datetime.c

Linux 上的socket嗅探器

/*
 *
 * Copyright (C) 2003 Xiangbin Lee <[e-mail]> <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation.
 */

#include "datetime.h"

#ifndef EQ
    #define EQ ==
#endif

void DT_CopyDateTime(DT_DATE_TIME *thisdat, DT_DATE_TIME nextdat)
{
    thisdat->year=nextdat.year;
    thisdat->month=nextdat.month;
    thisdat->day=nextdat.day;
    thisdat->hour=nextdat.hour;
    thisdat->minute=nextdat.minute;
    thisdat->second=nextdat.second;
}
////////////////////////////////////////
// check day
unsigned char DT_GetMaxDay(unsigned short year, unsigned char month)
{
    unsigned char ifrun;
    unsigned char reday;

    ifrun= 0;
    reday =0;

    if(year<=0||month<=0||month>12)
        return reday;

    if( ((year%4 EQ 0)&&(year%100!=0))||(year%400 EQ 0))
        ifrun=1;

    if(month EQ 2)
    {
        if(ifrun)
        {
            reday = 29;
        }
        else
        {
            reday = 28;
        }
    }
    else
    {
        switch(month)
        {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            {
                reday = 31;
            }break;
        case 4:
        case 6:
        case 9:
        case 11:
            {
                reday = 30;
            }break;
        }
    }


    return reday;
}

unsigned char DT_CheckDateTime(DT_DATE_TIME thisdat)
{
    unsigned char tday;
    if(thisdat.month<=0||thisdat.month>12)
        return 0;
    tday =  DT_GetMaxDay(thisdat.year, thisdat.month);
    if(thisdat.day<=0||thisdat.day>tday)
        return 0;
    if(thisdat.hour>23)
        return 0;
    if(thisdat.minute>59)
        return 0;
    if(thisdat.second>59)
        return 0;
    return 1;
}

unsigned char DT_GetNextDay(DT_DATE_TIME *nextdat, DT_DATE_TIME thisdat)
{
    unsigned char day ;

    day = DT_GetMaxDay(thisdat.year,thisdat.month);
    if(day<=0)
        return 0;
    if(thisdat.day>day&&thisdat.day<=0)
        return 0;
    else if(thisdat.day<day)
    {
        nextdat->year=thisdat.year;
        nextdat->month=thisdat.month;
        nextdat->day=thisdat.day+1;
        return 1;
    }
    else if(thisdat.day>=day)
    {
        if(thisdat.month>=12)
        {
            nextdat->year=thisdat.year+1;
            nextdat->month=1;
            nextdat->day=1;
        }
        else
        {
            nextdat->year=thisdat.year;
            nextdat->month=thisdat.month+1;
            nextdat->day=1;
        }

        return 1;
    }

    return 0;

}

unsigned char DT_GetLastDay(DT_DATE_TIME *nextdat, DT_DATE_TIME thisdat)
{
    unsigned char day ;

    day = DT_GetMaxDay(thisdat.year,thisdat.month);
    if(day<=0)
        return 0;
    if(thisdat.day>day&&thisdat.day<=0)
        return 0;
    else if(thisdat.day>1)
    {
        nextdat->year=thisdat.year;
        nextdat->month=thisdat.month;
        nextdat->day=thisdat.day-1;
        if(nextdat->day<=0)
            return 0;
        else return 1;
    }
    else if(thisdat.day<=1)
    {
        if(thisdat.month>1)
        {
            nextdat->year=thisdat.year;
            nextdat->month=thisdat.month-1;
            nextdat->day=(unsigned char)DT_GetMaxDay(nextdat->year,nextdat->month);
        }
        else
        {
            nextdat->year=thisdat.year-1;
            nextdat->month=12;
            nextdat->day=(unsigned char)DT_GetMaxDay(nextdat->year,nextdat->month);
        }
        if(nextdat->day<=0)
            return 0;
        else return 1;
    }
    return 0;
}

unsigned short DT_NextYear(DT_DATE_TIME *nowDateTime)
{
    unsigned char tmpday;
    nowDateTime->year++;
    tmpday=(unsigned char)DT_GetMaxDay(nowDateTime->year, nowDateTime->month);
    if(nowDateTime->day>tmpday)
        nowDateTime->day=tmpday;
    return nowDateTime->year;
}

unsigned char DT_NextMonth(DT_DATE_TIME *nowDateTime)
{
    unsigned char tmpday;
    nowDateTime->month++;
    if(nowDateTime->month>12)
    {
        nowDateTime->month=1;
        nowDateTime->year++;
    }
    tmpday=(unsigned char)DT_GetMaxDay(nowDateTime->year, nowDateTime->month);
    if(nowDateTime->day>tmpday)
        nowDateTime->day=tmpday;
    return nowDateTime->month;
}

unsigned char DT_NextDay(DT_DATE_TIME *nowDateTime)
{
    DT_DATE_TIME tmpTimer;
    DT_CopyDateTime(&tmpTimer, *nowDateTime);
    DT_GetNextDay(nowDateTime, tmpTimer);
    return nowDateTime->day;
}

