libio/stdstrbufs.cc

   1 /*
   2 Copyright (C) 1994 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, 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 not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25
  26 /* This file provides definitions of _IO_stdin, _IO_stdout, and _IO_stderr
  27    for C++ code.  Compare stdfiles.c.
  28    (The difference is that here the vtable field is set to
  29    point to builtinbuf's vtable, so the objects are effectively
  30    of class builtinbuf.) */
  31
  32 #include "libioP.h"
  33 #include <stdio.h>
  34
  35 #if !defined(filebuf_vtable) && defined(__cplusplus)
  36 #ifdef __GNUC__
  37 extern char filebuf_vtable[]
  38   asm (_G_VTABLE_LABEL_PREFIX
  39 #if _G_VTABLE_LABEL_HAS_LENGTH
  40        "7"
  41 #endif
  42        "filebuf");
  43 #else /* !__GNUC__ */
  44 #if _G_VTABLE_LABEL_HAS_LENGTH
  45 #define filebuf_vtable _G_VTABLE_LABEL_PREFIX_ID##7filebuf
  46 #else
  47 #define filebuf_vtable _G_VTABLE_LABEL_PREFIX_ID##filebuf
  48 #endif
  49 extern char filebuf_vtable[];
  50 #endif /* !__GNUC__ */
  51 #endif /* !defined(filebuf_vtable) && defined(__cplusplus) */
  52
  53 #ifndef STD_VTABLE
  54 #define STD_VTABLE (const struct _IO_jump_t *)filebuf_vtable
  55 #endif
  56
  57 #define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  58   struct _IO_FILE_plus NAME = {FILEBUF_LITERAL(CHAIN, FLAGS, FD), STD_VTABLE}
  59
  60 DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES);
  61 DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_.file, _IO_NO_READS);
  62 DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_.file,
  63             _IO_NO_READS+_IO_UNBUFFERED);
  64
  65 #ifdef _STDIO_USES_IOSTREAM
  66 _IO_FILE *_IO_list_all = &_IO_stderr_.file;
  67 #else /* !_STDIO_USES_IOSTREAM */
  68 #include "stdiostream.h"
  69
  70 struct _IO_fake_stdiobuf {
  71   struct {
  72     _IO_FILE file;
  73     const void *vtable;
  74   } s;
  75   FILE *stdio_file;
  76 };
  77
  78 /* Define stdiobuf_vtable as a name for the virtual function table
  79    of the stdiobuf class. */
  80 #ifndef stdiobuf_vtable
  81 #ifdef __GNUC__
  82 extern struct _IO_jump_t stdiobuf_vtable
  83   asm (_G_VTABLE_LABEL_PREFIX
  84 #if _G_VTABLE_LABEL_HAS_LENGTH
  85        "8"
  86 #endif
  87        "stdiobuf");
  88 #else /* !__GNUC__ */
  89 #if _G_VTABLE_LABEL_HAS_LENGTH
  90 #define stdiobuf_vtable _G_VTABLE_LABEL_PREFIX_ID##8stdiobuf
  91 #else
  92 #define stdiobuf_vtable _G_VTABLE_LABEL_PREFIX_ID##stdiobuf
  93 #endif
  94 extern struct _IO_jump_t stdiobuf_vtable;
  95 #endif /* !__GNUC__ */
  96 #endif /* !stdiobuf_vtable */
  97
  98 #if  _IO_UNIFIED_JUMPTABLES
  99 #define JUMP_PTR /* Nothing */
 100 #else
 101 #define JUMP_PTR &_IO_streambuf_jumps,
 102 #endif
 103
 104 #define DEF_STDIOFILE(NAME, FD, FILE, FLAGS, CHAIN) \
 105   struct _IO_fake_stdiobuf NAME = \
 106       {{{ _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+_IO_UNBUFFERED+FLAGS, \
 107          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, JUMP_PTR FD},\
 108          &stdiobuf_vtable}, FILE}
 109
 110 DEF_STDIOFILE(_IO_stdin_buf, 0, stdin, _IO_NO_WRITES, &_IO_stderr_.file);
 111 DEF_STDIOFILE(_IO_stdout_buf, 1, stdout, _IO_NO_READS, &_IO_stdin_buf.s.file);
 112 DEF_STDIOFILE(_IO_stderr_buf, 2, stderr, _IO_NO_READS, &_IO_stdout_buf.s.file);
 113
 114 _IO_FILE *_IO_list_all = &_IO_stderr_buf.s.file;
 115 #endif  /* !_STDIO_USES_IOSTREAM */