usr.bin/calendar/day.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/types.h>
  38 #include <sys/uio.h>
  39 #include <ctype.h>
  40 #include <err.h>
  41 #include <locale.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <time.h>
  46
  47 #include "pathnames.h"
  48 #include "calendar.h"
  49
  50 struct tm               *tp;
  51 static const struct tm  tm0;
  52 int                     *cumdays, yrdays;
  53 char                    dayname[10];
  54
  55
  56 /* 1-based month, 0-based days, cumulative */
  57 int     daytab[][14] = {
  58         {0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364},
  59         {0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
  60 };
  61
  62 static char const *days[] = {
  63         "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
  64 };
  65
  66 static const char *months[] = {
  67         "jan", "feb", "mar", "apr", "may", "jun",
  68         "jul", "aug", "sep", "oct", "nov", "dec", NULL,
  69 };
  70
  71 static struct fixs fndays[8];           /* full national days names */
  72 static struct fixs ndays[8];            /* short national days names */
  73
  74 static struct fixs fnmonths[13];        /* full national months names */
  75 static struct fixs nmonths[13];         /* short national month names */
  76
  77
  78 void
  79 setnnames(void)
  80 {
  81         char buf[80];
  82         int i, l;
  83         struct tm tm;
  84
  85         for (i = 0; i < 7; i++) {
  86                 tm.tm_wday = i;
  87                 strftime(buf, sizeof(buf), "%a", &tm);
  88                 for (l = strlen(buf);
  89                      l > 0 && isspace((unsigned char)buf[l - 1]);
  90                      l--)
  91                         ;
  92                 buf[l] = '\0';
  93                 if (ndays[i].name != NULL)
  94                         free(ndays[i].name);
  95                 if ((ndays[i].name = strdup(buf)) == NULL)
  96                         errx(1, "cannot allocate memory");
  97                 ndays[i].len = strlen(buf);
  98
  99                 strftime(buf, sizeof(buf), "%A", &tm);
 100                 for (l = strlen(buf);
 101                      l > 0 && isspace((unsigned char)buf[l - 1]);
 102                      l--)
 103                         ;
 104                 buf[l] = '\0';
 105                 if (fndays[i].name != NULL)
 106                         free(fndays[i].name);
 107                 if ((fndays[i].name = strdup(buf)) == NULL)
 108                         errx(1, "cannot allocate memory");
 109                 fndays[i].len = strlen(buf);
 110         }
 111
 112         for (i = 0; i < 12; i++) {
 113                 tm.tm_mon = i;
 114                 strftime(buf, sizeof(buf), "%b", &tm);
 115                 for (l = strlen(buf);
 116                      l > 0 && isspace((unsigned char)buf[l - 1]);
 117                      l--)
 118                         ;
 119                 buf[l] = '\0';
 120                 if (nmonths[i].name != NULL)
 121                         free(nmonths[i].name);
 122                 if ((nmonths[i].name = strdup(buf)) == NULL)
 123                         errx(1, "cannot allocate memory");
 124                 nmonths[i].len = strlen(buf);
 125
 126                 strftime(buf, sizeof(buf), "%B", &tm);
 127                 for (l = strlen(buf);
 128                      l > 0 && isspace((unsigned char)buf[l - 1]);
 129                      l--)
 130                         ;
 131                 buf[l] = '\0';
 132                 if (fnmonths[i].name != NULL)
 133                         free(fnmonths[i].name);
 134                 if ((fnmonths[i].name = strdup(buf)) == NULL)
 135                         errx(1, "cannot allocate memory");
 136                 fnmonths[i].len = strlen(buf);
 137         }
 138 }
 139
 140 void
 141 settime(time_t now)
 142 {
 143         char *oldl, *lbufp;
 144
 145         tp = localtime(&now);
 146         if (isleap(tp->tm_year + 1900)) {
 147                 yrdays = 366;
 148                 cumdays = daytab[1];
 149         } else {
 150                 yrdays = 365;
 151                 cumdays = daytab[0];
 152         }
 153         /* Friday displays Monday's events */
 154         if (f_dayAfter == 0 && f_dayBefore == 0 && Friday != -1)
 155                 f_dayAfter = tp->tm_wday == Friday ? 3 : 1;
 156         header[5].iov_base = dayname;
 157
 158         oldl = NULL;
 159         lbufp = setlocale(LC_TIME, NULL);
 160         if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
 161                 errx(1, "cannot allocate memory");
 162         (void)setlocale(LC_TIME, "C");
 163         header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
 164         (void)setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
 165         if (oldl != NULL)
 166                 free(oldl);
 167
 168         setnnames();
 169 }
 170
 171 /* convert Day[/Month][/Year] into unix time (since 1970)
 172  * Day: two digits, Month: two digits, Year: digits
 173  */
 174 time_t
 175 Mktime(char *dp)
 176 {
 177         time_t t;
 178         int d, m, y;
 179         struct tm tm;
 180
 181         (void)time(&t);
 182         tp = localtime(&t);
 183
 184         tm = tm0;
 185         tm.tm_mday = tp->tm_mday;
 186         tm.tm_mon = tp->tm_mon;
 187         tm.tm_year = tp->tm_year;
 188
 189         switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
 190         case 3:
 191                 if (y > 1900)
 192                         y -= 1900;
 193                 tm.tm_year = y;
 194                 /* FALLTHROUGH */
 195         case 2:
 196                 tm.tm_mon = m - 1;
 197                 /* FALLTHROUGH */
 198         case 1:
 199                 tm.tm_mday = d;
 200         }
 201
 202 #ifdef DEBUG
 203         fprintf(stderr, "Mktime: %d %d %s\n",
 204             (int)mktime(&tm), (int)t, asctime(&tm));
 205 #endif
 206         return (mktime(&tm));
 207 }
 208
 209 /*
 210  * Possible date formats include any combination of:
 211  *      3-charmonth                     (January, Jan, Jan)
 212  *      3-charweekday                   (Friday, Monday, mon.)
