/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1990, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Cimarron D. Taylor of the University of California, Berkeley.
 *
 * 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 <locale.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#include "find.h"

time_t now;                     /* time find was run */
int dotfd;                      /* starting directory */
int ftsoptions;                 /* options for the ftsopen(3) call */
int ignore_readdir_race;        /* ignore readdir race */
int isdepth;                    /* do directories on post-order visit */
int isoutput;                   /* user specified output operator */
int issort;                     /* do hierarchies in lexicographical order */
int isxargs;                    /* don't permit xargs delimiting chars */
int mindepth = -1, maxdepth = -1; /* minimum and maximum depth */
int regexp_flags = REG_BASIC;   /* use the "basic" regexp by default*/
int exitstatus;
volatile sig_atomic_t showinfo = 0;

static void usage(void) __dead2;
static void siginfo_handler(int sig __unused);

int
main(int argc, char *argv[])
{
        char **p, **start;
        int Hflag, Lflag, ch;

        (void)setlocale(LC_ALL, "");

        (void)time(&now);       /* initialize the time-of-day */

        (void)signal(SIGINFO, siginfo_handler);

        p = start = argv;
        Hflag = Lflag = 0;
        ftsoptions = FTS_NOSTAT | FTS_PHYSICAL;
        while ((ch = getopt(argc, argv, "EHLPXdf:sx")) != -1)
                switch (ch) {
                case 'E':
                        regexp_flags |= REG_EXTENDED;
                        break;
                case 'H':
                        Hflag = 1;
                        Lflag = 0;
                        break;
                case 'L':
                        Lflag = 1;
                        Hflag = 0;
                        break;
                case 'P':
                        Hflag = Lflag = 0;
                        break;
                case 'X':
                        isxargs = 1;
                        break;
                case 'd':
                        isdepth = 1;
                        break;
                case 'f':
                        *p++ = optarg;
                        break;
                case 's':
                        issort = 1;
                        break;
                case 'x':
                        ftsoptions |= FTS_XDEV;
                        break;
                case '?':
                default:
                        usage();
                }

        argc -= optind;
        argv += optind;

        if (Hflag)
                ftsoptions |= FTS_COMFOLLOW;
        if (Lflag) {
                ftsoptions &= ~FTS_PHYSICAL;
                ftsoptions |= FTS_LOGICAL;
        }

        /*
         * Find first option to delimit the file list.  The first argument
         * that starts with a -, or is a ! or a ( must be interpreted as a
         * part of the find expression, according to POSIX .2.
         */
        for (; *argv != NULL; *p++ = *argv++) {
                if (argv[0][0] == '-')
                        break;
                if ((argv[0][0] == '!' || argv[0][0] == '(') &&
                    argv[0][1] == '\0')
                        break;
        }

        if (p == start)
                usage();
        *p = NULL;

        if ((dotfd = open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
                ftsoptions |= FTS_NOCHDIR;

        exit(find_execute(find_formplan(argv), start));
}

static void
usage(void)
{
        (void)fprintf(stderr, "%s\n%s\n",
"usage: find [-H | -L | -P] [-EXdsx] [-f path] path ... [expression]",
"       find [-H | -L | -P] [-EXdsx] -f path [path ...] [expression]");
        exit(1);
}

static void
siginfo_handler(int sig __unused)
{
        showinfo = 1;
}