usr.bin/calendar/parsedata.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 1992-2009 Edwin Groothuis <edwin@FreeBSD.org>.
   5  * 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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <ctype.h>
  34 #include <math.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <err.h>
  39
  40 #include "calendar.h"
  41
  42 static char *showflags(int flags);
  43 static int isonlydigits(char *s, int nostar);
  44 static const char *getmonthname(int i);
  45 static int checkmonth(char *s, size_t *len, size_t *offset, const char **month);
  46 static const char *getdayofweekname(int i);
  47 static int checkdayofweek(char *s, size_t *len, size_t *offset, const char **dow);
  48 static int indextooffset(char *s);
  49 static int parseoffset(char *s);
  50 static char *floattoday(int year, double f);
  51 static char *floattotime(double f);
  52 static int wdayom (int day, int offset, int month, int year);
  53
  54 /*
  55  * Expected styles:
  56  *
  57  * Date                 ::=     Month . ' ' . DayOfMonth |
  58  *                              Month . ' ' . DayOfWeek . ModifierIndex |
  59  *                              Month . '/' . DayOfMonth |
  60  *                              Month . '/' . DayOfWeek . ModifierIndex |
  61  *                              DayOfMonth . ' ' . Month |
  62  *                              DayOfMonth . '/' . Month |
  63  *                              DayOfWeek . ModifierIndex . ' ' .Month |
  64  *                              DayOfWeek . ModifierIndex . '/' .Month |
  65  *                              DayOfWeek . ModifierIndex |
  66  *                              SpecialDay . ModifierOffset
  67  *
  68  * Month                ::=     MonthName | MonthNumber | '*'
  69  * MonthNumber          ::=     '0' ... '9' | '00' ... '09' | '10' ... '12'
  70  * MonthName            ::=     MonthNameShort | MonthNameLong
  71  * MonthNameLong        ::=     'January' ... 'December'
  72  * MonthNameShort       ::=     'Jan' ... 'Dec' | 'Jan.' ... 'Dec.'
  73  *
  74  * DayOfWeek            ::=     DayOfWeekShort | DayOfWeekLong
  75  * DayOfWeekShort       ::=     'Mon' .. 'Sun'
  76  * DayOfWeekLong        ::=     'Monday' .. 'Sunday'
  77  * DayOfMonth           ::=     '0' ... '9' | '00' ... '09' | '10' ... '29' |
  78  *                              '30' ... '31' | '*'
  79  *
  80  * ModifierOffset       ::=     '' | '+' . ModifierNumber | '-' . ModifierNumber
  81  * ModifierNumber       ::=     '0' ... '9' | '00' ... '99' | '000' ... '299' |
  82  *                              '300' ... '359' | '360' ... '365'
  83  * ModifierIndex        ::=     'Second' | 'Third' | 'Fourth' | 'Fifth' |
  84  *                              'First' | 'Last'
  85  *
  86  * SpecialDay           ::=     'Easter' | 'Paskha' | 'ChineseNewYear'
  87  *
  88  */
  89 static int
  90 determinestyle(char *date, int *flags,
  91     char *month, int *imonth, char *dayofmonth, int *idayofmonth,
  92     char *dayofweek, int *idayofweek, char *modifieroffset,
  93     char *modifierindex, char *specialday, char *year, int *iyear)
  94 {
  95         char *p, *p1, *p2, *py;
  96         const char *dow, *pmonth;
  97         char pold;
  98         size_t len, offset;
  99
 100         *flags = F_NONE;
 101         *month = '\0';
 102         *imonth = 0;
 103         *year = '\0';
 104         *iyear = 0;
 105         *dayofmonth = '\0';
 106         *idayofmonth = 0;
 107         *dayofweek = '\0';
 108         *idayofweek = 0;
 109         *modifieroffset = '\0';
 110         *modifierindex = '\0';
 111         *specialday = '\0';
 112
 113 #define CHECKSPECIAL(s1, s2, lens2, type)                               \
 114         if (s2 != NULL && strncmp(s1, s2, lens2) == 0) {                \
 115                 *flags |= F_SPECIALDAY;                                 \
 116                 *flags |= type;                                         \
 117                 *flags |= F_VARIABLE;                                   \
 118                 if (strlen(s1) == lens2) {                              \
 119                         strcpy(specialday, s1);                         \
 120                         return (1);                                     \
 121                 }                                                       \
 122                 strncpy(specialday, s1, lens2);                         \
 123                 specialday[lens2] = '\0';                               \
 124                 strcpy(modifieroffset, s1 + lens2);                     \
 125                 *flags |= F_MODIFIEROFFSET;                             \
 126                 return (1);                                             \
 127         }
 128
 129         if ((p = strchr(date, ' ')) == NULL) {
 130                 if ((p = strchr(date, '/')) == NULL) {
 131                         CHECKSPECIAL(date, STRING_CNY, strlen(STRING_CNY),
 132                             F_CNY);
 133                         CHECKSPECIAL(date, ncny.name, ncny.len, F_CNY);
 134                         CHECKSPECIAL(date, STRING_NEWMOON,
 135                             strlen(STRING_NEWMOON), F_NEWMOON);
 136                         CHECKSPECIAL(date, nnewmoon.name, nnewmoon.len,
 137                             F_NEWMOON);
 138                         CHECKSPECIAL(date, STRING_FULLMOON,
 139                             strlen(STRING_FULLMOON), F_FULLMOON);
 140                         CHECKSPECIAL(date, nfullmoon.name, nfullmoon.len,
 141                             F_FULLMOON);
 142                         CHECKSPECIAL(date, STRING_PASKHA,
