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 int *cumdays, offset, yrdays; 52 char dayname[10]; 53 54 55 /* 1-based month, 0-based days, cumulative */ 56 int daytab[][14] = { 57 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 58 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 59 }; 60 61 static char const *days[] = { 62 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 63 }; 64 65 static const char *months[] = { 66 "jan", "feb", "mar", "apr", "may", "jun", 67 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 68 }; 69 70 static struct fixs fndays[8]; /* full national days names */ 71 static struct fixs ndays[8]; /* short national days names */ 72 73 static struct fixs fnmonths[13]; /* full national months names */ 74 static struct fixs nmonths[13]; /* short national month names */ 75 76 77 void setnnames(void) 78 { 79 char buf[80]; 80 int i, l; 81 struct tm tm; 82 83 for (i = 0; i < 7; i++) { 84 tm.tm_wday = i; 85 strftime(buf, sizeof(buf), "%a", &tm); 86 for (l = strlen(buf); 87 l > 0 && isspace((unsigned char)buf[l - 1]); 88 l--) 89 ; 90 buf[l] = '\0'; 91 if (ndays[i].name != NULL) 92 free(ndays[i].name); 93 if ((ndays[i].name = strdup(buf)) == NULL) 94 errx(1, "cannot allocate memory"); 95 ndays[i].len = strlen(buf); 96 97 strftime(buf, sizeof(buf), "%A", &tm); 98 for (l = strlen(buf); 99 l > 0 && isspace((unsigned char)buf[l - 1]); 100 l--) 101 ; 102 buf[l] = '\0'; 103 if (fndays[i].name != NULL) 104 free(fndays[i].name); 105 if ((fndays[i].name = strdup(buf)) == NULL) 106 errx(1, "cannot allocate memory"); 107 fndays[i].len = strlen(buf); 108 } 109 110 for (i = 0; i < 12; i++) { 111 tm.tm_mon = i; 112 strftime(buf, sizeof(buf), "%b", &tm); 113 for (l = strlen(buf); 114 l > 0 && isspace((unsigned char)buf[l - 1]); 115 l--) 116 ; 117 buf[l] = '\0'; 118 if (nmonths[i].name != NULL) 119 free(nmonths[i].name); 120 if ((nmonths[i].name = strdup(buf)) == NULL) 121 errx(1, "cannot allocate memory"); 122 nmonths[i].len = strlen(buf); 123 124 strftime(buf, sizeof(buf), "%B", &tm); 125 for (l = strlen(buf); 126 l > 0 && isspace((unsigned char)buf[l - 1]); 127 l--) 128 ; 129 buf[l] = '\0'; 130 if (fnmonths[i].name != NULL) 131 free(fnmonths[i].name); 132 if ((fnmonths[i].name = strdup(buf)) == NULL) 133 errx(1, "cannot allocate memory"); 134 fnmonths[i].len = strlen(buf); 135 } 136 } 137 138 void 139 settime(now) 140 time_t now; 141 { 142 char *oldl, *lbufp; 143 144 tp = localtime(&now); 145 if ( isleap(tp->tm_year + 1900) ) { 146 yrdays = 366; 147 cumdays = daytab[1]; 148 } else { 149 yrdays = 365; 150 cumdays = daytab[0]; 151 } 152 /* Friday displays Monday's events */ 153 offset = tp->tm_wday == Friday ? 3 : 1; 154 header[5].iov_base = dayname; 155 156 oldl = NULL; 157 lbufp = setlocale(LC_TIME, NULL); 158 if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL) 159 errx(1, "cannot allocate memory"); 160 (void) setlocale(LC_TIME, "C"); 161 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 162 (void) setlocale(LC_TIME, (oldl != NULL ? oldl : "")); 163 if (oldl != NULL) 164 free(oldl); 165 166 setnnames(); 167 } 168 169 /* convert Day[/Month][/Year] into unix time (since 1970) 170 * Day: two digits, Month: two digits, Year: digits 171 */ 172 time_t Mktime (dp) 173 char *dp; 174 { 175 time_t t; 176 int d, m, y; 