/*
 * $d$
 * www.pccl.demon.co.uk
 *
 * Program to interpret time since Unix epoch.
 */

#include	<sys/types.h>
#include	<errno.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<time.h>
#include	<unistd.h>

extern char *basename ();
static char *sProgname;

static void usage (void)
{
	(void) printf ("Usage: %s [-h] [-M] time...\n", sProgname);
}

static void help (void)
{
	usage ();
	(void ) printf ("    -h    help.\n");
	(void ) printf ("    -m    input is in milliseconds since midnight.\n");
	(void ) printf ("    time  input times (dec, hex or oct).\n");
	(void ) printf ("              default - secs since Unix epoch\n");
}

static void display (char * aText, time_t aTime, int aDisplayDate)
{
	struct tm	*lTm			= gmtime (&aTime);
	char		*lTextTime;
	if (aDisplayDate)
	{
		lTm			= gmtime (&aTime);
		lTextTime	= asctime (lTm);
		(void) printf ("%s interpreted as %ld (0x%lx) - GMT:   %s",
							aText,
							aTime,
							aTime,
							lTextTime);
		lTm			= localtime (&aTime);
		lTextTime	= asctime (lTm);
		(void) printf ("%s interpreted as %ld (0x%lx) - local: %s",
							aText,
							aTime,
							aTime,
							lTextTime);
	}
	else
	{
		lTm			= gmtime (&aTime);
		(void) printf ("%s interpreted as %ld (0x%lx) - GMT:   %02d:%02d:%02d\n",
							aText,
							aTime,
							aTime,
							lTm->tm_hour,
							lTm->tm_min,
							lTm->tm_sec);
		lTm			= localtime (&aTime);
		(void) printf ("%s interpreted as %ld (0x%lx) - local: %02d:%02d:%02d\n",
							aText,
							aTime,
							aTime,
							lTm->tm_hour,
							lTm->tm_min,
							lTm->tm_sec);
	}
}

main (int argc, char *argv[])
{
	int		c;
	int		lMidnight = 0;
	time_t	lNow;

	sProgname	= basename (argv[0]);
	while ((c = getopt (argc, argv, "hm")) != EOF)
	{
		switch (c)
		{
			case 'h':
			{
				help ();
				exit (0);;
			}
			case 'm':
			{
				lMidnight	= 1;
				break;
			}
			case '?':
			{
				usage ();
				exit (EINVAL);
			}
		}
	}
	(void) time (&lNow);
	display ("Time now", lNow, 1);
	for (; optind < argc; optind++)
	{
		long lInputTime	= strtoul (argv[optind], NULL, 0);
		if (lMidnight)
		{
			display (argv[optind], lInputTime / 1000, 0);
		}
		else
		{
			display (argv[optind], lInputTime, 1);
		}
	}
}