[unix-history] / usr / src / lib / libc / stdio / ungetc.c

/*	ungetc.c	4.3	85/02/13	*/

#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)
		iop->_ptr++;

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

	return (c);
}
Commit	Line	Data
41e01b3e	1	/* ungetc.c 4.3 85/02/13 */
bec69c1e	2
52dc310d BJ	3	#include <stdio.h>
	4
	5	ungetc(c, iop)
bec69c1e	6	register FILE *iop;
52dc310d	7	{
41e01b3e S	8	if (c == EOF \|\| (iop->_flag & (_IOREAD\|_IORW)) == 0 \|\|
	9	iop->_ptr == NULL \|\| iop->_base == NULL)
	10	return (EOF);
	11
	12	if (iop->_ptr == iop->_base)
	13	iop->_ptr++;
	14
52dc310d BJ	15	iop->_cnt++;
52dc310d BJ	16	*--iop->_ptr = c;
41e01b3e	17
bec69c1e	18	return (c);
52dc310d	19	}