/* from dlibs */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int fungetc(c, fp)
	int c;
	register FILE *fp;
	{
	if((fp->_flag & (_IOERR | _IOEOF))	/* error or eof */
	|| (fp->_ptr <= fp->_base)		/* or too many ungets */
	|| (c < 0))				/* or trying to unget EOF */
		return(EOF);
	++(fp->_cnt);
	return(*--(fp->_ptr) = c);
	}