184 tm.tm_mday = tp->tm_mday; 185 tm.tm_mon = tp->tm_mon; 186 tm.tm_year = tp->tm_year; 187 188 switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) { 189 case 3: 190 if (y > 1900) 191 y -= 1900; 192 tm.tm_year = y; 193 /* FALLTHROUGH */ 194 case 2: 195 tm.tm_mon = m - 1; 196 /* FALLTHROUGH */ 197 case 1: 198 tm.tm_mday = d; 199 } 200 201 #ifdef DEBUG 202 fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t, 203 asctime(&tm)); 204 #endif 205 return(mktime(&tm)); 206 } 207 208 /* 209 * Possible date formats include any combination of: 210 * 3-charmonth (January, Jan, Jan) 211 * 3-charweekday (Friday, Monday, mon.) 212 * numeric month or day (1, 2, 04) 213 * 214 * Any character may separate them, or they may not be separated. Any line, 215 * following a line that is matched, that starts with "whitespace", is shown 216 * along with the matched line. 217 */ 218 int 219 isnow(endp, monthp, dayp, varp) 220 char *endp; 221 int *monthp; 222 int *dayp; 223 int *varp; 224 { 225 int day, flags, month = 0, v1, v2; 226 227 /* 228 * CONVENTION 229 * 230 * Month: 1-12 231 * Monthname: Jan .. Dec 232 * Day: 1-31 233 * Weekday: Mon-Sun 234 * 235 */ 236 237 flags = 0; 238 239 /* read first field */ 240 /* didn't recognize anything, skip it */ 241 if (!(v1 = getfield(endp, &endp, &flags))) 242 return (0); 243 244 /* Easter or Easter depending days */ 245 if (flags & F_EASTER) 246 day = v1 - 1; /* days since January 1 [0-365] */ 247 248 /* 249 * 1. {Weekday,Day} XYZ ... 250 * 251 * where Day is > 12 252 */ 253 else if (flags & F_ISDAY || v1 > 12) { 254 255 /* found a day; day: 1-31 or weekday: 1-7 */ 256 day = v1; 257 258 /* {Day,Weekday} {Month,Monthname} ... */ 259 /* if no recognizable month, assume just a day alone 260 * in other words, find month or use current month */ 261 if (!(month = getfield(endp, &endp, &flags))) 262 month = tp->tm_mon + 1; 263 } 264 265 /* 2. {Monthname} XYZ ... */ 266 else if (flags & F_ISMONTH) { 267 month = v1; 268 269 /* Monthname {day,weekday} */ 270 /* if no recognizable day, assume the first day in month */ 271 if (!(day = getfield(endp, &endp, &flags))) 272 day = 1; 273 } 274 275 /* Hm ... */ 276 else { 277 v2 = getfield(endp, &endp, &flags); 278 279 /* 280 * {Day} {Monthname} ... 281 * where Day <= 12 282 */ 283 if (flags & F_ISMONTH) { 284 day = v1; 285 month = v2; 286 *varp = 0; 287 } 288 289 /* {Month} {Weekday,Day} ... */ 290 else { 291 /* F_ISDAY set, v2 > 12, or no way to tell */ 292 month = v1; 293 /* if no recognizable day, assume the first */ 294 day = v2 ? v2 : 1; 295 *varp = 0; 296 } 297 } 298 299 /* convert Weekday into *next* Day, 300 * e.g.: 'Sunday' -> 22 301 * 'SundayLast' -> ?? 302 */ 303 if (flags & F_ISDAY) { 304 #ifdef DEBUG 305 fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month); 306 #endif 307 308 *varp = 1; 309 /* variable weekday, SundayLast, MondayFirst ... */ 310 if (day < 0 || day >= 10) { 311 312 /* negative offset; last, -4 .. -1 */ 313 if (day < 0) { 314 v1 = day/10 - 1; /* offset -4 ... -1 */ 315 day = 10 + (day % 10); /* day 1 ... 