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 */ 33 34 #include "lint.h" 35 #include "file64.h" 36 #include "mtlib.h" 37 #include <sys/types.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <thread.h> 41 #include <synch.h> 42 #include "stdiom.h" 43 44 void 45 setbuf(FILE *iop, char *abuf) 46 { 47 Uchar *buf = (Uchar *)abuf; 48 int fno = _get_fd(iop); /* file number */ 49 int size = BUFSIZ - _SMBFSZ; 50 Uchar *temp; 51 rmutex_t *lk; 52 53 FLOCKFILE(lk, iop); 54 if ((iop->_base != NULL) && (iop->_flag & _IOMYBUF)) 55 free((char *)iop->_base - PUSHBACK); 56 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF); 57 if (buf == NULL) { 58 iop->_flag |= _IONBF; 59 if (fno == 0 || fno == 1) { 60 /* use special buffer for std{in,out} */ 61 buf = (fno == 0) ? _sibuf : _sobuf; 62 } else if (fno >= 2 && fno < _NFILE) { 63 buf = _smbuf[fno]; 64 size = _SMBFSZ - PUSHBACK; 65 } else if ((buf = (Uchar *)malloc(_SMBFSZ * 66 sizeof (Uchar))) != NULL) { 67 iop->_flag |= _IOMYBUF; 68 size = _SMBFSZ - PUSHBACK; 69 } 70 } else { /* regular buffered I/O, standard buffer size */ 71 if (fno != -1 && isatty(fno)) 72 iop->_flag |= _IOLBF; 73 } 74 if (buf == NULL) { 75 FUNLOCKFILE(lk); 76 return; /* malloc() failed */ 77 } 78 temp = buf + PUSHBACK; 79 iop->_base = temp; 80 _setbufend(iop, temp + size); 81 iop->_ptr = temp; 82 iop->_cnt = 0; 83 FUNLOCKFILE(lk); 84 } 85