136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Michael Fischbein.
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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 char copyright[] =
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"@(#) Copyright (c) 1989, 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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static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/file.h>
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#include <time.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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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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register char *p;
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struct utmp usr;
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struct passwd *pw;
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FILE *ufp, *file();
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char *t, *rindex(), *strcpy(), *strncpy(), *ttyname();
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switch (argc) {
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case 1: /* who */
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ufp = file(_PATH_UTMP);
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/* only entries with both name and line fields */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (*usr.ut_name && *usr.ut_line)
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output(&usr);
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break;
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case 2: /* who utmp_file */
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ufp = file(argv[1]);
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/* all entries */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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output(&usr);
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break;
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case 3: /* who am i */
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ufp = file(_PATH_UTMP);
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/* search through the utmp and find an entry for this tty */
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if (p = ttyname(0)) {
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/* strip any directory component */
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if (t = rindex(p, '/'))
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p = t + 1;
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (usr.ut_name && !strcmp(usr.ut_line, p)) {
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output(&usr);
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exit(0);
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}
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/* well, at least we know what the tty is */
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(void)strncpy(usr.ut_line, p, UT_LINESIZE);
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} else
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(void)strcpy(usr.ut_line, "tty??");
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pw = getpwuid(getuid());
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(void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
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(void)time(&usr.ut_time);
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*usr.ut_host = '\0';
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output(&usr);
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break;
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default:
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(void)fprintf(stderr, "usage: who [ file ]\n who am i\n");
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exit(1);
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}
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exit(0);
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}
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output(up)
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struct utmp *up;
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{
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char buf[80];
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(void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name,
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UT_LINESIZE, UT_LINESIZE, up->ut_line);
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(void)strftime(buf, sizeof(buf), "%c", localtime(&up->ut_time));
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(void)printf("%.12s", buf + 4);
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if (*up->ut_host)
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printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host);
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(void)putchar('\n');
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}
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FILE *
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file(name)
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char *name;
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{
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extern int errno;
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FILE *ufp;
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char *strerror();
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if (!(ufp = fopen(name, "r"))) {
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(void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno));
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exit(1);
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}
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return(ufp);
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}
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