xsh_date.c

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/* xsh_date.c - xsh_date */

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

/*------------------------------------------------------------------------
 * xsh_date - obtain and print the current month, day, year, and time
 *------------------------------------------------------------------------
 */
shellcmd xsh_date(int nargs, char *args[]) {

    int32   retval;         /* return value         */
    uint32  now;            /* current local time       */
    char    datestr[64];        /* printable date in ascii  */

    /* Output info for '--help' argument */

    if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
        printf("Usage: %s\n\n", args[0]);
        printf("Description:\n");
        printf("\tDisplays the current date and time\n");
        printf("Options (one per invocation):\n");
        printf("\t-f\tforce a time server request to be sent\n");
        printf("\t-d\tset daylight savings time on\n");
        printf("\t-s\tset standard time (not daylight savings)\n");
        printf("\t-a\tset daylight savings to automatic\n");
        printf("\t--help\tdisplay this help and exit\n");
        return 0;
    }

    /* Check argument count */

    if (nargs > 2) {
        fprintf(stderr, "%s: too many arguments\n", args[0]);
        fprintf(stderr, "Try '%s --help' for more information\n",
            args[0]);
        return 1;
    }

    if (nargs == 2) {
        if (strncmp(args[1], "-f", 3) == 0) {
            Date.dt_bootvalid = FALSE;
        } else if (strncmp(args[1], "-d", 3) == 0) {
            Date.dt_daylight = DATE_DST_ON;
        } else if (strncmp(args[1], "-s", 3) == 0) {
            Date.dt_daylight = DATE_DST_OFF;
        } else if (strncmp(args[1], "-a", 3) == 0) {
            Date.dt_daylight = DATE_DST_AUTO;
        } else {
            fprintf(stderr, "%s: invalid argument\n", args[0]);
            fprintf(stderr,
                "Try '%s --help' for more information\n",
                args[0]);
            return 1;
        }
    }

    retval = gettime(&now);
    if (retval == SYSERR) {
        fprintf(stderr,
            "%s: could not obtain the current date\n",
            args[0]);
        return 1;
    }
    ascdate(now, datestr);
    printf("%s\n", datestr);
    return 0;
}