1 files changed, 101 insertions, 0 deletions
diff --git a/usr.bin/users/users.c b/usr.bin/users/users.c
new file mode 100644
index 0000000..11571f2
--- /dev/null
+++ b/usr.bin/users/users.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 1980, 1987, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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) 1980, 1987, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)users.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <utmp.h>
+#include <stdio.h>
+
+#define	MAXUSERS	200
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	extern int optind;
+	register int cnt, ncnt;
+	struct utmp utmp;
+	char names[MAXUSERS][UT_NAMESIZE];
+	int ch, scmp();
+
+	while ((ch = getopt(argc, argv, "")) != EOF)
+		switch(ch) {
+		case '?':
+		default:
+			(void)fprintf(stderr, "usage: users\n");
+			exit(1);
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (!freopen(_PATH_UTMP, "r", stdin)) {
+		(void)fprintf(stderr, "users: can't open %s.\n", _PATH_UTMP);
+		exit(1);
+	}
+	for (ncnt = 0;
+	    fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1;)
+		if (*utmp.ut_name) {
+			if (ncnt == MAXUSERS) {
+				(void)fprintf(stderr,
+				    "users: too many users.\n");
+				break;
+			}
+			(void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
+			++ncnt;
+		}
+
+	if (ncnt) {
+		qsort(names, ncnt, UT_NAMESIZE, scmp);
+		(void)printf("%.*s", UT_NAMESIZE, names[0]);
+		for (cnt = 1; cnt < ncnt; ++cnt)
+			if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE))
+				(void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
+		(void)printf("\n");
+	}
+	exit(0);
+}
+
+scmp(p, q)
+	char *p, *q;
+{
+	return(strncmp(p, q, UT_NAMESIZE));
+}