/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "util.h"

static int   hflag = 0;
static int   Rflag = 0;
static uid_t uid = -1;
static gid_t gid = -1;
static int   ret = 0;

static void
chownpwgr(const char *path, int depth, void *data)
{
	char *chownf_name;
	int (*chownf)(const char *, uid_t, gid_t);

	if (recurse_follow == 'P' || (recurse_follow == 'H' && depth) || (hflag && !depth)) {
		chownf_name = "lchown";
		chownf = lchown;
	} else {
		chownf_name = "chown";
		chownf = chown;
	}

	if (chownf(path, uid, gid) < 0) {
		weprintf("%s %s:", chownf_name, path);
		ret = 1;
	} else if (Rflag) {
		recurse(path, chownpwgr, depth, NULL);
	}
}

static void
usage(void)
{
	eprintf("usage: %s [-h] [-R [-H | -L | -P]] [owner][:[group]] file ...\n", argv0);
}

int
main(int argc, char *argv[])
{
	struct passwd *pw;
	struct group *gr;
	char *owner, *group;

	ARGBEGIN {
	case 'h':
		hflag = 1;
		break;
	case 'r':
	case 'R':
		Rflag = 1;
		break;
	case 'H':
	case 'L':
	case 'P':
		recurse_follow = ARGC();
		break;
	default:
		usage();
	} ARGEND;

	if (argc < 2)
		usage();

	owner = argv[0];
	if ((group = strchr(owner, ':')))
		*group++ = '\0';

	if (owner && *owner) {
		errno = 0;
		pw = getpwnam(owner);
		if (pw) {
			uid = pw->pw_uid;
		} else {
			if (errno)
				eprintf("getpwnam %s:", owner);
			uid = estrtonum(owner, 0, UINT_MAX);
		}
	}
	if (group && *group) {
		errno = 0;
		gr = getgrnam(group);
		if (gr) {
			gid = gr->gr_gid;
		} else {
			if (errno)
				eprintf("getgrnam %s:", group);
			gid = estrtonum(group, 0, UINT_MAX);
		}
	}
	for (argc--, argv++; *argv; argc--, argv++)
		chownpwgr(*argv, 0, NULL);

	return ret;
}