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3420 post 1
/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * Redistributions of source code must retain the above copyright notice, this
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 * list of conditions and the following disclaimer.
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 *
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 * Redistributions in binary form must reproduce the above copyright notice,
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 * this list of conditions and the following disclaimer in the documentation
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 * and/or other materials provided with the distribution.
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 *
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 * Neither the name of the original program's authors nor the names of its
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 * contributors may be used to endorse or promote products derived from this
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 * software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <stdio.h>
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#include <stdlib.h>
3674 svoboda 33
#include <unistd.h>
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#include <getopt.h>
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#include <string.h>
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#include <fcntl.h>
3420 post 37
#include "config.h"
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#include "util.h"
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#include "errors.h"
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#include "entry.h"
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#include "cp.h"
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#include "cmds.h"
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3674 svoboda 44
#define CP_VERSION "0.0.1"
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#define CP_DEFAULT_BUFLEN  1024
3420 post 46
 
3674 svoboda 47
static const char *cmdname = "cp";
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static struct option const long_options[] = {
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    { "buffer", required_argument, 0, 'b' },
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    { "force", no_argument, 0, 'f' },
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    { "recursive", no_argument, 0, 'r' },
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    { "help", no_argument, 0, 'h' },
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    { "version", no_argument, 0, 'v' },
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    { "verbose", no_argument, 0, 'V' },
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    { 0, 0, 0, 0 }
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};
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static int strtoint(const char *s1)
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{
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    long t1;
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    if (-1 == (t1 = strtol(s1, (char **) NULL, 10)))
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        return -1;
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    if (t1 <= 0)
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        return -1;
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    return (int) t1;
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}
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4341 svoboda 72
static int64_t copy_file(const char *src, const char *dest,
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    size_t blen, int vb)
3674 svoboda 74
{
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    int fd1, fd2, bytes = 0;
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    off_t total = 0;
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    int64_t copied = 0;
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    char *buff = NULL;
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    if (vb)
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        printf("Copying %s to %s\n", src, dest);
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    if (-1 == (fd1 = open(src, O_RDONLY))) {
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        printf("Unable to open source file %s\n", src);
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        return -1;
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    }
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    if (-1 == (fd2 = open(dest, O_CREAT))) {
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        printf("Unable to open destination file %s\n", dest);
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        close(fd1);
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        return -1;
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    }
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    total = lseek(fd1, 0, SEEK_END);
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    if (vb)
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        printf("%d bytes to copy\n", total);
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    lseek(fd1, 0, SEEK_SET);
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    if (NULL == (buff = (char *) malloc(blen))) {
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        printf("Unable to allocate enough memory to read %s\n",
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            src);
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        copied = -1;
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        goto out;
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    }
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    for (;;) {
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        ssize_t res;
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        bytes = read(fd1, buff, blen);
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        if (bytes <= 0)
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            break;
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        copied += bytes;
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        res = bytes;
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        do {
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            /*
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             * Theoretically, it may not be enough to call write()
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             * only once. Also the previous read() may have
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             * returned less data than requested.
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             */
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            bytes = write(fd2, buff, res);
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            if (bytes < 0)
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                goto err;
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            res -= bytes;
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        } while (res > 0);
4341 svoboda 127
 
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        /* TODO: re-insert assert() once this is stand alone,
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         * removed as abort() exits the entire shell
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         */
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        if (res != 0) {
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            printf("\n%d more bytes than actually exist were copied\n", res);
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            goto err;
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        }
3674 svoboda 135
    }
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    if (bytes < 0) {
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err:
4341 svoboda 139
        printf("\nError copying %s, (%d)\n", src, bytes);
3674 svoboda 140
        copied = bytes;
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    }
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out:
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    close(fd1);
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    close(fd2);
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    if (buff)
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        free(buff);
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    return copied;
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}
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3420 post 151
void help_cmd_cp(unsigned int level)
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{
3674 svoboda 153
    static char helpfmt[] =
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        "Usage:  %s [options] <source> <dest>\n"
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        "Options: (* indicates not yet implemented)\n"
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        "  -h, --help       A short option summary\n"
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        "  -v, --version    Print version information and exit\n"
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        "* -V, --verbose    Be annoyingly noisy about what's being done\n"
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        "* -f, --force      Do not complain when <dest> exists\n"
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        "* -r, --recursive  Copy entire directories\n"
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        "  -b, --buffer ## Set the read buffer size to ##\n"
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        "Currently, %s is under development, some options may not work.\n";
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    if (level == HELP_SHORT) {
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        printf("`%s' copies files and directories\n", cmdname);
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    } else {
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        help_cmd_cp(HELP_SHORT);
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        printf(helpfmt, cmdname, cmdname);
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    }
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3420 post 170
    return;
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}
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int cmd_cp(char **argv)
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{
3674 svoboda 175
    unsigned int argc, buffer = 0, verbose = 0;
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    int c, opt_ind;
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    int64_t ret;
3420 post 178
 
3674 svoboda 179
    argc = cli_count_args(argv);
3420 post 180
 
3674 svoboda 181
    for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
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        c = getopt_long(argc, argv, "hvVfrb:", long_options, &opt_ind);
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        switch (c) {
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        case 'h':
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            help_cmd_cp(1);
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            return CMD_SUCCESS;
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        case 'v':
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            printf("%d\n", CP_VERSION);
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            return CMD_SUCCESS;
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        case 'V':
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            verbose = 1;
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            break;
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        case 'f':
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            break;
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        case 'r':
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            break;
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        case 'b':
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            if (-1 == (buffer = strtoint(optarg))) {
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                printf("%s: Invalid buffer specification, "
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                    "(should be a number greater than zero)\n",
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                    cmdname);
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                return CMD_FAILURE;
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            }
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            if (verbose)
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                printf("Buffer = %d\n", buffer);
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            break;
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        }
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    }
3420 post 209
 
3674 svoboda 210
    if (buffer == 0)
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        buffer = CP_DEFAULT_BUFLEN;
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213
    argc -= optind;
214
 
215
    if (argc != 2) {
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        printf("%s: invalid number of arguments. Try %s --help\n",
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            cmdname, cmdname);
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        return CMD_FAILURE;
3420 post 219
    }
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3674 svoboda 221
    ret = copy_file(argv[optind], argv[optind + 1], buffer, verbose);
3420 post 222
 
3674 svoboda 223
    if (verbose)
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        printf("%d bytes copied\n", ret);
225
 
226
    if (ret >= 0)
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        return CMD_SUCCESS;
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    else
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        return CMD_FAILURE;
3420 post 230
}
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