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 51846Scraigm * Common Development and Distribution License (the "License"). 61846Scraigm * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 211846Scraigm 220Sstevel@tonic-gate /* 23*6812Sraf * Copyright 2008 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) 1988 AT&T */ 280Sstevel@tonic-gate /* All Rights Reserved */ 290Sstevel@tonic-gate 301846Scraigm #pragma ident "%Z%%M% %I% %E% SMI" 311846Scraigm 320Sstevel@tonic-gate 330Sstevel@tonic-gate #define _LARGEFILE64_SOURCE 1 340Sstevel@tonic-gate 35*6812Sraf #include "lint.h" 360Sstevel@tonic-gate #include "file64.h" 370Sstevel@tonic-gate #include <stdlib.h> 380Sstevel@tonic-gate #include <stdio.h> 390Sstevel@tonic-gate #include <sys/types.h> 400Sstevel@tonic-gate #include <sys/stat.h> 410Sstevel@tonic-gate #include "stdiom.h" 420Sstevel@tonic-gate 430Sstevel@tonic-gate /* 440Sstevel@tonic-gate * If buffer space has been pre-allocated use it otherwise malloc space. 450Sstevel@tonic-gate * PUSHBACK causes the base pointer to be bumped forward. At least 4 bytes 460Sstevel@tonic-gate * of pushback are required to meet international specifications. 470Sstevel@tonic-gate * Extra space at the end of the buffer allows for synchronization problems. 480Sstevel@tonic-gate * If malloc() fails stdio bails out; assumption being the system is in trouble. 490Sstevel@tonic-gate * Associate a buffer with stream; return NULL on error. 500Sstevel@tonic-gate */ 510Sstevel@tonic-gate Uchar * _findbuf(FILE * iop)520Sstevel@tonic-gate_findbuf(FILE *iop) 530Sstevel@tonic-gate { 541846Scraigm int fd = GET_FD(iop); 550Sstevel@tonic-gate Uchar *buf; 560Sstevel@tonic-gate int size = BUFSIZ; 570Sstevel@tonic-gate Uchar *endbuf; 580Sstevel@tonic-gate int tty = -1; 590Sstevel@tonic-gate 600Sstevel@tonic-gate struct stat64 stbuf; /* used to get file system block size */ 610Sstevel@tonic-gate 620Sstevel@tonic-gate if (iop->_flag & _IONBF) /* need a small buffer, at least */ 630Sstevel@tonic-gate { 640Sstevel@tonic-gate trysmall:; 650Sstevel@tonic-gate size = _SMBFSZ - PUSHBACK; 660Sstevel@tonic-gate if (fd < _NFILE) 670Sstevel@tonic-gate buf = _smbuf[fd]; 680Sstevel@tonic-gate else if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != 690Sstevel@tonic-gate NULL) 700Sstevel@tonic-gate iop->_flag |= _IOMYBUF; 710Sstevel@tonic-gate } 720Sstevel@tonic-gate #ifndef _STDIO_ALLOCATE 730Sstevel@tonic-gate else if (fd < 2 && (tty = isatty(fd))) { 740Sstevel@tonic-gate buf = (fd == 0) ? _sibuf : _sobuf; /* special buffer */ 750Sstevel@tonic-gate /* for std{in,out} */ 760Sstevel@tonic-gate } 770Sstevel@tonic-gate #endif 780Sstevel@tonic-gate else { 790Sstevel@tonic-gate /* 800Sstevel@tonic-gate * The operating system can tell us the 810Sstevel@tonic-gate * right size for a buffer; 820Sstevel@tonic-gate * avoid 0-size buffers as returned for some 830Sstevel@tonic-gate * special files (doors) 840Sstevel@tonic-gate */ 850Sstevel@tonic-gate if (fstat64(fd, &stbuf) == 0 && stbuf.st_blksize > 0) 860Sstevel@tonic-gate size = stbuf.st_blksize; 870Sstevel@tonic-gate 880Sstevel@tonic-gate if ((buf = (Uchar *)malloc(sizeof (Uchar)*(size+_SMBFSZ))) != 890Sstevel@tonic-gate NULL) 900Sstevel@tonic-gate iop->_flag |= _IOMYBUF; 910Sstevel@tonic-gate else 920Sstevel@tonic-gate goto trysmall; 930Sstevel@tonic-gate } 940Sstevel@tonic-gate if (buf == NULL) 950Sstevel@tonic-gate return (NULL); /* malloc() failed */ 960Sstevel@tonic-gate iop->_base = buf + PUSHBACK; /* bytes for pushback */ 970Sstevel@tonic-gate iop->_ptr = buf + PUSHBACK; 980Sstevel@tonic-gate endbuf = iop->_base + size; 990Sstevel@tonic-gate _setbufend(iop, endbuf); 1000Sstevel@tonic-gate if (!(iop->_flag & _IONBF) && ((tty != -1) ? tty : isatty(fd))) 1010Sstevel@tonic-gate iop->_flag |= _IOLBF; 1020Sstevel@tonic-gate return (endbuf); 1030Sstevel@tonic-gate } 104