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  * $FreeBSD: src/usr.bin/calendar/day.c,v 1.27 2007/06/09 05:54:13 grog Exp $
  34  * $DragonFly: src/usr.bin/calendar/day.c,v 1.6 2007/09/24 20:31:44 pavalos Exp $
  35  */
  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 extern struct iovec header[];
  51
  52 struct tm *tp;
  53 static const struct tm tm0;
  54 int *cumdays, yrdays;
  55
  56 static char dayname[10];
  57
  58 /* 1-based month, 0-based days, cumulative */
  59 static int daytab[][14] = {
  60         { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
  61         { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
  62 };
  63
  64 static char const *days[] = {
  65         "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
  66 };
  67
  68 static const char *months[] = {
  69         "jan", "feb", "mar", "apr", "may", "jun",
  70         "jul", "aug", "sep", "oct", "nov", "dec", NULL,
  71 };
  72
  73 static struct fixs fndays[8];         /* full national days names */
  74 static struct fixs ndays[8];          /* short national days names */
  75
  76 static struct fixs fnmonths[13];      /* full national months names */
  77 static struct fixs nmonths[13];       /* short national month names */
  78
  79 void
  80 setnnames(void)
  81 {
  82         char buf[80];
  83         int i, l;
  84         struct tm tm;
  85
  86         for (i = 0; i < 7; i++) {
  87                 tm.tm_wday = i;
  88                 strftime(buf, sizeof(buf), "%a", &tm);
  89                 for (l = strlen(buf);
  90                      l > 0 && isspace((unsigned char)buf[l - 1]);
  91                      l--)
  92                         ;
  93                 buf[l] = '\0';
  94                 if (ndays[i].name != NULL)
  95                         free(ndays[i].name);
  96                 if ((ndays[i].name = strdup(buf)) == NULL)
  97                         errx(EXIT_FAILURE, "cannot allocate memory");
  98                 ndays[i].len = strlen(buf);
  99
 100                 strftime(buf, sizeof(buf), "%A", &tm);
 101                 for (l = strlen(buf);
 102                      l > 0 && isspace((unsigned char)buf[l - 1]);
 103                      l--)
 104                         ;
 105                 buf[l] = '\0';
 106                 if (fndays[i].name != NULL)
 107                         free(fndays[i].name);
 108                 if ((fndays[i].name = strdup(buf)) == NULL)
 109                         errx(EXIT_FAILURE, "cannot allocate memory");
 110                 fndays[i].len = strlen(buf);
 111         }
 112
 113         for (i = 0; i < 12; i++) {
 114                 tm.tm_mon = i;
 115                 strftime(buf, sizeof(buf), "%b", &tm);
 116                 for (l = strlen(buf);
 117                      l > 0 && isspace((unsigned char)buf[l - 1]);
 118                      l--)
 119                         ;
 120                 buf[l] = '\0';
 121                 if (nmonths[i].name != NULL)
 122                         free(nmonths[i].name);
 123                 if ((nmonths[i].name = strdup(buf)) == NULL)
 124                         errx(EXIT_FAILURE, "cannot allocate memory");
 125                 nmonths[i].len = strlen(buf);
 126
 127                 strftime(buf, sizeof(buf), "%B", &tm);
 128                 for (l = strlen(buf);
 129                      l > 0 && isspace((unsigned char)buf[l - 1]);
 130                      l--)
 131                         ;
 132                 buf[l] = '\0';
 133                 if (fnmonths[i].name != NULL)
 134                         free(fnmonths[i].name);
 135                 if ((fnmonths[i].name = strdup(buf)) == NULL)
 136                         errx(EXIT_FAILURE, "cannot allocate memory");
 137                 fnmonths[i].len = strlen(buf);
 138         }
 139 }
 140
 141 void
 142 settime(time_t now)
 143 {
 144         char *oldl, *lbufp;
 145
 146         tp = localtime(&now);
 147         if (isleap(tp->tm_year + 1900)) {
 148                 yrdays = 366;
 149                 cumdays = daytab[1];
 150         } else {
 151                 yrdays = 365;