 213  *      numeric month or day            (1, 2, 04)
 214  *
 215  * Any character may separate them, or they may not be separated.  Any line,
 216  * following a line that is matched, that starts with "whitespace", is shown
 217  * along with the matched line.
 218  */
 219 int
 220 isnow(char *endp, int *monthp, int *dayp, int *varp)
 221 {
 222         int day, flags, month = 0, v1, v2;
 223
 224         /*
 225          * CONVENTION
 226          *
 227          * Month:     1-12
 228          * Monthname: Jan .. Dec
 229          * Day:       1-31
 230          * Weekday:   Mon-Sun
 231          *
 232          */
 233
 234         flags = 0;
 235
 236         /* read first field */
 237         /* didn't recognize anything, skip it */
 238         if (!(v1 = getfield(endp, &endp, &flags)))
 239                 return (0);
 240
 241         /* Easter or Easter depending days */
 242         if (flags & F_EASTER)
 243                 day = v1 - 1; /* days since January 1 [0-365] */
 244
 245          /*
 246           * 1. {Weekday,Day} XYZ ...
 247           *
 248           *    where Day is > 12
 249           */
 250         else if (flags & F_ISDAY || v1 > 12) {
 251
 252                 /* found a day; day: 1-31 or weekday: 1-7 */
 253                 day = v1;
 254
 255                 /* {Day,Weekday} {Month,Monthname} ... */
 256                 /* if no recognizable month, assume just a day alone
 257                  * in other words, find month or use current month */
 258                 if (!(month = getfield(endp, &endp, &flags)))
 259                         month = tp->tm_mon + 1;
 260         }
 261
 262         /* 2. {Monthname} XYZ ... */
 263         else if (flags & F_ISMONTH) {
 264                 month = v1;
 265
 266                 /* Monthname {day,weekday} */
 267                 /* if no recognizable day, assume the first day in month */
 268                 if (!(day = getfield(endp, &endp, &flags)))
 269                         day = 1;
 270         }
 271
 272         /* Hm ... */
 273         else {
 274                 v2 = getfield(endp, &endp, &flags);
 275
 276                 /*
 277                  * {Day} {Monthname} ...
 278                  * where Day <= 12
 279                  */
 280                 if (flags & F_ISMONTH) {
 281                         day = v1;
 282                         month = v2;
 283                         *varp = 0;
 284                 }
 285
 286                 /* {Month} {Weekday,Day} ...  */
 287                 else {
 288                         /* F_ISDAY set, v2 > 12, or no way to tell */
 289                         month = v1;
 290                         /* if no recognizable day, assume the first */
 291                         day = v2 ? v2 : 1;
 292                         *varp = 0;
 293                 }
 294         }
 295
 296         /* convert Weekday into *next*  Day,
 297          * e.g.: 'Sunday' -> 22
 298          *       'SundayLast' -> ??
