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 static void
 316 remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
 317     int dd, char *extra)
 318 {
 319         static int warned = 0;
 320
 321         if (*rememberindex >= MAXCOUNT - 1) {
 322                 if (warned == 0)
 323                         warnx("Index > %d, ignored", MAXCOUNT);
 324                 warned++;
 325                 return;
 326         }
 327         y[*rememberindex] = yy;
 328         m[*rememberindex] = mm;
 329         d[*rememberindex] = dd;
 330         if (extra != NULL)
 331                 strcpy(ed[*rememberindex], extra);
 332         else
 333                 ed[*rememberindex][0] = '\0';
 334         *rememberindex += 1;
 335 }
 336
 337 static void
 338 debug_determinestyle(int dateonly, char *date, int flags, char *month,
 339     int imonth, char *dayofmonth, int idayofmonth, char *dayofweek,
 340     int idayofweek, char *modifieroffset, char *modifierindex, char *specialday,
 341     char *year, int iyear)
 342 {
 343
 344         if (dateonly != 0) {
 345                 printf("-------\ndate: |%s|\n", date);
 346                 if (dateonly == 1)
 347                         return;
 348         }
 349         printf("flags: %x - %s\n", flags, showflags(flags));
 350         if (modifieroffset[0] != '\0')
 351                 printf("modifieroffset: |%s|\n", modifieroffset);
 352         if (modifierindex[0] != '\0')
 353                 printf("modifierindex: |%s|\n", modifierindex);
 354         if (year[0] != '\0')
 355                 printf("year: |%s| (%d)\n", year, iyear);
 356         if (month[0] != '\0')
 357                 printf("month: |%s| (%d)\n", month, imonth);
 358         if (dayofmonth[0] != '\0')
 359                 printf("dayofmonth: |%s| (%d)\n", dayofmonth, idayofmonth);
 360         if (dayofweek[0] != '\0')
 361                 printf("dayofweek: |%s| (%d)\n", dayofweek, idayofweek);
 362         if (specialday[0] != '\0')
 363                 printf("specialday: |%s|\n", specialday);
 364 }
 365
 366 static struct yearinfo {
 367         int year;
 368         int ieaster, ipaskha, firstcnyday;
 369         double ffullmoon[MAXMOONS], fnewmoon[MAXMOONS];
 370         double ffullmooncny[MAXMOONS], fnewmooncny[MAXMOONS];
 371         int ichinesemonths[MAXMOONS];
 372         double equinoxdays[2], solsticedays[2];
 373         int *monthdays;
 374         struct yearinfo *next;
 375 } *years, *yearinfo;
 376
 377 /*
 378  * Calculate dates with offset from weekdays, like Thurs-3, Wed+2, etc.
 379  * day is the day of the week,
 380  * offset the ordinal number of the weekday in the month.
 381  */
 382 static int
 383 wdayom (int day, int offset, int month, int year)
 384 {
 385 /* Weekday of first day in month */
 386         int wday1;                                /* first day of month */
 387 /* Weekday of last day in month */
 388         int wdayn;
 389         int d;
 390
 391         wday1 = first_dayofweek_of_month(year, month);
 392         if (wday1 < 0)                          /* not set */
 393                 return (wday1);
 394         /*
 395          * Date of zeroth or first of our weekday in month, depending on the
 396          * relationship with the first of the month.  The range is -6:6.
 397          */
 398         d = (day - wday1 + 1) % 7;
 399         /*
 400          * Which way are we counting?  Offset 0 is invalid, abs (offset) > 5 is
 401          * meaningless, but that's OK.  Offset 5 may or may not be meaningless,
 402          * so there's no point in complaining for complaining's sake.
