/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1988 AT&T */ /* All Rights Reserved */ #pragma ident "%Z%%M% %I% %E% SMI" #define _LARGEFILE64_SOURCE 1 #include "synonyms.h" #include "file64.h" #include #include #include #include #include "stdiom.h" /* * If buffer space has been pre-allocated use it otherwise malloc space. * PUSHBACK causes the base pointer to be bumped forward. At least 4 bytes * of pushback are required to meet international specifications. * Extra space at the end of the buffer allows for synchronization problems. * If malloc() fails stdio bails out; assumption being the system is in trouble. * Associate a buffer with stream; return NULL on error. */ Uchar * _findbuf(FILE *iop) { int fd = GET_FD(iop); Uchar *buf; int size = BUFSIZ; Uchar *endbuf; int tty = -1; struct stat64 stbuf; /* used to get file system block size */ if (iop->_flag & _IONBF) /* need a small buffer, at least */ { trysmall:; size = _SMBFSZ - PUSHBACK; if (fd < _NFILE) buf = _smbuf[fd]; else if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != NULL) iop->_flag |= _IOMYBUF; } #ifndef _STDIO_ALLOCATE else if (fd < 2 && (tty = isatty(fd))) { buf = (fd == 0) ? _sibuf : _sobuf; /* special buffer */ /* for std{in,out} */ } #endif else { /* * The operating system can tell us the * right size for a buffer; * avoid 0-size buffers as returned for some * special files (doors) */ if (fstat64(fd, &stbuf) == 0 && stbuf.st_blksize > 0) size = stbuf.st_blksize; if ((buf = (Uchar *)malloc(sizeof (Uchar)*(size+_SMBFSZ))) != NULL) iop->_flag |= _IOMYBUF; else goto trysmall; } if (buf == NULL) return (NULL); /* malloc() failed */ iop->_base = buf + PUSHBACK; /* bytes for pushback */ iop->_ptr = buf + PUSHBACK; endbuf = iop->_base + size; _setbufend(iop, endbuf); if (!(iop->_flag & _IONBF) && ((tty != -1) ? tty : isatty(fd))) iop->_flag |= _IOLBF; return (endbuf); }