102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
|
/*
|
||
|
|
* 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));
|
||
|
|
}
|