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 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