pred_fileio.h

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/*  This file is part of OMCSNetCPP

    OMCSNetCPP is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.

    OMCSNetCPP 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with OMCSNetCPP; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _PRED_FILEIO

#define _PRED_FILEIO

#include <stdio.h>

#include <string>


class CPredicateFileIO
{
        public:
                bool OpenInputFile(const std::string &a_path)
                {
                        if (m_fp)
                        {
                                return false;
                        }

                        m_fp = fopen(a_path.c_str(), "rt");

                        if (m_fp)
                        {
                                return true;
                        }

                        return false;
                }

                bool CloseInputFile()
                {
                        if (m_fp)
                        {
                                fclose(m_fp);

                                m_fp = NULL;

                                return true;
                        }

                        return false;
                }

                std::string GetPredicate(bool *a_flag)
                {
                        if (m_fp)
                        {
                                std::string l_string;

                                if (true == p_GetLine(l_string))
                                {
                                        if (a_flag)
                                        {
                                                *a_flag = true;
                                        }

                                        return l_string;
                                }       
                        }

                        if (a_flag)
                        {
                                *a_flag = false;
                        }

                        return "";
                }

                CPredicateFileIO()
                {
                        m_fp = NULL;
                }

                ~CPredicateFileIO()
                {
                        CloseInputFile();
                }

        private:
                bool p_GetLine(std::string &a_string) const
                {
                        if (!m_fp)
                                return false;

                        while (!feof(m_fp))
                        {
                                char l_buffer[512];

                                l_buffer[0] = 0;

                                fgets(l_buffer, 512, m_fp);

                                if (strlen(l_buffer) > 0)
                                {
                                        int l_end = strlen(l_buffer);

                                        while (l_end > 0)
                                        {
                                                if (('\r' == l_buffer[l_end - 1]) ||
                                                    ('\n' == l_buffer[l_end - 1]))
                                                {
                                                        l_end--;
                                                }
                                                else break;
                                        }

                                        if ((l_end >  0) &&
                                            ('#'   != l_buffer[0]))
                                        {
                                                a_string.assign(l_buffer, l_end);

                                                return true;
                                        }
                                }
                        }

                        return false;
                }

                FILE *m_fp;
};

#endif

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