 143                             strlen(STRING_PASKHA), F_PASKHA);
 144                         CHECKSPECIAL(date, npaskha.name, npaskha.len, F_PASKHA);
 145                         CHECKSPECIAL(date, STRING_EASTER,
 146                             strlen(STRING_EASTER), F_EASTER);
 147                         CHECKSPECIAL(date, neaster.name, neaster.len, F_EASTER);
 148                         CHECKSPECIAL(date, STRING_MAREQUINOX,
 149                             strlen(STRING_MAREQUINOX), F_MAREQUINOX);
 150                         CHECKSPECIAL(date, nmarequinox.name, nmarequinox.len,
 151                             F_SEPEQUINOX);
 152                         CHECKSPECIAL(date, STRING_SEPEQUINOX,
 153                             strlen(STRING_SEPEQUINOX), F_SEPEQUINOX);
 154                         CHECKSPECIAL(date, nsepequinox.name, nsepequinox.len,
 155                             F_SEPEQUINOX);
 156                         CHECKSPECIAL(date, STRING_JUNSOLSTICE,
 157                             strlen(STRING_JUNSOLSTICE), F_JUNSOLSTICE);
 158                         CHECKSPECIAL(date, njunsolstice.name, njunsolstice.len,
 159                             F_JUNSOLSTICE);
 160                         CHECKSPECIAL(date, STRING_DECSOLSTICE,
 161                             strlen(STRING_DECSOLSTICE), F_DECSOLSTICE);
 162                         CHECKSPECIAL(date, ndecsolstice.name, ndecsolstice.len,
 163                             F_DECSOLSTICE);
 164                         if (checkdayofweek(date, &len, &offset, &dow) != 0) {
 165                                 *flags |= F_DAYOFWEEK;
 166                                 *flags |= F_VARIABLE;
 167                                 *idayofweek = offset;
 168                                 if (strlen(date) == len) {
 169                                         strcpy(dayofweek, date);
 170                                         return (1);
 171                                 }
 172                                 strncpy(dayofweek, date, len);
 173                                 dayofweek[len] = '\0';
 174                                 strcpy(modifierindex, date + len);
 175                                 *flags |= F_MODIFIERINDEX;
 176                                 return (1);
 177                         }
 178                         if (isonlydigits(date, 1)) {
 179                                 /* Assume month number only */
 180                                 *flags |= F_MONTH;
 181                                 *imonth = (int)strtol(date, (char **)NULL, 10);
 182                                 strcpy(month, getmonthname(*imonth));
 183                                 return(1);
 184                         }
 185                         return (0);
 186                 }
 187         }
 188
 189         /*
 190          * After this, leave by goto-ing to "allfine" or "fail" to restore the
 191          * original data in `date'.
 192          */
 193         pold = *p;
 194         *p = 0;
 195         p1 = date;
 196         p2 = p + 1;
 197         /* Now p2 points to the next field and p1 to the first field */
 198
 199         if ((py = strchr(p2, '/')) != NULL) {
 200                 /* We have a year in the string. Now this is getting tricky */
 201                 strcpy(year, p1);
 202                 *iyear = (int)strtol(year, NULL, 10);
 203                 p1 = p2;
 204                 p2 = py + 1;
 205                 *py = 0;
 206                 *flags |= F_YEAR;
 207         }
 208
 209         /* Check if there is a month-string in the date */
 210         if ((checkmonth(p1, &len, &offset, &pmonth) != 0)
 211             || (checkmonth(p2, &len, &offset, &pmonth) != 0 && (p2 = p1))) {
 212                 /* p2 is the non-month part */
 213                 *flags |= F_MONTH;
 214                 *imonth = offset;
 215
 216                 strcpy(month, getmonthname(offset));
 217                 if (isonlydigits(p2, 1)) {
 218                         strcpy(dayofmonth, p2);
 219                         *idayofmonth = (int)strtol(p2, (char **)NULL, 10);
 220                         *flags |= F_DAYOFMONTH;
 221                         goto allfine;
 222                 }
 223                 if (strcmp(p2, "*") == 0) {
 224                         *flags |= F_ALLDAY;
 225                         goto allfine;
 226                 }
 227
 228                 if (checkdayofweek(p2, &len, &offset, &dow) != 0) {
 229                         *flags |= F_DAYOFWEEK;
 230                         *flags |= F_VARIABLE;
 231                         *idayofweek = offset;
 232                         strcpy(dayofweek, getdayofweekname(offset));
 233                         if (strlen(p2) == len)
 234                                 goto allfine;
 235                         strcpy(modifierindex, p2 + len);
 236                         *flags |= F_MODIFIERINDEX;
 237                         goto allfine;
 238                 }
 239                 goto fail;
 240         }
 241
 242         /* Check if there is an every-day or every-month in the string */
 243         if ((strcmp(p1, "*") == 0 && isonlydigits(p2, 1))
 244             || (strcmp(p2, "*") == 0 && isonlydigits(p1, 1) && (p2 = p1))) {
 245                 int d;
 246
 247                 *flags |= F_ALLMONTH;
 248                 *flags |= F_DAYOFMONTH;
 249                 d = (int)strtol(p2, (char **)NULL, 10);
 250                 *idayofmonth = d;
 251                 sprintf(dayofmonth, "%d", d);
 252                 goto allfine;
 253         }
 254
 255         /* Month as a number, then a weekday */
 256         if (isonlydigits(p1, 1)
