| 1 |
|
|---|
| 2 | /*
|
|---|
| 3 | *@@sourcefile datetime.c:
|
|---|
| 4 | * contains various date and time helper functions.
|
|---|
| 5 | * Some functions in here are OS/2-specific, others
|
|---|
| 6 | * are plain C code.
|
|---|
| 7 | *
|
|---|
| 8 | * Functions marked with (C) Ray Gardner are from
|
|---|
| 9 | * "scaldate.c":
|
|---|
| 10 | * scalar date routines -- public domain by Ray Gardner
|
|---|
| 11 | * These will work over the range 1/01/01 thru 14699/12/31
|
|---|
| 12 | *
|
|---|
| 13 | * Usage: All OS/2 programs.
|
|---|
| 14 | *
|
|---|
| 15 | * Function prefixes (new with V0.81):
|
|---|
| 16 | * -- dat* date/time helper functions
|
|---|
| 17 | *
|
|---|
| 18 | * Note: Version numbering in this file relates to XWorkplace version
|
|---|
| 19 | * numbering.
|
|---|
| 20 | *
|
|---|
| 21 | *@@header "helpers\datetime.h"
|
|---|
| 22 | *@@added V0.9.0 [umoeller]
|
|---|
| 23 | */
|
|---|
| 24 |
|
|---|
| 25 | /*
|
|---|
| 26 | * This file Copyright (C) 1997-2000 Ulrich Mller.
|
|---|
| 27 | * This file is part of the "XWorkplace helpers" source package.
|
|---|
| 28 | * This is free software; you can redistribute it and/or modify
|
|---|
| 29 | * it under the terms of the GNU General Public License as published
|
|---|
| 30 | * by the Free Software Foundation, in version 2 as it comes in the
|
|---|
| 31 | * "COPYING" file of the XWorkplace main distribution.
|
|---|
| 32 | * This program is distributed in the hope that it will be useful,
|
|---|
| 33 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 34 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 35 | * GNU General Public License for more details.
|
|---|
| 36 | */
|
|---|
| 37 |
|
|---|
| 38 | #define OS2EMX_PLAIN_CHAR
|
|---|
| 39 | // this is needed for "os2emx.h"; if this is defined,
|
|---|
| 40 | // emx will define PSZ as _signed_ char, otherwise
|
|---|
| 41 | // as unsigned char
|
|---|
| 42 |
|
|---|
| 43 | #define INCL_DOSMISC
|
|---|
| 44 | #include <os2.h>
|
|---|
| 45 |
|
|---|
| 46 | #include <stdio.h>
|
|---|
| 47 |
|
|---|
| 48 | #include "setup.h" // code generation and debugging options
|
|---|
| 49 |
|
|---|
| 50 | #include "helpers\datetime.h"
|
|---|
| 51 |
|
|---|
| 52 | #pragma hdrstop
|
|---|
| 53 |
|
|---|
| 54 | /*
|
|---|
| 55 | *@@category: Helpers\C helpers\Date/time helpers
|
|---|
| 56 | */
|
|---|
| 57 |
|
|---|
| 58 | /*******************************************************************
|
|---|
| 59 | * *
|
|---|
| 60 | * Private declarations *
|
|---|
| 61 | * *
|
|---|
| 62 | ******************************************************************/
|
|---|
| 63 |
|
|---|
| 64 | const char *pcszFormatTimestamp = "%4u%02u%02u%02u%02u%02u%";
|
|---|
| 65 |
|
|---|
| 66 | ULONG G_ulDateScalarFirstCalled = 0;
|
|---|
| 67 |
|
|---|
| 68 | /*
|
|---|
| 69 | *@@ dtGetULongTime:
|
|---|
| 70 | * this returns the current time as a ULONG value (in milliseconds).
|
|---|
| 71 | * Useful for stopping how much time the machine has spent in
|
|---|
| 72 | * a certain function. To do this, simply call this function twice,
|
|---|
| 73 | * and subtract the two values, which will give you the execution
|
|---|
| 74 | * time in milliseconds.
