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/*
 * Rec'd from Lauren, 7-16-84.
 * Who is on the system
 * and who am i.
 */

#include <stdio.h>
#include <utmp.h>

char	*whofile = "/etc/utmp";
int	ordflag = 1;		/* Ordinary who */

char	obuf[BUFSIZ];

main(argc, argv)
char *argv[];
{
	register char *mytty = NULL;
	struct utmp utmp;
	register FILE *ufp;
	extern char *ttyname();
	extern char *ctime();

	setbuf(stdout, obuf);
	switch(argc) {
	case 1:					/* who */
		break;
	case 2:					/* who whofile */
		whofile = argv[1];
		ordflag = 0;
		break;
	case 3:					/* who am i */
		if ((mytty = ttyname(fileno(stderr))) != NULL)
			mytty += 5;		/* space over "/dev" */
		break;
	case 4:					/* who whofile am i */
		whofile = argv[1];
		ordflag = 0;
		if ((mytty = ttyname(fileno(stderr))) != NULL)
			mytty += 5;		/* space over "/dev" */
		break;
	default:
		usage();
	}
	if ((ufp = fopen(whofile, "r")) == NULL)
		werr("Cannot open %s\n", whofile);
	while (fread(&utmp, sizeof (utmp), 1, ufp) == 1) {
		if (ordflag && utmp.ut_name[0]=='\0')
			continue;
		if (mytty!=NULL && strncmp(utmp.ut_line, mytty, 8))
			continue;
		printf( "%-8.8s %-7.7s %.12s\n", utmp.ut_name, utmp.ut_line,
			ctime( &utmp.ut_time)+4);
	}
}

/* VARARGS */
werr(x)
{
	if (!isatty(fileno(stdout)))
		fprintf(stderr, "who: ");
	fprintf(stderr, "%r", &x);
	exit (1);
}

usage()
{
	werr("Usage: who [who-file] [am I]\n");
}

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