 403          */
 404         if (offset < 0) {                       /* back from end of month */
 405                                                 /* FIXME */
 406                 wdayn = d;
 407                 while (wdayn <= yearinfo->monthdays[month])
 408                         wdayn += 7;
 409                 d = offset * 7 + wdayn;
 410         } else if (offset > 0){
 411                 if (d > 0)
 412                         d += offset * 7 - 7;
 413                 else
 414                         d += offset * 7;
 415         } else
 416                 warnx ("Invalid offset 0");
 417         return (d);
 418 }
 419
 420 /*
 421  * Possible date formats include any combination of:
 422  *      3-charmonth                     (January, Jan, Jan)
 423  *      3-charweekday                   (Friday, Monday, mon.)
 424  *      numeric month or day            (1, 2, 04)
 425  *
 426  * Any character may separate them, or they may not be separated.  Any line,
 427  * following a line that is matched, that starts with "whitespace", is shown
 428  * along with the matched line.
 429  */
 430 int
 431 parsedaymonth(char *date, int *yearp, int *monthp, int *dayp, int *flags,
 432     char **edp)
 433 {
 434         char month[100], dayofmonth[100], dayofweek[100], modifieroffset[100];
 435         char syear[100];
 436         char modifierindex[100], specialday[100];
 437         int idayofweek = -1, imonth = -1, idayofmonth = -1, iyear = -1;
 438         int year, remindex;
 439         int d, m, dow, rm, rd, offset;
 440         char *ed;
 441         int retvalsign = 1;
 442
 443         /*
 444          * CONVENTION
 445          *
 446          * Month:     1-12
 447          * Monthname: Jan .. Dec
 448          * Day:       1-31
 449          * Weekday:   Mon .. Sun
 450          *
 451          */
 452
 453         *flags = 0;
 454
 455         if (debug)
 456                 debug_determinestyle(1, date, *flags, month, imonth,
 457                     dayofmonth, idayofmonth, dayofweek, idayofweek,
 458                     modifieroffset, modifierindex, specialday, syear, iyear);
 459         if (determinestyle(date, flags, month, &imonth, dayofmonth,
 460                 &idayofmonth, dayofweek, &idayofweek, modifieroffset,
 461                 modifierindex, specialday, syear, &iyear) == 0) {
 462                 if (debug)
 463                         printf("Failed!\n");
 464                 return (0);
 465         }
 466
 467         if (debug)
 468                 debug_determinestyle(0, date, *flags, month, imonth,
 469                     dayofmonth, idayofmonth, dayofweek, idayofweek,
 470                     modifieroffset, modifierindex, specialday, syear, iyear);
 471
 472         remindex = 0;
 473         for (year = year1; year <= year2; year++) {
 474
 475                 int lflags = *flags;
 476                 /* If the year is specified, only do it if it is this year! */
 477                 if ((lflags & F_YEAR) != 0)
 478                         if (iyear != year)
 479                                 continue;
 480                 lflags &= ~F_YEAR;
 481
 482                 /* Get important dates for this year */
 483                 yearinfo = years;
 484                 while (yearinfo != NULL) {
 485                         if (yearinfo->year == year)
 486                                 break;
 487                         yearinfo = yearinfo -> next;
 488                 }
 489                 if (yearinfo == NULL) {
 490                         yearinfo = (struct yearinfo *)calloc(1,
 491                             sizeof(struct yearinfo));
 492                         if (yearinfo == NULL)
 493                                 errx(1, "Unable to allocate more years");
 494                         yearinfo->year = year;
 495                         yearinfo->next = years;
 496                         years = yearinfo;
 497
 498                         yearinfo->monthdays = monthdaytab[isleap(year)];
 499                         yearinfo->ieaster = easter(year);
 500                         yearinfo->ipaskha = paskha(year);
 501                         fpom(year, UTCOffset, yearinfo->ffullmoon,
 502                             yearinfo->fnewmoon);
 503                         fpom(year, UTCOFFSET_CNY, yearinfo->ffullmooncny,
 504                             yearinfo->fnewmooncny);
 505                         fequinoxsolstice(year, UTCOffset,
