/*      $OpenBSD: main.c,v 1.33 2022/12/04 23:50:48 cheloha Exp $       */

/*-
 * Copyright (c) 1990, 1993
 *      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 <time.h>
#include <unistd.h>

#include "find.h"

time_t now;                     /* time find was run */
int dotfd;                      /* starting directory; may be -1 */
int ftsoptions;                 /* options for the fts_open(3) call */
int isdelete;                   /* user specified -delete operator */
int isdepth;                    /* do directories on post-order visit */
int isoutput;                   /* user specified output operator */
int isxargs;                    /* don't permit xargs delimiting chars */

__dead static void usage(void);

int
main(int argc, char *argv[])
{
        struct sigaction sa;
        char **p, **paths, **paths2;
        int ch;

        memset(&sa, 0, sizeof sa);
        sa.sa_handler = show_path;
        sa.sa_flags = SA_RESTART; 

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

        p = paths = ereallocarray(NULL, argc, sizeof(char *));

        sigaction(SIGINFO, &sa, NULL);

        ftsoptions = FTS_NOSTAT|FTS_PHYSICAL;
        while ((ch = getopt(argc, argv, "Hdf:hLXx")) != -1)
                switch(ch) {
                case 'H':
                        ftsoptions |= FTS_COMFOLLOW;
                        ftsoptions |= FTS_PHYSICAL;
                        ftsoptions &= ~FTS_LOGICAL;
                        break;
                case 'd':
                        isdepth = 1;
                        break;
                case 'f':
                        *p++ = optarg;
                        break;
                case 'h':
                case 'L':
                        ftsoptions &= ~FTS_COMFOLLOW;
                        ftsoptions &= ~FTS_PHYSICAL;
                        ftsoptions |= FTS_LOGICAL;
                        break;
                case 'X':
                        isxargs = 1;
                        break;
                case 'x':
                        ftsoptions &= ~FTS_NOSTAT;
                        ftsoptions |= FTS_XDEV;
                        break;
                default:
                        usage();
                }

        argc -= optind; 
        argv += optind;

        /* The first argument that starts with a -, or is a ! or a (, and all
         * subsequent arguments shall be interpreted as an expression ...
         * (POSIX.2).
         */
        while (*argv) {
                if (**argv == '-' ||
                    ((**argv == '!' || **argv == '(') && (*argv)[1] == '\0'))
                        break;
                *p++ = *argv++;
        }

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

        if (!(paths2 = reallocarray(paths, p - paths + 1, sizeof(char *))))
                err(1, NULL);
        paths = paths2;

        dotfd = open(".", O_RDONLY);

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

static void
usage(void)
{
        (void)fprintf(stderr,
            "usage: find [-dHhLXx] [-f path] path ... [expression]\n");
        exit(1);
}