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#include "args.h"
#include "command.h"
#include "lslib.h"
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void help (void) {
printf("Usage: groups [USER]\n\n");
printf("Print the groups USER is in\n");
}
COMMAND(groups) {
uid_t uid;
int ngroups, i;
gid_t* groups;
struct passwd* pw;
parse_help(argc, argv, help);
if (argc < 1) {
uid = getuid();
pw = getpwuid(uid);
} else {
pw = getpwnam(argv[0]);
}
if(pw == NULL){
if (errno == 0) {
error("user not found");
} else {
error("failed to fetch groups: %s", strerror(errno));
}
}
ngroups = 0;
getgrouplist(pw->pw_name, pw->pw_gid, NULL, &ngroups);
groups = malloc(sizeof(gid_t) * ngroups);
getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
for (i = 0; i < ngroups; i++){
struct group* gr = getgrgid(groups[i]);
if(gr == NULL) {
free(groups);
error("failed to fetch groups: %s", strerror(errno));
}
printf("%s ",gr->gr_name);
}
printf("\n");
free(groups);
return EXIT_SUCCESS;
}
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