 257             && checkdayofweek(p2, &len, &offset, &dow) != 0) {
 258                 int d;
 259
 260                 *flags |= F_MONTH;
 261                 *flags |= F_DAYOFWEEK;
 262                 *flags |= F_VARIABLE;
 263
 264                 *idayofweek = offset;
 265                 d = (int)strtol(p1, (char **)NULL, 10);
 266                 *imonth = d;
 267                 strcpy(month, getmonthname(d));
 268
 269                 strcpy(dayofweek, getdayofweekname(offset));
 270                 if (strlen(p2) == len)
 271                         goto allfine;
 272                 strcpy(modifierindex, p2 + len);
 273                 *flags |= F_MODIFIERINDEX;
 274                 goto allfine;
 275         }
 276
 277         /* If both the month and date are specified as numbers */
 278         if (isonlydigits(p1, 1) && isonlydigits(p2, 0)) {
 279                 /* Now who wants to be this ambiguous? :-( */
 280                 int m, d;
 281
 282                 if (strchr(p2, '*') != NULL)
 283                         *flags |= F_VARIABLE;
 284
 285                 m = (int)strtol(p1, (char **)NULL, 10);
 286                 d = (int)strtol(p2, (char **)NULL, 10);
 287
 288                 *flags |= F_MONTH;
 289                 *flags |= F_DAYOFMONTH;
 290
 291                 if (m > 12) {
 292                         *imonth = d;
 293                         *idayofmonth = m;
 294                         strcpy(month, getmonthname(d));
 295                         sprintf(dayofmonth, "%d", m);
 296                 } else {
 297                         *imonth = m;
 298                         *idayofmonth = d;
 299                         strcpy(month, getmonthname(m));
 300                         sprintf(dayofmonth, "%d", d);
 301                 }
 302                 goto allfine;
 303         }
 304
 305         /* FALLTHROUGH */
 306 fail:
 307         *p = pold;
 308         return (0);
 309 allfine:
 310         *p = pold;
 311         return (1);
 312
 313 }
 314
 315 void
 316 remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
 317     int dd, char *extra);
 318 void
 319 remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
 320     int dd, char *extra)
 321 {
 322         static int warned = 0;
 323
 324         if (*rememberindex >= MAXCOUNT - 1) {
 325                 if (warned == 0)
 326                         warnx("Index > %d, ignored", MAXCOUNT);
 327                 warned++;
 328                 return;
 329         }
 330         y[*rememberindex] = yy;
 331         m[*rememberindex] = mm;
 332         d[*rememberindex] = dd;
 333         if (extra != NULL)
 334                 strcpy(ed[*rememberindex], extra);
 335         else
 336                 ed[*rememberindex][0] = '\0';
 337         *rememberindex += 1;
 338 }
 339
 340 static void
 341 debug_determinestyle(int dateonly, char *date, int flags, char *month,
 342     int imonth, char *dayofmonth, int idayofmonth, char *dayofweek,
 343     int idayofweek, char *modifieroffset, char *modifierindex, char *specialday,
 344     char *year, int iyear)
 345 {
 346
 347         if (dateonly != 0) {
 348                 printf("-------\ndate: |%s|\n", date);
 349                 if (dateonly == 1)
 350                         return;
 351         }
 352         printf("flags: %x - %s\n", flags, showflags(flags));
 353         if (modifieroffset[0] != '\0')
 354                 printf("modifieroffset: |%s|\n", modifieroffset);
 355         if (modifierindex[0] != '\0')
 356                 printf("modifierindex: |%s|\n", modifierindex);
 357         if (year[0] != '\0')
 358                 printf("year: |%s| (%d)\n", year, iyear);
 359         if (month[0] != '\0')
 360                 printf("month: |%s| (%d)\n", month, imonth);
 361         if (dayofmonth[0] != '\0')
 362                 printf("dayofmonth: |%s| (%d)\n", dayofmonth, idayofmonth);
 363         if (dayofweek[0] != '\0')
 364                 printf("dayofweek: |%s| (%d)\n", dayofweek, idayofweek);
 365         if (specialday[0] != '\0')
 366                 printf("specialday: |%s|\n", specialday);
 367 }
 368
 369 static struct yearinfo {
 370         int year;
 371         int ieaster, ipaskha, firstcnyday;
 372         double ffullmoon[MAXMOONS], fnewmoon[MAXMOONS];
 373         double ffullmooncny[MAXMOONS], fnewmooncny[MAXMOONS];
 374         int ichinesemonths[MAXMOONS];
 375         double equinoxdays[2], solsticedays[2];
 376         int *monthdays;
 377         struct yearinfo *next;
 378 } *years, *yearinfo;
 379
 380 /*
 381  * Calculate dates with offset from weekdays, like Thurs-3, Wed+2, etc.
 382  * day is the day of the week,
 383  * offset the ordinal number of the weekday in the month.
 384  */
 385 static int
 386 wdayom (int day, int offset, int month, int year)
 387 {
 388 /* Weekday of first day in month */
 389         int wday1;                                /* first day of month */
 390 /* Weekday of last day in month */
 391         int wdayn;
 392         int d;
 393
 394         wday1 = first_dayofweek_of_month(year, month);
 395         if (wday1 < 0)                          /* not set */
 396                 return (wday1);
 397         /*
 398          * Date of zeroth or first of our weekday in month, depending on the
 399          * relationship with the first of the month.  The range is -6:6.
 400          */
 401         d = (day - wday1 + 1) % 7;
 402         /*
 403          * Which way are we counting?  Offset 0 is invalid, abs (offset) > 5 is
 404          * meaningless, but that's OK.  Offset 5 may or may not be meaningless,
 405          * so there's no point in complaining for complaining's sake.
