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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include "synonyms.h" 34 #include "file64.h" 35 #include "mtlib.h" 36 #include <sys/types.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <thread.h> 40 #include <synch.h> 41 #include "stdiom.h" 42 43 int 44 setvbuf(FILE *iop, char *abuf, int type, size_t size) 45 { 46 47 Uchar *buf = (Uchar *)abuf; 48 Uchar *temp; 49 int sflag = iop->_flag & _IOMYBUF; 50 rmutex_t *lk; 51 52 FLOCKFILE(lk, iop); 53 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF); 54 switch (type) { 55 /* note that the flags are the same as the possible values for type */ 56 case _IONBF: 57 iop->_flag |= _IONBF; /* file is unbuffered */ 58 #ifndef _STDIO_ALLOCATE 59 if (iop->_file < 2) { 60 /* use special buffer for std{in,out} */ 61 buf = (iop->_file == 0) ? _sibuf : _sobuf; 62 size = BUFSIZ; 63 } else /* needed for ifdef */ 64 #endif 65 if (iop->_file < _NFILE) { 66 buf = _smbuf[iop->_file]; 67 size = _SMBFSZ - PUSHBACK; 68 } else 69 if ((buf = malloc(_SMBFSZ * sizeof (Uchar))) != NULL) { 70 iop->_flag |= _IOMYBUF; 71 size = _SMBFSZ - PUSHBACK; 72 } else { 73 FUNLOCKFILE(lk); 74 return (EOF); 75 } 76 break; 77 case _IOLBF: 78 case _IOFBF: 79 iop->_flag |= type; /* buffer file */ 80 /* 81 * need at least an 8 character buffer for 82 * out_of_sync concerns. 83 */ 84 if (size <= _SMBFSZ) { 85 size = BUFSIZ; 86 buf = NULL; 87 } 88 if (buf == NULL) { 89 if ((buf = malloc(sizeof (Uchar) * 90 (size + _SMBFSZ))) != NULL) 91 iop->_flag |= _IOMYBUF; 92 else { 93 FUNLOCKFILE(lk); 94 return (EOF); 95 } 96 } 97 else 98 size -= _SMBFSZ; 99 break; 100 default: 101 FUNLOCKFILE(lk); 102 return (EOF); 103 } 104 if (iop->_base != NULL && sflag) 105 free((char *)iop->_base - PUSHBACK); 106 temp = buf + PUSHBACK; 107 iop->_base = temp; 108 _setbufend(iop, temp + size); 109 iop->_ptr = temp; 110 iop->_cnt = 0; 111 FUNLOCKFILE(lk); 112 return (0); 113 } 114