122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*
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* Copyright (c) 1980, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$Id: users.c,v 1.3 1997/08/22 06:50:33 charnier Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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typedef char namebuf[UT_NAMESIZE];
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int scmp __P((const void *, const void *));
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static void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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namebuf *names = NULL;
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int ncnt = 0;
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int nmax = 0;
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int cnt;
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struct utmp utmp;
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int ch;
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while ((ch = getopt(argc, argv, "")) != -1)
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switch(ch) {
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!freopen(_PATH_UTMP, "r", stdin))
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errx(1, "can't open %s", _PATH_UTMP);
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while (fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1) {
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if (*utmp.ut_name) {
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if (ncnt >= nmax) {
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nmax += 32;
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names = realloc(names, sizeof (*names) * nmax);
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if (!names) {
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errx(1, "realloc");
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/* NOTREACHED */
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}
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}
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(void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
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++ncnt;
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}
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}
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if (ncnt) {
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qsort(names, ncnt, UT_NAMESIZE, scmp);
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(void)printf("%.*s", UT_NAMESIZE, names[0]);
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for (cnt = 1; cnt < ncnt; ++cnt)
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if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE))
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(void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
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(void)printf("\n");
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}
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exit(0);
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: users\n");
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exit(1);
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}
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int
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scmp(p, q)
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const void *p, *q;
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{
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return(strncmp((char *)p, (char *)q, UT_NAMESIZE));
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}
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