question3

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <string.h>

#define BUFFERSIZE 512

/*
*  Program Arguments:
*  program.exe [textCopy|binaryCopy] file.src file.dst
*/

void copy(char* method, char* src, char* dst);
int copyTextFile(char* src, char* dst);
int copyBinaryFile(char* src, char* dst);
int fileExists(char* filename);

int main(int argc, char** argv)
{
    if (argc == 4) // check for 4 args
    {
        /*
        * argv[0] = programName
        * argv[1] = textCopy/binaryCopy/..
        * argv[2] = file.src
        * argv[3] = file.dst
        */

        if (fileExists(argv[2])) // Check if file.src exists
        {
            if (fileExists(argv[3])) // Chec if file.dst already exists (overwrite request)
            {
                int overwrite = 0;

                printf("Do you want to overwrite? 0 (no) / 1 (yes)\n");
                scanf("%d", &overwrite);
                getchar();

                if (overwrite)
                {
                    copy(argv[1], argv[2], argv[3]);
                }
            }
            else
            {
                copy(argv[1], argv[2], argv[3]);
            }
        }
        else
        {
            printf("%s file does not exist\n", argv[2]);
        }
    }
    else
    {
        printf("Invalid execution\n"
            "Usage: copyFile (textCopy|binaryCopy) <sourceFilename_filename> <destFilenameination_filename>\n");
    }
}
/// <summary>
/// Checks if the given file already exists
/// </summary>
/// <param name="filename">File to check if he exists</param>
/// <returns>1 - If exists, 0 - If not exists</returns>
int fileExists(char* filename)
{
    FILE* file = NULL;

    if (file = fopen(filename, "r"))
    {
        fclose(file);
        return 1;
    }

    return 0;
}
/// <summary>
/// Copys SRC file to DST file
/// </summary>
/// <param name="src">Source file</param>
/// <param name="dst">Destination</param>
/// <returns>1 - if success, 0 - if something went wrong..</returns>
int copyTextFile(char* src, char* dst)
{
    FILE* srcFile = NULL;
    FILE* dstFile = NULL;
    char ch = ' ';

    srcFile = fopen(src, "r");
    if (srcFile == NULL)
    {
        printf("[ERROR] Can't open %s file.", src);

        return 0;
    }

    dstFile = fopen(dst, "w");
    if (dstFile == NULL)
    {
        fclose(srcFile);
        printf("[ERROR] Can't open %s file", dst);

        return 0;
    }

    while ((ch = fgetc(srcFile)) != EOF)
    {
        fputc(ch, dstFile);
    }

    fclose(srcFile);
    fclose(dstFile);

    return 1;
}
/// <summary>
/// Copys SRC file to DST file
/// </summary>
/// <param name="src">Source file</param>
/// <param name="dst">D</param>
/// <returns></returns>
int copyBinaryFile(char* src, char* dst)
{
    char buffer[BUFFERSIZE] = { 0 };
    FILE* srcFile = NULL;
    FILE* dstFile = NULL;
    size_t bytes = 0;

    srcFile = fopen(src, "rb");
    if (srcFile == NULL)
    {
        printf("[ERROR] Can't open %s file.", src);

        return 0;
    }

    dstFile = fopen(dst, "wb");
    if (dstFile == NULL)
    {
        fclose(srcFile);
        printf("[ERROR] Can't open %s file", dst);

        return 0;
    }

    while ((bytes = fread(buffer, 1, BUFFERSIZE, srcFile)) != 0) {
        if (fwrite(buffer, 1, bytes, dstFile) != bytes) {

            return 0;
        }
    }

    fclose(srcFile);
    fclose(dstFile);

    return 1;
}
/// <summary>
/// Choosing the method to copy the given files
/// </summary>
/// <param name="method">Binary Copy / Text Copy</param>
/// <param name="src">Source file</param>
/// <param name="dst">Destination File</param>
void copy(char* method, char* src, char* dst)
{
    if (!strcmp(method, "textCopy"))
    {
        if (copyTextFile(src, dst))
        {
            printf("Copy completed");
        }
    }
    else if (!strcmp(method, "binaryCopy"))
    {
        if (copyBinaryFile(src, dst))
        {
            printf("Copy completed");
        }
    }
    else
    {
        printf("Invalid execution\n"
            "Usage: copyFile (textCopy|binaryCopy) <sourceFilename_filename> <destFilenameination_filename>\n");
    }
}