/*      $OpenBSD: rm.c,v 1.11 2016/10/10 18:13:21 tedu Exp $    */
/*      $NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $      */

/*-
 * Copyright (c) 1990, 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 <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static int eval;

static void     checkdot(char **);
static void     rm_tree(char **);

int
rmmain(int argc, char *argv[])
{

        checkdot(argv);

        if (*argv)
                rm_tree(argv);

        return (eval);
}

static void
rm_tree(char **argv)
{
        FTS *fts;
        FTSENT *p;
        int flags;

        flags = FTS_PHYSICAL;
        flags |= FTS_NOSTAT;
        if (!(fts = fts_open(argv, flags, NULL)))
                err(1, NULL);
        while ((p = fts_read(fts)) != NULL) {
                switch (p->fts_info) {
                case FTS_DNR:
                        if (p->fts_errno != ENOENT) {
                                warnx("%s: %s",
                                    p->fts_path, strerror(p->fts_errno));
                                eval = 1;
                        }
                        continue;
                case FTS_ERR:
                        errc(1, p->fts_errno, "%s", p->fts_path);
                case FTS_D:
                        continue;
                default:
                        break;
                }

                /*
                 * If we can't read or search the directory, may still be
                 * able to remove it.  Don't print out the un{read,search}able
                 * message unless the remove fails.
                 */
                switch (p->fts_info) {
                case FTS_DP:
                case FTS_DNR:
                        if (!rmdir(p->fts_accpath) ||
                            (errno == ENOENT))
                                continue;
                        break;

                case FTS_F:
                case FTS_NSOK:
                default:
                        if (!unlink(p->fts_accpath) ||
                            (errno == ENOENT))
                                continue;
                }
                warn("%s", p->fts_path);
                eval = 1;
        }
        if (errno)
                err(1, "fts_read");
        fts_close(fts);
}

/*
 * POSIX.2 requires that if "." or ".." are specified as the basename
 * portion of an operand, a diagnostic message be written to standard
 * error and nothing more be done with such operands.
 *
 * Since POSIX.2 defines basename as the final portion of a path after
 * trailing slashes have been removed, we'll remove them here.
 */
#define ISDOT(a)        ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
static void
checkdot(char **argv)
{
        char *p, **save, **t;
        int complained;

        complained = 0;
        for (t = argv; *t;) {
                /* strip trailing slashes */
                p = strrchr (*t, '\0');
                while (--p > *t && *p == '/')
                        *p = '\0';

                /* extract basename */
                if ((p = strrchr(*t, '/')) != NULL)
                        ++p;
                else
                        p = *t;

                if (ISDOT(p)) {
                        if (!complained++)
                                warnx("\".\" and \"..\" may not be removed");
                        eval = 1;
                        for (save = t; (t[0] = t[1]) != NULL; ++t)
                                continue;
                        t = save;
                } else
                        ++t;
        }
}