+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved. The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
#ifndef lint
-static char *sccsid = "@(#)who.c 4.6 (Berkeley) %G%";
-#endif
+char copyright[] =
+"@(#) Copyright (c) 1980 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif not lint
+
+#ifndef lint
+static char sccsid[] = "@(#)who.c 5.5 (Berkeley) %G%";
+#endif not lint
+
/*
* who
*/
struct utmp utmp;
struct passwd *pw;
struct passwd *getpwuid();
-char hostname[32];
char *ttyname(), *rindex(), *ctime(), *strcpy();
{
register char *tp, *s;
register FILE *fi;
- extern char _sobuf[];
- setbuf(stdout, _sobuf);
s = "/etc/utmp";
if(argc == 2)
s = argv[1];
if (tp)
tp = rindex(tp, '/') + 1;
else { /* no tty - use best guess from passwd file */
- pw = getpwuid(getuid());
- strncpy(utmp.ut_name, pw ? pw->pw_name : "?", NMAX);
- strcpy(utmp.ut_line, "tty??");
- time(&utmp.ut_time);
- putline();
+ (void)strcpy(utmp.ut_line, "tty??");
+ guess();
exit(0);
}
}
- if ((fi = fopen(s, "r")) == NULL) {
- puts("who: cannot open utmp");
+ if (!(fi = fopen(s, "r"))) {
+ fprintf(stderr, "who: cannot read %s.\n", s);
exit(1);
}
while (fread((char *)&utmp, sizeof(utmp), 1, fi) == 1) {
if (argc == 3) {
- gethostname(hostname, sizeof (hostname));
if (strcmp(utmp.ut_line, tp))
continue;
- printf("%s!", hostname);
- putline();
+ if (!utmp.ut_name[0])
+ guess();
+ else
+ putline();
exit(0);
}
if (utmp.ut_name[0] == '\0' && argc == 1)
continue;
putline();
}
+ if (argc == 3) {
+ strncpy(utmp.ut_line, tp, sizeof(utmp.ut_line));
+ guess();
+ }
+ exit(0);
}
putline()
printf("\t(%.*s)", HMAX, utmp.ut_host);
putchar('\n');
}
+
+guess()
+{
+ pw = getpwuid(getuid());
+ strncpy(utmp.ut_name, pw ? pw->pw_name : "?", NMAX);
+ time(&utmp.ut_time);
+ putline();
+}