Assembler/FileAccess.cpp at main · RyanGaraffa/Assembler · GitHub

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//
//  Implementation of file access class.
//
#include "stdafx.h"
#include "FileAccess.h"

/**/
/*
FileAccess()

NAME

        FileAccess() - Constructor that also opens file

SYNOPSIS

        FileAccess::FileAccess( int argc, char *argv[] )

            argc    --> input from command line. holds number of inputs read
            argv[]  --> input from command line. holds what was read in an array


DESCRIPTION

        This Constructor begins the process of reading the file by opening it

RETURNS

        Does not Return anything.

AUTHOR

        Victor Miller

DATE

        7:26pm 12/19/2021

*/
/**/

FileAccess::FileAccess( int argc, char *argv[] )
{
    // Check that there is exactly one run time parameter.
    if( argc != 2 ) {
        cerr << "Usage: Assem <FileName>" << endl;
        exit( 1 );
    }
    // Open the file.  One might question if this is the best place to open the file.
    // One might also question whether we need a file access class.
    m_sfile.open( argv[1], ios::in );

    // If the open failed, report the error and terminate.
    if( ! m_sfile ) {
        cerr << "Source file could not be opened, assembler terminated." << endl;
         exit( 1 );
    }
}
FileAccess::~FileAccess( )
{
    // Not that necessary in that the file will be closed when the program terminates, but good form.
    m_sfile.close( );
}

/**/
/*
GetNextLine()

NAME

        GetNextLine() - Gets the next line from file

SYNOPSIS

        bool FileAccess::GetNextLine( string &a_line );

            a_line	--> a string holding the line, will input current line and set it to next line


DESCRIPTION

        This function will set a_line to the next line in the file

RETURNS

        Returns false if it cannot get the next line
        Returns true if successfully gets next line

AUTHOR

        Victor Miller

DATE

        7:26pm 12/19/2021

*/
/**/

bool FileAccess::GetNextLine( string &a_line )
{
    // If there is no more data, return false.
    if( m_sfile.eof() ) {

        return false;
    }
    getline( m_sfile, a_line );

    // Return indicating success.
    return true;
}

/**/
/*
rewind( )

NAME

        rewind( ) - rewinds to top of file

SYNOPSIS

        void FileAccess::rewind( );

DESCRIPTION

        This function will bring allow us to read from the top of a file again

RETURNS

        Returns void

AUTHOR

        Victor Miller

DATE

        7:26pm 12/19/2021

*/
/**/

// Clean all file flags and go back to the beginning of the file.
void FileAccess::rewind( )
{
    m_sfile.clear();
    m_sfile.seekg( 0, ios::beg );
}