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: src/usr.bin/calendar/day.c,v 1.27 2007/06/09 05:54:13 grog Exp $"); 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 50struct tm *tp; 51static const struct tm tm0; 52int *cumdays, yrdays; 53char dayname[10]; 54 55 56/* 1-based month, 0-based days, cumulative */ 57int 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 62static char const *days[] = { 63 "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL, 64}; 65 66static const char *months[] = { 67 "jan", "feb", "mar", "apr", "may", "jun", 68 "jul", "aug", "sep", "oct", "nov", "dec", NULL, 69}; 70 71static struct fixs fndays[8]; /* full national days names */ 72static struct fixs ndays[8]; /* short national days names */ 73 74static struct fixs fnmonths[13]; /* full national months names */ 75static struct fixs nmonths[13]; /* short national month names */ 76 77 78void 79setnnames(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 140void 141settime(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 /* -A n ignores weekends */ 155 if (f_dayAfter != 0 && Friday != -1) { 156 int weeks = f_dayAfter / 5; 157 int days = f_dayAfter % 5; 158 f_dayAfter += 2 * weeks; 159 if (days && 160 (tp->tm_wday <= Friday) && 161 (tp->tm_wday+days > Friday)) { 162 f_dayAfter += 2; 163 } 164 } 165 header[5].iov_base = dayname; 166 167 oldl = NULL; 168 lbufp = setlocale(LC_TIME, NULL); 169 if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL) 170 errx(1, "cannot allocate memory"); 171 (void) setlocale(LC_TIME, "C"); 172 header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp); 173 (void) setlocale(LC_TIME, (oldl != NULL ? oldl : "")); 174 if (oldl != NULL) 175 free(oldl); 176 177 setnnames(); 178} 179 180/* convert Day[/Month][/Year] into unix time (since 1970) 181 * Day: two digits, Month: two digits, Year: digits 182 */ 183time_t 184Mktime (char *dp) 185{ 186 time_t t; 187 int d, m, y; 188 struct tm tm; 189 190 (void)time(&t); 191 tp = localtime(&t); 192 193 tm = tm0; 194 tm.tm_mday = tp->tm_mday; 195 tm.tm_mon = tp->tm_mon; 196 tm.tm_year = tp->tm_year; 197 198 switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) { 199 case 3: 200 if (y > 1900) 201 y -= 1900; 202 tm.tm_year = y; 203 /* FALLTHROUGH */ 204 case 2: 205 tm.tm_mon = m - 1; 206 /* FALLTHROUGH */ 207 case 1: 208 tm.tm_mday = d; 209 } 210 211#ifdef DEBUG 212 fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t, 213 asctime(&tm)); 214#endif 215 return(mktime(&tm)); 216} 217 218/* 219 * Possible date formats include any combination of: 220 * 3-charmonth (January, Jan, Jan) 221 * 3-charweekday (Friday, Monday, mon.) 222 * numeric month or day (1, 2, 04) 223 * 224 * Any character may separate them, or they may not be separated. Any line, 225 * following a line that is matched, that starts with "whitespace", is shown 226 * along with the matched line. 227 */ 228int 229isnow(char *endp, int *monthp, int *dayp, int *varp) 230{ 231 int day, flags, month = 0, v1, v2; 232 233 /* 234 * CONVENTION 235 * 236 * Month: 1-12 237 * Monthname: Jan .. Dec 238 * Day: 1-31 239 * Weekday: Mon-Sun 240 * 241 */ 242 243 flags = 0; 244 245 /* read first field */ 246 /* didn't recognize anything, skip it */ 247 if (!(v1 = getfield(endp, &endp, &flags))) 248 return (0); 249 250 /* Easter or Easter depending days */ 251 if (flags & F_EASTER) 252 day = v1 - 1; /* days since January 1 [0-365] */ 253 254 /* 255 * 1. {Weekday,Day} XYZ ... 256 * 257 * where Day is > 12 258 */ 259 else if (flags & F_ISDAY || v1 > 12) { 260 261 /* found a day; day: 1-31 or weekday: 1-7 */ 262 day = v1; 263 264 /* {Day,Weekday} {Month,Monthname} ... */ 265 /* if no recognizable month, assume just a day alone 266 * in other words, find month or use current month */ 267 if (!(month = getfield(endp, &endp, &flags))) 268 month = tp->tm_mon + 1; 269 } 270 271 /* 2. {Monthname} XYZ ... */ 272 else if (flags & F_ISMONTH) { 273 month = v1; 274 275 /* Monthname {day,weekday} */ 276 /* if no recognizable day, assume the first day in month */ 277 if (!(day = getfield(endp, &endp, &flags))) 278 day = 1; 279 } 280 281 /* Hm ... */ 282 else { 283 v2 = getfield(endp, &endp, &flags); 284 285 /* 286 * {Day} {Monthname} ... 287 * where Day <= 12 288 */ 289 if (flags & F_ISMONTH) { 290 day = v1; 291 month = v2; 292 *varp = 0; 293 } 294 295 /* {Month} {Weekday,Day} ... */ 296 else { 297 /* F_ISDAY set, v2 > 12, or no way to tell */ 298 month = v1; 299 /* if no recognizable day, assume the first */ 300 day = v2 ? v2 : 1; 301 *varp = 0; 302 } 303 } 304 305 /* convert Weekday into *next* Day, 306 * e.g.: 'Sunday' -> 22 307 * 'SundayLast' -> ?? 