libio/strfile.h

   1 /* Copyright (C) 1993,1997,1998,1999,2005,2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.
  18
  19    As a special exception, if you link the code in this file with
  20    files compiled with a GNU compiler to produce an executable,
  21    that does not cause the resulting executable to be covered by
  22    the GNU Lesser General Public License.  This exception does not
  23    however invalidate any other reasons why the executable file
  24    might be covered by the GNU Lesser General Public License.
  25    This exception applies to code released by its copyright holders
  26    in files containing the exception.  */
  27
  28 #include <libio.h>
  29 #ifdef TODO
  30 Merge into  libio.h ?
  31 #endif
  32
  33 typedef void *(*_IO_alloc_type) (_IO_size_t);
  34 typedef void (*_IO_free_type) (void*);
  35
  36 struct _IO_str_fields
  37 {
  38   _IO_alloc_type _allocate_buffer;
  39   _IO_free_type _free_buffer;
  40 };
  41
  42 /* This is needed for the Irix6 N32 ABI, which has a 64 bit off_t type,
  43    but a 32 bit pointer type.  In this case, we get 4 bytes of padding
  44    after the vtable pointer.  Putting them in a structure together solves
  45    this problem.  */
  46
  47 struct _IO_streambuf
  48 {
  49   struct _IO_FILE _f;
  50   const struct _IO_jump_t *vtable;
  51 };
  52
  53 typedef struct _IO_strfile_
  54 {
  55   struct _IO_streambuf _sbf;
  56   struct _IO_str_fields _s;
  57 } _IO_strfile;
  58
  59 /* dynamic: set when the array object is allocated (or reallocated)  as
  60    necessary to hold a character sequence that can change in length. */
  61 #define _IO_STR_DYNAMIC(FP) ((FP)->_s._allocate_buffer != (_IO_alloc_type)0)
  62
  63 /* frozen: set when the program has requested that the array object not
  64    be altered, reallocated, or freed. */
  65 #define _IO_STR_FROZEN(FP) ((FP)->_f._IO_file_flags & _IO_USER_BUF)
  66
  67 typedef struct
  68 {
  69   _IO_strfile f;
  70   /* This is used for the characters which do not fit in the buffer
  71      provided by the user.  */
  72   char overflow_buf[64];
  73 } _IO_strnfile;
  74
  75 extern const struct _IO_jump_t _IO_strn_jumps attribute_hidden;
  76
  77
  78 typedef struct
  79 {
  80   _IO_strfile f;
  81   /* This is used for the characters which do not fit in the buffer
  82      provided by the user.  */
  83   wchar_t overflow_buf[64];
  84 } _IO_wstrnfile;
  85
  86 extern const struct _IO_jump_t _IO_wstrn_jumps attribute_hidden;