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Was limited to 200 users. New entry is now allocated as needed.

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Add usage().
Obtained from:OpenBSD.
This commit is contained in:
Philippe Charnier 1997-08-22 06:50:33 +00:00
parent d4ba5766dd
commit 474cc7fe23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=28563
2 changed files with 44 additions and 24 deletions
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2
usr.bin/users/users.1
View File

@ -38,7 +38,7 @@
.Nm users
.Nd list current users
.Sh SYNOPSIS
.Nm users
.Nm
.Sh DESCRIPTION
.Nm Users
lists the login names of the users currently on the system,

66
usr.bin/users/users.c
View File

@ -32,57 +32,69 @@
*/
#ifndef lint
static char copyright[] =
static const char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$Id$";
#endif /* not lint */
#include <sys/types.h>
#include <utmp.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#define MAXUSERS 200
typedef char namebuf[UT_NAMESIZE];
int scmp __P((const void *, const void *));
static void usage __P((void));
void
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
register int cnt, ncnt;
namebuf *names = NULL;
int ncnt = 0;
int nmax = 0;
int cnt;
struct utmp utmp;
char names[MAXUSERS][UT_NAMESIZE];
int ch, scmp();
int ch;
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
default:
(void)fprintf(stderr, "usage: users\n");
exit(1);
usage();
}
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 (!freopen(_PATH_UTMP, "r", stdin))
errx(1, "can't open %s", _PATH_UTMP);
while (fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1) {
if (*utmp.ut_name) {
if (ncnt == MAXUSERS) {
(void)fprintf(stderr,
"users: too many users.\n");
break;
if (ncnt >= nmax) {
nmax += 32;
names = realloc(names, sizeof (*names) * nmax);
if (!names) {
errx(1, "realloc");
/* NOTREACHED */
}
}
(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]);
@ -94,8 +106,16 @@ main(argc, argv)
exit(0);
}
scmp(p, q)
char *p, *q;
static void
usage()
{
return(strncmp(p, q, UT_NAMESIZE));
(void)fprintf(stderr, "usage: users\n");
exit(1);
}
int
scmp(p, q)
const void *p, *q;
{
return(strncmp((char *)p, (char *)q, UT_NAMESIZE));
}