diff options
Diffstat (limited to 'usr.bin/users/users.c')
-rw-r--r-- | usr.bin/users/users.c | 101 |
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)); +} |