/*      $OpenBSD: makeinodes.c,v 1.2 2021/07/18 11:25:47 schwarze Exp $ */
/*
 * Copyright (c) 2016, 2021 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define HSIZE    64

int
main(int argc, char *argv[])
{
        struct stat      sb1, sb2;
        long long        diff;
        int              fd, rev;

        if (argc > 1 && strcmp(argv[1], "-r") == 0) {
                rev = 1;
                argc--;
                argv++;
        } else
                rev = 0;

        if (argc != 2) {
                fputs("usage: makeinodes [-r] dirname\n", stderr);
                return 1;
        }
        if (mkdir(argv[1], 0755) == -1)
                err(1, "mkdir(%s)", argv[1]);
        if (chdir(argv[1]) == -1)
                err(1, "chdir(%s)", argv[1]);
        if (mkdir("man1", 0755) == -1)
                err(1, "mkdir(man1)");
        if (chdir("man1") == -1)
                err(1, "chdir(man1)");
        if ((fd = open("1", O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1)
                err(1, "open(1)");
        if (fstat(fd, &sb1) == -1)
                err(1, "fstat(1)");
        if (close(fd) == -1)
                err(1, "close(1)");
        if ((fd = open("2", O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1)
                err(1, "open(2)");
        if (fstat(fd, &sb2) == -1)
                err(1, "fstat(2)");
        if (close(fd) == -1)
                err(1, "close(2)");
        while ((diff = sb2.st_ino % HSIZE - sb1.st_ino % HSIZE) == 0) {
                if ((fd = open("3", O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1)
                        err(1, "open(3)");
                if (fstat(fd, &sb2) == -1)
                        err(1, "fstat(3)");
                if (close(fd) == -1)
                        err(1, "close(3)");
                if (rename("3", "2") == -1)
                        err(1, "rename(3, 2)");
        }
        if ((diff < 0) == rev) {
                if (rename("1", "one.1") == -1)
                        err(1, "rename(1, one)");
                if (rename("2", "two.1") == -1)
                        err(1, "rename(2, two)");
        } else {
                if (rename("2", "one.1") == -1)
                        err(1, "rename(2, one)");
                if (rename("1", "two.1") == -1)
                        err(1, "rename(1, two)");
        }
        return 0;
}