rom/dos/strtodate.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Converts a string into a date
   6     Lang: english
   7 */
   8 #include <string.h>
   9 #include "dos_intern.h"
  10
  11 #ifdef TEST
  12 #    include <proto/dos.h>
  13 #    include <stdio.h>
  14 #    undef AROS_LH1
  15 #    undef StrToDate
  16 #    undef AROS_LHA
  17 #    define AROS_LH1(ret,name,arg,type,base,offset,libname) \
  18         ret name (arg)
  19 #    define AROS_LHA(type,name,reg) type name
  20
  21 const ULONG Dos_DayTable[]=
  22 {
  23     0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335
  24 };
  25
  26 const char *const Dos_MonthTable[]=
  27 {
  28     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  29     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  30 };
  31
  32 const char *const Dos_WeekTable[]=
  33 {
  34     "Sunday", "Monday", "Tuesday", "Wednesday",
  35     "Thursday", "Friday", "Saturday"
  36 };
  37
  38 const char *const Dos_SubstDateTable[]=
  39 {
  40     "Tomorrow", "Today", "Yesterday"
  41 };
  42 #else
  43 #    include "date.h"
  44 #endif
  45
  46 /*****************************************************************************
  47
  48     NAME */
  49 #include <dos/datetime.h>
  50 #include <proto/dos.h>
  51
  52         AROS_LH1(BOOL, StrToDate,
  53
  54 /*  SYNOPSIS */
  55         AROS_LHA(struct DateTime *, datetime, D1),
  56
  57 /*  LOCATION */
  58         struct DosLibrary *, DOSBase, 125, Dos)
  59
  60 /*  FUNCTION
  61         Converts a human readable ASCII string into an AmigaDOS
  62         DateStamp.
  63
  64     INPUTS
  65         DateTime - a pointer to an initialized DateTime structure.
  66                 The structure should be initialized as follows:
  67
  68                 dat_Stamp: The converted date will be written here
  69
  70                 dat_Format: How to convert the datestamp into
  71                     dat_StrDate. Can be any of the following:
  72
  73                     FORMAT_DOS: AmigaDOS format (dd-mmm-yy). This
  74                             is the default if you specify something other
  75                             than any entry in this list.
  76
  77                     FORMAT_INT: International format (yy-mmm-dd).
  78
  79                     FORMAT_USA: American format (mm-dd-yy).
  80
  81                     FORMAT_CDN: Canadian format (dd-mm-yy).
  82
  83                     FORMAT_DEF: default format for locale.
  84
  85
  86                 dat_Flags: Modifies dat_Format. The only flag
  87                         used by this function is DTF_FUTURE. If set, then
  88                         a string like "Monday" refers to the next monday.
  89                         Otherwise it refers to the last monday.
  90
  91                 dat_StrDay: Ignored.
  92
  93                 dat_StrDate: Pointer to valid string representing the
  94                         date. This can be a "DTF_SUBST" style string such
  95                         as "Today" "Tomorrow" "Monday", or it may be a
  96                         string as specified by the dat_Format byte. This
  97                         will be converted to the ds_Days portion of the
  98                         DateStamp. If this pointer is NULL,
  99                         DateStamp->ds_Days will not be affected.
 100
 101                 dat_StrTime: Pointer to a buffer which contains the
 102                         time in the ASCII format hh:mm:ss. This will be
 103                         converted to the ds_Minutes and ds_Ticks portions
 104                         of the DateStamp.  If this pointer is NULL,
 105                         ds_Minutes and ds_Ticks will be unchanged.
 106
 107
 108     RESULT
 109         A zero return indicates that a conversion could not be performed. A
 110         non-zero return indicates that the DateTime.dat_Stamp variable
 111         contains the converted values.
