/* xsh_uptime.c - xsh_uptime */

#include 
#include 
#include 

/*------------------------------------------------------------------------
 * xsh_uptime - shell to print the time the system has been up
 *------------------------------------------------------------------------
 */
shellcmd xsh_uptime(int nargs, char *args[])
{
        uint32  days, hrs, mins, secs;  /* Days, hours, minutes,  and   */
                                        /*  seconds since system boot   */
        uint32  secperday = 86400;      /* Seconds in a day             */
        uint32  secperhr  =  3600;      /* Seconds in an hour           */
        uint32  secpermin =    60;      /* Seconds in a minute          */      

        /* For argument '--help', emit help about the 'uptime' command  */

        if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
                printf("Use: %s\n\n", args[0]);
                printf("Description:\n");
                printf("\tDisplays time since the system booted\n");
                printf("Options:\n");
                printf("\t--help\t display this help and exit\n");
                return 0;
        }

        /* Check for valid number of arguments */

        if (nargs > 1) {
                fprintf(stderr, "%s: too many arguments\n", args[0]);
                fprintf(stderr, "Try '%s --help' for more information\n",
                                args[0]);
                return 1;
        }

        secs = clktime;         /* Total seconds since boot */

        /* Subtract number of whole days */

        days  = secs/secperday;
        secs -= days*secperday;

        /* Subtract number of hours */

        hrs   = secs/secperhr;
        secs -= hrs*secperhr;

        /* Subtract number of minutes */

        mins  = secs/secpermin;
        secs -= mins*secpermin;

        printf("Xinu has been up ");
        if (days > 0) {
                printf(" %d day(s) ", days);
        }

        if (hrs > 0) {
                printf(" %d hour(s) ", hrs);
        }

        if (mins > 0) {
                printf(" %d minute(s) ", mins);
        }

        if (secs > 0) {
                printf(" %d second(s) ", secs);
        }
        printf("\n");

        return 0;
}