#include <stdio.h>
// non standard realization - no support for virtually change char
int ungetc(int c,FILE* file)
{
	dword res;

	if ((file->mode & 3!=FILE_OPEN_READ) && (file->mode & FILE_OPEN_PLUS==0)) return EOF;

	if (file->filepos>file->filesize || file->filepos==0)
	{
		return EOF;
	}
	file->filepos--;

	return c;
}