pvjc20/du3/program.c

#define _XOPEN_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int ValidateTime(int dd , int mm , int yy)
{
    if(yy>=1900 && yy<=9999)
    {
        //check month
        if(mm>=1 && mm<=12)
        {
            //check days
            if((dd>=1 && dd<=31) && (mm==1 || mm==3 || mm==5 || mm==7 || mm==8 || mm==10 || mm==12))
                return 1;
            else if((dd>=1 && dd<=30) && (mm==4 || mm==6 || mm==9 || mm==11))
                return 1;
            else if((dd>=1 && dd<=28) && (mm==2))
                return 1;
            else if(dd==29 && mm==2 && (yy%400==0 ||(yy%4==0 && yy%100!=0)))
                return 1;
            else
                return 0;
        }
        else
        {
            return 0;
        }
    }
    else
    {
        return 0;
    }
}

int main()
{
    
    char dateStr[11];
    struct tm t;
    int dd = 0, mm = 0, yy = 0;
    
    fgets(dateStr, 11, stdin);
    sscanf(dateStr , "%d.%d.%d" , &dd,&mm,&yy);
    if(!ValidateTime(dd,mm,yy)){
        printf("Nespravny datum\n");
        return 1;
    }
    char* res = strptime(dateStr, "%d.%m.%Y", &t);
    if (res == NULL) {
        printf("error: can't parse date!\n");
        return 1;
    }
    
    t.tm_mday += 7;
    t.tm_sec = 0;
    t.tm_min = 0;
    t.tm_hour = 0;

    time_t mid = mktime(&t);
    struct tm* t2 = localtime(&mid);
    
    
    if(t2->tm_mday < 10){
        if(t2->tm_mon + 1 < 10){
            printf(" %d.0%d.%d\n\n", t2->tm_mday, t2->tm_mon + 1, t2->tm_year + 1900);
        } else{
            printf(" %d.%d.%d\n\n", t2->tm_mday, t2->tm_mon + 1, t2->tm_year + 1900);
        }
    } else{
        if(t2->tm_mon + 1 < 10){
            printf("%d.0%d.%d\n\n", t2->tm_mday, t2->tm_mon + 1, t2->tm_year + 1900);
        } else{
            printf("%d.%d.%d\n\n", t2->tm_mday, t2->tm_mon + 1, t2->tm_year + 1900);
        }
    }
    
    return 0;
    /*if (time == (time_t)-1) {
        printf("fails with error: can't convert date to time!\n");
        return 1;
    }*/
    
    //t2 = localtime(&sec);
    
    /*time(&timer);
    double seconds = difftime(timer,mktime(&t));
    printf("%.f", seconds);
    return 0;
    if(t.tm_mon + 1 < 10){
        printf(" %d.0%d.%d\n\n", t.tm_mday, t.tm_mon + 1, t.tm_year + 1900);
    } else{
        printf(" %d.%d.%d\n\n", t.tm_mday, t.tm_mon + 1, t.tm_year + 1900);
    }
    
    
    exit(EXIT_SUCCESS);

    return 0;*/
}