1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */ 28*0Sstevel@tonic-gate /* All Rights Reserved */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 3.11 */ 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate /*LINTLIBRARY*/ 33*0Sstevel@tonic-gate /* 34*0Sstevel@tonic-gate * This version reads directly from the buffer rather than looping on getc. 35*0Sstevel@tonic-gate * Ptr args aren't checked for NULL because the program would be a 36*0Sstevel@tonic-gate * catastrophic mess anyway. Better to abort than just to return NULL. 37*0Sstevel@tonic-gate */ 38*0Sstevel@tonic-gate #include <stdio.h> 39*0Sstevel@tonic-gate #include "stdiom.h" 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #define MIN(x, y) (x < y ? x : y) 42*0Sstevel@tonic-gate 43*0Sstevel@tonic-gate extern int _filbuf(); 44*0Sstevel@tonic-gate extern _bufsync(); 45*0Sstevel@tonic-gate extern char *memcpy(); 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate int 48*0Sstevel@tonic-gate fread(ptr, size, count, iop) 49*0Sstevel@tonic-gate char *ptr; 50*0Sstevel@tonic-gate int size, count; 51*0Sstevel@tonic-gate register FILE *iop; 52*0Sstevel@tonic-gate { 53*0Sstevel@tonic-gate register unsigned int nleft; 54*0Sstevel@tonic-gate register int n; 55*0Sstevel@tonic-gate 56*0Sstevel@tonic-gate if (size <= 0 || count <= 0) return 0; 57*0Sstevel@tonic-gate nleft = count * size; 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate /* Put characters in the buffer */ 60*0Sstevel@tonic-gate /* note that the meaning of n when just starting this loop is 61*0Sstevel@tonic-gate irrelevant. It is defined in the loop */ 62*0Sstevel@tonic-gate for ( ; ; ) { 63*0Sstevel@tonic-gate if (iop->_cnt <= 0) { /* empty buffer */ 64*0Sstevel@tonic-gate if (_filbuf(iop) == EOF) 65*0Sstevel@tonic-gate return (count - (nleft + size - 1)/size); 66*0Sstevel@tonic-gate iop->_ptr--; 67*0Sstevel@tonic-gate iop->_cnt++; 68*0Sstevel@tonic-gate } 69*0Sstevel@tonic-gate n = MIN(nleft, iop->_cnt); 70*0Sstevel@tonic-gate ptr = memcpy(ptr, (char *) iop->_ptr, n) + n; 71*0Sstevel@tonic-gate iop->_cnt -= n; 72*0Sstevel@tonic-gate iop->_ptr += n; 73*0Sstevel@tonic-gate _BUFSYNC(iop); 74*0Sstevel@tonic-gate if ((nleft -= n) == 0) 75*0Sstevel@tonic-gate return (count); 76*0Sstevel@tonic-gate } 77*0Sstevel@tonic-gate } 78