 506                             yearinfo->equinoxdays, yearinfo->solsticedays);
 507
 508                         /*
 509                          * CNY: Match day with sun longitude at 330` with new
 510                          * moon
 511                          */
 512                         yearinfo->firstcnyday = calculatesunlongitude30(year,
 513                             UTCOFFSET_CNY, yearinfo->ichinesemonths);
 514                         for (m = 0; yearinfo->fnewmooncny[m] >= 0; m++) {
 515                                 if (yearinfo->fnewmooncny[m] >
 516                                     yearinfo->firstcnyday) {
 517                                         yearinfo->firstcnyday =
 518                                             floor(yearinfo->fnewmooncny[m - 1]);
 519                                         break;
 520                                 }
 521                         }
 522                 }
 523
 524                 /* Same day every year */
 525                 if (lflags == (F_MONTH | F_DAYOFMONTH)) {
 526                         if (!remember_ymd(year, imonth, idayofmonth))
 527                                 continue;
 528                         remember(&remindex, yearp, monthp, dayp, edp,
 529                             year, imonth, idayofmonth, NULL);
 530                         continue;
 531                 }
 532
 533                 /* XXX Same day every year, but variable */
 534                 if (lflags == (F_MONTH | F_DAYOFMONTH | F_VARIABLE)) {
 535                         if (!remember_ymd(year, imonth, idayofmonth))
 536                                 continue;
 537                         remember(&remindex, yearp, monthp, dayp, edp,
 538                             year, imonth, idayofmonth, NULL);
 539                         continue;
 540                 }
 541
 542                 /* Same day every month */
 543                 if (lflags == (F_ALLMONTH | F_DAYOFMONTH)) {
 544                         for (m = 1; m <= 12; m++) {
 545                                 if (!remember_ymd(year, m, idayofmonth))
 546                                         continue;
 547                                 remember(&remindex, yearp, monthp, dayp, edp,
 548                                     year, m, idayofmonth, NULL);
 549                         }
 550                         continue;
 551                 }
 552
 553                 /* Every day of a month */
 554                 if (lflags == (F_ALLDAY | F_MONTH)) {
 555                         for (d = 1; d <= yearinfo->monthdays[imonth]; d++) {
 556                                 if (!remember_ymd(year, imonth, d))
 557                                         continue;
 558                                 remember(&remindex, yearp, monthp, dayp, edp,
 559                                     year, imonth, d, NULL);
 560                         }
 561                         continue;
 562                 }
 563
 564                 /* One day of every month */
 565                 if (lflags == (F_ALLMONTH | F_DAYOFWEEK)) {
 566                         for (m = 1; m <= 12; m++) {
 567                                 if (!remember_ymd(year, m, idayofmonth))
 568                                         continue;
 569                                 remember(&remindex, yearp, monthp, dayp, edp,
 570                                     year, m, idayofmonth, NULL);
 571                         }
 572                         continue;
 573                 }
 574
 575                 /* Every dayofweek of the year */
 576                 if (lflags == (F_DAYOFWEEK | F_VARIABLE)) {
 577                         dow = first_dayofweek_of_year(year);
 578                         if (dow < 0)
 579                                 continue;
 580                         d = (idayofweek - dow + 7) % 7 + 1;
 581                         while (d <= 366) {
 582                                 if (remember_yd(year, d, &rm, &rd))
 583                                         remember(&remindex,
 584                                             yearp, monthp, dayp, edp,
 585                                             year, rm, rd, NULL);
 586                                 d += 7;
 587                         }
 588                         continue;
 589                 }
 590
 591                 /*
 592                  * Every so-manied dayofweek of every month of the year:
 593                  * Thu-3
 594                  */
