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 1.13.2.5 2003/04/06 20:04:57 dwmalone Exp $
  34  * $DragonFly: src/usr.bin/calendar/day.c,v 1.5 2006/09/16 18:38:00 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 int *cumdays;
  54
  55 static char dayname[10];
  56 static int offset, yrdays;
  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         offset = 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(EXIT_FAILURE, "cannot allocate memory");
 162         setlocale(LC_TIME, "C");
 163         header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
 164         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     time(&t);
 182     tp = localtime(&t);
 183
 184     tm.tm_sec = 0;
 185     tm.tm_min = 0;
 186     tm.tm_hour = 0;
 187     tm.tm_wday = 0;
 188     tm.tm_mday = tp->tm_mday;
 189     tm.tm_mon = tp->tm_mon;
 190     tm.tm_year = tp->tm_year;
 191
 192     switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
 193     case 3:
 194         if (y > 1900)
 195             y -= 1900;
 196         tm.tm_year = y;
 197         /* FALLTHROUGH */
 198     case 2:
 199         tm.tm_mon = m - 1;
 200         /* FALLTHROUGH */
 201     case 1:
 202         tm.tm_mday = d;
 203     }
 204
 205 #ifdef DEBUG
 206     fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
 207            asctime(&tm));
 208 #endif
 209     return(mktime(&tm));
 210 }
 211
 212 /*
 213  * Possible date formats include any combination of:
 214  *      3-charmonth                     (January, Jan, Jan)
 215  *      3-charweekday                   (Friday, Monday, mon.)
 216  *      numeric month or day            (1, 2, 04)
 217  *
 218  * Any character may separate them, or they may not be separated.  Any line,
 219  * following a line that is matched, that starts with "whitespace", is shown
 220  * along with the matched line.
 221  */
 222 int
 223 isnow(char *endp, int *monthp, int *dayp, int *varp)
 224 {
 225         int day, flags, month = 0, v1, v2;
 226
 227         /*
 228          * CONVENTION
 229          *
 230          * Month:     1-12
 231          * Monthname: Jan .. Dec
 232          * Day:       1-31
 233          * Weekday:   Mon-Sun
 234          *
 235          */
 236
 237         flags = 0;
 238
 239         /* read first field */
 240         /* didn't recognize anything, skip it */
 241         if (!(v1 = getfield(endp, &endp, &flags)))
 242                 return (0);
 243
 244         /* Easter or Easter depending days */
 245         if (flags & F_EASTER)
 246             day = v1 - 1; /* days since January 1 [0-365] */
 247
 248          /*
 249           * 1. {Weekday,Day} XYZ ...
 250           *
 251           *    where Day is > 12
 252           */
 253         else if (flags & F_ISDAY || v1 > 12) {
 254
 255                 /* found a day; day: 1-31 or weekday: 1-7 */
 256                 day = v1;
 257
 258                 /* {Day,Weekday} {Month,Monthname} ... */
 259                 /* if no recognizable month, assume just a day alone
 260                  * in other words, find month or use current month */
 261                 if (!(month = getfield(endp, &endp, &flags)))
 262                         month = tp->tm_mon + 1;
 263         }
 264
 265         /* 2. {Monthname} XYZ ... */
 266         else if (flags & F_ISMONTH) {
 267                 month = v1;
 268
 269                 /* Monthname {day,weekday} */
 270                 /* if no recognizable day, assume the first day in month */
 271                 if (!(day = getfield(endp, &endp, &flags)))
 272                         day = 1;
 273         }
 274
 275         /* Hm ... */
 276         else {
 277                 v2 = getfield(endp, &endp, &flags);
 278
 279                 /*
 280                  * {Day} {Monthname} ...
 281                  * where Day <= 12
 282                  */
 283                 if (flags & F_ISMONTH) {
 284                         day = v1;
 285                         month = v2;
 286                         *varp = 0;
 287                 }
 288
 289                 /* {Month} {Weekday,Day} ...  */
 290                 else {
 291                         /* F_ISDAY set, v2 > 12, or no way to tell */
 292                         month = v1;
 293                         /* if no recognizable day, assume the first */
 294                         day = v2 ? v2 : 1;
 295                         *varp = 0;
 296                 }
 297         }
 298
 299         /* convert Weekday into *next*  Day,
 300          * e.g.: 'Sunday' -> 22
 301          *       'SundayLast' -> ??
