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 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 /* 43 * stdiom.h - shared guts of stdio therefore it doesn't need 44 * a surrounding #ifndef 45 */ 46 47 #ifndef _STDIOM_H 48 #define _STDIOM_H 49 50 typedef unsigned char Uchar; 51 52 #define MAXVAL (MAXINT - (MAXINT % BUFSIZ)) 53 54 /* 55 * The number of actual pushback characters is the value 56 * of PUSHBACK plus the first byte of the buffer. The FILE buffer must, 57 * for performance reasons, start on a word aligned boundry so the value 58 * of PUSHBACK should be a multiple of word. 59 * At least 4 bytes of PUSHBACK are needed. If sizeof(int) = 1 this breaks. 60 */ 61 62 #define PUSHBACK ((int)(((3 + sizeof (int) - 1) / sizeof (int)) * sizeof (int))) 63 64 /* minimum buffer size must be at least 8 or shared library will break */ 65 #define _SMBFSZ (((PUSHBACK + 4) < 8) ? 8 : (PUSHBACK + 4)) 66 67 extern Uchar *_bufendtab[]; 68 69 #if BUFSIZ == 1024 70 #define MULTIBFSZ(SZ) ((SZ) & ~0x3ff) 71 #elif BUFSIZ == 512 72 #define MULTIBFSZ(SZ) ((SZ) & ~0x1ff) 73 #else 74 #define MULTIBFSZ(SZ) ((SZ) - (SZ % BUFSIZ)) 75 #endif 76 77 #define _bufend(iop) _realbufend(iop) 78 #define setbufend(iop, end) _setbufend(iop, end) 79 80 /* 81 * Internal routines from _iob.c 82 */ 83 extern void _cleanup(void); 84 extern void _flushlbf(void); 85 extern FILE *_findiop(void); 86 extern Uchar *_realbufend(FILE *iop); 87 extern void _setbufend(FILE *iop, Uchar *end); 88 extern int _wrtchk(FILE *iop); 89 90 /* 91 * Internal routines from flush.c 92 */ 93 extern void _bufsync(FILE *iop, Uchar *bufend); 94 extern int _xflsbuf(FILE *iop); 95 96 /* 97 * Internal routines from _findbuf.c 98 */ 99 extern Uchar *_findbuf(FILE *iop); 100 101 /* 102 * The following macros improve performance of the stdio by reducing the 103 * number of calls to _bufsync and _wrtchk. _needsync checks whether 104 * or not _bufsync needs to be called. _WRTCHK has the same effect as 105 * _wrtchk, but often these functions have no effect, and in those cases 106 * the macros avoid the expense of calling the functions. 107 */ 108 109 #define _needsync(p, bufend) ((bufend - (p)->_ptr) < \ 110 ((p)->_cnt < 0 ? 0 : (p)->_cnt)) 111 112 #define _WRTCHK(iop) ((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) || \ 113 (iop->_base == 0) || \ 114 (iop->_ptr == iop->_base && iop->_cnt == 0 && \ 115 !(iop->_flag & (_IONBF | _IOLBF)))) \ 116 ? _wrtchk(iop) : 0) 117 #endif /* _STDIOM_H */ 118