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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */ 31 32 /*LINTLIBRARY*/ 33 #include <stdio.h> 34 35 extern void free(); 36 extern unsigned char (*_smbuf)[_SBFSIZ]; 37 extern char *malloc(); 38 extern void _getsmbuf(); 39 40 int 41 setvbuf(iop, buf, type, size) 42 register FILE *iop; 43 register char *buf; 44 register int type; 45 register int size; 46 { 47 register int fno = fileno(iop); /* file number */ 48 49 if(iop->_base != NULL && iop->_flag & _IOMYBUF) 50 free((char*)iop->_base); 51 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF); 52 switch (type) { 53 /*note that the flags are the same as the possible values for type*/ 54 case _IONBF: 55 /* file is unbuffered except in fastio */ 56 iop->_flag |= _IONBF; 57 /* use small buffers reserved for this */ 58 iop->_base = _smbuf[fno]; 59 iop->_bufsiz = _SBFSIZ; 60 break; 61 case _IOLBF: 62 case _IOFBF: 63 if (size < 0) 64 return -1; 65 iop->_flag |= type; 66 size = (size == 0) ? BUFSIZ : size; 67 /* 68 * need eight characters beyond bufend for stdio slop 69 */ 70 if (size <= 8) { 71 size = BUFSIZ; 72 buf = NULL; 73 } 74 if (buf == NULL) { 75 size += 8; 76 buf = malloc((unsigned)size); 77 iop->_flag |= _IOMYBUF; 78 } 79 iop->_base = (unsigned char *)buf; 80 iop->_bufsiz = size - 8; 81 break; 82 default: 83 return -1; 84 } 85 iop->_ptr = iop->_base; 86 iop->_cnt = 0; 87 return 0; 88 } 89