 406          */
 407         if (offset < 0) {                       /* back from end of month */
 408                                                 /* FIXME */
 409                 wdayn = d;
 410                 while (wdayn <= yearinfo->monthdays[month])
 411                         wdayn += 7;
 412                 d = offset * 7 + wdayn;
 413         } else if (offset > 0){
 414                 if (d > 0)
 415                         d += offset * 7 - 7;
 416                 else
 417                         d += offset * 7;
 418         } else
 419                 warnx ("Invalid offset 0");
 420         return (d);
 421 }
 422
 423 /*
 424  * Possible date formats include any combination of:
 425  *      3-charmonth                     (January, Jan, Jan)
 426  *      3-charweekday                   (Friday, Monday, mon.)
 427  *      numeric month or day            (1, 2, 04)
 428  *
 429  * Any character may separate them, or they may not be separated.  Any line,
 430  * following a line that is matched, that starts with "whitespace", is shown
 431  * along with the matched line.
 432  */
 433 int
 434 parsedaymonth(char *date, int *yearp, int *monthp, int *dayp, int *flags,
 435     char **edp)
 436 {
 437         char month[100], dayofmonth[100], dayofweek[100], modifieroffset[100];
 438         char syear[100];
 439         char modifierindex[100], specialday[100];
 440         int idayofweek = -1, imonth = -1, idayofmonth = -1, iyear = -1;
 441         int year, remindex;
 442         int d, m, dow, rm, rd, offset;
 443         char *ed;
 444         int retvalsign = 1;
 445
 446         /*
 447          * CONVENTION
 448          *
 449          * Month:     1-12
 450          * Monthname: Jan .. Dec
 451          * Day:       1-31
 452          * Weekday:   Mon .. Sun
 453          *
 454          */
 455
 456         *flags = 0;
 457
 458         if (debug)
 459                 debug_determinestyle(1, date, *flags, month, imonth,
 460                     dayofmonth, idayofmonth, dayofweek, idayofweek,
 461                     modifieroffset, modifierindex, specialday, syear, iyear);
 462         if (determinestyle(date, flags, month, &imonth, dayofmonth,
 463                 &idayofmonth, dayofweek, &idayofweek, modifieroffset,
 464                 modifierindex, specialday, syear, &iyear) == 0) {
 465                 if (debug)
 466                         printf("Failed!\n");
 467                 return (0);
 468         }
 469
 470         if (debug)
 471                 debug_determinestyle(0, date, *flags, month, imonth,
 472                     dayofmonth, idayofmonth, dayofweek, idayofweek,
 473                     modifieroffset, modifierindex, specialday, syear, iyear);
 474
 475         remindex = 0;
 476         for (year = year1; year <= year2; year++) {
 477
 478                 int lflags = *flags;
 479                 /* If the year is specified, only do it if it is this year! */
 480                 if ((lflags & F_YEAR) != 0)
 481                         if (iyear != year)
 482                                 continue;
 483                 lflags &= ~F_YEAR;
 484
 485                 /* Get important dates for this year */
 486                 yearinfo = years;
 487                 while (yearinfo != NULL) {
 488                         if (yearinfo->year == year)
 489                                 break;
 490                         yearinfo = yearinfo -> next;
 491                 }
 492                 if (yearinfo == NULL) {
 493                         yearinfo = (struct yearinfo *)calloc(1,
 494                             sizeof(struct yearinfo));
 495                         if (yearinfo == NULL)
 496                                 errx(1, "Unable to allocate more years");
 497                         yearinfo->year = year;
 498                         yearinfo->next = years;
 499                         years = yearinfo;
 500
 501                         yearinfo->monthdays = monthdaytab[isleap(year)];
 502                         yearinfo->ieaster = easter(year);
 503                         yearinfo->ipaskha = paskha(year);
 504                         fpom(year, UTCOffset, yearinfo->ffullmoon,
 505                             yearinfo->fnewmoon);
 506                         fpom(year, UTCOFFSET_CNY, yearinfo->ffullmooncny,
 507                             yearinfo->fnewmooncny);
 508                         fequinoxsolstice(year, UTCOffset,
 509                             yearinfo->equinoxdays, yearinfo->solsticedays);
 510
 511                         /*
 512                          * CNY: Match day with sun longitude at 330` with new
 513                          * moon
 514                          */
 515                         yearinfo->firstcnyday = calculatesunlongitude30(year,
 516                             UTCOFFSET_CNY, yearinfo->ichinesemonths);
 517                         for (m = 0; yearinfo->fnewmooncny[m] >= 0; m++) {
 518                                 if (yearinfo->fnewmooncny[m] >
 519                                     yearinfo->firstcnyday) {
 520                                         yearinfo->firstcnyday =
 521                                             floor(yearinfo->fnewmooncny[m - 1]);
 522                                         break;
 523                                 }
 524                         }
 525                 }
 526
 527                 /* Same day every year */
 528                 if (lflags == (F_MONTH | F_DAYOFMONTH)) {
 529                         if (!remember_ymd(year, imonth, idayofmonth))
 530                                 continue;
 531                         remember(&remindex, yearp, monthp, dayp, edp,
 532                             year, imonth, idayofmonth, NULL);
 533                         continue;
 534                 }
 535
 536                 /* XXX Same day every year, but variable */
 537                 if (lflags == (F_MONTH | F_DAYOFMONTH | F_VARIABLE)) {
 538                         if (!remember_ymd(year, imonth, idayofmonth))
 539                                 continue;
 540                         remember(&remindex, yearp, monthp, dayp, edp,
