/* $NetBSD: mv.c,v 1.46 2020/06/24 16:58:12 riastradh Exp $ */

/*
 * Copyright (c) 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Smith of The State University of New York at Buffalo.
 *
 * 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mv.c        8.2 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: mv.c,v 1.46 2020/06/24 16:58:12 riastradh Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/extattr.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pathnames.h"

static int fflg, hflg, iflg, vflg;
static int stdin_ok;
static sig_atomic_t pinfo;

static int      copy(char *, char *);
static int      do_move(char *, char *);
static int      fastcopy(char *, char *, struct stat *);
__dead static void      usage(void);

static void
progress(int sig __unused)
{

        pinfo++;
}

int
main(int argc, char *argv[])
{
        int ch, len, rval;
        char *p, *endp;
        struct stat sb;
        char path[MAXPATHLEN + 1];
        size_t baselen;

        setprogname(argv[0]);
        (void)setlocale(LC_ALL, "");

        while ((ch = getopt(argc, argv, "hifv")) != -1)
                switch (ch) {
                case 'h':
                        hflg = 1;
                        break;
                case 'i':
                        fflg = 0;
                        iflg = 1;
                        break;
                case 'f':
                        iflg = 0;
                        fflg = 1;
                        break;
                case 'v':
                        vflg = 1;
                        break;
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc < 2)
                usage();

        stdin_ok = isatty(STDIN_FILENO);

        (void)signal(SIGINFO, progress);

        /*
         * If the stat on the target fails or the target isn't a directory,
         * try the move.  More than 2 arguments is an error in this case.
         */
        if (hflg || stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
                if (argc > 2)
                        usage();
                exit(do_move(argv[0], argv[1]));
        }

        /* It's a directory, move each file into it. */
        baselen = strlcpy(path, argv[argc - 1], sizeof(path));
        if (baselen >= sizeof(path))
                errx(1, "%s: destination pathname too long", argv[argc - 1]);
        endp = &path[baselen];
        if (!baselen || *(endp - 1) != '/') {
                *endp++ = '/';
                ++baselen;
        }
        for (rval = 0; --argc; ++argv) {
                p = *argv + strlen(*argv) - 1;
                while (*p == '/' && p != *argv)
                        *p-- = '\0';
                if ((p = strrchr(*argv, '/')) == NULL)
                        p = *argv;
                else
                        ++p;

                if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
                        warnx("%s: destination pathname too long", *argv);
                        rval = 1;
                } else {
                        memmove(endp, p, len + 1);
                        if (do_move(*argv, path))
                                rval = 1;
                }
        }
        exit(rval);
        /* NOTREACHED */
}

static int
do_move(char *from, char *to)
{
        struct stat sb;
        char modep[15];

        /*
         * (1)  If the destination path exists, the -f option is not specified
         *      and either of the following conditions are true:
         *
         *      (a) The permissions of the destination path do not permit
         *          writing and the standard input is a terminal.
         *      (b) The -i option is specified.
         *
         *      the mv utility shall write a prompt to standard error and
         *      read a line from standard input.  If the response is not
         *      affirmative, mv shall do nothing more with the current
         *      source file...
         */
        if (!fflg && !access(to, F_OK)) {
                int ask = 1;
                int ch;

                if (iflg) {
                        if (access(from, F_OK)) {
                                warn("rename %s", from);
                                return (1);
                        }
                        (void)fprintf(stderr, "overwrite %s? ", to);
                } else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
                        if (access(from, F_OK)) {
                                warn("rename %s", from);
                                return (1);
                        }
                        strmode(sb.st_mode, modep);
                        (void)fprintf(stderr, "override %s%s%s/%s for %s? ",
                            modep + 1, modep[9] == ' ' ? "" : " ",
                            user_from_uid(sb.st_uid, 0),
                            group_from_gid(sb.st_gid, 0), to);
                } else
                        ask = 0;
                if (ask) {
                        if ((ch = getchar()) != EOF && ch != '\n') {
                                int ch2;
                                while ((ch2 = getchar()) != EOF && ch2 != '\n')
                                        continue;
                        }
                        if (ch != 'y' && ch != 'Y')
                                return (0);
                }
        }

        /*
         * (2)  If rename() succeeds, mv shall do nothing more with the
         *      current source file.  If it fails for any other reason than
         *      EXDEV, mv shall write a diagnostic message to the standard
         *      error and do nothing more with the current source file.
         *
         * (3)  If the destination path exists, and it is a file of type
         *      directory and source_file is not a file of type directory,
         *      or it is a file not of type directory, and source file is
         *      a file of type directory, mv shall write a diagnostic
         *      message to standard error, and do nothing more with the
         *      current source file...
         */
        if (!rename(from, to)) {
                if (vflg)
                        printf("%s -> %s\n", from, to);
                return (0);
        }

        if (errno != EXDEV) {
                warn("rename %s to %s", from, to);
                return (1);
        }

