how to make getc() on stdin be binary

how to make getc() on stdin be binary

I'm using a while loop with getc() to read from a file handle and it works
fine. Now I'm adding support for pipes.
My problem is that while x0A, X0D, and x0A0D pass just fine, any cases of
x0D0A get reduced to just x0A. Also x1A seems to stop the process entirely
when encountered.
I'm piping in the output of tar, and is messing the files up.
FILE *FH;
FH=stdin;
char buff;
while((buff=getc(FH))!=EOF) {
//stuff
}
That's simplified, as FH needs to point to either a file or stdin. For
testing I'm just writing the buff out to a file to see the changes. The
code works perfectly if FH is a file.
I've seen the same behavior on using tar, type, and cat as the pipe source