 302          */
 303         if (flags & F_ISDAY) {
 304 #ifdef DEBUG
 305             fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
 306 #endif
 307
 308             *varp = 1;
 309             /* variable weekday, SundayLast, MondayFirst ... */
 310             if (day < 0 || day >= 10) {
 311
 312                 /* negative offset; last, -4 .. -1 */
 313                 if (day < 0) {
 314                     v1 = day/10 - 1;          /* offset -4 ... -1 */
 315                     day = 10 + (day % 10);    /* day 1 ... 7 */
 316
 317                     /* day, eg '22nd' */
 318                     v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 319
 320                     /* (month length - day) / 7 + 1 */
 321                     if (cumdays[month+1] - cumdays[month] >= v2
 322                         && ((int)((cumdays[month+1] -
 323                                cumdays[month] - v2) / 7) + 1) == -v1)
 324                         /* bingo ! */
 325                         day = v2;
 326
 327                     /* set to yesterday */
 328                     else {
 329                         day = tp->tm_mday - 1;
 330                         if (day == 0)
 331                             return (0);
 332                     }
 333                 }
 334
 335                 /* first, second ... +1 ... +5 */
 336                 else {
 337                     v1 = day/10;        /* offset: +1 (first Sunday) ... */
 338                     day = day % 10;
 339
 340                     /* day, eg '22th' */
 341                     v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 342
 343                     /* Hurrah! matched */
 344                     if (((v2 - 1 + 7) / 7) == v1)
 345                         day = v2;
 346
 347                     /* set to yesterday */
 348                     else {
 349                         day = tp->tm_mday - 1;
 350                         if (day == 0)
 351                             return (0);
 352                     }
 353                 }
 354             }
 355
 356             /* wired */
 357             else {
 358                 day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
 359                 *varp = 1;
 360             }
 361         }
 362
 363         if (!(flags & F_EASTER)) {
 364             *monthp = month;
 365             *dayp = day;
 366             day = cumdays[month] + day;
 367         }
 368         else {
 369             for (v1 = 0; day > cumdays[v1]; v1++)
 370                 ;
 371             *monthp = v1 - 1;
 372             *dayp = day - cumdays[v1 - 1];
 373             *varp = 1;
 374         }
 375
 376 #ifdef DEBUG
 377         fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday);
 378 #endif
 379         /* if today or today + offset days */
 380         if (day >= tp->tm_yday - f_dayBefore &&
 381             day <= tp->tm_yday + offset + f_dayAfter)
 382                 return(1);
 383
 384         /* if number of days left in this year + days to event in next year */
 385         if (yrdays - tp->tm_yday + day <= offset + f_dayAfter ||
 386             /* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */
 387             tp->tm_yday + day - f_dayBefore < 0
 388             )
 389                 return(1);
 390         return(0);
 391 }
 392
 393
 394 int
 395 getmonth(char *s)
 396 {
 397         const char **p;
 398         struct fixs *n;
 399
 400         for (n = fnmonths; n->name; ++n)
 401                 if (!strncasecmp(s, n->name, n->len))
 402                         return ((n - fnmonths) + 1);
 403         for (n = nmonths; n->name; ++n)
 404                 if (!strncasecmp(s, n->name, n->len))
 405                         return ((n - nmonths) + 1);
 406         for (p = months; *p; ++p)
 407                 if (!strncasecmp(s, *p, 3))
 408                         return ((p - months) + 1);
 409         return(0);
 410 }
 411
 412
 413 int
 414 getday(char *s)
 415 {
 416         const char **p;
 417         struct fixs *n;
 418
 419         for (n = fndays; n->name; ++n)
 420                 if (!strncasecmp(s, n->name, n->len))
 421                         return((n - fndays) + 1);
 422         for (n = ndays; n->name; ++n)
 423                 if (!strncasecmp(s, n->name, n->len))
 424                         return((n - ndays) + 1);
 425         for (p = days; *p; ++p)
 426                 if (!strncasecmp(s, *p, 3))
 427                         return((p - days) + 1);
 428         return(0);
 429 }
 430
 431 /* return offset for variable weekdays
 432  * -1 -> last weekday in month
 433  * +1 -> first weekday in month
 434  * ... etc ...
 435  */
 436 int
 437 getdayvar(char *s)
 438 {
 439         int offs;
 440
 441
 442         offs = strlen(s);
 443
 444
 445         /* Sun+1 or Wednesday-2
 446          *    ^              ^   */
 447
 448         /* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
 449         switch(*(s + offs - 2)) {
 450         case '-':
 451             return(-(atoi(s + offs - 1)));
 452             break;
 453         case '+':
 454             return(atoi(s + offs - 1));
 455             break;
 456         }
 457
 458
 459         /*
 460          * some aliases: last, first, second, third, fourth
 461          */
 462
 463         /* last */
 464         if      (offs > 4 && !strcasecmp(s + offs - 4, "last"))
 465             return(-1);
 466         else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
 467             return(+1);
 468         else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
 469             return(+2);
 470         else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
 471             return(+3);
 472         else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
 473             return(+4);
 474
 475
 476         /* no offset detected */
 477         return(0);
 478 }