usr/src/ucblib/libucb/inc/stdiom.h

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