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/*
* 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, "")) != -1)
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));
}
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