BSD 4.4 Lite Usr.bin Sources

1 files changed, 135 insertions, 0 deletions

diff --git a/usr.bin/who/who.c b/usr.bin/who/who.c
new file mode 100644
index 0000000..d1e6eb9
--- /dev/null
+++ b/usr.bin/who/who.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Michael Fischbein.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1989, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)who.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <pwd.h>
+#include <utmp.h>
+#include <stdio.h>
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	register char *p;
+	struct utmp usr;
+	struct passwd *pw;
+	FILE *ufp, *file();
+	char *t, *rindex(), *strcpy(), *strncpy(), *ttyname();
+	time_t time();
+
+	switch (argc) {
+	case 1:					/* who */
+		ufp = file(_PATH_UTMP);
+		/* only entries with both name and line fields */
+		while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
+			if (*usr.ut_name && *usr.ut_line)
+				output(&usr);
+		break;
+	case 2:					/* who utmp_file */
+		ufp = file(argv[1]);
+		/* all entries */
+		while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
+			output(&usr);
+		break;
+	case 3:					/* who am i */
+		ufp = file(_PATH_UTMP);
+
+		/* search through the utmp and find an entry for this tty */
+		if (p = ttyname(0)) {
+			/* strip any directory component */
+			if (t = rindex(p, '/'))
+				p = t + 1;
+			while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
+				if (usr.ut_name && !strcmp(usr.ut_line, p)) {
+					output(&usr);
+					exit(0);
+				}
+			/* well, at least we know what the tty is */
+			(void)strncpy(usr.ut_line, p, UT_LINESIZE);
+		} else
+			(void)strcpy(usr.ut_line, "tty??");
+		pw = getpwuid(getuid());
+		(void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
+		(void)time(&usr.ut_time);
+		*usr.ut_host = '\0';
+		output(&usr);
+		break;
+	default:
+		(void)fprintf(stderr, "usage: who [ file ]\n       who am i\n");
+		exit(1);
+	}
+	exit(0);
+}
+
+output(up)
+	struct utmp *up;
+{
+	char *ctime();
+
+	(void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name,
+	    UT_LINESIZE, UT_LINESIZE, up->ut_line);
+	(void)printf("%.12s", ctime(&up->ut_time) + 4);
+	if (*up->ut_host)
+		printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host);
+	(void)putchar('\n');
+}
+
+FILE *
+file(name)
+	char *name;
+{
+	extern int errno;
+	FILE *ufp;
+	char *strerror();
+
+	if (!(ufp = fopen(name, "r"))) {
+		(void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno));
+		exit(1);
+	}
+	return(ufp);
+}