 541                             year, imonth, idayofmonth, NULL);
 542                         continue;
 543                 }
 544
 545                 /* Same day every month */
 546                 if (lflags == (F_ALLMONTH | F_DAYOFMONTH)) {
 547                         for (m = 1; m <= 12; m++) {
 548                                 if (!remember_ymd(year, m, idayofmonth))
 549                                         continue;
 550                                 remember(&remindex, yearp, monthp, dayp, edp,
 551                                     year, m, idayofmonth, NULL);
 552                         }
 553                         continue;
 554                 }
 555
 556                 /* Every day of a month */
 557                 if (lflags == (F_ALLDAY | F_MONTH)) {
 558                         for (d = 1; d <= yearinfo->monthdays[imonth]; d++) {
 559                                 if (!remember_ymd(year, imonth, d))
 560                                         continue;
 561                                 remember(&remindex, yearp, monthp, dayp, edp,
 562                                     year, imonth, d, NULL);
 563                         }
 564                         continue;
 565                 }
 566
 567                 /* One day of every month */
 568                 if (lflags == (F_ALLMONTH | F_DAYOFWEEK)) {
 569                         for (m = 1; m <= 12; m++) {
 570                                 if (!remember_ymd(year, m, idayofmonth))
 571                                         continue;
 572                                 remember(&remindex, yearp, monthp, dayp, edp,
 573                                     year, m, idayofmonth, NULL);
 574                         }
 575                         continue;
 576                 }
 577
 578                 /* Every dayofweek of the year */
 579                 if (lflags == (F_DAYOFWEEK | F_VARIABLE)) {
 580                         dow = first_dayofweek_of_year(year);
 581                         d = (idayofweek - dow + 8) % 7;
 582                         while (d <= 366) {
 583                                 if (remember_yd(year, d, &rm, &rd))
 584                                         remember(&remindex,
 585                                             yearp, monthp, dayp, edp,
 586                                             year, rm, rd, NULL);
 587                                 d += 7;
 588                         }
 589                         continue;
 590                 }
 591
 592                 /*
 593                  * Every so-manied dayofweek of every month of the year:
 594                  * Thu-3
 595                  */
 596                 if (lflags == (F_DAYOFWEEK | F_MODIFIERINDEX | F_VARIABLE)) {
 597                         offset = indextooffset(modifierindex);
 598
 599                         for (m = 0; m <= 12; m++) {
 600                                 d = wdayom (idayofweek, offset, m, year);
 601                                 if (remember_ymd(year, m, d)) {
 602                                         remember(&remindex,
 603                                             yearp, monthp, dayp, edp,
 604                                             year, m, d, NULL);
 605                                         continue;
 606                                 }
 607                         }
 608                         continue;
 609                 }
 610
 611                 /*
 612                  * A certain dayofweek of a month
 613                  * Jan/Thu-3
 614                  */
 615                 if (lflags ==
 616                     (F_MONTH | F_DAYOFWEEK | F_MODIFIERINDEX | F_VARIABLE)) {
 617                         offset = indextooffset(modifierindex);
 618                         dow = first_dayofweek_of_month(year, imonth);
 619                         d = (idayofweek - dow + 8) % 7;
 620
 621                         if (offset > 0) {
 622                                 while (d <= yearinfo->monthdays[imonth]) {
 623                                         if (--offset == 0
 624                                             && remember_ymd(year, imonth, d)) {
 625                                                 remember(&remindex,
 626                                                     yearp, monthp, dayp, edp,
 627                                                     year, imonth, d, NULL);
 628                                                 continue;
 629                                         }
 630                                         d += 7;
 631                                 }
 632                                 continue;
 633                         }
 634                         if (offset < 0) {
 635                                 while (d <= yearinfo->monthdays[imonth])
 636                                         d += 7;
 637                                 while (offset != 0) {
 638                                         offset++;
 639                                         d -= 7;
 640                                 }
 641                                 if (remember_ymd(year, imonth, d))
 642                                         remember(&remindex,
 643                                             yearp, monthp, dayp, edp,
 644                                             year, imonth, d, NULL);
 645                                 continue;
 646                         }
 647                         continue;
 648                 }
 649
 650                 /* Every dayofweek of the month */
 651                 if (lflags == (F_DAYOFWEEK | F_MONTH | F_VARIABLE)) {
 652                         dow = first_dayofweek_of_month(year, imonth);
 653                         d = (idayofweek - dow + 8) % 7;
 654                         while (d <= yearinfo->monthdays[imonth]) {
 655                                 if (remember_ymd(year, imonth, d))
 656                                         remember(&remindex,
 657                                             yearp, monthp, dayp, edp,
 658                                             year, imonth, d, NULL);
 659                                 d += 7;
 660                         }
 661                         continue;
