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