|
|---|
| 75 | *
|
|---|
| 76 | * A ULONG can hold a max value of 4'294'967'295.
|
|---|
| 77 | * So this overflows after 49.71... days.
|
|---|
| 78 | *
|
|---|
| 79 | *@@V0.9.7 (2000-12-08) [umoeller]: replaced, now using DosQuerySysInfo(QSV_MS_COUNT)
|
|---|
| 80 | */
|
|---|
| 81 |
|
|---|
| 82 | ULONG dtGetULongTime(VOID)
|
|---|
| 83 | {
|
|---|
| 84 | ULONG ulTimeNow;
|
|---|
| 85 | DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT,
|
|---|
| 86 | &ulTimeNow,
|
|---|
| 87 | sizeof(ulTimeNow));
|
|---|
| 88 | return (ulTimeNow);
|
|---|
| 89 |
|
|---|
| 90 | /* DATETIME dt;
|
|---|
| 91 | ULONG ulHours,
|
|---|
| 92 | ulDaysPassed = 0;
|
|---|
| 93 |
|
|---|
| 94 | if (G_ulDateScalarFirstCalled == 0)
|
|---|
| 95 | {
|
|---|
| 96 | // first call:
|
|---|
| 97 | G_ulDateScalarFirstCalled = dtDate2Scalar(dt.year,
|
|---|
| 98 | dt.month,
|
|---|
| 99 | dt.day);
|
|---|
| 100 | }
|
|---|
| 101 | else
|
|---|
| 102 | {
|
|---|
| 103 | // not first call:
|
|---|
| 104 | ULONG ulDateScalarNow = dtDate2Scalar(dt.year,
|
|---|
| 105 | dt.month,
|
|---|
| 106 | dt.day);
|
|---|
| 107 | ulDaysPassed = (ulDateScalarNow - G_ulDateScalarFirstCalled);
|
|---|
| 108 | _Pmpf((__FUNCTION__ ": days passed = %d", ulDaysPassed));
|
|---|
| 109 | }
|
|---|
| 110 |
|
|---|
| 111 | DosGetDateTime(&dt);
|
|---|
| 112 | ulHours = dt.hours; // this is UCHAR in DATETIME
|
|---|
| 113 | // get the hours; for every day passed, add 24 hours...
|
|---|
| 114 | ulHours += (24 * ulDaysPassed);
|
|---|
| 115 | // 0 if we're still on the first date
|
|---|
| 116 |
|
|---|
| 117 | return (10*(dt.hundredths + 100*(dt.seconds + 60*(dt.minutes + 60*(ulHours))))); */
|
|---|
| 118 | }
|
|---|
| 119 |
|
|---|
| 120 | /*
|
|---|
| 121 | *@@ dtCreateFileTimeStamp:
|
|---|
| 122 | * this creates a time stamp string in pszTimeStamp
|
|---|
| 123 | * from the given FDATE and FTIME structures (which
|
|---|
| 124 | * are, for example, used in the FILESTATUS3 structure
|
|---|
| 125 | * returned by DosQueryPathInfo).
|
|---|
| 126 | *
|
|---|
| 127 | * The time stamp string is exactly 15 bytes in length
|
|---|
| 128 | * (including the terminating null byte) and has the
|
|---|
| 129 | * following format:
|
|---|
| 130 | + YYYYMMDDhhmmss
|
|---|
| 131 | * (being year, mondth, day, hours, minutes, seconds).
|
|---|
| 132 | * Your buffer must be large enough for that, this is
|
|---|
| 133 | * not checked.
|
|---|
| 134 | *
|
|---|
| 135 | * This time stamp can be used to compare two dates
|
|---|
| 136 | * simply by calling strcmp.
|
|---|
| 137 | *
|
|---|
| 138 | * Note that since FTIME only has a two-seconds resolution,
|
|---|
| 139 | * the seconds part of the time stamp will have that too.
|
|---|
| 140 | *
|
|---|
| 141 | * This returns the string length (excluding the null
|
|---|
| 142 | * terminator), which should be 14.