 595                 if (lflags == (F_DAYOFWEEK | F_MODIFIERINDEX | F_VARIABLE)) {
 596                         offset = indextooffset(modifierindex);
 597
 598                         for (m = 0; m <= 12; m++) {
 599                                 d = wdayom (idayofweek, offset, m, year);
 600                                 if (remember_ymd(year, m, d)) {
 601                                         remember(&remindex,
 602                                             yearp, monthp, dayp, edp,
 603                                             year, m, d, NULL);
 604                                         continue;
 605                                 }
 606                         }
 607                         continue;
 608                 }
 609
 610                 /*
 611                  * A certain dayofweek of a month
 612                  * Jan/Thu-3
 613                  */
 614                 if (lflags ==
 615                     (F_MONTH | F_DAYOFWEEK | F_MODIFIERINDEX | F_VARIABLE)) {
 616                         offset = indextooffset(modifierindex);
 617                         dow = first_dayofweek_of_month(year, imonth);
 618                         if (dow < 0)
 619                                 continue;
 620                         d = (idayofweek - dow + 7) % 7 + 1;
 621
 622                         if (offset > 0) {
 623                                 while (d <= yearinfo->monthdays[imonth]) {
 624                                         if (--offset == 0
 625                                             && remember_ymd(year, imonth, d)) {
 626                                                 remember(&remindex,
 627                                                     yearp, monthp, dayp, edp,
 628                                                     year, imonth, d, NULL);
 629                                                 continue;
 630                                         }
 631                                         d += 7;
 632                                 }
 633                                 continue;
 634                         }
 635                         if (offset < 0) {
 636                                 while (d <= yearinfo->monthdays[imonth])
 637                                         d += 7;
 638                                 while (offset != 0) {
 639                                         offset++;
 640                                         d -= 7;
 641                                 }
 642                                 if (remember_ymd(year, imonth, d))
 643                                         remember(&remindex,
 644                                             yearp, monthp, dayp, edp,
 645                                             year, imonth, d, NULL);
 646                                 continue;
 647                         }
 648                         continue;
 649                 }
 650
 651                 /* Every dayofweek of the month */
 652                 if (lflags == (F_DAYOFWEEK | F_MONTH | F_VARIABLE)) {
 653                         dow = first_dayofweek_of_month(year, imonth);
 654                         if (dow < 0)
 655                                 continue;
 656                         d = (idayofweek - dow + 7) % 7 + 1;
 657                         while (d <= yearinfo->monthdays[imonth]) {
 658                                 if (remember_ymd(year, imonth, d))
 659                                         remember(&remindex,
 660                                             yearp, monthp, dayp, edp,
 661                                             year, imonth, d, NULL);
 662                                 d += 7;
 663                         }
 664                         continue;
 665                 }
 666
 667                 /* Easter */
 668                 if ((lflags & ~F_MODIFIEROFFSET) ==
 669                     (F_SPECIALDAY | F_VARIABLE | F_EASTER)) {
 670                         offset = 0;
 671                         if ((lflags & F_MODIFIEROFFSET) != 0)
 672                                 offset = parseoffset(modifieroffset);
 673                         if (remember_yd(year, yearinfo->ieaster + offset,
 674                                 &rm, &rd))
 675                                 remember(&remindex, yearp, monthp, dayp, edp,
 676                                     year, rm, rd, NULL);
 677                         continue;
 678                 }
 679
 680                 /* Paskha */
