gl/stdio-impl.h

   1 /* Implementation details of FILE streams.
   2    Copyright (C) 2007-2008 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 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU 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 __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
  25
  26 # if defined __DragonFly__          /* DragonFly */
  27   /* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>.  */
  28 #  define fp_ ((struct { struct __FILE_public pub; \
  29                          struct { unsigned char *_base; int _size; } _bf; \
  30                          void *cookie; \
  31                          void *_close; \
  32                          void *_read; \
  33                          void *_seek; \
  34                          void *_write; \
  35                          struct { unsigned char *_base; int _size; } _ub; \
  36                          int _ur; \
  37                          unsigned char _ubuf[3]; \
  38                          unsigned char _nbuf[1]; \
  39                          struct { unsigned char *_base; int _size; } _lb; \
  40                          int _blksize; \
  41                          fpos_t _offset; \
  42                          /* More fields, not relevant here.  */ \
  43                        } *) fp)
  44   /* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>.  */
  45 #  define _p pub._p
  46 #  define _flags pub._flags
  47 #  define _r pub._r
  48 #  define _w pub._w
  49 # else
  50 #  define fp_ fp
  51 # endif
  52
  53 # if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
  54   /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
  55      and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
  56   struct __sfileext
  57     {
  58       struct  __sbuf _ub; /* ungetc buffer */
  59       /* More fields, not relevant here.  */
  60     };
  61 #  define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
  62 # else                                         /* FreeBSD, DragonFly, MacOS X, Cygwin */
  63 #  define fp_ub fp_->_ub
  64 # endif
  65
  66 # define HASUB(fp) (fp_ub._base != NULL)
  67
  68 #endif
  69
  70
  71 /* SystemV derived implementations.  */
  72
  73 #if defined _IOERR
  74
  75 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
  76 #  define fp_ ((struct { unsigned char *_ptr; \
  77                          unsigned char *_base; \
  78                          unsigned char *_end; \
  79                          long _cnt; \
  80                          int _file; \
  81                          unsigned int _flag; \
  82                        } *) fp)
  83 # else
  84 #  define fp_ fp
  85 # endif
  86
  87 # if defined _SCO_DS                /* OpenServer */
  88 #  define _cnt __cnt
  89 #  define _ptr __ptr
  90 #  define _base __base
  91 #  define _flag __flag
  92 # endif
  93
  94 #endif