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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#define _XOPEN_SOURCE 700
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grp.h>
#include <sys/stat.h>
#include <unistd.h>
#define FOLLOWCOMMANDLINE (1)
#define FOLLOWRECURSIVE (2)
#define NOFOLLOW (3)
static int chgrp(gid_t gid, const char *path, int flag)
{
(void)flag;
if (chown(path, (uid_t)-1, gid) == -1) {
fprintf(stderr, "chgrp: Couldn't change group of %s: %s\n", path, strerror(errno));
return 1;
}
return 0;
}
static gid_t strtogid(const char *s)
{
struct group *grp = getgrnam(s);
if (grp == NULL) {
gid_t gid = (gid_t)atoi(s);
if (gid == 0 && strcmp(s, "0")) {
fprintf(stderr, "chgrp: Couldn't find group %s\n", s);
exit(1);
}
return gid;
}
return grp->gr_gid;
}
int main(int argc, char **argv)
{
int c = 0, r = 0;
int changelink = 0;
int flag = 0;
int recursive = 0;
while ((c = getopt(argc, argv, "hHLPR")) != -1) {
switch (c) {
case 'h':
changelink = 1;
break;
case 'H':
flag = FOLLOWCOMMANDLINE;
break;
case 'L':
flag = FOLLOWRECURSIVE;
break;
case 'P':
flag = NOFOLLOW;
break;
case 'R':
recursive = 1;
break;
default:
return 1;
}
}
if (recursive && changelink) {
fprintf(stderr, "chgrp: Options -h and -R are mutually exclusive\n");
return 1;
}
if (optind >= argc - 1) {
fprintf(stderr, "chgrp: Group and at least one file are required\n");
return 1;
}
gid_t gid = strtogid(argv[optind++]);
while (optind < argc) {
r |= chgrp(gid, argv[optind++], flag);
}
return r;
}
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