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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/usr.bin/calendar/day.c,v 1.27 2007/06/09 05:54:13 grog Exp $
  30  * $DragonFly: src/usr.bin/calendar/day.c,v 1.6 2007/09/24 20:31:44 pavalos Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/uio.h>
  35 #include <ctype.h>
  36 #include <err.h>
  37 #include <locale.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <time.h>
  42
  43 #include "pathnames.h"
  44 #include "calendar.h"
  45
  46 extern struct iovec header[];
  47
  48 struct tm *tp;
  49 static const struct tm tm0;
  50 int *cumdays, yrdays;
  51
  52 static char dayname[10];
  53
  54 /* 1-based month, 0-based days, cumulative */
  55 static int daytab[][14] = {
  56         { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
  57         { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
  58 };
  59
  60 static char const *days[] = {
  61         "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
  62 };
  63
  64 static const char *months[] = {
  65         "jan", "feb", "mar", "apr", "may", "jun",
  66         "jul", "aug", "sep", "oct", "nov", "dec", NULL,
  67 };
  68
  69 static struct fixs fndays[8];         /* full national days names */
  70 static struct fixs ndays[8];          /* short national days names */
  71
  72 static struct fixs fnmonths[13];      /* full national months names */
  73 static struct fixs nmonths[13];       /* short national month names */
  74
  75 void
  76 setnnames(void)
  77 {
  78         char buf[80];
  79         int i, l;
  80         struct tm tm;
  81
  82         for (i = 0; i < 7; i++) {
  83                 tm.tm_wday = i;
  84                 strftime(buf, sizeof(buf), "%a", &tm);
  85                 for (l = strlen(buf);
  86                      l > 0 && isspace((unsigned char)buf[l - 1]);
  87                      l--)
  88                         ;
  89                 buf[l] = '\0';
  90                 if (ndays[i].name != NULL)
  91                         free(ndays[i].name);
  92                 if ((ndays[i].name = strdup(buf)) == NULL)
  93                         errx(EXIT_FAILURE, "cannot allocate memory");
  94                 ndays[i].len = strlen(buf);
  95
  96                 strftime(buf, sizeof(buf), "%A", &tm);
  97                 for (l = strlen(buf);
  98                      l > 0 && isspace((unsigned char)buf[l - 1]);
  99                      l--)
 100                         ;
 101                 buf[l] = '\0';
 102                 if (fndays[i].name != NULL)
 103                         free(fndays[i].name);
 104                 if ((fndays[i].name = strdup(buf)) == NULL)
 105                         errx(EXIT_FAILURE, "cannot allocate memory");
 106                 fndays[i].len = strlen(buf);
 107         }
 108
 109         for (i = 0; i < 12; i++) {
 110                 tm.tm_mon = i;
 111                 strftime(buf, sizeof(buf), "%b", &tm);
 112                 for (l = strlen(buf);
 113                      l > 0 && isspace((unsigned char)buf[l - 1]);
 114                      l--)
 115                         ;
 116                 buf[l] = '\0';
 117                 if (nmonths[i].name != NULL)
 118                         free(nmonths[i].name);
 119                 if ((nmonths[i].name = strdup(buf)) == NULL)
 120                         errx(EXIT_FAILURE, "cannot allocate memory");
 121                 nmonths[i].len = strlen(buf);
 122
 123                 strftime(buf, sizeof(buf), "%B", &tm);
 124                 for (l = strlen(buf);
 125                      l > 0 && isspace((unsigned char)buf[l - 1]);
 126                      l--)
 127                         ;
 128                 buf[l] = '\0';
 129                 if (fnmonths[i].name != NULL)
 130                         free(fnmonths[i].name);
 131                 if ((fnmonths[i].name = strdup(buf)) == NULL)
 132                         errx(EXIT_FAILURE, "cannot allocate memory");
 133                 fnmonths[i].len = strlen(buf);
 134         }
 135 }
 136
 137 void
 138 settime(time_t now)
 139 {
 140         char *oldl, *lbufp;
 141
 142         tp = localtime(&now);
 143         if (isleap(tp->tm_year + 1900)) {
 144                 yrdays = 366;
 145                 cumdays = daytab[1];
 146         } else {
 147                 yrdays = 365;
 148                 cumdays = daytab[0];
 149         }
 150         /* Friday displays Monday's events */
 151         if (f_dayAfter == 0 && f_dayBefore == 0 && Friday != -1)
 152                 f_dayAfter = tp->tm_wday == Friday ? 3 : 1;
 153         header[5].iov_base = dayname;
 154
 155         oldl = NULL;
 156         lbufp = setlocale(LC_TIME, NULL);
 157         if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
 158                 errx(EXIT_FAILURE, "cannot allocate memory");
 159         setlocale(LC_TIME, "C");
 160         header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
 161         setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
 162         if (oldl != NULL)
 163                 free(oldl);
 164
 165         setnnames();
 166 }
 167
 168 /* convert Day[/Month][/Year] into unix time (since 1970)
 169  * Day: two digits, Month: two digits, Year: digits
 170  */
 171 time_t
 172 Mktime(char *dp)
 173 {
 174     time_t t;
 175     int d, m, y;
 176     struct tm tm;
 177
 178     time(&t);
 179     tp = localtime(&t);
 180
 181     tm = tm0;
 182     tm.tm_mday = tp->tm_mday;
 183     tm.tm_mon = tp->tm_mon;
 184     tm.tm_year = tp->tm_year;
 185
 186     switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
 187     case 3:
 188         if (y > 1900)
 189             y -= 1900;
 190         tm.tm_year = y;
 191         /* FALLTHROUGH */
 192     case 2:
 193         tm.tm_mon = m - 1;
 194         /* FALLTHROUGH */
 195     case 1:
 196         tm.tm_mday = d;
 197     }
 198
 199 #ifdef DEBUG
 200     fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
 201            asctime(&tm));
 202 #endif
 203     return(mktime(&tm));
 204 }
 205
 206 /*
 207  * Possible date formats include any combination of:
 208  *      3-charmonth                     (January, Jan, Jan)
 209  *      3-charweekday                   (Friday, Monday, mon.)
