bin/mv/mv.c

/*
 * Copyright (c) 1989 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)mv.c        5.11 (Berkeley) 4/3/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pathnames.h"

int fflg, iflg;

main(argc, argv)
        int argc;
        char **argv;
{
        extern char *optarg;
        extern int optind;
        register int baselen, exitval, len;
        register char *p, *endp;
        struct stat sb;
        int ch;
        char path[MAXPATHLEN + 1];

        while (((ch = getopt(argc, argv, "-if")) != EOF))
                switch((char)ch) {
                case 'i':
                        iflg = 1;
                        break;
                case 'f':
                        fflg = 1;
                        break;
                case '-':               /* undocumented; for compatibility */
                        goto endarg;
                case '?':
                default:
                        usage();
                }
endarg: argc -= optind;
        argv += optind;

        if (argc < 2)
                usage();

        /*
         * 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 (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. */
        (void)strcpy(path, argv[argc - 1]);
        baselen = strlen(path);
        endp = &path[baselen];
        *endp++ = '/';
        ++baselen;
        for (exitval = 0; --argc; ++argv) {
                if ((p = rindex(*argv, '/')) == NULL)
                        p = *argv;
                else
                        ++p;
                if ((baselen + (len = strlen(p))) >= MAXPATHLEN)
                        (void)fprintf(stderr,
                            "mv: %s: destination pathname too long\n", *argv);
                else {
                        bcopy(p, endp, len + 1);
                        exitval |= do_move(*argv, path);
                }
        }
        exit(exitval);
}

do_move(from, to)
        char *from, *to;
{
        struct stat sb;
        int ask, ch;

        /*
         * Check access.  If interactive and file exists, ask user if it
         * should be replaced.  Otherwise if file exists but isn't writable
         * make sure the user wants to clobber it.
         */
        if (!fflg && !access(to, F_OK)) {
                ask = 0;
                if (iflg) {
                        (void)fprintf(stderr, "overwrite %s? ", to);
                        ask = 1;
                }
                else if (access(to, W_OK) && !stat(to, &sb)) {
                        (void)fprintf(stderr, "override mode %o on %s? ",
                            sb.st_mode & 07777, to);
                        ask = 1;
                }
                if (ask) {
                        if ((ch = getchar()) != EOF && ch != '\n')
                                while (getchar() != '\n');
                        if (ch != 'y')
                                return(0);
                }
        }
        if (!rename(from, to))
                return(0);

        if (errno != EXDEV) {
                (void)fprintf(stderr,
                    "mv: rename %s to %s: %s\n", from, to, strerror(errno));
                return(1);
        }

        /*
         * If rename fails, and it's a regular file, do the copy internally;
         * otherwise, use cp and rm.
         */
        if (stat(from, &sb)) {
                (void)fprintf(stderr, "mv: %s: %s\n", from, strerror(errno));
                return(1);
        }
        return(S_ISREG(sb.st_mode) ?
            fastcopy(from, to, &sb) : copy(from, to));
}

fastcopy(from, to, sbp)
        char *from, *to;
        struct stat *sbp;
{
        struct timeval tval[2];
        static u_int blen;
        static char *bp;
        register int nread, from_fd, to_fd;

        if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
                error(from);
                return(1);
        }
        if ((to_fd = open(to, O_CREAT|O_TRUNC|O_WRONLY, sbp->st_mode)) < 0) {
                error(to);
                (void)close(from_fd);
                return(1);
        }
        if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
                error(NULL);
                return(1);
        }
        while ((nread = read(from_fd, bp, blen)) > 0)
                if (write(to_fd, bp, nread) != nread) {
                        error(to);
                        goto err;
                }
        if (nread < 0) {
                error(from);
err:            (void)unlink(to);
                (void)close(from_fd);
                (void)close(to_fd);
                return(1);
        }
        (void)fchown(to_fd, sbp->st_uid, sbp->st_gid);
        (void)fchmod(to_fd, sbp->st_mode);

        (void)close(from_fd);
        (void)close(to_fd);

        tval[0].tv_sec = sbp->st_atime;
        tval[1].tv_sec = sbp->st_mtime;
        tval[0].tv_usec = tval[1].tv_usec = 0;
        (void)utimes(to, tval);
        (void)unlink(from);
        return(0);
}

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

        if (!(pid = vfork())) {
                execl(_PATH_CP, "mv", "-pr", from, to, NULL);
                error(_PATH_CP);
                _exit(1);
        }
        (void)waitpid(pid, &status, 0);
        if (!WIFEXITED(status) || WEXITSTATUS(status))
                return(1);
        if (!(pid = vfork())) {
                execl(_PATH_RM, "mv", "-rf", from, NULL);
                error(_PATH_RM);
                _exit(1);
        }
        (void)waitpid(pid, &status, 0);
        return(!WIFEXITED(status) || WEXITSTATUS(status));
}

error(s)
        char *s;
{
        if (s)
                (void)fprintf(stderr, "mv: %s: %s\n", s, strerror(errno));
        else
                (void)fprintf(stderr, "mv: %s\n", strerror(errno));
}

usage()
{
        (void)fprintf(stderr,
"usage: mv [-if] src target;\n   or: mv [-if] src1 ... srcN directory\n");
        exit(1);
}