 681                 if ((lflags & ~F_MODIFIEROFFSET) ==
 682                     (F_SPECIALDAY | F_VARIABLE | F_PASKHA)) {
 683                         offset = 0;
 684                         if ((lflags & F_MODIFIEROFFSET) != 0)
 685                                 offset = parseoffset(modifieroffset);
 686                         if (remember_yd(year, yearinfo->ipaskha + offset,
 687                                 &rm, &rd))
 688                                 remember(&remindex, yearp, monthp, dayp, edp,
 689                                     year, rm, rd, NULL);
 690                         continue;
 691                 }
 692
 693                 /* Chinese New Year */
 694                 if ((lflags & ~F_MODIFIEROFFSET) ==
 695                     (F_SPECIALDAY | F_VARIABLE | F_CNY)) {
 696                         offset = 0;
 697                         if ((lflags & F_MODIFIEROFFSET) != 0)
 698                                 offset = parseoffset(modifieroffset);
 699                         if (remember_yd(year, yearinfo->firstcnyday + offset,
 700                                 &rm, &rd))
 701                                 remember(&remindex, yearp, monthp, dayp, edp,
 702                                     year, rm, rd, NULL);
 703                         continue;
 704                 }
 705
 706                 /* FullMoon */
 707                 if ((lflags & ~F_MODIFIEROFFSET) ==
 708                     (F_SPECIALDAY | F_VARIABLE | F_FULLMOON)) {
 709                         int i;
 710
 711                         offset = 0;
 712                         if ((lflags & F_MODIFIEROFFSET) != 0)
 713                                 offset = parseoffset(modifieroffset);
 714                         for (i = 0; yearinfo->ffullmoon[i] > 0; i++) {
 715                                 if (remember_yd(year,
 716                                         floor(yearinfo->ffullmoon[i]) + offset,
 717                                         &rm, &rd)) {
 718                                         ed = floattotime(
 719                                             yearinfo->ffullmoon[i]);
 720                                         remember(&remindex,
 721                                             yearp, monthp, dayp, edp,
 722                                             year, rm, rd, ed);
 723                                 }
 724                         }
 725                         continue;
 726                 }
 727
 728                 /* NewMoon */
 729                 if ((lflags & ~F_MODIFIEROFFSET) ==
 730                     (F_SPECIALDAY | F_VARIABLE | F_NEWMOON)) {
 731                         int i;
 732
 733                         offset = 0;
 734                         if ((lflags & F_MODIFIEROFFSET) != 0)
 735                                 offset = parseoffset(modifieroffset);
 736                         for (i = 0; yearinfo->ffullmoon[i] > 0; i++) {
 737                                 if (remember_yd(year,
 738                                         floor(yearinfo->fnewmoon[i]) + offset,
 739                                         &rm, &rd)) {
 740                                         ed = floattotime(yearinfo->fnewmoon[i]);
 741                                         remember(&remindex,
 742                                             yearp, monthp, dayp, edp,
 743                                             year, rm, rd, ed);
 744                                 }
 745                         }
 746                         continue;
 747                 }
 748
 749                 /* (Mar|Sep)Equinox */
 750                 if ((lflags & ~F_MODIFIEROFFSET) ==
 751                     (F_SPECIALDAY | F_VARIABLE | F_MAREQUINOX)) {
 752                         offset = 0;
 753                         if ((lflags & F_MODIFIEROFFSET) != 0)
 754                                 offset = parseoffset(modifieroffset);
 755                         if (remember_yd(year, yearinfo->equinoxdays[0] + offset,
 756                                 &rm, &rd)) {
 757                                 ed = floattotime(yearinfo->equinoxdays[0]);
 758                                 remember(&remindex, yearp, monthp, dayp, edp,
 759                                     year, rm, rd, ed);
 760                         }
 761                         continue;
 762                 }
 763                 if ((lflags & ~F_MODIFIEROFFSET) ==
 764                     (F_SPECIALDAY | F_VARIABLE | F_SEPEQUINOX)) {
