/* hours.c      Joe Mietus      Oct 7 2008 */

/*

hours :

Usage: hours seconds | -

  Convert seconds to hh:mm:ss.

  `-' to read stdin

*/

#include <stdio.h>

#include <stdlib.h>

main(argc, argv)

int argc;

char *argv[];

{

    long sec, atol();

    char *timstr();

    if (argc < 2) {

    usage(argv[0]);  

    exit(1);

    }

    if (*argv[1] == '-')

        switch (argv[1][1]) {

        case '\0' : while (scanf("%ld", &sec) == 1)

                        printf("%s\n", timstr(sec));

                exit(0);

        default : usage(argv[0]);

              exit(1);

    }

    else

    printf("%s\n", timstr(atol(argv[1])));

}

char *timstr(time)  /* convert seconds to [hh:]mm:ss */

long time;

{

    int hours, minutes, seconds;

    static char buf[9];

    hours = time / 3600L; time -= (long)hours * 3600;

    minutes = time / 60;

    seconds = time - minutes * 60;

    sprintf(buf, "%02d:%02d:%02d", hours, minutes, seconds);

    return (buf);

}

usage(prog)

char *prog;

{

    fprintf(stderr, "Usage: %s seconds | -\n", prog);

    fprintf(stderr, " Convert seconds to hh:mm:ss.\n");

    fprintf(stderr, " `-' to read stdin\n");

}