 152                 cumdays = daytab[0];
 153         }
 154         /* Friday displays Monday's events */
 155         if (f_dayAfter == 0 && f_dayBefore == 0 && Friday != -1)
 156                 f_dayAfter = tp->tm_wday == Friday ? 3 : 1;
 157         header[5].iov_base = dayname;
 158
 159         oldl = NULL;
 160         lbufp = setlocale(LC_TIME, NULL);
 161         if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
 162                 errx(EXIT_FAILURE, "cannot allocate memory");
 163         setlocale(LC_TIME, "C");
 164         header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
 165         setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
 166         if (oldl != NULL)
 167                 free(oldl);
 168
 169         setnnames();
 170 }
 171
 172 /* convert Day[/Month][/Year] into unix time (since 1970)
 173  * Day: two digits, Month: two digits, Year: digits
 174  */
 175 time_t
 176 Mktime(char *dp)
 177 {
 178     time_t t;
 179     int d, m, y;
 180     struct tm tm;
 181
 182     time(&t);
 183     tp = localtime(&t);
 184
 185     tm = tm0;
 186     tm.tm_mday = tp->tm_mday;
 187     tm.tm_mon = tp->tm_mon;
 188     tm.tm_year = tp->tm_year;
 189
 190     switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
 191     case 3:
 192         if (y > 1900)
 193             y -= 1900;
 194         tm.tm_year = y;
 195         /* FALLTHROUGH */
 196     case 2:
 197         tm.tm_mon = m - 1;
 198         /* FALLTHROUGH */
 199     case 1:
 200         tm.tm_mday = d;
 201     }
 202
 203 #ifdef DEBUG
 204     fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
 205            asctime(&tm));
 206 #endif
 207     return(mktime(&tm));
 208 }
 209
 210 /*
 211  * Possible date formats include any combination of:
 212  *      3-charmonth                     (January, Jan, Jan)
 213  *      3-charweekday                   (Friday, Monday, mon.)
 214  *      numeric month or day            (1, 2, 04)
 215  *
 216  * Any character may separate them, or they may not be separated.  Any line,
 217  * following a line that is matched, that starts with "whitespace", is shown
 218  * along with the matched line.
 219  */
 220 int
 221 isnow(char *endp, int *monthp, int *dayp, int *varp)
 222 {
 223         int day, flags, month = 0, v1, v2;
 224
 225         /*
 226          * CONVENTION
 227          *
 228          * Month:     1-12
 229          * Monthname: Jan .. Dec
 230          * Day:       1-31
 231          * Weekday:   Mon-Sun
 232          *
 233          */
 234
 235         flags = 0;
 236
 237         /* read first field */
 238         /* didn't recognize anything, skip it */
 239         if (!(v1 = getfield(endp, &endp, &flags)))
 240                 return (0);
 241
 242         /* Easter or Easter depending days */
 243         if (flags & F_EASTER)
 244             day = v1 - 1; /* days since January 1 [0-365] */
 245
 246          /*
 247           * 1. {Weekday,Day} XYZ ...
 248           *
 249           *    where Day is > 12
 250           */
 251         else if (flags & F_ISDAY || v1 > 12) {
 252
 253                 /* found a day; day: 1-31 or weekday: 1-7 */
 254                 day = v1;
 255
 256                 /* {Day,Weekday} {Month,Monthname} ... */
 257                 /* if no recognizable month, assume just a day alone
 258                  * in other words, find month or use current month */
 259                 if (!(month = getfield(endp, &endp, &flags)))
 260                         month = tp->tm_mon + 1;
 261         }
 262
 263         /* 2. {Monthname} XYZ ... */
 264         else if (flags & F_ISMONTH) {
 265                 month = v1;
 266
 267                 /* Monthname {day,weekday} */
 268                 /* if no recognizable day, assume the first day in month */
 269                 if (!(day = getfield(endp, &endp, &flags)))
 270                         day = 1;
 271         }
 272
 273         /* Hm ... */
 274         else {
 275                 v2 = getfield(endp, &endp, &flags);
 276
 277                 /*
 278                  * {Day} {Monthname} ...
