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author | charnier <charnier@FreeBSD.org> | 1997-08-22 06:50:33 +0000 |
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committer | charnier <charnier@FreeBSD.org> | 1997-08-22 06:50:33 +0000 |
commit | eaef13799223de597ae84443bde1bd6a34701550 (patch) | |
tree | 3aa968e040019441ab78e3128cc9c6657074707e /usr.bin/users | |
parent | 0c770f97ecae7439592571f489b1a7baa4f03eba (diff) | |
download | FreeBSD-src-eaef13799223de597ae84443bde1bd6a34701550.zip FreeBSD-src-eaef13799223de597ae84443bde1bd6a34701550.tar.gz |
Was limited to 200 users. New entry is now allocated as needed.
Add usage().
Obtained from:OpenBSD.
Diffstat (limited to 'usr.bin/users')
-rw-r--r-- | usr.bin/users/users.1 | 2 | ||||
-rw-r--r-- | usr.bin/users/users.c | 64 |
2 files changed, 43 insertions, 23 deletions
diff --git a/usr.bin/users/users.1 b/usr.bin/users/users.1 index 57ae2db..04f5c6a 100644 --- a/usr.bin/users/users.1 +++ b/usr.bin/users/users.1 @@ -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, diff --git a/usr.bin/users/users.c b/usr.bin/users/users.c index 48a584a..5e5c2bb 100644 --- a/usr.bin/users/users.c +++ b/usr.bin/users/users.c @@ -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); } +static void +usage() +{ + (void)fprintf(stderr, "usage: users\n"); + exit(1); +} + +int scmp(p, q) - char *p, *q; + const void *p, *q; { - return(strncmp(p, q, UT_NAMESIZE)); + return(strncmp((char *)p, (char *)q, UT_NAMESIZE)); } |