groups.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
/*
* Copyright (c) 1983, 1984 1985, 1986, 1987, 1988, Sun Microsystems, Inc.
* All Rights Reserved.
*/
#ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
/*
* groups
*/
#include <sys/param.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
int groups[NGROUPS_UMAX];
main(argc, argv)
int argc;
char *argv[];
{
int ngroups, i, j;
char *sep = "";
register struct group *gr;
struct passwd *pw;
if (argc > 1) {
for (i=1; i < argc ; i++)
showgroups(argv[i]);
exit(0) ;
}
ngroups = getgroups(NGROUPS_UMAX, groups);
if ((pw = getpwuid(getuid())) == NULL) {
fprintf(stderr, "groups: could not find passwd entry\n");
exit(1);
}
for (i = 0; i < ngroups; i++) {
gr = getgrgid(groups[i]);
if (gr == NULL) {
printf("%s%d", sep, groups[i]);
sep = " ";
continue;
}
printf("%s%s", sep, gr->gr_name);
sep = " ";
}
printf("\n");
exit(0);
/* NOTREACHED */
}
showgroups(user)
register char *user;
{
register struct group *gr;
register struct passwd *pw;
register char **cp;
char *sep = "";
int pwgid_printed = 0 ;
if ((pw = getpwnam(user)) == NULL) {
fprintf(stderr, "groups: %s : No such user\n", user);
return;
}
setgrent() ;
printf("%s : ", user) ;
while (gr = getgrent()) {
if (pw->pw_gid == gr->gr_gid) {
/*
* To avoid duplicate group entries
*/
if (pwgid_printed==0) {
printf("%s%s", sep, gr->gr_name);
sep = " ";
pwgid_printed = 1 ;
}
continue ;
}
for (cp = gr->gr_mem; cp && *cp; cp++)
if (strcmp(*cp, user) == 0) {
printf("%s%s", sep, gr->gr_name);
sep = " ";
break;
}
}
printf("\n");
endgrent() ;
}