 662                 }
 663
 664                 /* Easter */
 665                 if ((lflags & ~F_MODIFIEROFFSET) ==
 666                     (F_SPECIALDAY | F_VARIABLE | F_EASTER)) {
 667                         offset = 0;
 668                         if ((lflags & F_MODIFIEROFFSET) != 0)
 669                                 offset = parseoffset(modifieroffset);
 670                         if (remember_yd(year, yearinfo->ieaster + offset,
 671                                 &rm, &rd))
 672                                 remember(&remindex, yearp, monthp, dayp, edp,
 673                                     year, rm, rd, NULL);
 674                         continue;
 675                 }
 676
 677                 /* Paskha */
 678                 if ((lflags & ~F_MODIFIEROFFSET) ==
 679                     (F_SPECIALDAY | F_VARIABLE | F_PASKHA)) {
 680                         offset = 0;
 681                         if ((lflags & F_MODIFIEROFFSET) != 0)
 682                                 offset = parseoffset(modifieroffset);
 683                         if (remember_yd(year, yearinfo->ipaskha + offset,
 684                                 &rm, &rd))
 685                                 remember(&remindex, yearp, monthp, dayp, edp,
 686                                     year, rm, rd, NULL);
 687                         continue;
 688                 }
 689
 690                 /* Chinese New Year */
 691                 if ((lflags & ~F_MODIFIEROFFSET) ==
 692                     (F_SPECIALDAY | F_VARIABLE | F_CNY)) {
 693                         offset = 0;
 694                         if ((lflags & F_MODIFIEROFFSET) != 0)
 695                                 offset = parseoffset(modifieroffset);
 696                         if (remember_yd(year, yearinfo->firstcnyday + offset,
 697                                 &rm, &rd))
 698                                 remember(&remindex, yearp, monthp, dayp, edp,
 699                                     year, rm, rd, NULL);
 700                         continue;
 701                 }
 702
 703                 /* FullMoon */
 704                 if ((lflags & ~F_MODIFIEROFFSET) ==
 705                     (F_SPECIALDAY | F_VARIABLE | F_FULLMOON)) {
 706                         int i;
 707
 708                         offset = 0;
 709                         if ((lflags & F_MODIFIEROFFSET) != 0)
 710                                 offset = parseoffset(modifieroffset);
 711                         for (i = 0; yearinfo->ffullmoon[i] > 0; i++) {
 712                                 if (remember_yd(year,
 713                                         floor(yearinfo->ffullmoon[i]) + offset,
 714                                         &rm, &rd)) {
 715                                         ed = floattotime(
 716                                             yearinfo->ffullmoon[i]);
 717                                         remember(&remindex,
 718                                             yearp, monthp, dayp, edp,
 719                                             year, rm, rd, ed);
 720                                 }
 721                         }
 722                         continue;
 723                 }
 724
 725                 /* NewMoon */
 726                 if ((lflags & ~F_MODIFIEROFFSET) ==
 727                     (F_SPECIALDAY | F_VARIABLE | F_NEWMOON)) {
 728                         int i;
 729
 730                         offset = 0;
 731                         if ((lflags & F_MODIFIEROFFSET) != 0)
 732                                 offset = parseoffset(modifieroffset);
 733                         for (i = 0; yearinfo->ffullmoon[i] > 0; i++) {
 734                                 if (remember_yd(year,
 735                                         floor(yearinfo->fnewmoon[i]) + offset,
 736                                         &rm, &rd)) {
 737                                         ed = floattotime(yearinfo->fnewmoon[i]);
 738                                         remember(&remindex,
 739                                             yearp, monthp, dayp, edp,
 740                                             year, rm, rd, ed);
 741                                 }
 742                         }
 743                         continue;
 744                 }
 745
 746                 /* (Mar|Sep)Equinox */
 747                 if ((lflags & ~F_MODIFIEROFFSET) ==
 748                     (F_SPECIALDAY | F_VARIABLE | F_MAREQUINOX)) {
 749                         offset = 0;
 750                         if ((lflags & F_MODIFIEROFFSET) != 0)
 751                                 offset = parseoffset(modifieroffset);
 752                         if (remember_yd(year, yearinfo->equinoxdays[0] + offset,
 753                                 &rm, &rd)) {
 754                                 ed = floattotime(yearinfo->equinoxdays[0]);
 755                                 remember(&remindex, yearp, monthp, dayp, edp,
 756                                     year, rm, rd, ed);
 757                         }
 758                         continue;
 759                 }
 760                 if ((lflags & ~F_MODIFIEROFFSET) ==
 761                     (F_SPECIALDAY | F_VARIABLE | F_SEPEQUINOX)) {
 762                         offset = 0;
 763                         if ((lflags & F_MODIFIEROFFSET) != 0)
 764                                 offset = parseoffset(modifieroffset);
 765                         if (remember_yd(year, yearinfo->equinoxdays[1] + offset,
 766                             &rm, &rd)) {
 767                                 ed = floattotime(yearinfo->equinoxdays[1]);
 768                                 remember(&remindex, yearp, monthp, dayp, edp,
 769                                     year, rm, rd, ed);
 770                         }
 771                         continue;
 772                 }
 773
 774                 /* (Jun|Dec)Solstice */
 775                 if ((lflags & ~F_MODIFIEROFFSET) ==
 776                     (F_SPECIALDAY | F_VARIABLE | F_JUNSOLSTICE)) {
 777                         offset = 0;
 778                         if ((lflags & F_MODIFIEROFFSET) != 0)
 779                                 offset = parseoffset(modifieroffset);
