Return to users.c CVS log

Up to [local] / src / usr.bin / users

Annotation of src/usr.bin/users/users.c, Revision 1.1

1.1     ! deraadt     1: /*     $NetBSD: users.c,v 1.5 1994/12/20 15:58:19 jtc Exp $    */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1980, 1987, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. All advertising materials mentioning features or use of this software
        !            16:  *    must display the following acknowledgement:
        !            17:  *     This product includes software developed by the University of
        !            18:  *     California, Berkeley and its contributors.
        !            19:  * 4. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  */
        !            35:
        !            36: #ifndef lint
        !            37: static char copyright[] =
        !            38: "@(#) Copyright (c) 1980, 1987, 1993\n\
        !            39:        The Regents of the University of California.  All rights reserved.\n";
        !            40: #endif /* not lint */
        !            41:
        !            42: #ifndef lint
        !            43: #if 0
        !            44: static char sccsid[] = "@(#)users.c    8.1 (Berkeley) 6/6/93";
        !            45: #endif
        !            46: static char rcsid[] = "$NetBSD: users.c,v 1.5 1994/12/20 15:58:19 jtc Exp $";
        !            47: #endif /* not lint */
        !            48:
        !            49: #include <sys/types.h>
        !            50: #include <utmp.h>
        !            51: #include <stdio.h>
        !            52: #include <stdlib.h>
        !            53: #include <string.h>
        !            54: #include <err.h>
        !            55:
        !            56: typedef char   namebuf[UT_NAMESIZE];
        !            57:
        !            58: int scmp __P((const void *, const void *));
        !            59:
        !            60: int
        !            61: main(argc, argv)
        !            62:        int argc;
        !            63:        char **argv;
        !            64: {
        !            65:        namebuf *names = NULL;
        !            66:        register int ncnt = 0;
        !            67:        register int nmax = 0;
        !            68:        int cnt;
        !            69:        struct utmp utmp;
        !            70:        int ch;
        !            71:
        !            72:        while ((ch = getopt(argc, argv, "")) != EOF)
        !            73:                switch(ch) {
        !            74:                case '?':
        !            75:                default:
        !            76:                        (void)fprintf(stderr, "usage: users\n");
        !            77:                        exit(1);
        !            78:                }
        !            79:        argc -= optind;
        !            80:        argv += optind;
        !            81:
        !            82:        if (!freopen(_PATH_UTMP, "r", stdin)) {
        !            83:                err(1, "can't open %s", _PATH_UTMP);
        !            84:                /* NOTREACHED */
        !            85:        }
        !            86:
        !            87:        while (fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1) {
        !            88:                if (*utmp.ut_name) {
        !            89:                        if (ncnt >= nmax) {
        !            90:                                nmax += 32;
        !            91:                                names = realloc(names,
        !            92:                                        sizeof (*names) * nmax);
        !            93:
        !            94:                                if (!names) {
        !            95:                                        err(1, NULL);
        !            96:                                        /* NOTREACHED */
        !            97:                                }
        !            98:                        }
        !            99:
        !           100:                        (void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
        !           101:                        ++ncnt;
        !           102:                }
        !           103:        }
        !           104:
        !           105:        if (ncnt) {
        !           106:                qsort(names, ncnt, UT_NAMESIZE, scmp);
        !           107:                (void)printf("%.*s", UT_NAMESIZE, names[0]);
        !           108:                for (cnt = 1; cnt < ncnt; ++cnt)
        !           109:                        if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE))
        !           110:                                (void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
        !           111:                (void)printf("\n");
        !           112:        }
        !           113:        exit(0);
        !           114: }
        !           115:
        !           116: int
        !           117: scmp(p, q)
        !           118:        const void *p, *q;
        !           119: {
        !           120:        return(strncmp((char *) p, (char *) q, UT_NAMESIZE));
        !           121: }