7 */ 316 317 /* day, eg '22nd' */ 318 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 319 320 /* (month length - day) / 7 + 1 */ 321 if (cumdays[month+1] - cumdays[month] >= v2 322 && ((int)((cumdays[month+1] - 323 cumdays[month] - v2) / 7) + 1) == -v1) 324 /* bingo ! */ 325 day = v2; 326 327 /* set to yesterday */ 328 else { 329 day = tp->tm_mday - 1; 330 if (day == 0) 331 return (0); 332 } 333 } 334 335 /* first, second ... +1 ... +5 */ 336 else { 337 v1 = day/10; /* offset: +1 (first Sunday) ... */ 338 day = day % 10; 339 340 /* day, eg '22th' */ 341 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 342 343 /* Hurrah! matched */ 344 if ( ((v2 - 1 + 7) / 7) == v1 ) 345 day = v2; 346 347 /* set to yesterday */ 348 else { 349 day = tp->tm_mday - 1; 350 if (day == 0) 351 return (0); 352 } 353 } 354 } 355 356 /* wired */ 357 else { 358 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 359 *varp = 1; 360 } 361 } 362 363 if (!(flags & F_EASTER)) { 364 if (day + cumdays[month] > cumdays[month + 1]) { /* off end of month */ 365 day -= (cumdays[month + 1] - cumdays[month]); /* adjust */ 366 if (++month > 12) /* next year */ 367 month = 1; 368 } 369 *monthp = month; 370 *dayp = day; 371 day = cumdays[month] + day; 372 } 373 else { 374 for (v1 = 0; day > cumdays[v1]; v1++) 375 ; 376 *monthp = v1 - 1; 377 *dayp = day - cumdays[v1 - 1]; 378 *varp = 1; 379 } 380 381 #ifdef DEBUG 382 fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday); 383 #endif 384 /* if today or today + offset days */ 385 if (day >= tp->tm_yday - f_dayBefore && 386 day <= tp->tm_yday + offset + f_dayAfter) 387 return (1); 388 389 /* if number of days left in this year + days to event in next year */ 390 if (yrdays - tp->tm_yday + day <= offset + f_dayAfter || 391 /* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */ 392 tp->tm_yday + day - f_dayBefore < 0 393 ) 394 return (1); 395 return (0); 396 } 397 398 399 int 400 getmonth(s) 401 char *s; 402 { 403 const char **p; 404 struct fixs *n; 405 406 for (n = fnmonths; n->name; ++n) 407 if (!strncasecmp(s, n->name, n->len)) 408 return ((n - fnmonths) + 1); 409 for (n = nmonths; n->name; ++n) 410 if (!strncasecmp(s, n->name, n->len)) 411 return ((n - nmonths) + 1); 412 for (p = months; *p; ++p) 413 if (!strncasecmp(s, *p, 3)) 414 return ((p - months) + 1); 415 return (0); 416 } 417 418 419 int 420 getday(s) 421 char *s; 422 { 423 const char **p; 424 struct fixs *n; 425 426 for (n = fndays; n->name; ++n) 427 if (!strncasecmp(s, n->name, n->len)) 428 return ((n - fndays) + 1); 429 for (n = ndays; n->name; ++n) 430 if (!strncasecmp(s, n->name, n->len)) 431 return ((n - ndays) + 1); 432 for (p = days; *p; ++p) 433 if (!strncasecmp(s, *p, 3)) 434 return ((p - days) + 1); 435 return (0); 436 } 437 438 /* return offset for variable weekdays 439 * -1 -> last weekday in month 440 * +1 -> first weekday in month 441 * ... etc ... 442 */ 443 int 444 getdayvar(s) 445 char *s; 446 { 447 int offs; 448 449 450 offs = strlen(s); 451 452 453 /* Sun+1 or Wednesday-2 454 * ^ ^ */ 455 456 /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */ 457 switch(*(s + offs - 2)) { 458 case '-': 459 return(-(atoi(s + offs - 1))); 460 case '+': 461 return(atoi(s + offs - 1)); 462 } 463 464 465 /* 466 * some aliases: last, first, second, third, fourth 467 */ 468 469 /* last */ 470 if (offs > 4 && !strcasecmp(s + offs - 4, "last")) 471 return(-1); 472 else if (offs > 5 && !strcasecmp(s + offs - 5, "first")) 473 return(+1); 474 else if (offs > 6 && !strcasecmp(s + offs - 6, "second")) 475 return(+2); 476 else if (offs > 5 && !strcasecmp(s + offs - 5, "third")) 477 return(+3); 478 else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth")) 479 return(+4); 480 481 482 /* no offset detected */ 483 return(0); 484 } 485