 780                         if (remember_yd(year,
 781                                 yearinfo->solsticedays[0] + offset, &rm, &rd)) {
 782                                 ed = floattotime(yearinfo->solsticedays[0]);
 783                                 remember(&remindex, yearp, monthp, dayp, edp,
 784                                     year, rm, rd, ed);
 785                         }
 786                         continue;
 787                 }
 788                 if ((lflags & ~F_MODIFIEROFFSET) ==
 789                     (F_SPECIALDAY | F_VARIABLE | F_DECSOLSTICE)) {
 790                         offset = 0;
 791                         if ((lflags & F_MODIFIEROFFSET) != 0)
 792                                 offset = parseoffset(modifieroffset);
 793                         if (remember_yd(year,
 794                                 yearinfo->solsticedays[1] + offset, &rm, &rd)) {
 795                                 ed = floattotime(yearinfo->solsticedays[1]);
 796                                 remember(&remindex, yearp, monthp, dayp, edp,
 797                                     year, rm, rd, ed);
 798                         }
 799                         continue;
 800                 }
 801
 802                 if (debug) {
 803                         printf("Unprocessed:\n");
 804                         debug_determinestyle(2, date, lflags, month, imonth,
 805                             dayofmonth, idayofmonth, dayofweek, idayofweek,
 806                             modifieroffset, modifierindex, specialday, syear,
 807                             iyear);
 808                 }
 809                 retvalsign = -1;
 810         }
 811
 812         if (retvalsign == -1)
 813                 return (-remindex - 1);
 814         else
 815                 return (remindex);
 816 }
 817
 818 static char *
 819 showflags(int flags)
 820 {
 821         static char s[1000];
 822         s[0] = '\0';
 823
 824         if ((flags & F_YEAR) != 0)
 825                 strcat(s, "year ");
 826         if ((flags & F_MONTH) != 0)
 827                 strcat(s, "month ");
 828         if ((flags & F_DAYOFWEEK) != 0)
 829                 strcat(s, "dayofweek ");
 830         if ((flags & F_DAYOFMONTH) != 0)
 831                 strcat(s, "dayofmonth ");
 832         if ((flags & F_MODIFIERINDEX) != 0)
 833                 strcat(s, "modifierindex ");
 834         if ((flags & F_MODIFIEROFFSET) != 0)
 835                 strcat(s, "modifieroffset ");
 836         if ((flags & F_SPECIALDAY) != 0)
 837                 strcat(s, "specialday ");
 838         if ((flags & F_ALLMONTH) != 0)
 839                 strcat(s, "allmonth ");
 840         if ((flags & F_ALLDAY) != 0)
 841                 strcat(s, "allday ");
 842         if ((flags & F_VARIABLE) != 0)
 843                 strcat(s, "variable ");
 844         if ((flags & F_CNY) != 0)
 845                 strcat(s, "chinesenewyear ");
 846         if ((flags & F_PASKHA) != 0)
 847                 strcat(s, "paskha ");
 848         if ((flags & F_EASTER) != 0)
 849                 strcat(s, "easter ");
 850         if ((flags & F_FULLMOON) != 0)
 851                 strcat(s, "fullmoon ");
 852         if ((flags & F_NEWMOON) != 0)
 853                 strcat(s, "newmoon ");
 854         if ((flags & F_MAREQUINOX) != 0)
 855                 strcat(s, "marequinox ");
 856         if ((flags & F_SEPEQUINOX) != 0)
 857                 strcat(s, "sepequinox ");
 858         if ((flags & F_JUNSOLSTICE) != 0)
 859                 strcat(s, "junsolstice ");
 860         if ((flags & F_DECSOLSTICE) != 0)
 861                 strcat(s, "decsolstice ");
 862
 863         return s;
 864 }
 865
 866 static const char *
 867 getmonthname(int i)
 868 {
 869         if (i <= 0 || i > 12)
 870                 return ("");
 871         if (nmonths[i - 1].len != 0 && nmonths[i - 1].name != NULL)
 872                 return (nmonths[i - 1].name);
 873         return (months[i - 1]);
 874 }
 875
 876 static int
 877 checkmonth(char *s, size_t *len, size_t *offset, const char **month)
 878 {
 879         struct fixs *n;
 880         int i;
 881
 882         for (i = 0; fnmonths[i].name != NULL; i++) {
 883                 n = fnmonths + i;
 884                 if (strncasecmp(s, n->name, n->len) == 0) {
 885                         *len = n->len;
 886                         *month = n->name;
 887                         *offset = i + 1;
 888                         return (1);
 889                 }
 890         }
 891         for (i = 0; nmonths[i].name != NULL; i++) {
 892                 n = nmonths + i;
 893                 if (strncasecmp(s, n->name, n->len) == 0) {
 894                         *len = n->len;
 895                         *month = n->name;
 896                         *offset = i + 1;
 897                         return (1);
 898                 }
 899         }
 900         for (i = 0; fmonths[i] != NULL; i++) {
 901                 *len = strlen(fmonths[i]);
 902                 if (strncasecmp(s, fmonths[i], *len) == 0) {
 903                         *month = fmonths[i];
 904                         *offset = i + 1;
 905                         return (1);
 906                 }
 907         }
 908         for (i = 0; months[i] != NULL; i++) {
 909                 if (strncasecmp(s, months[i], 3) == 0) {
 910                         *len = 3;
 911                         *month = months[i];
 912                         *offset = i + 1;
 913                         return (1);
 914                 }
 915         }
 916         return (0);
 917 }
 918
 919 static const char *
 920 getdayofweekname(int i)
 921 {
 922         if (ndays[i].len != 0 && ndays[i].name != NULL)
 923                 return (ndays[i].name);
 924         return (days[i]);
 925 }
 926
 927 static int
 928 checkdayofweek(char *s, size_t *len, size_t *offset, const char **dow)
 929 {
 930         struct fixs *n;
 931         int i;
 932
 933         for (i = 0; fndays[i].name != NULL; i++) {
 934                 n = fndays + i;
 935                 if (strncasecmp(s, n->name, n->len) == 0) {
 936                         *len = n->len;
 937                         *dow = n->name;
