WriteCommand.cpp

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/*
 * Copyright (C) 2009 Niek Linnenbank
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <String.h>
#include <Log.h>
#include "WriteCommand.h"
 
WriteCommand::WriteCommand()
    : ShellCommand("write", 2)
{
    m_help = "Write data to a file";
}
 
int WriteCommand::execute(const Size nparams, const char **params)
{
    int fd;
    String buf;
    
    // Attempt to open the file first
    if ((fd = open(params[0], O_WRONLY)) < 0)
    {
        ERROR("failed to open `" << params[0] << "': " << strerror(errno));
        return EXIT_FAILURE;
    }
    // Fill write buffer
    for (Size i = 1; i < nparams; i++)
    {
        buf << params[i];
        buf << " ";
    }
    // Append newline
    buf << "\n";
 
    // Write buffer to the file
    if (write(fd, *buf, buf.length()) < 0)
    {
        ERROR("failed to write `" << params[0] << "': " << strerror(errno));
        return EXIT_FAILURE;
    }
 
    // Close the file
    close(fd);
    return 0;
}