 112
 113     NOTES
 114
 115     EXAMPLE
 116
 117     BUGS
 118
 119     SEE ALSO
 120         DateStamp(), DateToStr()
 121
 122     INTERNALS
 123
 124 *****************************************************************************/
 125 {
 126     AROS_LIBFUNC_INIT
 127     struct DateStamp curr;
 128     LONG days, min, tick, len, t, year, month;
 129     BOOL leap;
 130     UBYTE * ptr, * format;
 131
 132     if ((ptr = datetime->dat_StrDate))
 133     {
 134         DateStamp (&curr);
 135
 136         for (t=0; t<3; t++)
 137         {
 138             if (!Strnicmp (Dos_SubstDateTable[t], ptr, strlen (Dos_SubstDateTable[t])))
 139                 break;
 140         }
 141
 142         if (t != 3)
 143             days = curr.ds_Days + 1 - t;
 144         else
 145         {
 146             for (t=0; t<7; t++)
 147             {
 148                 if (!Strnicmp (Dos_WeekTable[t], ptr, strlen (Dos_WeekTable[t])))
 149                     break;
 150             }
 151
 152             if (t != 7)
 153             {
 154             #if 1
 155                 LONG diffdays;
 156
 157                 days = curr.ds_Days;
 158
 159                 diffdays = t - (days % 7);
 160
 161                 if (datetime->dat_Flags & DTF_FUTURE)
 162                 {
 163                     if (diffdays > 0)
 164                     {
 165                         days += diffdays;
 166                     }
 167                     else
 168                     {
 169                         days += 7 + diffdays;
 170                     }
 171                 }
 172                 else
 173                 {
 174                     if (diffdays < 0)
 175                     {
 176                         days += diffdays;
 177                     }
 178                     else
 179                     {
 180                         days += diffdays - 7;
 181                     }
 182                 }
 183             #else
 184                 days = curr.ds_Days;
 185
 186                 if ((days % 7) == 0)
 187                     days -= 7;
 188                 else
 189                     days -= (days % 7);
 190
 191                 days += t;
 192
 193                 if (datetime->dat_Flags & DTF_FUTURE)
 194                     days += 7;
 195             #endif
 196             }
 197             else
 198             {
 199                 switch (datetime->dat_Format)
 200                 {
 201                 case FORMAT_INT: format = "y-M-d"; break;
 202                 case FORMAT_USA: format = "m-d-y"; break;
 203                 case FORMAT_CDN: format = "d-m-y"; break;
 204                 default:         format = "d-M-y"; break;
 205                 }
 206
 207                 while (*format)
 208                 {
 209                     switch (*format)
 210                     {
 211                     case 'y':
 212                         t = StrToLong (ptr, &year);
 213
 214                         if (t == -1)
 215                             return DOSFALSE;
 216
 217                         if (year < 100)
 218                             year += 1900;
 219
 220                         ptr += t;
 221
 222                         break;
 223
 224                     case 'M':
 225                         t = StrToLong (ptr, &month);
 226
 227                         if (t == -1)
 228                             return DOSFALSE;
 229
 230                         ptr += t;
 231
 232                         break;
 233
 234                     case 'd':
 235                         t = StrToLong (ptr, &days);
 236
 237                         if (t == -1)
 238                             return DOSFALSE;
 239
 240                         ptr += t;
 241
 242                         break;
 243
 244                     case 'm':
 245                         for (t=0; t<12; t++)
 246                         {
 247                             if (!Strnicmp (Dos_MonthTable[t], ptr,
 248                                     strlen (Dos_MonthTable[t])))
 249                                 break;
 250                         }
 251
 252                         if (t == 12)
 253                             return DOSFALSE;
 254
 255                         month = t+1;
 256
 257                         ptr += strlen (Dos_MonthTable[t]);
 258
 259                         break;
 260
 261                     default:
 262                         if (*ptr != *format)
 263                             return DOSFALSE;
 264
 265                         ptr ++;
 266
 267                         break;
 268
 269                     } /* switch */
 270
 271                     format ++;
 272                 } /* while */
 273
 274                 /* kprintf ("Year=%ld, Month=%ld, Days=%ld\n",
 275                         year, month, days); */
 276
 277                 /* Days go from 1..x */
 278                 days --;
 279
 280                 /* First year must be 1978 */
 281                 if (year < 1978)
 282                     return DOSFALSE;
 283
 284                 /* Is this year a leap year ? */
 285                 leap = (((year % 400) == 0) ||
 286                     (((year % 4) == 0) && !((year % 100) == 0)));
 287
 288                 /* Add the days for all years (without leap years) */
 289                 days += (year - 1978) * 365;
 290
 291 #if 1
 292                 /* stegerg: we do *not* want a day to be added for *this*
 293                    year, if it is a leap year. Only the previous years
 294                    are the ones we want to be taken into account. */
 295
 296                 year--;
 297 #endif
 298
 299                 /* Add leap years */
 300                 days += ((year / 4) - (year / 100) + (year / 400)
 301                     - (494 - 19 + 4));
 302
 303                 //kprintf("strtodate: days1 = %d\n", days);
 304                 /* Add days of months */
 305                 days += Dos_DayTable[month-1];
 306                 //kprintf("strtodate: days2 = %d\n", days);
 307
 308                 /*
 309                     In Dos_DayTable, February has 29 days. Correct this in
 310                     non-leap years and if the day has not yet been reached.