|
|---|
| 143 | *
|
|---|
| 144 | *@@added V0.9.0 [umoeller]
|
|---|
| 145 | */
|
|---|
| 146 |
|
|---|
| 147 | int dtCreateFileTimeStamp(PSZ pszTimeStamp, // out: time stamp
|
|---|
| 148 | FDATE* pfdate, // in: date
|
|---|
| 149 | FTIME* pftime) // in: time
|
|---|
| 150 | {
|
|---|
| 151 | return (sprintf(pszTimeStamp,
|
|---|
| 152 | pcszFormatTimestamp,
|
|---|
| 153 | pfdate->year + 1980,
|
|---|
| 154 | pfdate->month,
|
|---|
| 155 | pfdate->day,
|
|---|
| 156 | pftime->hours,
|
|---|
| 157 | pftime->minutes,
|
|---|
| 158 | pftime->twosecs * 2));
|
|---|
| 159 | }
|
|---|
| 160 |
|
|---|
| 161 | /*
|
|---|
| 162 | *@@ dtCreateDosTimeStamp:
|
|---|
| 163 | * just like dtCreateFileTimeStamp,
|
|---|
| 164 | * except that this takes a DATETIME
|
|---|
| 165 | * structure as input. The time stamp
|
|---|
| 166 | * string is exactly the same.
|
|---|
| 167 | *
|
|---|
| 168 | *@@added V0.9.0 [umoeller]
|
|---|
| 169 | */
|
|---|
| 170 |
|
|---|
| 171 | int dtCreateDosTimeStamp(PSZ pszTimeStamp,
|
|---|
| 172 | DATETIME* pdt)
|
|---|
| 173 | {
|
|---|
| 174 | return (sprintf(pszTimeStamp,
|
|---|
| 175 | pcszFormatTimestamp,
|
|---|
| 176 | pdt->year,
|
|---|
| 177 | pdt->month,
|
|---|
| 178 | pdt->day,
|
|---|
| 179 | pdt->hours,
|
|---|
| 180 | pdt->minutes,
|
|---|
| 181 | pdt->seconds));
|
|---|
| 182 | }
|
|---|
| 183 |
|
|---|
| 184 | /*
|
|---|
| 185 | **
|
|---|
| 186 | **
|
|---|
| 187 | ** day: day of month
|
|---|
| 188 | ** mon: month (1-12)
|
|---|
| 189 | ** yr: year
|
|---|
| 190 | **
|
|---|
| 191 | **
|
|---|
| 192 | */
|
|---|
| 193 |
|
|---|
| 194 | /*
|
|---|
| 195 | *@@ dtDayOfWeek:
|
|---|
| 196 | * returns an integer that represents the day of
|
|---|
| 197 | * the week for the date passed as parameters.
|
|---|
| 198 | *
|
|---|
| 199 | * Returns 0-6 where 0 is sunday.
|
|---|
| 200 | *
|
|---|
| 201 | *@@added V0.9.7 (2000-12-05) [umoeller]
|
|---|
| 202 | */
|
|---|
| 203 |
|
|---|
| 204 | ULONG dtDayOfWeek(ULONG day,
|
|---|
| 205 | ULONG mon, // 1-12
|
|---|
| 206 | ULONG yr)
|
|---|
| 207 | {
|
|---|
| 208 | int dow;
|
|---|
| 209 |
|
|---|
| 210 | if (mon <= 2)
|
|---|
| 211 | {
|
|---|
| 212 | mon += 12;
|
|---|
| 213 | yr -= 1;
|
|---|
| 214 | }
|
|---|
| 215 | dow = ( day
|
|---|
| 216 | + mon * 2
|
|---|
| 217 | + ((mon + 1) * 6) / 10
|
|---|
| 218 | + yr
|
|---|
| 219 | + yr / 4
|
|---|
| 220 | - yr / 100
|
|---|
| 221 | + yr / 400
|
|---|
| 222 | + 2);
|
|---|
| 223 | dow = dow % 7;
|
|---|
| 224 | return ((dow ? dow : 7) - 1);
|
|---|
| 225 | }
|
|---|
| 226 |
|
|---|
| 227 | /*
|
|---|
| 228 | *@@ dtIsLeapYear:
|
|---|
| 229 | * returns TRUE if yr is a leap year.
