Replace tabs with spaces in C [on hold]

i want to replace tabs with spaces but i didn't get it. I also tried to count the chars but that did also not work for me.

I just want to do it in c, no c++.

Here's what i have so far:

void ReplaceTabs(FILE *file)
{
    int currChar = 0;

    if (file != NULL)
    {
        while((currChar = fgetc(file)) != EOF)
        {
            if(int currChar = 0 == '\\') 
            {
                currChar = fgetc(file);

                if(currChar == 't') // 
                {
                    // Here's where i stuck ...
                    printf("\t");
                }
                else
                {
                    putchar(92); // == \
                    putchar(currChar);
                }
            }
            else
            {
                putchar(currChar); // To print the chars
            }
        }
    }
    else
        printf("The file does not exists!");
}