 299          */
 300         if (flags & F_ISDAY) {
 301 #ifdef DEBUG
 302                 fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
 303 #endif
 304
 305                 *varp = 1;
 306                 /* variable weekday, SundayLast, MondayFirst ... */
 307                 if (day < 0 || day >= 10) {
 308
 309                         /* negative offset; last, -4 .. -1 */
 310                         if (day < 0) {
 311                                 v1 = day / 10 - 1;      /* offset -4 ... -1 */
 312                                 day = 10 + (day % 10);  /* day 1 ... 7 */
 313
 314                                 /* day, eg '22nd' */
 315                                 v2 = tp->tm_mday +
 316                                     (((day - 1) - tp->tm_wday + 7) % 7);
 317
 318                                 /* (month length - day) / 7 + 1 */
 319                                 if (cumdays[month + 1] - cumdays[month] >= v2
 320                                     && ((int)((cumdays[month + 1] -
 321                                     cumdays[month] - v2) / 7) + 1) == -v1)
 322                                         day = v2;       /* bingo ! */
 323
 324                                 /* set to yesterday */
 325                                 else {
 326                                         day = tp->tm_mday - 1;
 327                                         if (day == 0)
 328                                                 return (0);
 329                                 }
 330                         }
 331
 332                         /* first, second ... +1 ... +5 */
 333                         else {
 334                                 /* offset: +1 (first Sunday) ... */
 335                                 v1 = day / 10;
 336                                 day = day % 10;
 337
 338                                 /* day, eg '22th' */
 339                                 v2 = tp->tm_mday +
 340                                     (((day - 1) - tp->tm_wday + 7) % 7);
 341
 342                                 /* Hurrah! matched */
 343                                 if (((v2 - 1 + 7) / 7) == v1 )
 344                                         day = v2;
 345
 346                                 else {
 347                                         /* set to yesterday */
 348                                         day = tp->tm_mday - 1;
 349                                         if (day == 0)
 350                                                 return (0);
 351                                 }
 352                         }
 353                 } else {
 354                         /* wired */
 355                         day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 356                         *varp = 1;
 357                 }
 358         }
 359
 360         if (!(flags & F_EASTER)) {
 361                 if (day + cumdays[month] > cumdays[month + 1]) {
 362                         /* off end of month, adjust */
 363                         day -= (cumdays[month + 1] - cumdays[month]);
 364                         /* next year */
 365                         if (++month > 12)
 366                                 month = 1;
 367                 }
 368                 *monthp = month;
 369                 *dayp = day;
 370                 day = cumdays[month] + day;
 371         } else {
 372                 for (v1 = 0; day > cumdays[v1]; v1++)
 373                         ;
 374                 *monthp = v1 - 1;
 375                 *dayp = day - cumdays[v1 - 1];
 376                 *varp = 1;
 377         }
 378
 379 #ifdef DEBUG
 380         fprintf(stderr, "day2: day %d(%d-%d) yday %d\n",
 381             *dayp, day, cumdays[month], tp->tm_yday);
 382 #endif
 383
 384         /* When days before or days after is specified */
 385         /* no year rollover */
 386         if (day >= tp->tm_yday - f_dayBefore &&
 387             day <= tp->tm_yday + f_dayAfter)
 388                 return (1);
 389
 390         /* next year */
 391         if (tp->tm_yday + f_dayAfter >= yrdays) {
 392                 int end = tp->tm_yday + f_dayAfter - yrdays;
 393                 if (day <= end)
 394                         return (1);
 395         }
 396
 397         /* previous year */
 398         if (tp->tm_yday - f_dayBefore < 0) {
 399                 int before = yrdays + (tp->tm_yday - f_dayBefore);
 400                 if (day >= before)
 401                         return (1);
 402         }
 403
 404         return (0);
 405 }
 406
 407
 408 int
 409 getmonth(char *s)
 410 {
 411         const char **p;
 412         struct fixs *n;
 413
 414         for (n = fnmonths; n->name; ++n)
 415                 if (!strncasecmp(s, n->name, n->len))
 416                         return ((n - fnmonths) + 1);
 417         for (n = nmonths; n->name; ++n)
 418                 if (!strncasecmp(s, n->name, n->len))
 419                         return ((n - nmonths) + 1);
 420         for (p = months; *p; ++p)
 421                 if (!strncasecmp(s, *p, 3))
 422                         return ((p - months) + 1);
 423         return (0);
 424 }
 425
 426
 427 int
 428 getday(char *s)
 429 {
 430         const char **p;
 431         struct fixs *n;
 432
 433         for (n = fndays; n->name; ++n)
 434                 if (!strncasecmp(s, n->name, n->len))
 435                         return ((n - fndays) + 1);
 436         for (n = ndays; n->name; ++n)
 437                 if (!strncasecmp(s, n->name, n->len))
 438                         return ((n - ndays) + 1);
 439         for (p = days; *p; ++p)
 440                 if (!strncasecmp(s, *p, 3))
 441                         return ((p - days) + 1);
 442         return (0);
 443 }
 444
 445 /* return offset for variable weekdays
 446  * -1 -> last weekday in month
 447  * +1 -> first weekday in month
 448  * ... etc ...
 449  */
 450 int
 451 getdayvar(char *s)
 452 {
 453         int offs;
 454
 455         offs = strlen(s);
 456
 457         /* Sun+1 or Wednesday-2
 458          *    ^              ^   */
 459
 460         /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
 461         switch (*(s + offs - 2)) {
 462         case '-':
 463                 return (-(atoi(s + offs - 1)));
 464         case '+':
 465                 return (atoi(s + offs - 1));
 466         }
 467
 468         /*
 469          * some aliases: last, first, second, third, fourth
 470          */
 471
 472         /* last */
 473         if      (offs > 4 && !strcasecmp(s + offs - 4, "last"))
 474                 return (-1);
 475         else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
 476                 return (+1);
 477         else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
 478                 return (+2);
 479         else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
 480                 return (+3);
 481         else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
 482                 return (+4);
 483
 484         /* no offset detected */
 485         return (0);
 486 }