lib/stdio-impl.h

   1 /* Implementation details of FILE streams.
   2    Copyright (C) 2007-2008, 2010-2011 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Many stdio implementations have the same logic and therefore can share
  18    the same implementation of stdio extension API, except that some fields
  19    have different naming conventions, or their access requires some casts.  */
  20
  21
  22 /* BSD stdio derived implementations.  */
  23
  24 #if defined __NetBSD__                         /* NetBSD */
  25 /* Get __NetBSD_Version__.  */
  26 # include <sys/param.h>
  27 #endif
  28
  29 #if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
  30
  31 # if defined __DragonFly__          /* DragonFly */
  32   /* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>.  */
  33 #  define fp_ ((struct { struct __FILE_public pub; \
  34                          struct { unsigned char *_base; int _size; } _bf; \
  35                          void *cookie; \
  36                          void *_close; \
  37                          void *_read; \
  38                          void *_seek; \
  39                          void *_write; \
  40                          struct { unsigned char *_base; int _size; } _ub; \
  41                          int _ur; \
  42                          unsigned char _ubuf[3]; \
  43                          unsigned char _nbuf[1]; \
  44                          struct { unsigned char *_base; int _size; } _lb; \
  45                          int _blksize; \
  46                          fpos_t _offset; \
  47                          /* More fields, not relevant here.  */ \
  48                        } *) fp)
  49   /* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>.  */
  50 #  define _p pub._p
  51 #  define _flags pub._flags
  52 #  define _r pub._r
  53 #  define _w pub._w
  54 # else
  55 #  define fp_ fp
  56 # endif
  57
  58 # if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */
  59   /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
  60      and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
  61   struct __sfileext
  62     {
  63       struct  __sbuf _ub; /* ungetc buffer */
  64       /* More fields, not relevant here.  */
  65     };
  66 #  define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
  67 # else                                         /* FreeBSD, NetBSD <= 1.5Z, DragonFly, MacOS X, Cygwin */
  68 #  define fp_ub fp_->_ub
  69 # endif
  70
  71 # define HASUB(fp) (fp_ub._base != NULL)
  72
  73 #endif
  74
  75
  76 /* SystemV derived implementations.  */
  77
  78 #ifdef __TANDEM                     /* NonStop Kernel */
  79 # ifndef _IOERR
  80 /* These values were determined by the program 'stdioext-flags' at
  81    <http://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00165.html>.  */
  82 #  define _IOERR   0x40
  83 #  define _IOREAD  0x80
  84 #  define _IOWRT    0x4
  85 #  define _IORW   0x100
  86 # endif
  87 #endif
  88
  89 #if defined _IOERR
  90
  91 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
  92 #  define fp_ ((struct { unsigned char *_ptr; \
  93                          unsigned char *_base; \
  94                          unsigned char *_end; \
  95                          long _cnt; \
  96                          int _file; \
  97                          unsigned int _flag; \
  98                        } *) fp)
  99 # else
 100 #  define fp_ fp
 101 # endif
 102
 103 # if defined _SCO_DS                /* OpenServer */
 104 #  define _cnt __cnt
 105 #  define _ptr __ptr
 106 #  define _base __base
 107 #  define _flag __flag
 108 # endif
 109
 110 #endif