[C/C++] 存取系統時間

說明:
存取系統時間

Code:

#include <stdio.h>
#include <time.h>
#include <string.h>

#define BOOL                    int
#define TRUE                    0
#define FALSE                   -1
#define MAX_LONG_LENGTH         1024
#define MAX_SHORT_LENGTH        128

void get_time_fun(char *p_time)
{
    memset(p_time, '\0', strlen(p_time));
    struct tm *tm_ptr;
    time_t the_time;
    time(&the_time);
    tm_ptr = localtime(&the_time);
    sprintf(p_time, "%02d/%02d/%02d,%02d:%02d:%02d", 
        tm_ptr->tm_year + 1900, 
        tm_ptr->tm_mon + 1, 
        tm_ptr->tm_mday, 
        tm_ptr->tm_hour, 
        tm_ptr->tm_min, 
        tm_ptr->tm_sec);        
}
                                                           
BOOL set_time_fun(char *buffertime)                             
{
    struct tm tm_per;
    time_t time1; 
    int year,month,day,hour,min,sec,flag,len;
    year = month = day = hour = min = sec = flag = len = 0;

    len = strlen(buffertime);
    if(strlen(buffertime) != 19){
        return FALSE;
    }
    
    flag = sscanf(buffertime,"%d:%d:%d,%d:%d:%d", 
                &year, 
                &month, 
                &day, 
                &hour, 
                &min, 
                &sec);

    if(flag != 6){
        flag = -1;
    }else{
        flag = 0;
    }
    
    if(year < 1)
        flag = -1;
    if((month < 1) || (month > 12))
        flag = -1;
    if((day < 1) || (day > 31))
         flag = -1;
    if((hour < 0) || (hour > 23))
         flag = -1;
    if((min < 0) || (min > 59))
         flag = -1;
    if((sec < 0) || (sec > 59))
         flag = -1;
    
    if(flag < 0){
        return FALSE;
    }
    
    tm_per.tm_year     = year - 1900;
    tm_per.tm_mon    = month - 1;
    tm_per.tm_mday    = day;
    tm_per.tm_hour    = hour;
    tm_per.tm_min    = min;
    tm_per.tm_sec    = sec;    
    
    time1=mktime(&tm_per);
    printf("mktime=%ld\n",time1);
    
    if(time1 > 0){
        
#if __GLIBC_MINOR__ == 31
        struct timespec res;
        res.tv_sec = time1;
        
       if (clock_settime(CLOCK_REALTIME, &res) ==0)
#else
        if(stime(&time1)==0)
#endif
        {
            return TRUE;
        }else{
            return FALSE;
        }
    }else{
        return FALSE;
    }
}      

int main(int argc, char *argv[])
{
    char p_time[MAX_SHORT_LENGTH];
    
    get_time_fun(p_time);
    printf("Time: %s\n", p_time);
    
    set_time_fun(p_time);
    
    return 0;
}

Result:

Time: 2022/05/16,15:14:42