 765                         offset = 0;
 766                         if ((lflags & F_MODIFIEROFFSET) != 0)
 767                                 offset = parseoffset(modifieroffset);
 768                         if (remember_yd(year, yearinfo->equinoxdays[1] + offset,
 769                             &rm, &rd)) {
 770                                 ed = floattotime(yearinfo->equinoxdays[1]);
 771                                 remember(&remindex, yearp, monthp, dayp, edp,
 772                                     year, rm, rd, ed);
 773                         }
 774                         continue;
 775                 }
 776
 777                 /* (Jun|Dec)Solstice */
 778                 if ((lflags & ~F_MODIFIEROFFSET) ==
 779                     (F_SPECIALDAY | F_VARIABLE | F_JUNSOLSTICE)) {
 780                         offset = 0;
 781                         if ((lflags & F_MODIFIEROFFSET) != 0)
 782                                 offset = parseoffset(modifieroffset);
 783                         if (remember_yd(year,
 784                                 yearinfo->solsticedays[0] + offset, &rm, &rd)) {
 785                                 ed = floattotime(yearinfo->solsticedays[0]);
 786                                 remember(&remindex, yearp, monthp, dayp, edp,
 787                                     year, rm, rd, ed);
 788                         }
 789                         continue;
 790                 }
 791                 if ((lflags & ~F_MODIFIEROFFSET) ==
 792                     (F_SPECIALDAY | F_VARIABLE | F_DECSOLSTICE)) {
 793                         offset = 0;
 794                         if ((lflags & F_MODIFIEROFFSET) != 0)
 795                                 offset = parseoffset(modifieroffset);
 796                         if (remember_yd(year,
 797                                 yearinfo->solsticedays[1] + offset, &rm, &rd)) {
 798                                 ed = floattotime(yearinfo->solsticedays[1]);
 799                                 remember(&remindex, yearp, monthp, dayp, edp,
 800                                     year, rm, rd, ed);
 801                         }
 802                         continue;
 803                 }
 804
 805                 if (debug) {
 806                         printf("Unprocessed:\n");
 807                         debug_determinestyle(2, date, lflags, month, imonth,
 808                             dayofmonth, idayofmonth, dayofweek, idayofweek,
 809                             modifieroffset, modifierindex, specialday, syear,
 810                             iyear);
 811                 }
 812                 retvalsign = -1;
 813         }
 814
 815         if (retvalsign == -1)
 816                 return (-remindex - 1);
 817         else
 818                 return (remindex);
 819 }
 820
 821 static char *
 822 showflags(int flags)
 823 {
 824         static char s[1000];
 825         s[0] = '\0';
 826
 827         if ((flags & F_YEAR) != 0)
 828                 strcat(s, "year ");
 829         if ((flags & F_MONTH) != 0)
 830                 strcat(s, "month ");
 831         if ((flags & F_DAYOFWEEK) != 0)
 832                 strcat(s, "dayofweek ");
 833         if ((flags & F_DAYOFMONTH) != 0)
 834                 strcat(s, "dayofmonth ");
 835         if ((flags & F_MODIFIERINDEX) != 0)
 836                 strcat(s, "modifierindex ");
 837         if ((flags & F_MODIFIEROFFSET) != 0)
 838                 strcat(s, "modifieroffset ");
 839         if ((flags & F_SPECIALDAY) != 0)
 840                 strcat(s, "specialday ");
 841         if ((flags & F_ALLMONTH) != 0)
 842                 strcat(s, "allmonth ");
 843         if ((flags & F_ALLDAY) != 0)
 844                 strcat(s, "allday ");
 845         if ((flags & F_VARIABLE) != 0)
 846                 strcat(s, "variable ");
 847         if ((flags & F_CNY) != 0)
 848                 strcat(s, "chinesenewyear ");
 849         if ((flags & F_PASKHA) != 0)
 850                 strcat(s, "paskha ");
 851         if ((flags & F_EASTER) != 0)
 852                 strcat(s, "easter ");
 853         if ((flags & F_FULLMOON) != 0)
 854                 strcat(s, "fullmoon ");
 855         if ((flags & F_NEWMOON) != 0)
 856                 strcat(s, "newmoon ");
 857         if ((flags & F_MAREQUINOX) != 0)
 858                 strcat(s, "marequinox ");
 859         if ((flags & F_SEPEQUINOX) != 0)
 860                 strcat(s, "sepequinox ");
