libio/strfile.h

   1 /* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, USA.
  18
  19    As a special exception, if you link this library with files
  20    compiled with a GNU compiler to produce an executable, this does
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 #include <libio.h>
  27 #ifdef TODO
  28 Merge into  libio.h ?
  29 #endif
  30
  31 typedef void *(*_IO_alloc_type) __P ((_IO_size_t));
  32 typedef void (*_IO_free_type) __P ((void*));
  33
  34 struct _IO_str_fields
  35 {
  36   _IO_alloc_type _allocate_buffer;
  37   _IO_free_type _free_buffer;
  38 };
  39
  40 /* This is needed for the Irix6 N32 ABI, which has a 64 bit off_t type,
  41    but a 32 bit pointer type.  In this case, we get 4 bytes of padding
  42    after the vtable pointer.  Putting them in a structure together solves
  43    this problem.  */
  44
  45 struct _IO_streambuf
  46 {
  47   struct _IO_FILE _f;
  48   const void *_vtable;
  49 };
  50
  51 typedef struct _IO_strfile_
  52 {
  53   struct _IO_streambuf _sbf;
  54   struct _IO_str_fields _s;
  55 } _IO_strfile;
  56
  57 /* dynamic: set when the array object is allocated (or reallocated)  as
  58    necessary to hold a character sequence that can change in length. */
  59 #define _IO_STR_DYNAMIC(FP) ((FP)->_s._allocate_buffer != (_IO_alloc_type)0)
  60
  61 /* frozen: set when the program has requested that the array object not
  62    be altered, reallocated, or freed. */
  63 #define _IO_STR_FROZEN(FP) ((FP)->_f._IO_file_flags & _IO_USER_BUF)