/*      $NetBSD: chflags.c,v 1.18 2023/05/05 04:14:02 kre Exp $ */

/*
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "from: @(#)chflags.c     8.5 (Berkeley) 4/1/94";
#else
__RCSID("$NetBSD: chflags.c,v 1.18 2023/05/05 04:14:02 kre Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

__dead static void      usage(void);

int
main(int argc, char *argv[])
{
        FTS *ftsp;
        FTSENT *p;
        u_long clear, set, newflags;
        long val;
        int Hflag, Lflag, Rflag, ch, fts_options, dflag, hflag, oct, rval;
        char *flags, *ep;
        int (*change_flags)(const char *, u_long);

        Hflag = Lflag = Rflag = dflag = hflag = 0;
        while ((ch = getopt(argc, argv, "HLPRdh")) != -1)
                switch (ch) {
                case 'H':
                        Hflag = 1;
                        Lflag = 0;
                        break;
                case 'L':
                        Lflag = 1;
                        Hflag = 0;
                        break;
                case 'P':
                        Hflag = Lflag = 0;
                        break;
                case 'R':
                        Rflag = 1;
                        break;
                case 'd':
                        dflag = 1;
                        break;
                case 'h':
                        hflag = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argv += optind;
        argc -= optind;

        if (argc < 2)
                usage();

        fts_options = FTS_PHYSICAL;
        if (Rflag) {
                if (Hflag)
                        fts_options |= FTS_COMFOLLOW;
                if (Lflag) {
                        fts_options &= ~FTS_PHYSICAL;
                        fts_options |= FTS_LOGICAL;
                }
        } else if (!hflag)
                fts_options |= FTS_COMFOLLOW;

        flags = *argv;
        if (*flags >= '0' && *flags <= '7') {
                errno = 0;
                val = strtol(flags, &ep, 8);
                if (val < 0)
                        errno = ERANGE;
                if (errno)
                        err(1, "invalid flags: %s", flags);
                if (*ep)
                        errx(1, "invalid flags: %s", flags);
                set = val;
                oct = 1;
        } else {
                if (string_to_flags(&flags, &set, &clear))
                        errx(1, "invalid flag: %s", flags);
                clear = ~clear;
                oct = 0;
        }

        if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL)
                err(1, "fts_open");

        for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
                change_flags = chflags;
                switch (p->fts_info) {
                case FTS_D:
                        if (Rflag)              /* Change it at FTS_DP. */
                                continue;
                        fts_set(ftsp, p, FTS_SKIP);
                        break;
                case FTS_DNR:                   /* Warn, chflag, continue. */
                        warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
                        rval = 1;
                        break;
                case FTS_ERR:                   /* Warn, continue. */
                case FTS_NS:
                        warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
                        rval = 1;
                        continue;
                case FTS_SL:                    /* Ignore unless -h. */
                        /*
                         * All symlinks we found while doing a physical
                         * walk end up here.
                         */
                        if (!hflag)
                                continue;
                        /*
                         * Note that if we follow a symlink, fts_info is
                         * not FTS_SL but FTS_F or whatever.  And we should
                         * use lchflags only for FTS_SL and should use chflags
                         * for others.
                         */
                        change_flags = lchflags;
                        break;
                case FTS_SLNONE:                /* Ignore. */
                        /*
                         * The only symlinks that end up here are ones that
                         * don't point to anything.  Note that if we are
                         * doing a physical walk, we never reach here unless
                         * we asked to follow explicitly.
                         */
                        continue;
                default:
                        break;
                }
                if (oct)
                        newflags = set;
                else {
                        newflags = p->fts_statp->st_flags;
                        newflags |= set;
                        newflags &= clear;
                }
                if (dflag && newflags == p->fts_statp->st_flags)
                        continue;
                if ((*change_flags)(p->fts_accpath, newflags)) {
                        warn("%s", p->fts_path);
                        rval = 1;
                }
        }
        if (errno)
                err(1, "fts_read");
        exit(rval);
}

static void
usage(void)
{

        (void)fprintf(stderr,
            "usage: chflags [-R [-H | -L | -P]] [-dh] flags file ...\n");
        exit(1);
}