 210  *      numeric month or day            (1, 2, 04)
 211  *
 212  * Any character may separate them, or they may not be separated.  Any line,
 213  * following a line that is matched, that starts with "whitespace", is shown
 214  * along with the matched line.
 215  */
 216 int
 217 isnow(char *endp, int *monthp, int *dayp, int *varp)
 218 {
 219         int day, flags, month = 0, v1, v2;
 220
 221         /*
 222          * CONVENTION
 223          *
 224          * Month:     1-12
 225          * Monthname: Jan .. Dec
 226          * Day:       1-31
 227          * Weekday:   Mon-Sun
 228          *
 229          */
 230
 231         flags = 0;
 232
 233         /* read first field */
 234         /* didn't recognize anything, skip it */
 235         if (!(v1 = getfield(endp, &endp, &flags)))
 236                 return (0);
 237
 238         /* Easter or Easter depending days */
 239         if (flags & F_EASTER)
 240             day = v1 - 1; /* days since January 1 [0-365] */
 241
 242          /*
 243           * 1. {Weekday,Day} XYZ ...
 244           *
 245           *    where Day is > 12
 246           */
 247         else if (flags & F_ISDAY || v1 > 12) {
 248
 249                 /* found a day; day: 1-31 or weekday: 1-7 */
 250                 day = v1;
 251
 252                 /* {Day,Weekday} {Month,Monthname} ... */
 253                 /* if no recognizable month, assume just a day alone
 254                  * in other words, find month or use current month */
 255                 if (!(month = getfield(endp, &endp, &flags)))
 256                         month = tp->tm_mon + 1;
 257         }
 258
 259         /* 2. {Monthname} XYZ ... */
 260         else if (flags & F_ISMONTH) {
 261                 month = v1;
 262
 263                 /* Monthname {day,weekday} */
 264                 /* if no recognizable day, assume the first day in month */
 265                 if (!(day = getfield(endp, &endp, &flags)))
 266                         day = 1;
 267         }
 268
 269         /* Hm ... */
 270         else {
 271                 v2 = getfield(endp, &endp, &flags);
 272
 273                 /*
 274                  * {Day} {Monthname} ...
 275                  * where Day <= 12
 276                  */
 277                 if (flags & F_ISMONTH) {
 278                         day = v1;
 279                         month = v2;
 280                         *varp = 0;
 281                 }
 282
 283                 /* {Month} {Weekday,Day} ...  */
 284                 else {
 285                         /* F_ISDAY set, v2 > 12, or no way to tell */
 286                         month = v1;
 287                         /* if no recognizable day, assume the first */
 288                         day = v2 ? v2 : 1;
 289                         *varp = 0;
 290                 }
 291         }
 292
 293         /* convert Weekday into *next*  Day,
 294          * e.g.: 'Sunday' -> 22
 295          *       'SundayLast' -> ??
