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

/* @(#)fread.c	4.3 (Berkeley) %G% */
#include	<stdio.h>

fread(ptr, size, count, iop)
	register char *ptr;
	unsigned size, count;
	register FILE *iop;
{
	register int s;
	int c;

	s = size * count;
	while (s > 0) {
		if (iop->_cnt < s) {
			if (iop->_cnt > 0) {
				bcopy(iop->_ptr, ptr, iop->_cnt);
				ptr += iop->_cnt;
				s -= iop->_cnt;
			}
			/*
			 * filbuf clobbers _cnt & _ptr,
			 * so don't waste time setting them.
			 */
			if ((c = _filbuf(iop)) == EOF)
				break;
			*ptr++ = c;
			s--;
		}
		if (iop->_cnt >= s) {
			bcopy(iop->_ptr, ptr, s);
			iop->_ptr += s;
			iop->_cnt -= s;
			return (count);
		}
	}
	return (size != 0 ? count - ((s + size - 1) / size) : 0);
}
Commit	Line	Data
a2dc047f	1	/* @(#)fread.c 4.3 (Berkeley) %G% */
637f6ac3 MK	2	#include <stdio.h>
	3
	4	fread(ptr, size, count, iop)
	5	register char *ptr;
	6	unsigned size, count;
	7	register FILE *iop;
	8	{
	9	register int s;
0bc83587	10	int c;
637f6ac3 MK	11
	12	s = size * count;
	13	while (s > 0) {
	14	if (iop->_cnt < s) {
	15	if (iop->_cnt > 0) {
	16	bcopy(iop->_ptr, ptr, iop->_cnt);
	17	ptr += iop->_cnt;
	18	s -= iop->_cnt;
	19	}
	20	/*
	21	* filbuf clobbers _cnt & _ptr,
	22	* so don't waste time setting them.
	23	*/
0bc83587	24	if ((c = _filbuf(iop)) == EOF)
637f6ac3	25	break;
0bc83587	26	*ptr++ = c;
637f6ac3 MK	27	s--;
	28	}
	29	if (iop->_cnt >= s) {
	30	bcopy(iop->_ptr, ptr, s);
	31	iop->_ptr += s;
	32	iop->_cnt -= s;
	33	return (count);
	34	}
	35	}
a2dc047f	36	return (size != 0 ? count - ((s + size - 1) / size) : 0);
637f6ac3	37	}