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