 296          */
 297         if (flags & F_ISDAY) {
 298 #ifdef DEBUG
 299             fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
 300 #endif
 301
 302             *varp = 1;
 303             /* variable weekday, SundayLast, MondayFirst ... */
 304             if (day < 0 || day >= 10) {
 305
 306                 /* negative offset; last, -4 .. -1 */
 307                 if (day < 0) {
 308                     v1 = day/10 - 1;          /* offset -4 ... -1 */
 309                     day = 10 + (day % 10);    /* day 1 ... 7 */
 310
 311                     /* day, eg '22nd' */
 312                     v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 313
 314                     /* (month length - day) / 7 + 1 */
 315                     if (cumdays[month+1] - cumdays[month] >= v2
 316                         && ((int)((cumdays[month+1] -
 317                                cumdays[month] - v2) / 7) + 1) == -v1)
 318                         /* bingo ! */
 319                         day = v2;
 320
 321                     /* set to yesterday */
 322                     else {
 323                         day = tp->tm_mday - 1;
 324                         if (day == 0)
 325                             return (0);
 326                     }
 327                 }
 328
 329                 /* first, second ... +1 ... +5 */
 330                 else {
 331                     v1 = day/10;        /* offset: +1 (first Sunday) ... */
 332                     day = day % 10;
 333
 334                     /* day, eg '22th' */
 335                     v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 336
 337                     /* Hurrah! matched */
 338                     if (((v2 - 1 + 7) / 7) == v1)
 339                         day = v2;
 340
 341                     /* set to yesterday */
 342                     else {
 343                         day = tp->tm_mday - 1;
 344                         if (day == 0)
 345                             return (0);
 346                     }
 347                 }
 348             }
 349
 350             /* wired */
 351             else {
 352                 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 353                 *varp = 1;
 354             }
 355         }
 356
 357         if (!(flags & F_EASTER)) {
 358             if (day + cumdays[month] > cumdays[month + 1]) {    /* off end of month */
 359                 day -= (cumdays[month + 1] - cumdays[month]);   /* adjust */
 360                 if (++month > 12)                               /* next year */
 361                     month = 1;
 362             }
 363             *monthp = month;
 364             *dayp = day;
 365             day = cumdays[month] + day;
 366         }
 367         else {
 368             for (v1 = 0; day > cumdays[v1]; v1++)
 369                 ;
 370             *monthp = v1 - 1;
 371             *dayp = day - cumdays[v1 - 1];
 372             *varp = 1;
 373         }
 374
 375 #ifdef DEBUG
 376         fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day,
 377                 cumdays[month], tp->tm_yday);
 378 #endif
 379
 380         /* When days before or days after is specified */
 381         /* no year rollover */
 382         if (day >= tp->tm_yday - f_dayBefore &&
 383             day <= tp->tm_yday + f_dayAfter)
 384                 return(1);
 385
 386         /* next year */
 387         if (tp->tm_yday + f_dayAfter >= yrdays) {
 388                 int end = tp->tm_yday + f_dayAfter - yrdays;
 389                 if (day <= end)
 390                         return(1);
 391         }
 392
 393         /* previous year */
 394         if (tp->tm_yday - f_dayBefore < 0) {
 395                 int before = yrdays + (tp->tm_yday - f_dayBefore);
 396                 if (day >= before)
 397                         return(1);
 398         }
 399
 400         return(0);
 401 }
 402
 403
 404 int
 405 getmonth(char *s)
 406 {
 407         const char **p;
 408         struct fixs *n;
 409
 410         for (n = fnmonths; n->name; ++n)
 411                 if (!strncasecmp(s, n->name, n->len))
 412                         return ((n - fnmonths) + 1);
 413         for (n = nmonths; n->name; ++n)
 414                 if (!strncasecmp(s, n->name, n->len))
 415                         return ((n - nmonths) + 1);
 416         for (p = months; *p; ++p)
 417                 if (!strncasecmp(s, *p, 3))
 418                         return ((p - months) + 1);
 419         return(0);
 420 }
 421
 422
 423 int
 424 getday(char *s)
 425 {
 426         const char **p;
 427         struct fixs *n;
 428
 429         for (n = fndays; n->name; ++n)
 430                 if (!strncasecmp(s, n->name, n->len))
 431                         return((n - fndays) + 1);
 432         for (n = ndays; n->name; ++n)
 433                 if (!strncasecmp(s, n->name, n->len))
 434                         return((n - ndays) + 1);
 435         for (p = days; *p; ++p)
 436                 if (!strncasecmp(s, *p, 3))
 437                         return((p - days) + 1);
 438         return(0);
 439 }
 440
 441 /* return offset for variable weekdays
 442  * -1 -> last weekday in month
 443  * +1 -> first weekday in month
 444  * ... etc ...
 445  */
 446 int
 447 getdayvar(char *s)
 448 {
 449         int offs;
 450
 451
 452         offs = strlen(s);
 453
 454
 455         /* Sun+1 or Wednesday-2
 456          *    ^              ^   */
 457
 458         /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
 459         switch(*(s + offs - 2)) {
 460         case '-':
 461             return(-(atoi(s + offs - 1)));
 462         case '+':
 463             return(atoi(s + offs - 1));
 464         }
 465
 466
 467         /*
 468          * some aliases: last, first, second, third, fourth
 469          */
 470
 471         /* last */
 472         if      (offs > 4 && !strcasecmp(s + offs - 4, "last"))
 473             return(-1);
 474         else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
 475             return(+1);
 476         else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
 477             return(+2);
 478         else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
 479             return(+3);
 480         else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
 481             return(+4);
 482
 483
 484         /* no offset detected */
 485         return(0);
 486 }