 279                  * where Day <= 12
 280                  */
 281                 if (flags & F_ISMONTH) {
 282                         day = v1;
 283                         month = v2;
 284                         *varp = 0;
 285                 }
 286
 287                 /* {Month} {Weekday,Day} ...  */
 288                 else {
 289                         /* F_ISDAY set, v2 > 12, or no way to tell */
 290                         month = v1;
 291                         /* if no recognizable day, assume the first */
 292                         day = v2 ? v2 : 1;
 293                         *varp = 0;
 294                 }
 295         }
 296
 297         /* convert Weekday into *next*  Day,
 298          * e.g.: 'Sunday' -> 22
 299          *       'SundayLast' -> ??
 300          */
 301         if (flags & F_ISDAY) {
 302 #ifdef DEBUG
 303             fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
 304 #endif
 305
 306             *varp = 1;
 307             /* variable weekday, SundayLast, MondayFirst ... */
 308             if (day < 0 || day >= 10) {
 309
 310                 /* negative offset; last, -4 .. -1 */
 311                 if (day < 0) {
 312                     v1 = day/10 - 1;          /* offset -4 ... -1 */
 313                     day = 10 + (day % 10);    /* day 1 ... 7 */
 314
 315                     /* day, eg '22nd' */
 316                     v2 = tp->tm_mday + (((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                         /* bingo ! */
 323                         day = v2;
 324
 325                     /* set to yesterday */
 326                     else {
 327                         day = tp->tm_mday - 1;
 328                         if (day == 0)
 329                             return (0);
 330                     }
 331                 }
 332
 333                 /* first, second ... +1 ... +5 */
 334                 else {
 335                     v1 = day/10;        /* offset: +1 (first Sunday) ... */
 336                     day = day % 10;
 337
 338                     /* day, eg '22th' */
 339                     v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 340
 341                     /* Hurrah! matched */
 342                     if (((v2 - 1 + 7) / 7) == v1)
 343                         day = v2;
 344
 345                     /* set to yesterday */
 346                     else {
 347                         day = tp->tm_mday - 1;
 348                         if (day == 0)
 349                             return (0);
 350                     }
 351                 }
 352             }
 353
 354             /* wired */
 355             else {
 356                 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 357                 *varp = 1;
 358             }
 359         }
 360
 361         if (!(flags & F_EASTER)) {
 362             if (day + cumdays[month] > cumdays[month + 1]) {    /* off end of month */
 363                 day -= (cumdays[month + 1] - cumdays[month]);   /* adjust */
 364                 if (++month > 12)                               /* next year */
 365                     month = 1;
 366             }
 367             *monthp = month;
 368             *dayp = day;
 369             day = cumdays[month] + day;
 370         }
 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", *dayp, day,
 381                 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
 456         offs = strlen(s);
 457
 458
 459         /* Sun+1 or Wednesday-2
 460          *    ^              ^   */
 461
 462         /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
 463         switch(*(s + offs - 2)) {
 464         case '-':
 465             return(-(atoi(s + offs - 1)));
 466         case '+':
 467             return(atoi(s + offs - 1));
 468         }
 469
 470
 471         /*
 472          * some aliases: last, first, second, third, fourth
 473          */
 474
 475         /* last */
 476         if      (offs > 4 && !strcasecmp(s + offs - 4, "last"))
 477             return(-1);
 478         else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
 479             return(+1);
 480         else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
 481             return(+2);
 482         else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
 483             return(+3);
 484         else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
 485             return(+4);
 486
 487
 488         /* no offset detected */
 489         return(0);
 490 }