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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * University Copyright- Copyright (c) 1982, 1986, 1988 31 * The Regents of the University of California 32 * All Rights Reserved 33 * 34 * University Acknowledgment- Portions of this document are derived from 35 * software developed by the University of California, Berkeley, and its 36 * contributors. 37 */ 38 39 /* 40 * stdiom.h - shared guts of stdio therefore it doesn't need 41 * a surrounding #ifndef 42 */ 43 44 #ifndef _STDIOM_H 45 #define _STDIOM_H 46 47 typedef unsigned char Uchar; 48 49 #define MAXVAL (MAXINT - (MAXINT % BUFSIZ)) 50 51 /* 52 * The number of actual pushback characters is the value 53 * of PUSHBACK plus the first byte of the buffer. The FILE buffer must, 54 * for performance reasons, start on a word aligned boundry so the value 55 * of PUSHBACK should be a multiple of word. 56 * At least 4 bytes of PUSHBACK are needed. If sizeof(int) = 1 this breaks. 57 */ 58 59 #define PUSHBACK ((int)(((3 + sizeof (int) - 1) / sizeof (int)) * sizeof (int))) 60 61 /* minimum buffer size must be at least 8 or shared library will break */ 62 #define _SMBFSZ (((PUSHBACK + 4) < 8) ? 8 : (PUSHBACK + 4)) 63 64 extern Uchar *_bufendtab[]; 65 66 #if BUFSIZ == 1024 67 #define MULTIBFSZ(SZ) ((SZ) & ~0x3ff) 68 #elif BUFSIZ == 512 69 #define MULTIBFSZ(SZ) ((SZ) & ~0x1ff) 70 #else 71 #define MULTIBFSZ(SZ) ((SZ) - (SZ % BUFSIZ)) 72 #endif 73 74 #define _bufend(iop) _realbufend(iop) 75 #define setbufend(iop, end) _setbufend(iop, end) 76 77 /* 78 * Internal routines from _iob.c 79 */ 80 extern void _cleanup(void); 81 extern void _flushlbf(void); 82 extern FILE *_findiop(void); 83 extern Uchar *_realbufend(FILE *iop); 84 extern void _setbufend(FILE *iop, Uchar *end); 85 extern int _wrtchk(FILE *iop); 86 87 /* 88 * Internal routines from flush.c 89 */ 90 extern void _bufsync(FILE *iop, Uchar *bufend); 91 extern int _xflsbuf(FILE *iop); 92 93 /* 94 * Internal routines from _findbuf.c 95 */ 96 extern Uchar *_findbuf(FILE *iop); 97 98 #ifndef _LP64 99 extern int _file_set(FILE *, int, const char *); 100 #define SET_FILE(iop, fd) (iop)->_magic = (fd); (iop)->__extendedfd = 0 101 #define _FILE_FD_MAX 255 102 #endif 103 104 /* 105 * The following macros improve performance of the stdio by reducing the 106 * number of calls to _bufsync and _wrtchk. _needsync checks whether 107 * or not _bufsync needs to be called. _WRTCHK has the same effect as 108 * _wrtchk, but often these functions have no effect, and in those cases 109 * the macros avoid the expense of calling the functions. 110 */ 111 112 #define _needsync(p, bufend) ((bufend - (p)->_ptr) < \ 113 ((p)->_cnt < 0 ? 0 : (p)->_cnt)) 114 115 #define _WRTCHK(iop) ((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) || \ 116 (iop->_base == 0) || \ 117 (iop->_ptr == iop->_base && iop->_cnt == 0 && \ 118 !(iop->_flag & (_IONBF | _IOLBF)))) \ 119 ? _wrtchk(iop) : 0) 120 #endif /* _STDIOM_H */ 121