 311                 */
 312
 313 #if 1
 314                 /* stegerg: if this year is *no* leap year, then Dos_DayTable
 315                             is wrong by one day when accessing
 316                             Dos_DayTable[March..Dec] */
 317
 318                 if (!leap && (month >= 3)) days--;
 319 #else
 320                 if (month >= 2 || (leap && month < 2))
 321                     days --;
 322 #endif
 323
 324                 //kprintf("strtodate: days3 = %d\n", days);
 325
 326             } /* Normal date */
 327
 328         } /* Not "Tomorrow", "Today" or "Yesterday" */
 329
 330         datetime->dat_Stamp.ds_Days   = days;
 331
 332     } /* Convert date ? */
 333
 334     if ((ptr = datetime->dat_StrTime))
 335     {
 336         len = StrToLong (ptr, &t);
 337
 338         if ((len == -1) || (t < 0) || (t > 23))
 339             return DOSFALSE;
 340
 341         min = t * 60;
 342
 343         ptr += len;
 344
 345         if (*ptr++ != ':')
 346             return DOSFALSE;
 347
 348         len = StrToLong (ptr, &t);
 349
 350         if ((len == -1) || (t < 0) || (t > 59))
 351             return DOSFALSE;
 352
 353         min += t;
 354
 355         ptr += len;
 356
 357         if (*ptr != '\0')
 358         {
 359             if (*ptr++ != ':')
 360                 return DOSFALSE;
 361
 362             len = StrToLong (ptr, &t);
 363
 364             if ((len == -1) || (t < 0) || (t > 59))
 365                 return DOSFALSE;
 366
 367             tick = t * TICKS_PER_SECOND;
 368         }
 369         else
 370             tick = 0;
 371
 372         datetime->dat_Stamp.ds_Minute = min;
 373         datetime->dat_Stamp.ds_Tick   = tick;
 374
 375     }
 376
 377     return DOSTRUE;
 378     AROS_LIBFUNC_EXIT
 379 } /* StrToDate */
 380
 381 #ifdef TEST
 382 #    include <stdio.h>
 383
 384 int main (int argc, char ** argv)
 385 {
 386     struct DateTime dt;
 387     char * date;
 388     char * time;
 389     char daybuf[LEN_DATSTRING];
 390     char datebuf[LEN_DATSTRING];
 391     char timebuf[LEN_DATSTRING];
 392
 393     if (argc >= 2)
 394         date = argv[1];
 395     else
 396         date = NULL;
 397
 398     if (argc >= 3)
 399         time = argv[2];
 400     else
 401         time = NULL;
 402
 403     dt.dat_StrDate = date;
 404     dt.dat_StrTime = time;
 405     dt.dat_Flags   = 0;
 406     dt.dat_Format  = FORMAT_CDN;
 407
 408     if (!StrToDate (&dt))
 409     {
 410         printf ("Cannot convert date/time\n");
 411         return 10;
 412     }
 413     else
 414     {
 415         printf ("Result: Days=%ld, Minute=%ld, Ticks=%ld\n"
 416             , dt.dat_Stamp.ds_Days
 417             , dt.dat_Stamp.ds_Minute
 418             , dt.dat_Stamp.ds_Tick
 419         );
 420
 421         dt.dat_StrDay  = daybuf;
 422         dt.dat_StrDate = datebuf;
 423         dt.dat_StrTime = timebuf;
 424
 425         DateToStr (&dt);
 426
 427         printf ("Gives: %s, %s %s\n", daybuf, datebuf, timebuf);
 428
 429         dt.dat_Flags   = DTF_SUBST;
 430
 431         DateToStr (&dt);
 432
 433         printf ("(With DTF_SUBST): %s, %s %s\n", daybuf, datebuf, timebuf);
 434
 435     }
 436
 437     return 0;
 438 } /* main */
 439
 440 #endif /* TEST */