/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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/types.h>
#include <sys/stat.h>

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

static volatile sig_atomic_t siginfo;

static void usage(void) __dead2;

static void
siginfo_handler(int sig __unused)
{

        siginfo = 1;
}

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

        Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0;
        while ((ch = getopt(argc, argv, "HLPRfhvx")) != -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 'f':
                        fflag = 1;
                        break;
                case 'h':
                        hflag = 1;
                        break;
                case 'v':
                        vflag++;
                        break;
                case 'x':
                        xflag = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argv += optind;
        argc -= optind;

        if (argc < 2)
                usage();

        (void)signal(SIGINFO, siginfo_handler);

        if (Rflag) {
                if (hflag)
                        errx(1, "the -R and -h options may not be "
                            "specified together.");
                if (Lflag) {
                        fts_options = FTS_LOGICAL;
                } else {
                        fts_options = FTS_PHYSICAL;

                        if (Hflag) {
                                fts_options |= FTS_COMFOLLOW;
                        }
                }
        } else if (hflag) {
                fts_options = FTS_PHYSICAL;
        } else {
                fts_options = FTS_LOGICAL;
        }
        if (xflag)
                fts_options |= FTS_XDEV;

        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 (strtofflags(&flags, &set, &clear))
                        errx(1, "invalid flag: %s", flags);
                clear = ~clear;
                oct = 0;
        }

        if ((ftsp = fts_open(++argv, fts_options , 0)) == NULL)
                err(1, NULL);

        for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) {
                int atflag;

                if ((fts_options & FTS_LOGICAL) ||
                    ((fts_options & FTS_COMFOLLOW) &&
                    p->fts_level == FTS_ROOTLEVEL))
                        atflag = 0;
                else
                        atflag = AT_SYMLINK_NOFOLLOW;

                switch (p->fts_info) {
                case FTS_D:     /* Change it at FTS_DP if we're recursive. */
                        if (!Rflag)
                                fts_set(ftsp, p, FTS_SKIP);
                        continue;
                case FTS_DNR:                   /* Warn, chflags. */
                        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;
                default:
                        break;
                }
                if (oct)
                        newflags = set;
                else
                        newflags = (p->fts_statp->st_flags | set) & clear;
                if (newflags == p->fts_statp->st_flags)
                        continue;
                if (chflagsat(AT_FDCWD, p->fts_accpath, newflags,
                    atflag) == -1) {
                        e = errno;
                        if (!fflag) {
                                warnc(e, "%s", p->fts_path);
                                rval = 1;
                        }
                        if (siginfo) {
                                (void)printf("%s: %s\n", p->fts_path,
                                    strerror(e));
                                siginfo = 0;
                        }
                } else if (vflag || siginfo) {
                        (void)printf("%s", p->fts_path);
                        if (vflag > 1 || siginfo)
                                (void)printf(": 0%lo -> 0%lo",
                                    (u_long)p->fts_statp->st_flags,
                                    newflags);
                        (void)printf("\n");
                        siginfo = 0;
                }
        }
        if (errno)
                err(1, "fts_read");
        exit(rval);
}

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