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BSD 4.3tahoe

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ungetc.c	5.3 (Berkeley) 3/26/86";
#endif LIBC_SCCS and not lint

#include <stdio.h>

ungetc(c, iop)
	register FILE *iop;
{
	if (c == EOF || (iop->_flag & (_IOREAD|_IORW)) == 0 ||
	    iop->_ptr == NULL || iop->_base == NULL)
		return (EOF);

	if (iop->_ptr == iop->_base)
		if (iop->_cnt == 0)
			iop->_ptr++;
		else
			return (EOF);

	iop->_cnt++;
	*--iop->_ptr = c;

	return (c);
}

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