 861         if ((flags & F_JUNSOLSTICE) != 0)
 862                 strcat(s, "junsolstice ");
 863         if ((flags & F_DECSOLSTICE) != 0)
 864                 strcat(s, "decsolstice ");
 865
 866         return s;
 867 }
 868
 869 static const char *
 870 getmonthname(int i)
 871 {
 872         if (i <= 0 || i > 12)
 873                 return ("");
 874         if (nmonths[i - 1].len != 0 && nmonths[i - 1].name != NULL)
 875                 return (nmonths[i - 1].name);
 876         return (months[i - 1]);
 877 }
 878
 879 static int
 880 checkmonth(char *s, size_t *len, size_t *offset, const char **month)
 881 {
 882         struct fixs *n;
 883         int i;
 884
 885         for (i = 0; fnmonths[i].name != NULL; i++) {
 886                 n = fnmonths + i;
 887                 if (strncasecmp(s, n->name, n->len) == 0) {
 888                         *len = n->len;
 889                         *month = n->name;
 890                         *offset = i + 1;
 891                         return (1);
 892                 }
 893         }
 894         for (i = 0; nmonths[i].name != NULL; i++) {
 895                 n = nmonths + i;
 896                 if (strncasecmp(s, n->name, n->len) == 0) {
 897                         *len = n->len;
 898                         *month = n->name;
 899                         *offset = i + 1;
 900                         return (1);
 901                 }
 902         }
 903         for (i = 0; fmonths[i] != NULL; i++) {
 904                 *len = strlen(fmonths[i]);
 905                 if (strncasecmp(s, fmonths[i], *len) == 0) {
 906                         *month = fmonths[i];
 907                         *offset = i + 1;
 908                         return (1);
 909                 }
 910         }
 911         for (i = 0; months[i] != NULL; i++) {
 912                 if (strncasecmp(s, months[i], 3) == 0) {
 913                         *len = 3;
 914                         *month = months[i];
 915                         *offset = i + 1;
 916                         return (1);
 917                 }
 918         }
 919         return (0);
 920 }
 921
 922 static const char *
 923 getdayofweekname(int i)
 924 {
 925         if (ndays[i].len != 0 && ndays[i].name != NULL)
 926                 return (ndays[i].name);
 927         return (days[i]);
 928 }
 929
 930 static int
 931 checkdayofweek(char *s, size_t *len, size_t *offset, const char **dow)
 932 {
 933         struct fixs *n;
 934         int i;
 935
 936         for (i = 0; fndays[i].name != NULL; i++) {
 937                 n = fndays + i;
 938                 if (strncasecmp(s, n->name, n->len) == 0) {
 939                         *len = n->len;
 940                         *dow = n->name;
 941                         *offset = i;
 942                         return (1);
 943                 }
 944         }
 945         for (i = 0; ndays[i].name != NULL; i++) {
 946                 n = ndays + i;
 947                 if (strncasecmp(s, n->name, n->len) == 0) {
 948                         *len = n->len;
 949                         *dow = n->name;
 950                         *offset = i;
 951                         return (1);
 952                 }
 953         }
 954         for (i = 0; fdays[i] != NULL; i++) {
 955                 *len = strlen(fdays[i]);
 956                 if (strncasecmp(s, fdays[i], *len) == 0) {
 957                         *dow = fdays[i];
 958                         *offset = i;
 959                         return (1);
 960                 }
 961         }
 962         for (i = 0; days[i] != NULL; i++) {
 963                 if (strncasecmp(s, days[i], 3) == 0) {
 964                         *len = 3;
 965                         *dow = days[i];
 966                         *offset = i;
 967                         return (1);
 968                 }
 969         }
 970         return (0);
 971 }
 972
 973 static int
 974 isonlydigits(char *s, int nostar)
 975 {
 976         int i;
 977         for (i = 0; s[i] != '\0'; i++) {
 978                 if (nostar == 0 && s[i] == '*' && s[i + 1] == '\0')
 979                         return 1;
 980                 if (!isdigit((unsigned char)s[i]))
 981                         return (0);
 982         }
 983         return (1);
 984 }
 985
 986 static int
 987 indextooffset(char *s)
 988 {
 989         int i;
 990         struct fixs *n;
 991         char *es;
 992
 993         if (s[0] == '+' || s[0] == '-') {
