10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * CDDL HEADER START
30Sstevel@tonic-gate *
40Sstevel@tonic-gate * The contents of this file are subject to the terms of the
50Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
60Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
70Sstevel@tonic-gate * with the License.
80Sstevel@tonic-gate *
90Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
100Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
110Sstevel@tonic-gate * See the License for the specific language governing permissions
120Sstevel@tonic-gate * and limitations under the License.
130Sstevel@tonic-gate *
140Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
150Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
160Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
170Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
180Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
190Sstevel@tonic-gate *
200Sstevel@tonic-gate * CDDL HEADER END
210Sstevel@tonic-gate */
220Sstevel@tonic-gate /*
230Sstevel@tonic-gate * Copyright 1986 Sun Microsystems, Inc. All rights reserved.
240Sstevel@tonic-gate * Use is subject to license terms.
250Sstevel@tonic-gate */
260Sstevel@tonic-gate
270Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */
280Sstevel@tonic-gate /* All Rights Reserved */
290Sstevel@tonic-gate
30*722Smuffin #pragma ident "%Z%%M% %I% %E% SMI"
310Sstevel@tonic-gate
320Sstevel@tonic-gate /*LINTLIBRARY*/
330Sstevel@tonic-gate /*
340Sstevel@tonic-gate * This version reads directly from the buffer rather than looping on getc.
350Sstevel@tonic-gate * Ptr args aren't checked for NULL because the program would be a
360Sstevel@tonic-gate * catastrophic mess anyway. Better to abort than just to return NULL.
370Sstevel@tonic-gate */
380Sstevel@tonic-gate #include <stdio.h>
390Sstevel@tonic-gate #include "stdiom.h"
40*722Smuffin #include <memory.h>
410Sstevel@tonic-gate
420Sstevel@tonic-gate #define MIN(x, y) (x < y ? x : y)
430Sstevel@tonic-gate
440Sstevel@tonic-gate extern int _filbuf();
450Sstevel@tonic-gate
460Sstevel@tonic-gate int
fread(char * ptr,int size,int count,FILE * iop)47*722Smuffin fread(char *ptr, int size, int count, FILE *iop)
480Sstevel@tonic-gate {
49*722Smuffin unsigned int nleft;
50*722Smuffin int n;
510Sstevel@tonic-gate
520Sstevel@tonic-gate if (size <= 0 || count <= 0) return 0;
530Sstevel@tonic-gate nleft = count * size;
540Sstevel@tonic-gate
550Sstevel@tonic-gate /* Put characters in the buffer */
560Sstevel@tonic-gate /* note that the meaning of n when just starting this loop is
570Sstevel@tonic-gate irrelevant. It is defined in the loop */
580Sstevel@tonic-gate for ( ; ; ) {
590Sstevel@tonic-gate if (iop->_cnt <= 0) { /* empty buffer */
600Sstevel@tonic-gate if (_filbuf(iop) == EOF)
610Sstevel@tonic-gate return (count - (nleft + size - 1)/size);
620Sstevel@tonic-gate iop->_ptr--;
630Sstevel@tonic-gate iop->_cnt++;
640Sstevel@tonic-gate }
650Sstevel@tonic-gate n = MIN(nleft, iop->_cnt);
660Sstevel@tonic-gate ptr = memcpy(ptr, (char *) iop->_ptr, n) + n;
670Sstevel@tonic-gate iop->_cnt -= n;
680Sstevel@tonic-gate iop->_ptr += n;
690Sstevel@tonic-gate _BUFSYNC(iop);
700Sstevel@tonic-gate if ((nleft -= n) == 0)
710Sstevel@tonic-gate return (count);
720Sstevel@tonic-gate }
730Sstevel@tonic-gate }
74