|
|---|
| 230 | *
|
|---|
| 231 | * (c) Ray Gardner.
|
|---|
| 232 | */
|
|---|
| 233 |
|
|---|
| 234 | int dtIsLeapYear(unsigned yr)
|
|---|
| 235 | {
|
|---|
| 236 | return ( (yr % 400 == 0)
|
|---|
| 237 | || ( (yr % 4 == 0)
|
|---|
| 238 | && (yr % 100 != 0)
|
|---|
| 239 | )
|
|---|
| 240 | );
|
|---|
| 241 | }
|
|---|
| 242 |
|
|---|
| 243 | /*
|
|---|
| 244 | *@@ dtMonths2Days:
|
|---|
| 245 | * returns the no. of days for the beginning
|
|---|
| 246 | * of "month" (starting from 1).
|
|---|
| 247 | *
|
|---|
| 248 | * For example, if you pass 1 (for january),
|
|---|
| 249 | * you get 0 because there's no days at jan 1st
|
|---|
| 250 | * yet.
|
|---|
| 251 | *
|
|---|
| 252 | * If you pass 2 (for february), you get 31.
|
|---|
| 253 | *
|
|---|
| 254 | * If you pass 3 (for march), you get 61.
|
|---|
| 255 | *
|
|---|
| 256 | * This is useful for computing a day index
|
|---|
| 257 | * for a given month/day pair. Pass the month
|
|---|
| 258 | * in here and add (day-1); for march 3rd,
|
|---|
| 259 | * you then get 63.
|
|---|
| 260 | *
|
|---|
| 261 | * (c) Ray Gardner.
|
|---|
| 262 | */
|
|---|
| 263 |
|
|---|
| 264 | unsigned dtMonths2Days(unsigned month)
|
|---|
| 265 | {
|
|---|
| 266 | return (month * 3057 - 3007) / 100;
|
|---|
| 267 | }
|
|---|
| 268 |
|
|---|
| 269 | /*
|
|---|
| 270 | *@@ dtYears2Days:
|
|---|
| 271 | * converts a year to the no. of days passed.
|
|---|
| 272 | *
|
|---|
| 273 | * (c) Ray Gardner.
|
|---|
| 274 | */
|
|---|
| 275 |
|
|---|
| 276 | long dtYears2Days (unsigned yr)
|
|---|
| 277 | {
|
|---|
| 278 | return ( yr * 365L
|
|---|
| 279 | + yr / 4
|
|---|
| 280 | - yr / 100
|
|---|
| 281 | + yr / 400);
|
|---|
| 282 | }
|
|---|
| 283 |
|
|---|
| 284 | /*
|
|---|
| 285 | *@@ dtDate2Scalar:
|
|---|
| 286 | * returns a scalar (i.e. the no. of days) for
|
|---|
| 287 | * the given date.
|
|---|
| 288 | *
|
|---|
| 289 | * (c) Ray Gardner.
|
|---|
| 290 | */
|
|---|
| 291 |
|
|---|
| 292 | long dtDate2Scalar(unsigned yr, // in: year (e.g. 1999)
|
|---|
| 293 | unsigned mo, // in: month (1-12)
|
|---|
| 294 | unsigned day) // in: day (1-31)
|
|---|
| 295 | {
|
|---|
| 296 | long scalar;
|
|---|
| 297 | scalar = day + dtMonths2Days(mo);
|
|---|
| 298 | if ( mo > 2 ) /* adjust if past February */
|
|---|
| 299 | scalar -= dtIsLeapYear(yr) ? 1 : 2;
|
|---|
| 300 | yr--;
|
|---|
| 301 | scalar += dtYears2Days(yr);
|
|---|
| 302 | return scalar;
|
|---|
| 303 | }
|
|---|
| 304 |
|
|---|
| 305 | /*
|
|---|
| 306 | *@@ dtScalar2Date:
|
|---|
| 307 | *
|
|---|
| 308 | *
|
|---|
| 309 | * (c) Ray Gardner.