        /*
         * (4)  If the destination path exists, mv shall attempt to remove it.
         *      If this fails for any reason, mv shall write a diagnostic
         *      message to the standard error and do nothing more with the
         *      current source file...
         */
        if (!lstat(to, &sb)) {
                if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
                        warn("can't remove %s", to);
                        return (1);
                }
        }

        /*
         * (5)  The file hierarchy rooted in source_file shall be duplicated
         *      as a file hierarchy rooted in the destination path...
         */
        if (lstat(from, &sb)) {
                warn("%s", from);
                return (1);
        }

        return (S_ISREG(sb.st_mode) ?
            fastcopy(from, to, &sb) : copy(from, to));
}

static int
fastcopy(char *from, char *to, struct stat *sbp)
{
#if defined(__NetBSD__)
        struct timespec ts[2];
#else
        struct timeval tval[2];
#endif
        static blksize_t blen;
        static char *bp;
        int from_fd, to_fd;
        ssize_t nread;
        off_t total = 0;

        if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
                warn("%s", from);
                return (1);
        }
        if ((to_fd =
            open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
                warn("%s", to);
                (void)close(from_fd);
                return (1);
        }
        if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
                warn(NULL);
                blen = 0;
                (void)close(from_fd);
                (void)close(to_fd);
                return (1);
        }
        while ((nread = read(from_fd, bp, blen)) > 0) {
                if (write(to_fd, bp, nread) != nread) {
                        warn("%s", to);
                        goto err;
                }
                total += nread;
                if (pinfo) {
                        int pcent = (int)((100.0 * total) / sbp->st_size);

                        pinfo = 0;
                        (void)fprintf(stderr, "%s => %s %llu/%llu bytes %d%% "
                            "written\n", from, to, (unsigned long long)total,
                            (unsigned long long)sbp->st_size, pcent);
                }
        }
        if (nread < 0) {
                warn("%s", from);
err:            if (unlink(to))
                        warn("%s: remove", to);
                (void)close(from_fd);
                (void)close(to_fd);
                return (1);
        }

        if (fcpxattr(from_fd, to_fd) == -1)
                warn("%s: error copying extended attributes", to);

        (void)close(from_fd);
#ifdef BSD4_4
#if defined(__NetBSD__)
        ts[0] = sbp->st_atimespec;
        ts[1] = sbp->st_mtimespec;
#else
        TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
        TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
#endif
#else
        tval[0].tv_sec = sbp->st_atime;
        tval[1].tv_sec = sbp->st_mtime;
        tval[0].tv_usec = 0;
        tval[1].tv_usec = 0;
#endif
#ifdef __SVR4
        if (utimes(to, tval))
#else
#if defined(__NetBSD__)
        if (futimens(to_fd, ts))
#else
        if (futimes(to_fd, tval))
#endif
#endif
                warn("%s: set times", to);
        if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
                if (errno != EPERM)
                        warn("%s: set owner/group", to);
                sbp->st_mode &= ~(S_ISUID | S_ISGID);
        }
        if (fchmod(to_fd, sbp->st_mode))
                warn("%s: set mode", to);
        if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
                warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);

        if (close(to_fd)) {
                warn("%s", to);
                return (1);
        }

        if (unlink(from)) {
                warn("%s: remove", from);
                return (1);
        }

        if (vflg)
                printf("%s -> %s\n", from, to);

        return (0);
}

static int
copy(char *from, char *to)
{
        pid_t pid;
        int status;

        if ((pid = vfork()) == 0) {
                execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, NULL);
                warn("%s", _PATH_CP);
                _exit(1);
        }
        if (waitpid(pid, &status, 0) == -1) {
                warn("%s: waitpid", _PATH_CP);
                return (1);
        }
        if (!WIFEXITED(status)) {
                warnx("%s: did not terminate normally", _PATH_CP);
                return (1);
        }
        if (WEXITSTATUS(status)) {
                warnx("%s: terminated with %d (non-zero) status",
                    _PATH_CP, WEXITSTATUS(status));
                return (1);
        }
        if (!(pid = vfork())) {
                execl(_PATH_RM, "mv", "-rf", "--", from, NULL);
                warn("%s", _PATH_RM);
                _exit(1);
        }
        if (waitpid(pid, &status, 0) == -1) {
                warn("%s: waitpid", _PATH_RM);
                return (1);
        }
        if (!WIFEXITED(status)) {
                warnx("%s: did not terminate normally", _PATH_RM);
                return (1);
        }
        if (WEXITSTATUS(status)) {
                warnx("%s: terminated with %d (non-zero) status",
                    _PATH_RM, WEXITSTATUS(status));
                return (1);
        }
        return (0);
}

static void
usage(void)
{
        (void)fprintf(stderr, "usage: %s [-fhiv] source target\n"
            "       %s [-fiv] source ... directory\n", getprogname(),
            getprogname());
        exit(1);
        /* NOTREACHED */
}