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 #ifdef _IO_MTSAFE_IO
  58 #define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  59   static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
  60   struct _IO_FILE_plus NAME \
  61     = {FILEBUF_LITERAL(CHAIN, FLAGS, FD), STD_VTABLE}
  62 #else
  63 #define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  64   struct _IO_FILE_plus NAME = {FILEBUF_LITERAL(CHAIN, FLAGS, FD), STD_VTABLE}
  65 #endif
  66
  67 DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES);
  68 DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_.file, _IO_NO_READS);
  69 DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_.file,
  70             _IO_NO_READS+_IO_UNBUFFERED);
  71
  72 #ifdef _STDIO_USES_IOSTREAM
  73 _IO_FILE *_IO_list_all = &_IO_stderr_.file;
  74 #else /* !_STDIO_USES_IOSTREAM */
  75 #include "stdiostream.h"
  76
  77 struct _IO_fake_stdiobuf {
  78   struct {
  79     _IO_FILE file;
  80     const void *vtable;
  81   } s;
  82   FILE *stdio_file;
  83 };
  84
  85 /* Define stdiobuf_vtable as a name for the virtual function table
  86    of the stdiobuf class. */
  87 #ifndef stdiobuf_vtable
  88 #ifdef __GNUC__
  89 extern struct _IO_jump_t stdiobuf_vtable
  90   asm (_G_VTABLE_LABEL_PREFIX
  91 #if _G_VTABLE_LABEL_HAS_LENGTH
  92        "8"
  93 #endif
  94        "stdiobuf");
  95 #else /* !__GNUC__ */
  96 #if _G_VTABLE_LABEL_HAS_LENGTH
  97 #define stdiobuf_vtable _G_VTABLE_LABEL_PREFIX_ID##8stdiobuf
  98 #else
  99 #define stdiobuf_vtable _G_VTABLE_LABEL_PREFIX_ID##stdiobuf
 100 #endif
 101 extern struct _IO_jump_t stdiobuf_vtable;
 102 #endif /* !__GNUC__ */
 103 #endif /* !stdiobuf_vtable */
 104
 105 #ifdef _IO_MTSAFE_IO
 106 #define DEF_STDIOFILE(NAME, FD, FILE, FLAGS, CHAIN) \
 107   static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
 108   struct _IO_fake_stdiobuf NAME = \
 109       {{{ _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+_IO_UNBUFFERED+FLAGS, \
 110          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 111          0, 0, 0, 0, { 0 }, _IO_stdfile_##FD##_lock},\
 112          &stdiobuf_vtable}, FILE}
 113 #else
 114 #define DEF_STDIOFILE(NAME, FD, FILE, FLAGS, CHAIN) \
 115   struct _IO_fake_stdiobuf NAME = \
 116       {{{ _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+_IO_UNBUFFERED+FLAGS, \
 117             0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD}, \
 118          &stdiobuf_vtable}, FILE}
 119 #endif
 120
 121 DEF_STDIOFILE(_IO_stdin_buf, 0, stdin, _IO_NO_WRITES, &_IO_stderr_.file);
 122 DEF_STDIOFILE(_IO_stdout_buf, 1, stdout, _IO_NO_READS, &_IO_stdin_buf.s.file);
 123 DEF_STDIOFILE(_IO_stderr_buf, 2, stderr, _IO_NO_READS, &_IO_stdout_buf.s.file);
 124
 125 _IO_FILE *_IO_list_all = &_IO_stderr_buf.s.file;
 126 #endif  /* !_STDIO_USES_IOSTREAM */