177 struct tm tm; 178 179 (void)time(&t); 180 tp = localtime(&t); 181 182 tm.tm_sec = 0; 183 tm.tm_min = 0; 184 tm.tm_hour = 0; 185 tm.tm_wday = 0; 186 tm.tm_mday = tp->tm_mday; 187 tm.tm_mon = tp->tm_mon; 188 tm.tm_year = tp->tm_year; 189 190 switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) { 191 case 3: 192 if (y > 1900) 193 y -= 1900; 194 tm.tm_year = y; 195 /* FALLTHROUGH */ 196 case 2: 197 tm.tm_mon = m - 1; 198 /* FALLTHROUGH */ 199 case 1: 200 tm.tm_mday = d; 201 } 202 203 #ifdef DEBUG 204 fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t, 205 asctime(&tm)); 206 #endif 207 return(mktime(&tm)); 208 } 209 210 /* 211 * Possible date formats include any combination of: 212 * 3-charmonth (January, Jan, Jan) 213 * 3-charweekday (Friday, Monday, mon.) 214 * numeric month or day (1, 2, 04) 215 * 216 * Any character may separate them, or they may not be separated. Any line, 217 * following a line that is matched, that starts with "whitespace", is shown 218 * along with the matched line. 219 */ 220 int 221 isnow(endp, monthp, dayp, varp) 222 char *endp; 223 int *monthp; 224 int *dayp; 225 int *varp; 226 { 227 int day, flags, month = 0, v1, v2; 228 229 /* 230 * CONVENTION 231 * 232 * Month: 1-12 233 * Monthname: Jan .. Dec 234 * Day: 1-31 235 * Weekday: Mon-Sun 236 * 237 */ 238 239 flags = 0; 240 241 /* read first field */ 242 /* didn't recognize anything, skip it */ 243 if (!(v1 = getfield(endp, &endp, &flags))) 244 return (0); 245 246 /* Easter or Easter depending days */ 247 if (flags & F_EASTER) 248 day = v1 - 1; /* days since January 1 [0-365] */ 249 250 /* 251 * 1. {Weekday,Day} XYZ ... 252 * 253 * where Day is > 12 254 */ 255 else if (flags & F_ISDAY || v1 > 12) { 256 257 /* found a day; day: 1-31 or weekday: 1-7 */ 258 day = v1; 259 260 /* {Day,Weekday} {Month,Monthname} ... */ 261 /* if no recognizable month, assume just a day alone 262 * in other words, find month or use current month */ 263 if (!(month = getfield(endp, &endp, &flags))) 264 month = tp->tm_mon + 1; 265 } 266 267 /* 2. {Monthname} XYZ ... */ 268 else if (flags & F_ISMONTH) { 269 month = v1; 270 271 /* Monthname {day,weekday} */ 272 /* if no recognizable day, assume the first day in month */ 273 if (!(day = getfield(endp, &endp, &flags))) 274 day = 1; 275 } 276 277 /* Hm ... */ 278 else { 279 v2 = getfield(endp, &endp, &flags); 280 281 /* 282 * {Day} {Monthname} ... 283 * where Day <= 12 284 */ 285 if (flags & F_ISMONTH) { 286 day = v1; 287 month = v2; 288 *varp = 0; 289 } 290 291 /* {Month} {Weekday,Day} ... */ 292 else { 293 /* F_ISDAY set, v2 > 12, or no way to tell */ 294 month = v1; 295 /* if no recognizable day, assume the first */ 296 day = v2 ? v2 : 1; 297 *varp = 0; 298 } 299 } 300 301 /* convert Weekday into *next* Day, 302 * e.g.: 'Sunday' -> 22 303 * 'SundayLast' -> ?? 304 */ 305 if (flags & F_ISDAY) { 306 #ifdef DEBUG 307 fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month); 308 #endif 309 310 *varp = 1; 311 /* variable weekday, SundayLast, MondayFirst ... */ 312 if (day < 0 || day >= 10) { 313 314 /* negative offset; last, -4 .. -1 */ 315 if (day < 0) { 316 v1 = day/10 - 1; /* offset -4 ... -1 */ 317 day = 10 + (day % 10); /* day 1 ... 