 938                         *offset = i;
 939                         return (1);
 940                 }
 941         }
 942         for (i = 0; ndays[i].name != NULL; i++) {
 943                 n = ndays + i;
 944                 if (strncasecmp(s, n->name, n->len) == 0) {
 945                         *len = n->len;
 946                         *dow = n->name;
 947                         *offset = i;
 948                         return (1);
 949                 }
 950         }
 951         for (i = 0; fdays[i] != NULL; i++) {
 952                 *len = strlen(fdays[i]);
 953                 if (strncasecmp(s, fdays[i], *len) == 0) {
 954                         *dow = fdays[i];
 955                         *offset = i;
 956                         return (1);
 957                 }
 958         }
 959         for (i = 0; days[i] != NULL; i++) {
 960                 if (strncasecmp(s, days[i], 3) == 0) {
 961                         *len = 3;
 962                         *dow = days[i];
 963                         *offset = i;
 964                         return (1);
 965                 }
 966         }
 967         return (0);
 968 }
 969
 970 static int
 971 isonlydigits(char *s, int nostar)
 972 {
 973         int i;
 974         for (i = 0; s[i] != '\0'; i++) {
 975                 if (nostar == 0 && s[i] == '*' && s[i + 1] == '\0')
 976                         return 1;
 977                 if (!isdigit((unsigned char)s[i]))
 978                         return (0);
 979         }
 980         return (1);
 981 }
 982
 983 static int
 984 indextooffset(char *s)
 985 {
 986         int i;
 987         struct fixs *n;
 988         char *es;
 989
 990         if (s[0] == '+' || s[0] == '-') {
 991                 i = strtol (s, &es, 10);
 992                 if (*es != '\0')                      /* trailing junk */
 993                         errx (1, "Invalid specifier format: %s\n", s);
 994                 return (i);
 995         }
 996
 997         for (i = 0; i < 6; i++) {
 998                 if (strcasecmp(s, sequences[i]) == 0) {
 999                         if (i == 5)
1000                                 return (-1);
1001                         return (i + 1);
1002                 }
1003         }
1004         for (i = 0; i < 6; i++) {
1005                 n = nsequences + i;
1006                 if (n->len == 0)
1007                         continue;
1008                 if (strncasecmp(s, n->name, n->len) == 0) {
1009                         if (i == 5)
1010                                 return (-1);
1011                         return (i + 1);
1012                 }
1013         }
1014         return (0);
1015 }
1016
1017 static int
1018 parseoffset(char *s)
1019 {
1020         return strtol(s, NULL, 10);
1021 }
1022
1023 static char *
1024 floattotime(double f)
1025 {
1026         static char buf[100];
1027         int hh, mm, ss, i;
1028
1029         f -= floor(f);
1030         i = f * SECSPERDAY;
1031
1032         hh = i / SECSPERHOUR;
1033         i %= SECSPERHOUR;
1034         mm = i / SECSPERMINUTE;
1035         i %= SECSPERMINUTE;
1036         ss = i;
1037
1038         sprintf(buf, "%02d:%02d:%02d", hh, mm, ss);
1039         return (buf);
1040 }
1041
1042 static char *
1043 floattoday(int year, double f)
1044 {
1045         static char buf[100];
1046         int i, m, d, hh, mm, ss;
1047         int *cumdays = cumdaytab[isleap(year)];
1048
1049         for (i = 0; 1 + cumdays[i] < f; i++)
1050                 ;
1051         m = --i;
1052         d = floor(f - 1 - cumdays[i]);
1053         f -= floor(f);
1054         i = f * SECSPERDAY;
1055
1056         hh = i / SECSPERHOUR;
1057         i %= SECSPERHOUR;
1058         mm = i / SECSPERMINUTE;
1059         i %= SECSPERMINUTE;
1060         ss = i;
1061
1062         sprintf(buf, "%02d-%02d %02d:%02d:%02d", m, d, hh, mm, ss);
1063         return (buf);
1064 }
1065
1066 void
1067 dodebug(char *what)
1068 {
1069         int year;
1070
1071         printf("UTCOffset: %g\n", UTCOffset);
1072         printf("eastlongitude: %d\n", EastLongitude);
1073
1074         if (strcmp(what, "moon") == 0) {
1075                 double ffullmoon[MAXMOONS], fnewmoon[MAXMOONS];
1076                 int i;
1077
1078                 for (year = year1; year <= year2; year++) {
1079                         fpom(year, UTCOffset, ffullmoon, fnewmoon);
1080                         printf("Full moon %d:\t", year);
1081                         for (i = 0; ffullmoon[i] >= 0; i++) {
1082                                 printf("%g (%s) ", ffullmoon[i],
1083                                     floattoday(year, ffullmoon[i]));
1084                         }
1085                         printf("\nNew moon %d:\t", year);
1086                         for (i = 0; fnewmoon[i] >= 0; i++) {
1087                                 printf("%g (%s) ", fnewmoon[i],
1088                                     floattoday(year, fnewmoon[i]));
1089                         }
1090                         printf("\n");
1091
1092                 }
1093
1094                 return;
1095         }
1096
1097         if (strcmp(what, "sun") == 0) {
1098                 double equinoxdays[2], solsticedays[2];
1099                 for (year = year1; year <= year2; year++) {
1100                         printf("Sun in %d:\n", year);
1101                         fequinoxsolstice(year, UTCOffset, equinoxdays,
1102                             solsticedays);
1103                         printf("e[0] - %g (%s)\n",
1104                             equinoxdays[0],
1105                             floattoday(year, equinoxdays[0]));
1106                         printf("e[1] - %g (%s)\n",
1107                             equinoxdays[1],
1108                             floattoday(year, equinoxdays[1]));
1109                         printf("s[0] - %g (%s)\n",
1110                             solsticedays[0],
1111                             floattoday(year, solsticedays[0]));
1112                         printf("s[1] - %g (%s)\n",
1113                             solsticedays[1],
1114                             floattoday(year, solsticedays[1]));
1115                 }
1116                 return;
1117         }
1118 }