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timekeeping.c
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timekeeping.c
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
char getch(){
char ch;
ch = getchar();
printf("%c \n", ch);
return ch;
}
void displayTime(struct tm* myTime){
char buffer[80];
strftime(buffer, 80, "%a %Y-%m-%d \n %H:%M:%S \n", myTime);
puts(buffer);
}
void displayTimeSetting(struct tm* myTime, int select){
char* day[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" };
switch(select){
case 0:
printf("%s %d-%02d-%02d \n %02d:%02d:\033[4m%02d\033[0m\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
case 1:
printf("%s %d-%02d-%02d \n %02d:\033[4m%02d\033[0m:%02d\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
case 2:
printf("%s %d-%02d-%02d \n \033[4m%02d\033[0m:%02d:%02d\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
case 3:
printf("%s \033[4m%d\033[0m-%02d-%02d \n %02d:%02d:%02d\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
case 4:
printf("%s %d-\033[4m%02d\033[0m-%02d \n %02d:%02d:%02d\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
case 5:
printf("%s %d-%02d-\033[4m%02d\033[0m \n %02d:%02d:%02d\n", day[myTime->tm_wday], myTime->tm_year + 1900, myTime->tm_mon + 1, myTime->tm_mday, myTime->tm_hour, myTime->tm_min, myTime->tm_sec);
break;
default:
printf("input error \n");
}
}
void CurrentTimeShift(int* select){
*select = (*select + 1) % 6;
}
void IncreaseCurrentTime(int select, struct tm* myTime){
switch(select){
case 0:
myTime->tm_sec++;
break;
case 1:
myTime->tm_min++;
break;
case 2:
myTime->tm_hour++;
break;
case 3:
myTime->tm_year++;
break;
case 4:
myTime->tm_mon++;
break;
case 5:
myTime->tm_mday++;
break;
default:
printf("input error \n");
}
mktime(myTime);
}
void TimeSetting(struct tm* myTime){
int select = 0;
char ch;
while(1){
system("clear");
printf("=====TIME SETTING=====\n");
displayTimeSetting(myTime, select);
ch = getch();
if(ch == 'a'){
break;
} else if(ch == 'b') {
IncreaseCurrentTime(select, myTime);
} else if(ch == 'c') {
CurrentTimeShift(&select);
}
}
}
void TimeKeepingMode(struct tm* myTime){
system("clear");
printf("=====CURRENT TIME=====\n");
displayTime(myTime);
//should get key inputs with multi-threads or asynchronously
if(getch() == 'a'){
TimeSetting(myTime);
}
myTime->tm_sec++;
mktime(myTime);
}
int main(){
//for initializing current time data
time_t timeinfo;
struct tm* currentTime = malloc(sizeof(struct tm));
time(&timeinfo);
currentTime = localtime(&timeinfo);
//initial time - set to 2019/01/01 00:00:00
currentTime->tm_year = 2019 - 1900;
currentTime->tm_mon = 1 - 1;
currentTime->tm_mday = 1;
currentTime->tm_hour = 0;
currentTime->tm_min = 0;
currentTime->tm_sec = 0;
while(1){
TimeKeepingMode(currentTime);
sleep(1);
}
}