unsigned char DT_NextHour(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->hour<23)
        nowDateTime->hour++;
    else
    {
        nowDateTime->hour=0;
        DT_NextDay(nowDateTime);
    }

    return nowDateTime->hour;
}

unsigned char DT_NextMinute(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->minute<59)
        nowDateTime->minute++;
    else
    {
        nowDateTime->minute=0;
        DT_NextHour(nowDateTime);
    }
    return nowDateTime->minute;
}

unsigned char DT_NextSecond(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->second<59)
        nowDateTime->second++;
    else
    {
        nowDateTime->second=0;
        DT_NextMinute(nowDateTime);
    }

    return nowDateTime->second;
}

unsigned short DT_LastYear(DT_DATE_TIME *nowDateTime)
{
    unsigned char tmpday;
    if(nowDateTime->year>1)
        nowDateTime->year--;
    tmpday=(unsigned char)DT_GetMaxDay(nowDateTime->year, nowDateTime->month);
    if(nowDateTime->day>tmpday)
        nowDateTime->day=tmpday;
    return nowDateTime->year;
}

unsigned char DT_LastMonth(DT_DATE_TIME *nowDateTime)
{
    unsigned char tmpday;
    if(nowDateTime->month>1)
        nowDateTime->month--;
    else
    {
        if(nowDateTime->year>1)
        {
            nowDateTime->month=12;
            nowDateTime->year--;
        }
    }
    tmpday=(unsigned char)DT_GetMaxDay(nowDateTime->year, nowDateTime->month);
    if(nowDateTime->day>tmpday)
        nowDateTime->day=tmpday;
    return nowDateTime->month;
}

unsigned char DT_LastDay(DT_DATE_TIME *nowDateTime)
{
    DT_DATE_TIME tmpTimer;
    DT_CopyDateTime(&tmpTimer, *nowDateTime);
    DT_GetLastDay(nowDateTime, tmpTimer);
    return nowDateTime->day;
}

unsigned char DT_LastHour(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->hour>0)
    nowDateTime->hour--;
    else
    {
        nowDateTime->hour=23;
        DT_LastDay(nowDateTime);
    }
    return nowDateTime->hour;
}

unsigned char DT_LastMinute(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->minute>0)
        nowDateTime->minute--;
    else
    {
        nowDateTime->minute=59;
        DT_LastHour(nowDateTime);
    }
    return nowDateTime->minute;
}


unsigned char DT_LastSecond(DT_DATE_TIME *nowDateTime)
{
    if(nowDateTime->second>0)
        nowDateTime->second--;
    else
    {
        nowDateTime->minute=59;
        DT_LastMinute(nowDateTime);
    }
    return nowDateTime->second;
}

void DT_MaxDateTime(DT_DATE_TIME *nowDateTime, DT_DATE_TIME maxDateTimer)
{
    unsigned char ifCover=0;

    if(nowDateTime->year>maxDateTimer.year)
        ifCover=1;
    else if(nowDateTime->year EQ maxDateTimer.year)
    {
        if(nowDateTime->month>maxDateTimer.month)
            ifCover=1;
        else if(nowDateTime->month EQ maxDateTimer.month)
        {
            if(nowDateTime->day>maxDateTimer.day)
                ifCover=1;
            else if(nowDateTime->day EQ maxDateTimer.day)
            {
                if(nowDateTime->hour>maxDateTimer.hour)
                    ifCover=1;
                else if(nowDateTime->hour EQ maxDateTimer.hour)
                {
                    if(nowDateTime->minute>maxDateTimer.minute)
                        ifCover=1;
                    else if(nowDateTime->minute EQ maxDateTimer.minute)
                    {
                        if(nowDateTime->second>maxDateTimer.second)
                            ifCover=1;
                    }
                }
            }
        }
    }

    if(ifCover)
        DT_CopyDateTime(nowDateTime,maxDateTimer);
}

void DT_MinDateTime(DT_DATE_TIME *nowDateTime, DT_DATE_TIME minDateTimer)
{
    unsigned char ifCover=0;

    if(nowDateTime->year<minDateTimer.year)
        ifCover=1;
    else if(nowDateTime->year EQ minDateTimer.year)
    {
        if(nowDateTime->month<minDateTimer.month)
            ifCover=1;
        else if(nowDateTime->month EQ minDateTimer.month)
        {
            if(nowDateTime->day<minDateTimer.day)
                ifCover=1;
            else if(nowDateTime->day EQ minDateTimer.day)
            {
                if(nowDateTime->hour<minDateTimer.hour)
                    ifCover=1;
                else if(nowDateTime->hour EQ minDateTimer.hour)
                {
                    if(nowDateTime->minute<minDateTimer.minute)
                        ifCover=1;
                    else if(nowDateTime->minute EQ minDateTimer.minute)
                    {
                        if(nowDateTime->second<minDateTimer.second)
                            ifCover=1;
                    }
                }
            }
        }
    }

    if(ifCover)
        DT_CopyDateTime(nowDateTime,minDateTimer);
}