 994                 i = strtol (s, &es, 10);
 995                 if (*es != '\0')                      /* trailing junk */
 996                         errx (1, "Invalid specifier format: %s\n", s);
 997                 return (i);
 998         }
 999
1000         for (i = 0; i < 6; i++) {
1001                 if (strcasecmp(s, sequences[i]) == 0) {
1002                         if (i == 5)
1003                                 return (-1);
1004                         return (i + 1);
1005                 }
1006         }
1007         for (i = 0; i < 6; i++) {
1008                 n = nsequences + i;
1009                 if (n->len == 0)
1010                         continue;
1011                 if (strncasecmp(s, n->name, n->len) == 0) {
1012                         if (i == 5)
1013                                 return (-1);
1014                         return (i + 1);
1015                 }
1016         }
1017         return (0);
1018 }
1019
1020 static int
1021 parseoffset(char *s)
1022 {
1023         return strtol(s, NULL, 10);
1024 }
1025
1026 static char *
1027 floattotime(double f)
1028 {
1029         static char buf[100];
1030         int hh, mm, ss, i;
1031
1032         f -= floor(f);
1033         i = f * SECSPERDAY;
1034
1035         hh = i / SECSPERHOUR;
1036         i %= SECSPERHOUR;
1037         mm = i / SECSPERMINUTE;
1038         i %= SECSPERMINUTE;
1039         ss = i;
1040
1041         sprintf(buf, "%02d:%02d:%02d", hh, mm, ss);
1042         return (buf);
1043 }
1044
1045 static char *
1046 floattoday(int year, double f)
1047 {
1048         static char buf[100];
1049         int i, m, d, hh, mm, ss;
1050         int *cumdays = cumdaytab[isleap(year)];
1051
1052         for (i = 0; 1 + cumdays[i] < f; i++)
1053                 ;
1054         m = --i;
1055         d = floor(f - 1 - cumdays[i]);
1056         f -= floor(f);
1057         i = f * SECSPERDAY;
1058
1059         hh = i / SECSPERHOUR;
1060         i %= SECSPERHOUR;
1061         mm = i / SECSPERMINUTE;
1062         i %= SECSPERMINUTE;
1063         ss = i;
1064
1065         sprintf(buf, "%02d-%02d %02d:%02d:%02d", m, d, hh, mm, ss);
1066         return (buf);
1067 }
1068
1069 void
1070 dodebug(char *what)
1071 {
1072         int year;
1073
1074         printf("UTCOffset: %g\n", UTCOffset);
1075         printf("eastlongitude: %d\n", EastLongitude);
1076
1077         if (strcmp(what, "moon") == 0) {
1078                 double ffullmoon[MAXMOONS], fnewmoon[MAXMOONS];
1079                 int i;
1080
1081                 for (year = year1; year <= year2; year++) {
1082                         fpom(year, UTCOffset, ffullmoon, fnewmoon);
1083                         printf("Full moon %d:\t", year);
1084                         for (i = 0; ffullmoon[i] >= 0; i++) {
1085                                 printf("%g (%s) ", ffullmoon[i],
1086                                     floattoday(year, ffullmoon[i]));
1087                         }
1088                         printf("\nNew moon %d:\t", year);
1089                         for (i = 0; fnewmoon[i] >= 0; i++) {
1090                                 printf("%g (%s) ", fnewmoon[i],
1091                                     floattoday(year, fnewmoon[i]));
1092                         }
1093                         printf("\n");
1094
1095                 }
1096
1097                 return;
1098         }
1099
1100         if (strcmp(what, "sun") == 0) {
1101                 double equinoxdays[2], solsticedays[2];
1102                 for (year = year1; year <= year2; year++) {
1103                         printf("Sun in %d:\n", year);
1104                         fequinoxsolstice(year, UTCOffset, equinoxdays,
1105                             solsticedays);
1106                         printf("e[0] - %g (%s)\n",
1107                             equinoxdays[0],
1108                             floattoday(year, equinoxdays[0]));
1109                         printf("e[1] - %g (%s)\n",
1110                             equinoxdays[1],
1111                             floattoday(year, equinoxdays[1]));
1112                         printf("s[0] - %g (%s)\n",
1113                             solsticedays[0],
1114                             floattoday(year, solsticedays[0]));
1115                         printf("s[1] - %g (%s)\n",
1116                             solsticedays[1],
1117                             floattoday(year, solsticedays[1]));
1118                 }
1119                 return;
1120         }
1121 }