// Use this tool at your own risk.
//
// The program is provided as is without any guarantees
// or warranty. Although I have attempted to find
// and correct any bugs in it, I am not responsible for
// any damage or losses of any kind caused by the use
// or misuse of the program.

#include "stdafx.h"
#include <windows.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>

int hitMe(int retval);
int hitMe(int retval)
{
    printf(retval == 0 ? "Press any key to release the file.\\n" : "Press any key to continue.\\n");
    _getch();
    return retval;
}

//int _tmain(int argc, _TCHAR* argv[])
int main(int argc, char * argv[])
{
    if(argc < 2)
    {
        printf("No file given.\\n");
        return hitMe(1);
    }

    FILE *f;
    char *fileName = argv[1];

    int fileNameLen = strlen(fileName);

    if(fileNameLen < 4)
    {
        printf("Given file '%s' is too short.\\n", fileName);
        return hitMe(1);
    }

    if(strcmp(fileName + fileNameLen - 4, ".sln") == 0)
    {
        // We leak this in the end, but do not care about it just now.
        fileName = new char[fileNameLen + 1];
        strncpy_s(fileName, fileNameLen + 1, argv[1], fileNameLen - 3);
        strcpy_s(fileName + fileNameLen - 3, 4, "ncb");
    }

    if(strcmp(fileName + fileNameLen - 4, ".ncb") != 0)
    {
        printf("Given file '%s' is neither an SLN nor an NCB.\\n", fileName);
        return hitMe(1);
    }

    errno_t e = fopen_s(&f, fileName, "w+"); // watch out, this will remove the file's content!

    printf("Locking file '%s' (open + delete content).\\n", fileName);

    if(e != 0)
    {
        printf("Watch out; fopen returned error %d.\\n", e);
        return hitMe(1);
    }

    hitMe(0);

    printf("Releasing file '%s' (close).\\n", fileName);

    if(f)
        fclose(f);

    return 0;
}