Subversion Repositories HelenOS

/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of the original program's authors 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <fcntl.h>
#include "config.h"
#include "util.h"
#include "errors.h"
#include "entry.h"
#include "cp.h"
#include "cmds.h"

#define CP_VERSION "0.0.1"
#define CP_DEFAULT_BUFLEN  1024

static const char *cmdname = "cp";

static struct option const long_options[] = {
    { "buffer", required_argument, 0, 'b' },
    { "force", no_argument, 0, 'f' },
    { "recursive", no_argument, 0, 'r' },
    { "help", no_argument, 0, 'h' },
    { "version", no_argument, 0, 'v' },
    { "verbose", no_argument, 0, 'V' },
    { 0, 0, 0, 0 }
};

static int strtoint(const char *s1)
{
    long t1;

    if (-1 == (t1 = strtol(s1, (char **) NULL, 10)))
        return -1;

    if (t1 <= 0)
        return -1;

    return (int) t1;
}

static int64_t copy_file(const char *src, const char *dest, size_t blen, int vb)
{
    int fd1, fd2, bytes = 0;
    off_t total = 0;
    int64_t copied = 0;
    char *buff = NULL;

    if (vb)
        printf("Copying %s to %s\n", src, dest);

    if (-1 == (fd1 = open(src, O_RDONLY))) {
        printf("Unable to open source file %s\n", src);
        return -1;
    }

    if (-1 == (fd2 = open(dest, O_CREAT))) {
        printf("Unable to open destination file %s\n", dest);
        close(fd1);
        return -1;
    }

    total = lseek(fd1, 0, SEEK_END);

    if (vb)
        printf("%d bytes to copy\n", total);

    lseek(fd1, 0, SEEK_SET);

    if (NULL == (buff = (char *) malloc(blen))) {
        printf("Unable to allocate enough memory to read %s\n",
            src);
        copied = -1;
        goto out;
    }

    for (;;) {
        ssize_t res;

        bytes = read(fd1, buff, blen);
        if (bytes <= 0)
            break;
        copied += bytes;
        res = bytes;
        do {
            /*
             * Theoretically, it may not be enough to call write()
             * only once. Also the previous read() may have
             * returned less data than requested.
             */
            bytes = write(fd2, buff, res);
            if (bytes < 0)
                goto err;
            res -= bytes;
        } while (res > 0);

        /* TODO: re-insert assert() once this is stand alone,
         * removed as abort() exits the entire shell
         */
        if (res != 0) {
            printf("\n%d more bytes than actually exist were copied\n", res);
            goto err;
        }
    }

    if (bytes < 0) {
err:
        printf("\nError copying %s, (%d)\n", src, bytes);
        copied = bytes;
    }

out:
    close(fd1);
    close(fd2);
    if (buff)
        free(buff);
    return copied;
}

void help_cmd_cp(unsigned int level)
{
    static char helpfmt[] =
        "Usage:  %s [options] <source> <dest>\n"
        "Options: (* indicates not yet implemented)\n"
        "  -h, --help       A short option summary\n"
        "  -v, --version    Print version information and exit\n"
        "* -V, --verbose    Be annoyingly noisy about what's being done\n"
        "* -f, --force      Do not complain when <dest> exists\n"
        "* -r, --recursive  Copy entire directories\n"
        "  -b, --buffer ## Set the read buffer size to ##\n"
        "Currently, %s is under development, some options may not work.\n";
    if (level == HELP_SHORT) {
        printf("`%s' copies files and directories\n", cmdname);
    } else {
        help_cmd_cp(HELP_SHORT);
        printf(helpfmt, cmdname, cmdname);
    }

    return;
}

int cmd_cp(char **argv)
{
    unsigned int argc, buffer = 0, verbose = 0;
    int c, opt_ind;
    int64_t ret;

    argc = cli_count_args(argv);

    for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
        c = getopt_long(argc, argv, "hvVfrb:", long_options, &opt_ind);
        switch (c) { 
        case 'h':
            help_cmd_cp(1);
            return CMD_SUCCESS;
        case 'v':
            printf("%d\n", CP_VERSION);
            return CMD_SUCCESS;
        case 'V':
            verbose = 1;
            break;
        case 'f':
            break;
        case 'r':
            break;
        case 'b':
            if (-1 == (buffer = strtoint(optarg))) {
                printf("%s: Invalid buffer specification, "
                    "(should be a number greater than zero)\n",
                    cmdname);
                return CMD_FAILURE;
            }
            if (verbose)
                printf("Buffer = %d\n", buffer);
            break;
        }
    }

    if (buffer == 0)
        buffer = CP_DEFAULT_BUFLEN;

    argc -= optind;

    if (argc != 2) {
        printf("%s: invalid number of arguments. Try %s --help\n",
            cmdname, cmdname);
        return CMD_FAILURE;
    }

    ret = copy_file(argv[optind], argv[optind + 1], buffer, verbose);

    if (verbose)
        printf("%d bytes copied\n", ret);

    if (ret >= 0)
        return CMD_SUCCESS;
    else
        return CMD_FAILURE;
}