|
|---|
| 310 | */
|
|---|
| 311 |
|
|---|
| 312 | void dtScalar2Date(long scalar, // in: date scalar
|
|---|
| 313 | unsigned *pyr, // out: year (e.g. 1999)
|
|---|
| 314 | unsigned *pmo, // out: month (1-12)
|
|---|
| 315 | unsigned *pday) // out: day (1-31)
|
|---|
| 316 | {
|
|---|
| 317 | unsigned n; /* compute inverse of dtYears2Days() */
|
|---|
| 318 |
|
|---|
| 319 | for ( n = (unsigned)((scalar * 400L) / 146097); dtYears2Days(n) < scalar;)
|
|---|
| 320 | n++; /* 146097 == dtYears2Days(400) */
|
|---|
| 321 | *pyr = n;
|
|---|
| 322 | n = (unsigned)(scalar - dtYears2Days(n-1));
|
|---|
| 323 | if ( n > 59 ) /* adjust if past February */
|
|---|
| 324 | {
|
|---|
| 325 | n += 2;
|
|---|
| 326 | if ( dtIsLeapYear(*pyr) )
|
|---|
| 327 | n -= n > 62 ? 1 : 2;
|
|---|
| 328 | }
|
|---|
| 329 | *pmo = (n * 100 + 3007) / 3057; /* inverse of dtMonths2Days() */
|
|---|
| 330 | *pday = n - dtMonths2Days(*pmo);
|
|---|
| 331 | }
|
|---|
| 332 |
|
|---|
| 333 | /*
|
|---|
| 334 | *@@ dtIsValidDate:
|
|---|
| 335 | * returns TRUE if the given date is valid.
|
|---|
| 336 | *
|
|---|
| 337 | *@@added V0.9.7 (2000-12-05) [umoeller]
|
|---|
| 338 | */
|
|---|
| 339 |
|
|---|
| 340 | BOOL dtIsValidDate(LONG day, // in: day (1-31)
|
|---|
| 341 | LONG month, // in: month (1-12)
|
|---|
| 342 | ULONG year) // in: year (e.g. 1999)
|
|---|
| 343 | {
|
|---|
| 344 | BOOL brc = FALSE;
|
|---|
| 345 | if (day > 0)
|
|---|
| 346 | {
|
|---|
| 347 | switch( month )
|
|---|
| 348 | {
|
|---|
| 349 | case 1 :
|
|---|
| 350 | case 3 :
|
|---|
| 351 | case 5 :
|
|---|
| 352 | case 7 :
|
|---|
| 353 | case 8 :
|
|---|
| 354 | case 10 :
|
|---|
| 355 | case 12 :
|
|---|
| 356 | if (day <= 31)
|
|---|
| 357 | brc = TRUE;
|
|---|
| 358 | break;
|
|---|
| 359 |
|
|---|
| 360 | case 4 :
|
|---|
| 361 | case 6 :
|
|---|
| 362 | case 9 :
|
|---|
| 363 | case 11 :
|
|---|
| 364 | if (day <= 30)
|
|---|
| 365 | brc = TRUE;
|
|---|
| 366 | break;
|
|---|
| 367 |
|
|---|
| 368 | case 2 :
|
|---|
| 369 | if (day < 29)
|
|---|
| 370 | brc = TRUE;
|
|---|
| 371 | else
|
|---|
| 372 | if (day == 29)
|
|---|
| 373 | if (dtIsLeapYear(year))
|
|---|
| 374 | return 1 ;
|
|---|
| 375 | }
|
|---|
| 376 | }
|
|---|
| 377 | return (brc);
|
|---|
| 378 | }
|
|---|
| 379 |
|
|---|