308 */ 309 if (flags & F_ISDAY) { 310#ifdef DEBUG 311 fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month); 312#endif 313 314 *varp = 1; 315 /* variable weekday, SundayLast, MondayFirst ... */ 316 if (day < 0 || day >= 10) { 317 318 /* negative offset; last, -4 .. -1 */ 319 if (day < 0) { 320 v1 = day/10 - 1; /* offset -4 ... -1 */ 321 day = 10 + (day % 10); /* day 1 ... 7 */ 322 323 /* day, eg '22nd' */ 324 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 325 326 /* (month length - day) / 7 + 1 */ 327 if (cumdays[month+1] - cumdays[month] >= v2 328 && ((int)((cumdays[month+1] - 329 cumdays[month] - v2) / 7) + 1) == -v1) 330 /* bingo ! */ 331 day = v2; 332 333 /* set to yesterday */ 334 else { 335 day = tp->tm_mday - 1; 336 if (day == 0) 337 return (0); 338 } 339 } 340 341 /* first, second ... +1 ... +5 */ 342 else { 343 v1 = day/10; /* offset: +1 (first Sunday) ... */ 344 day = day % 10; 345 346 /* day, eg '22th' */ 347 v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 348 349 /* Hurrah! matched */ 350 if ( ((v2 - 1 + 7) / 7) == v1 ) 351 day = v2; 352 353 /* set to yesterday */ 354 else { 355 day = tp->tm_mday - 1; 356 if (day == 0) 357 return (0); 358 } 359 } 360 } 361 362 /* wired */ 363 else { 364 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7); 365 *varp = 1; 366 } 367 } 368 369 if (!(flags & F_EASTER)) { 370 if (day + cumdays[month] > cumdays[month + 1]) { /* off end of month */ 371 day -= (cumdays[month + 1] - cumdays[month]); /* adjust */ 372 if (++month > 12) /* next year */ 373 month = 1; 374 } 375 *monthp = month; 376 *dayp = day; 377 day = cumdays[month] + day; 378 } 379 else { 380 for (v1 = 0; day > cumdays[v1]; v1++) 381 ; 382 *monthp = v1 - 1; 383 *dayp = day - cumdays[v1 - 1]; 384 *varp = 1; 385 } 386 387#ifdef DEBUG 388 fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, 389 cumdays[month], tp->tm_yday); 390#endif 391 392 /* When days before or days after is specified */ 393 /* no year rollover */ 394 if (day >= tp->tm_yday - f_dayBefore && 395 day <= tp->tm_yday + f_dayAfter) 396 return (1); 397 398 /* next year */ 399 if (tp->tm_yday + f_dayAfter >= yrdays) { 400 int end = tp->tm_yday + f_dayAfter - yrdays; 401 if (day <= end) 402 return (1); 403 } 404 405 /* previous year */ 406 if (tp->tm_yday - f_dayBefore < 0) { 407 int before = yrdays + (tp->tm_yday - f_dayBefore ); 408 if (day >= before) 409 return (1); 410 } 411 412 return (0); 413} 414 415 416int 417getmonth(char *s) 418{ 419 const char **p; 420 struct fixs *n; 421 422 for (n = fnmonths; n->name; ++n) 423 if (!strncasecmp(s, n->name, n->len)) 424 return ((n - fnmonths) + 1); 425 for (n = nmonths; n->name; ++n) 426 if (!strncasecmp(s, n->name, n->len)) 427 return ((n - nmonths) + 1); 428 for (p = months; *p; ++p) 429 if (!strncasecmp(s, *p, 3)) 430 return ((p - months) + 1); 431 return (0); 432} 433 434 435int 436getday(char *s) 437{ 438 const char **p; 439 struct fixs *n; 440 441 for (n = fndays; n->name; ++n) 442 if (!strncasecmp(s, n->name, n->len)) 443 return ((n - fndays) + 1); 444 for (n = ndays; n->name; ++n) 445 if (!strncasecmp(s, n->name, n->len)) 446 return ((n - ndays) + 1); 447 for (p = days; *p; ++p) 448 if (!strncasecmp(s, *p, 3)) 449 return ((p - days) + 1); 450 return (0); 451} 452 453/* return offset for variable weekdays 454 * -1 -> last weekday in month 455 * +1 -> first weekday in month 456 * ... etc ... 457 */ 458int 459getdayvar(char *s) 460{ 461 int offs; 462 463 464 offs = strlen(s); 465 466 467 /* Sun+1 or Wednesday-2 468 * ^ ^ */ 469 470 /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */ 471 switch(*(s + offs - 2)) { 472 case '-': 473 return(-(atoi(s + offs - 1))); 474 case '+': 475 return(atoi(s + offs - 1)); 476 } 477 478 479 /* 480 * some aliases: last, first, second, third, fourth 481 */ 482 483 /* last */ 484 if (offs > 4 && !strcasecmp(s + offs - 4, "last")) 485 return(-1); 486 else if (offs > 5 && !strcasecmp(s + offs - 5, "first")) 487 return(+1); 488 else if (offs > 6 && !strcasecmp(s + offs - 6, "second")) 489 return(+2); 490 else if (offs > 5 && !strcasecmp(s + offs - 5, "third")) 491 return(+3); 492 else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth")) 493 return(+4); 494 495 496 /* no offset detected */ 497 return(0); 498} 499