7 */ 318 319 /* day, eg '22nd' */ 320 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 321 322 /* (month length - day) / 7 + 1 */ 323 if (cumdays[month+1] - cumdays[month] >= v2 324 && ((int)((cumdays[month+1] - 325 cumdays[month] - v2) / 7) + 1) == -v1) 326 /* bingo ! */ 327 day = v2; 328 329 /* set to yesterday */ 330 else { 331 day = tp->tm_mday - 1; 332 if (day == 0) 333 return (0); 334 } 335 } 336 337 /* first, second ... +1 ... +5 */ 338 else { 339 v1 = day/10; /* offset: +1 (first Sunday) ... */ 340 day = day % 10; 341 342 /* day, eg '22th' */ 343 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 344 345 /* Hurrah! matched */ 346 if ( ((v2 - 1 + 7) / 7) == v1 ) 347 day = v2; 348 349 /* set to yesterday */ 350 else { 351 day = tp->tm_mday - 1; 352 if (day == 0) 353 return (0); 354 } 355 } 356 } 357 358 /* wired */ 359 else { 360 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 361 *varp = 1; 362 } 363 } 364 365 if (!(flags & F_EASTER)) { 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, cumdays[month], tp->tm_yday); 380 #endif 381 /* if today or today + offset days */ 382 if (day >= tp->tm_yday - f_dayBefore && 383 day <= tp->tm_yday + offset + f_dayAfter) 384 return (1); 385 386 /* if number of days left in this year + days to event in next year */ 387 if (yrdays - tp->tm_yday + day <= offset + f_dayAfter || 388 /* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */ 389 tp->tm_yday + day - f_dayBefore < 0 390 ) 391 return (1); 392 return (0); 393 } 394 395 396 int 397 getmonth(s) 398 char *s; 399 { 400 const char **p; 401 struct fixs *n; 402 403 for (n = fnmonths; n->name; ++n) 404 if (!strncasecmp(s, n->name, n->len)) 405 return ((n - fnmonths) + 1); 406 for (n = nmonths; n->name; ++n) 407 if (!strncasecmp(s, n->name, n->len)) 408 return ((n - nmonths) + 1); 409 for (p = months; *p; ++p) 410 if (!strncasecmp(s, *p, 3)) 411 return ((p - months) + 1); 412 return (0); 413 } 414 415 416 int 417 getday(s) 418 char *s; 419 { 420 const char **p; 421 struct fixs *n; 422 423 for (n = fndays; n->name; ++n) 424 if (!strncasecmp(s, n->name, n->len)) 425 return ((n - fndays) + 1); 426 for (n = ndays; n->name; ++n) 427 if (!strncasecmp(s, n->name, n->len)) 428 return ((n - ndays) + 1); 429 for (p = days; *p; ++p) 430 if (!strncasecmp(s, *p, 3)) 431 return ((p - days) + 1); 432 return (0); 433 } 434 435 /* return offset for variable weekdays 436 * -1 -> last weekday in month 437 * +1 -> first weekday in month 438 * ... etc ... 439 */ 440 int 441 getdayvar(s) 442 char *s; 443 { 444 int offs; 445 446 447 offs = strlen(s); 448 449 450 /* Sun+1 or Wednesday-2 451 * ^ ^ */ 452 453 /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */ 454 switch(*(s + offs - 2)) { 455 case '-': 456 return(-(atoi(s + offs - 1))); 457 break; 458 case '+': 459 return(atoi(s + offs - 1)); 460 break; 461 } 462 463 464 /* 465 * some aliases: last, first, second, third, fourth 466 */ 467 468 /* last */ 469 if (offs > 4 && !strcasecmp(s + offs - 4, "last")) 470 return(-1); 471 else if (offs > 5 && !strcasecmp(s + offs - 5, "first")) 472 return(+1); 473 else if (offs > 6 && !strcasecmp(s + offs - 6, "second")) 474 return(+2); 475 else if (offs > 5 && !strcasecmp(s + offs - 5, "third")) 476 return(+3); 477 else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth")) 478 return(+4); 479 480 481 /* no offset detected */ 482 return(0); 483 } 484