1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Copyright 2020 Robert Mustacchi 32 * Copyright 2022 OmniOS Community Edition (OmniOSce) Association. 33 */ 34 35 #include "lint.h" 36 #include "file64.h" 37 #include "mtlib.h" 38 #include <sys/types.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <thread.h> 43 #include <synch.h> 44 #include "stdiom.h" 45 46 void 47 setbuf(FILE *iop, char *abuf) 48 { 49 Uchar *buf = (Uchar *)abuf; 50 int fno = _get_fd(iop); /* file number */ 51 int size = BUFSIZ - _SMBFSZ; 52 Uchar *temp; 53 rmutex_t *lk; 54 55 FLOCKFILE(lk, iop); 56 if ((iop->_base != NULL) && (iop->_flag & _IOMYBUF)) 57 free((char *)iop->_base - PUSHBACK); 58 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF); 59 if (buf == NULL) { 60 iop->_flag |= _IONBF; 61 if (fno == 0 || fno == 1) { 62 /* use special buffer for std{in,out} */ 63 buf = (fno == 0) ? _sibuf : _sobuf; 64 } else if (fno >= 2 && fno < _NFILE) { 65 buf = _smbuf[fno]; 66 size = _SMBFSZ - PUSHBACK; 67 } else if ((buf = (Uchar *)malloc(_SMBFSZ * 68 sizeof (Uchar))) != NULL) { 69 iop->_flag |= _IOMYBUF; 70 size = _SMBFSZ - PUSHBACK; 71 } 72 } else { /* regular buffered I/O, standard buffer size */ 73 if (fno != -1) { 74 /* 75 * isatty(3C) will set errno as a side-effect of 76 * returning 0. Hide this from callers so that they do 77 * not see errno changing for no apparent reason. 78 */ 79 int err = errno; 80 if (isatty(fno) != 0) 81 iop->_flag |= _IOLBF; 82 errno = err; 83 } 84 } 85 if (buf == NULL) { 86 FUNLOCKFILE(lk); 87 return; /* malloc() failed */ 88 } 89 temp = buf + PUSHBACK; 90 iop->_base = temp; 91 _setbufend(iop, temp + size); 92 iop->_ptr = temp; 93 iop->_cnt = 0; 94 FUNLOCKFILE(lk); 95 } 96