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	chown.c - sbase - suckless unix tools
	git clone git://git.suckless.org/sbase
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	---
	chown.c (1992B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <errno.h>
	3 #include <fcntl.h>
	4 #include <grp.h>
	5 #include <limits.h>
	6 #include <pwd.h>
	7 #include <stdlib.h>
	8 #include <string.h>
	9 #include <unistd.h>
	10
	11 #include "fs.h"
	12 #include "util.h"
	13
	14 static int hflag = 0;
	15 static uid_t uid = -1;
	16 static gid_t gid = -1;
	17 static int ret = 0;
	18
	19 static void
	20 chownpwgr(int dirfd, const char name, struct stat st, void *data, stru…
	21 {
	22 int flags = 0;
	23
	24 if ((r->maxdepth == 0 && r->follow == 'P') \|\| (r->follow == 'H' …
	25 flags \|= AT_SYMLINK_NOFOLLOW;
	26
	27 if (fchownat(dirfd, name, uid, gid, flags) < 0) {
	28 weprintf("chown %s:", r->path);
	29 ret = 1;
	30 } else if (S_ISDIR(st->st_mode)) {
	31 recurse(dirfd, name, NULL, r);
	32 }
	33 }
	34
	35 static void
	36 usage(void)
	37 {
	38 eprintf("usage: %s [-h] [-R [-H \| -L \| -P]] owner[:[group]] file…
	39 " %s [-h] [-R [-H \| -L \| -P]] :group file ...\n",
	40 argv0, argv0);
	41 }
	42
	43 int
	44 main(int argc, char *argv[])
	45 {
	46 struct group *gr;
	47 struct passwd *pw;
	48 struct recursor r = { .fn = chownpwgr, .maxdepth = 1, .follow = …
	49 char owner, group;
	50
	51 ARGBEGIN {
	52 case 'h':
	53 hflag = 1;
	54 break;
	55 case 'r':
	56 case 'R':
	57 r.maxdepth = 0;
	58 break;
	59 case 'H':
	60 case 'L':
	61 case 'P':
	62 r.follow = ARGC();
	63 break;
	64 default:
	65 usage();
	66 } ARGEND
	67
	68 if (argc < 2)
	69 usage();
	70
	71 owner = argv[0];
	72 if ((group = strchr(owner, ':')))
	73 *group++ = '\0';
	74
	75 if (owner && *owner) {
	76 errno = 0;
	77 pw = getpwnam(owner);
	78 if (pw) {
	79 uid = pw->pw_uid;
	80 } else {
	81 if (errno)
	82 eprintf("getpwnam %s:", owner);
	83 uid = estrtonum(owner, 0, UINT_MAX);
	84 }
	85 }
	86 if (group && *group) {
	87 errno = 0;
	88 gr = getgrnam(group);
	89 if (gr) {
	90 gid = gr->gr_gid;
	91 } else {
	92 if (errno)
	93 eprintf("getgrnam %s:", group);
	94 gid = estrtonum(group, 0, UINT_MAX);
	95 }
	96 }
	97 if (uid == (uid_t)-1 && gid == (gid_t)-1)
	98 usage();
	99
	100 for (argc--, argv++; *argv; argc--, argv++)
	101 recurse(AT_FDCWD, *argv, NULL, &r);
	102
	103 return ret \|\| recurse_status;
	104 }