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/* 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;

}